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2018-01-01 | In order to alleviate the effect of the grid voltage on the grid current, Chap. 6 presented the full-feedforward scheme of grid voltages for the single-phase LCL -type grid-connected inverters, and the harmonics of the injected grid current are effectively suppressed. In this chapter, the full-feedforward scheme is ext... | Full-Feedforward Scheme of Grid Voltages for Three-Phase LCL-Type Grid-Connected Inverters | 10.1007/978-981-10-4277-5_7 |
2018-01-01 | This chapter describes mechanical properties of prosthetic feet and their effects on level gait of persons with amputations. These descriptions focus on recent literature and knowledge gained from controlled studies of different properties including stiffness/flexibility, damping, roll-over characteristics, active push... | Prosthetic Foot Principles and Their Influence on Gait | 10.1007/978-3-319-14418-4_74 |
2018-01-01 | The grid-connected inverter plays an important role in injecting high-quality power into the power grid. The injected grid current is affected by the grid voltage at the point of common coupling (PCC). This chapter studies the feedforward scheme of the grid voltage for single-phase LCL -type grid-connected inverter. Fi... | Full-Feedforward of Grid Voltage for Single-Phase LCL-Type Grid-Connected Inverter | 10.1007/978-981-10-4277-5_6 |
2018-01-01 | It is well agreed that the dynamic properties including the dynamic shear modulus and damping ratio play essential role in many dynamic geotechnical problems. In this paper, the dynamic properties of the typical Shanghai clay were determined by resonant column tests on 38 undisturbed samples obtained from 9 site invest... | Laboratory Measurements of the Dynamic Properties of Shanghai Clay | 10.1007/978-981-10-4508-0_54 |
2018-01-01 | This paper reviews the methods of correcting the frequency response of short-period seismometers and geophones, i.e., the multiplication of the transfer sensor functions by the transfer function of the secondorder correction filter and the provision of a considerable attenuation in the oscillating system ( h = 5–10) fo... | Short-Period Seismometers in Seismology | 10.3103/S074792391801005X |
2018-01-01 | 3D printing technologies have made creating prototypes with complex geometries relatively simple thus it has become an increasingly popular method for creating prototypes in a research setting. Therefore, it is crucial to understand the properties of the materials being used. This paper examines the effects of printing... | Complex Modulus Variation by Manipulation of Mechanical Test Method and Print Direction | 10.1007/978-3-319-62834-9_2 |
2018-01-01 | For the LCL -type grid-connected inverter, the capacitor-current-feedback active-damping is equivalent to a resistor in parallel with the filter capacitor to damp the LCL filter resonance. This active-damping method has no power loss and has been widely used. Based on the capacitor-current-feedback active-damping and t... | Controller Design for LCL-Type Grid-Connected Inverter with Capacitor-Current-Feedback Active-Damping | 10.1007/978-981-10-4277-5_5 |
2018-01-01 | Of a great interest for loess is the wide distribution over the seismic region in China and it is vulnerable to seismic-hazard under the earthquake loads. Evaluation and understanding the dynamic properties of loess is therefore a matter of concern at both academic and practical levels. This paper presents results from... | Experimental Study on Shear Modulus and Damping Properties of Loess | 10.1007/978-981-13-0125-4_35 |
2018-01-01 | Piping systems are considered as lifeline of the industrial units. The earthquake load is one of the important design basis accidental loadings, considered in the design of the nuclear power plant piping systems. To meet the contradictory requirements of thermal and earthquake loads, snubbers are used. Snubbers allow f... | Determination of Effectiveness of Viscoelastic Dampers in Controlling the Seismic Response of Piping System by Shake Table Testing | 10.1007/978-981-10-7197-3_41 |
2018-01-01 | This paper is devoted to developing the control algorithms of semi-active systems of vehicle suspensions. In order to accomplish the goal, a vehicle was equipped with controlled magneto-rheological (MR) dampers. The model of a vehicle with the controlled suspension was developed. It was assumed that controlling the for... | Algorithm for Damping Control in Vehicle Suspension Equipped with Magneto-Rheological Dampers | 10.1007/978-3-319-96598-7_19 |
2018-01-01 | The shock absorber has a very important influence on the stability and smoothness of the vehicle. The fluid characteristics of the shock absorber affect the damping force of the shock absorber directly. In this paper, the vehicle friction damper is studied. Using Solid Works to establish the three-dimensional model of ... | CFD Simulation of Internal Fluid Characteristics of Vehicle Friction Damper | 10.1007/978-3-319-70990-1_51 |
2018-01-01 | The operating principle of the conventional Costas loop for QPSK is explained (other types of Costas loops for QPSK are discussed in Chaps. 6 and 9). Dynamic behavior of the loop is described using a novel mathematical model developed by the author. This new model allows the designer of a Costas loop to explicitly comp... | Conventional Costas Loop for QPSK | 10.1007/978-3-319-72008-1_4 |
2018-01-01 | A modified Costas loop for mPSK (m-ary Phase Shift Keying) is described in this chapter. In BPSK, the phase of the modulated carrier can take two states, 0 or 180°. One bit can be transmitted within one symbol interval. With QPSK, the phase can take four states, 45°, 135°, 225°, or 315°; hence, 2 bits can be transmitte... | Costas Loop for m-ary Phase Shift Keying (mPSK) | 10.1007/978-3-319-72008-1_7 |
2018-01-01 | Dynamic substructuring allows analysts to combine component structural dynamics models into system-level models. For purely structural systems, dynamic substructuring techniques are well established. Here, one such technique is adapted to solve the coupled response of elastic structures in contact with acoustic cavitie... | Coupling Acoustic-Structure Systems Using Dynamic Substructuring | 10.1007/978-3-319-74654-8_15 |
2018-01-01 | In this chapter, sessile cells of the innate immune system are briefly introduced. Defined as cells equipped with diverse pattern recognition molecules capable of detecting MAMPs and DAMPs, they encompass cells such as epithelial cells, fibroblasts, vascular cells, chondrocytes, osteoblasts, and adipocytes. Located at ... | Sessile Innate Immune Cells | 10.1007/978-3-319-78655-1_9 |
2018-01-01 | The nonlinear dynamics of a rigid rotor supported on two identical metal mesh damped flexible pivot tilting pad gas bearings is investigated. This new type gas bearing is used because of high effective damping level and adequate compliance with variations in rotor geometry or misalignment. Time domain simulation that c... | Bifurcation and nonlinear dynamic behaviours of a metal mesh damped flexible pivot tilting pad gas bearing system | 10.1007/s11071-017-3900-8 |
2018-01-01 | We consider some principal problems of nonequilibrium statistical thermodynamics in the framework of the Zubarev nonequilibrium statistical operator approach. We present a brief comparative analysis of some approaches to describing irreversible processes based on the concept of nonequilibrium Gibbs ensembles and their ... | Nonequilibrium Statistical Operator Method and Generalized Kinetic Equations | 10.1134/S004057791801004X |
2018-01-01 | The paper analyzes the influence of the characteristics of proof mass Proof mass on the output characteristics of cantilever- type piezoelectric generators Piezoelectric generator (PEG) (PEGs) with bimorph Bimorph elements by using finite element modeling (FEM) in the ANSYS software. This investigation studies the effe... | Analysis of the Performance of the Cantilever-Type Piezoelectric Generator Based on Finite Element Modeling | 10.1007/978-981-10-7197-3_25 |
2018-01-01 | There are a number of problematic features within the current treatment of time in physical theories, including the “timelessness” of the Universe as encapsulated by the Wheeler–DeWitt equation. This paper considers one particular investigation into resolving this issue; a conditional probability interpretation that wa... | Realistic Clocks for a Universe Without Time | 10.1007/s10701-017-0128-x |
2018-01-01 | A vane Magnetorheological (MR) damper for the purpose of suspension system was designed, manufactured and tested. The working methodology of the designed rotary damper was outlined and its theoretical model was also defined in the article. The magnetic field working as well as design was modelled on ANSYS. It is clearl... | Design and Testing of a Novel Vane Type Magnetorheological Damper | 10.1007/978-981-13-2396-6_24 |
2018-01-01 | The classical Craig-Bampton method does not take any damping effects into account for the model order reduction of damped systems. There is generally no justification to neglect damping effects. If damping significantly influences the dynamic behavior of the system, the approximation accuracy can be very poor. One proc... | Comparison of Craig-Bampton Approaches for Systems with Arbitrary Viscous Damping in Dynamic Substructuring | 10.1007/978-3-319-74654-8_3 |
2018-01-01 | In this paper, we deal with matrix-free preconditioners for nonlinear conjugate gradient (NCG) methods. In particular, we review proposals based on quasi-Newton updates, and either satisfying the secant equation or a secant-like equation at some of the previous iterates. Conditions are given proving that, in some sense... | Quasi-Newton Based Preconditioning and Damped Quasi-Newton Schemes for Nonlinear Conjugate Gradient Methods | 10.1007/978-3-319-90026-1_1 |
2017-12-11 | Existing estimates of the gravitational-wave damping timescale of the dominant quadrupole oscillation mode in the case of rapidly rotating stars are based on using a Newtonian estimate for the energy of the mode, in combination with the lowest-order post-Newtonian quadrupole formula for estimating the gravitational-wav... | Universal and approximate relations for the gravitational-wave damping timescale of f-modes in neutron stars | 10.1007/s10714-017-2331-7 |
2017-12-08 | In this paper, the Green function method (GFM) is implemented for forced vibration analysis of carbon nanotubes (CNTs) conveying fluid in thermal environment. The Eringen’s nonlocal elasticity theory is used to take into account the size effect of CNT with modeling the CNT wall–fluid flow interaction by means of slip b... | Application of the Green function method to flow-thermoelastic forced vibration analysis of viscoelastic carbon nanotubes | 10.1007/s10404-017-2022-4 |
2017-12-01 | In this paper, we consider a vibrating system of Timoshenko-type in a bounded one-dimensional domain with discrete time delay and complementary frictional damping and infinite memory controls all acting on the transversal displacement. We show that the system is well-posed in the sens of semigroup and that, under appro... | Well-posedness and energy decay for Timoshenko systems with discrete time delay under frictional damping and/or infinite memory in the displacement | 10.1007/s13370-017-0514-8 |
2017-12-01 | The problem of controlling motion of the elastic body so as that to eliminate its free oscillations both at translating the elastic body and upon reaching the final state war posed and resolved. Such mode of displacement and the control realizing it were called vibrationless. The vibrationless control is constructed as... | Control of elastic plant movement without excitation of eigen-oscillation | 10.1134/S0005117917120037 |
2017-12-01 | The solution to the softening Duffing differential equation $${\ddot{x}}+2\beta {\dot{x}}+\alpha x-\varepsilon x^{3}=0$$ x ¨ + 2 β x ˙ + α x - ε x 3 = 0 , for an unforced system with damping is described in terms of the Jacobi elliptic functions. The parameter of the Jacobi elliptic functions is allowed to be time-depe... | The Duffing Oscillator with Damping for a Softening Potential | 10.1007/s40819-017-0333-5 |
2017-12-01 | In this study, a unified nonlinear dynamic buckling analysis for Euler–Bernoulli beam–columns subjected to constant loading rates is proposed with the incorporation of mercurial damping effects under thermal environment. Two generalized methods are developed which are competent to incorporate various beam geometries, m... | Nonlinear dynamic stability analysis of Euler–Bernoulli beam–columns with damping effects under thermal environment | 10.1007/s11071-017-3811-8 |
2017-12-01 | This paper presents two variations of the artificial bee colony (ABC) algorithm, the classical and a modified version, called GBest, for the design of the proportional–integral and supplementary damping controllers: power system stabilizers and the unified power flow controller (UPFC)–power oscillation damping set. The... | Design of the PI–UPFC–POD and PSS Damping Controllers Using an Artificial Bee Colony Algorithm | 10.1007/s40313-017-0341-z |
2017-12-01 | We are concerned with the problem of determining the damping boundary coefficient appearing in a dissipative wave equation from a single boundary measurement. We prove that uniqueness holds at the origin provided that the initial condition is appropriately chosen. We show that the choice of the initial condition leadin... | Determining a boundary coefficient in a dissipative wave equation: uniqueness and directional Lipschitz stability | 10.1007/s00233-016-9845-2 |
2017-12-01 | A well known result states that the Łojasiewicz gradient inequality implies some estimates of the rate of convergence to equilibrium for solutions of gradient systems. We generalize this result to gradient-like systems satisfying certain angle condition and Kurdyka–Łojasiewicz inequality and to even more general situat... | Rate of Convergence to Equilibrium and Łojasiewicz-Type Estimates | 10.1007/s10884-016-9549-z |
2017-12-01 | This paper studies the application of mathematical models to analyze the vortex-induced vibrations of the tendons of a given TLP along the Indian coastline, by using an analytical approach, analyzed using MATLAB. The tendon is subjected to a steady current load, which causes vortex-shedding downstream, leading to cross... | Vortex-induced vibration of a tension leg platform tendon: Multi-mode limit cycle oscillations | 10.1007/s11804-017-1440-8 |
2017-12-01 | This paper is concerned with the existence of positive homoclinic solutions for the second-order differential equation $$\begin{aligned} u^{\prime \prime }+cu^{\prime }-a(t)u+f(t,u)=0, \end{aligned}$$ u ″ + c u ′ - a ( t ) u + f ( t , u ) = 0 , where $$c\ge 0$$ c ≥ 0 is a constant and the functions a and f are continuo... | Existence of positive homoclinic solutions for damped differential equations | 10.1007/s11117-017-0471-3 |
2017-12-01 | The paper is the first of a planned set of papers devoted to the world experience in development of Low Emission combustors (LEC) for industrial Gas Turbines (GT). The purpose of the article is to summarize and analyze the most successful experience of introducing the principles of low-emission combustion of the so-cal... | Low-Emission combustion of fuel in aeroderivative gas turbines | 10.1134/S0040601517120011 |
2017-12-01 | The present study evaluates the potential of a bio-inspired pulsation damper in a vane pump used in mobile hydraulic applications. Pressure pulsations caused by such positive displacement pumps can lead to malfunctions and noise in a hydraulic system. A common measure to reduce pressure pulsations is the integration of... | Damping of Pressure Pulsations in Mobile Hydraulic Applications by the Use of Closed Cell Cellular Rubbers Integrated into a Vane Pump | 10.1016/S1672-6529(16)60444-4 |
2017-12-01 | This study describes two investigations: first, the applicability of NiTi wires in the damping of oscillations induced by wind, rain, or traffic in cable-stayed bridges; and second, the characteristic properties of NiTi, i.e., the effects of wire diameter and particularly the effects of summer and winter temperatures a... | Civil Engineering Applications: Specific Properties of NiTi Thick Wires and Their Damping Capabilities, A Review | 10.1007/s40830-017-0135-y |
2017-12-01 | Aluminium-based adjuvants (ABAs) have been used in human and veterinary vaccines for decades, and for a long time, the adjuvant properties were believed to be mediated by an antigen depot at the injection site, prolonging antigen exposure to the immune system. The depot hypothesis is today more or less abandoned, and i... | Sequestering of damage-associated molecular patterns (DAMPs): a possible mechanism affecting the immune-stimulating properties of aluminium adjuvants | 10.1007/s12026-017-8972-5 |
2017-12-01 | A ten storey steel office building, designed for a low-risk zone under the former Italian seismic code and in line with Eurocodes 1 and 3, is considered as test structure. More specifically, the dynamic response of the test structure in a no fire situation is compared with what would happen in the event of three fire s... | Dynamic Response of Steel Framed Structures Fire-Retrofitted with Viscoelastic-Damped Braces | 10.1007/s40999-016-0134-y |
2017-11-18 | In this paper, we consider a fourth-order suspension bridge equation with nonlinear damping term $$|u_t|^{m-2}u_t$$ | u t | m - 2 u t and source term $$|u|^{p-2}u$$ | u | p - 2 u . We give necessary and sufficient condition for global existence and energy decay results without considering the relation between m and p .... | Global existence, asymptotic behavior and blow-up of solutions for a suspension bridge equation with nonlinear damping and source terms | 10.1007/s00030-017-0491-5 |
2017-11-01 | In this paper, we study Landau damping in the weakly collisional limit of a Vlasov-Fokker-Planck equation with nonlinear collisions in the phase-space $$(x,v) \in {{\mathbb {T}}}_x^n \times {\mathbb {R}}^n_v$$ ( x , v ) ∈ T x n × R v n . The goal is four-fold: (A) to understand how collisions suppress plasma echoes and... | Suppression of Plasma Echoes and Landau Damping in Sobolev Spaces by Weak Collisions in a Vlasov-Fokker-Planck Equation | 10.1007/s40818-017-0036-6 |
2017-11-01 | The introduction of fillers/additives into polymer matrices is a practical and effective method for preparation of damping materials. In the current work, a designed 9,10-dihydro-9-oxa-10-phosphaphenanthrene 10-oxide-based oligosiloxane (DOPO-PMVS) was used as an additive to improve the damping properties of methyl phe... | Prospect of 9,10-dihydro-9-oxa-10-phosphaphenanthrene 10-oxide-based oligosiloxane in the preparation of high damping methyl phenyl vinyl silicone rubbers with broad temperature range | 10.1007/s10853-017-1433-7 |
2017-11-01 | There is a significant body of evidence from both disaggregate choice modelling literature and practical travel demand forecasting that the responsiveness to cost and possibly to time diminishes with journey length. This has, in Britain at least, been termed ‘Cost Damping’, and is recognised in guidance issued by the U... | Cost and time damping: evidence from aggregate rail direct demand models | 10.1007/s11116-016-9711-9 |
2017-11-01 | The thermo-elastic damping is a dominant source of internal damping in micro-electromechanical systems (MEMS) and nano-electromechanical systems (NEMS). The internal damping cannot neither be controlled nor minimized unless either mechanical or geometrical properties are changed. Therefore, a novel FGMNEM system with a... | Thermoelastic Damping in FGM Nano-Electromechanical System in Axial Vibration Based on Eringen Nonlocal Theory | 10.1007/s10778-018-0854-6 |
2017-11-01 | In this paper, the viscoelastic damped response of cross-ply laminated shallow spherical shells is investigated numerically in a transformed Laplace space. In the proposed approach, the governing differential equations of cross-ply laminated shallow spherical shell are derived using the dynamic version of the principle... | Viscoelastic damped response of cross-ply laminated shallow spherical shells subjected to various impulsive loads | 10.1007/s11043-017-9339-y |
2017-11-01 | Tooth pitting is a common failure mode of a gearbox. Many researchers investigated dynamic properties of a gearbox with localized pitting damage on a single gear tooth. The dynamic properties of a gearbox with pitting distributed over multiple teeth have rarely been investigated. In this paper, gear tooth pitting propa... | Spur Gear Tooth Pitting Propagation Assessment Using Model-based Analysis | 10.1007/s10033-017-0196-z |
2017-11-01 | While predicting the impact force histories from the Zener impact model with different material properties of impactors, several discrepancies were observed and reported in this article. To overcome these discrepancies, a modified Zener model is proposed to accurately calculate impact force histories. In the original Z... | Modified Zener Theory to Accurately Predict Impact Force Histories for Soft Impactors Employing Spiral Sensing | 10.1007/s11340-017-0316-9 |
2017-11-01 | We investigated the effect of martensitic structure on the magnetic field controlled damping effect in a Ni_53Fe_2Mn_20Ga_25 polycrystalline ferromagnetic shape memory alloy, which undergoes the structure transitions in the sequence of parent phase → seven-layer modulated (14M) martensite → non-modulated tetragonal mar... | Effect of martensitic structure on the magnetic field controlled damping effect in a Ni–Fe–Mn–Ga ferromagnetic shape memory alloy | 10.1007/s10853-017-1399-5 |
2017-11-01 | With the springing up of the MEMS industry, research on accelerometers is focused on miniaturization, integration, high reliability, and high resolution, and shares extensive application prospects in military and civil fields. The piezoresistive accelerometer is the first element of measurement which converts the vibra... | Study and analysis of the piezoresistive accelerometer stability and improvement of their performances | 10.1007/s13198-017-0622-8 |
2017-11-01 | The purpose of this paper is to propose an analytical model for a new type of steel cushion for use in Reinforced Concrete (RC) frames. Theoretically, steel cushions were installed in the RC frame between a beam and chevron-type bracing elements to dissipate a considerable amount of energy during earthquake events. The... | Model proposal for steel cushions for use in Reinforced Concrete frames | 10.1007/s12205-017-0477-1 |
2017-11-01 | This work investigates the effects of fibre content and fibre orientation on the damping of flax fibre-reinforced polypropylene composites. Laminates of various fibre contents were manufactured by a vacuum bagging process; their dynamic behaviour were then found from the vibration measurements of beam test specimens us... | Vibration damping of flax fibre-reinforced polypropylene composites | 10.1007/s12221-017-7418-y |
2017-11-01 | Viscous dampers are dissipation devices widely employed for seismic structural control. To date, the performance of systems equipped with viscous dampers has been extensively analysed only by employing deterministic approaches. However, these approaches neglect the response dispersion due to the uncertainties in the in... | Effect of the damper property variability on the seismic reliability of linear systems equipped with viscous dampers | 10.1007/s10518-017-0169-8 |
2017-11-01 | The stability of the whirl motion of a breathing cracked rotor with the distinction of stationary damping and the asymmetric rotational damping is studied. By Lagrange’s principal, the motion equations are formed in rotational frame such that the multi-asymmetric system, i.e., asymmetric rotational damping and asymmetr... | Stability analysis of the whirl motion of a breathing cracked rotor with asymmetric rotational damping | 10.1007/s11071-017-3746-0 |
2017-11-01 | This study, for the first time, investigates the nonlinear bistable response of electrically actuated initially imperfect viscoelastic microresonators under DC and AC actuations, while including fringing field effects and retaining both longitudinal and transverse motions. The modified version of the couple stress theo... | Bistable nonlinear response of MEMS resonators | 10.1007/s11071-017-3753-1 |
2017-11-01 | Pinus tabulaeformis (Chinese pine) is a widely planted conifer species in northern China and is used for soil and water conservation on the Loess Plateau. Due to its strong reliance on ectomycorrhizae and low survival rate from damping-off during seedling cultivation and in nurseries, we explored the early influence of... | Prior contact of Pinus tabulaeformis with ectomycorrhizal fungi increases plant growth and survival from damping-off | 10.1007/s11056-017-9601-9 |
2017-11-01 | Various types of controlling mechanisms have been investigated to decrease vibrations of different structures, and in many cases, the reliability has been increased with respect to conventional methods of structural optimization. Among them, using passive viscous damper is one of the useful methods to control structure... | Frequency Domain Long-Term Efficiency of Viscous Damper in Jacket Platforms Under Random Wave Load | 10.1007/s13369-017-2534-y |
2017-11-01 | In boring process due to larger overhanging length of tool holder, tool vibration is considered as a significant factor which results in poor surface finish, noise generation, accelerated tool wear and reduced life period of machine tool. This tool vibration is a result of interaction between metal cutting process and ... | Attenuation of vibration in boring tool using spring controlled impact damper | 10.1007/s12008-015-0292-1 |
2017-10-30 | In this paper, we analyze the evolution of quantum coherence in a two-qubit system going through the amplitude damping channel. After they have gone through this channel many times, we analyze the systems with respect to the coherence of their output states. When only one subsystem goes through the channel, frozen cohe... | Coherence evolution in two-qubit system going through amplitude damping channel | 10.1007/s11433-017-9095-7 |
2017-10-01 | Energy dissipation mostly represents unwanted outcome but in the biochemical processes it may alter the biochemical pathways. However, it is rarely considered in the literature although energy dissipation and its alteration due to the changes in cell microenvironment may improve methods for guiding chemical and biochem... | Modeling of the metabolic energy dissipation for restricted tumor growth | 10.1007/s10863-017-9723-y |
2017-10-01 | Small-strain damping is a key factor of soil behavior under cyclic loading: although the value of small-strain damping is such small that would not compete with damping at larger strains (that would have a more significant impact in dynamic response analyses), repeated energy consumption of the small-strain damping wou... | Experimental Comparison and Study on Small-Strain Damping of Remolded Saturated Soft Clay | 10.1007/s10706-017-0244-6 |
2017-10-01 | This study addresses well-posedness of a Mindlin–Timoshenko (MT) plate model that incorporates nonlinear viscous damping and nonlinear source term in Neumann boundary conditions. The main results verify local and global existence of solutions as well as their continuous dependence on the initial data in appropriate fun... | Well-posedness of Mindlin–Timoshenko Plate with Nonlinear Boundary Damping and Sources | 10.1007/s00245-016-9357-1 |
2017-10-01 | The dynamic characteristics of a pressure regulator (a direct-action safety valve) are investigated. A regulator with a shutoff valve made of elastic material and reinforced by an elastic spring is described. The phase-trajectory method is used to establish the parameters of the regulator and the conditions in which it... | Dynamic characteristics of pressure regulators with elastic shutoff valves | 10.3103/S1068798X17100203 |
2017-10-01 | In the present study, the dynamic characterization of a flexible spinning shaft with constant eccentricity driven by a non-ideal energy source (DC motor) with external and internal damping has been focused. It is well established that the structural response of a vibratory system to which a non-ideal drive is connected... | Dynamic characterization of a flexible internally damped spinning shaft with constant eccentricity | 10.1007/s00419-017-1285-2 |
2017-10-01 | Numerous engineering structures can be modeled as flexible beams carrying appendages. Physical time-dependent phenomena in such structures appear by considering nonlinear models. Accordingly, the free vibration of a nonlinear Rayleigh beam carrying a linear mass–spring–damper is investigated in this research. The nonli... | Large amplitude free vibration of a viscoelastic beam carrying a lumped mass–spring–damper | 10.1007/s11071-017-3710-z |
2017-10-01 | Dynamic properties namely shear modulus (G) and damping (h) are input parameters for predicting the ground response of natural soil deposits. The dynamic properties of sands and clays are dependent on many factors such as void ratio, confining pressure, strain amplitude, morphology, and plasticity characteristics. Cons... | Dynamic Properties of Sand–Fines Mixtures | 10.1007/s10706-017-0247-3 |
2017-10-01 | The non-linear viscoelastic properties of pure polypropylene and its clay nanocomposites are studied to establish structure–property relationship in conjunction with clay concentrations. First, flow birefringence is performed through a slit-die to obtain centerline principal stress difference during elongational flow f... | Non-linear viscoelastic behavior and damping factor of polypropylene/clay nanocomposites | 10.1007/s13726-017-0565-6 |
2017-10-01 | In this paper, we consider the linearized Vlasov–Poisson equation around an homogeneous Maxwellian equilibrium in a weakly collisional regime: there is a parameter $${\varepsilon }$$ ε in front of the collision operator which will tend to 0. Moreover, we study two cases of collision operators, linear Boltzmann and Fok... | Landau Damping for the Linearized Vlasov Poisson Equation in a Weakly Collisional Regime | 10.1007/s10955-017-1848-1 |
2017-10-01 | In the present work, earthquake-induced structural responses at heavy damping are considered towards the assessment of current strong-motion output-only modal parameters via a novel refined Frequency Domain Decomposition (rFDD) approach. Classical FDD assumptions of stationary white noise input and light damping no lon... | Refined Frequency Domain Decomposition modal dynamic identification from earthquake-induced structural responses | 10.1007/s11012-017-0659-4 |
2017-10-01 | A simple theoretical dynamic model with a linearized damping coefficient is proposed for the gap resonance problem, as often referred to as the piston mode wave motion in a narrow gap formed by floating bodies. The relationship among the resonant response amplitude and frequency, the reflection and transmission coeffic... | Theoretical and numerical investigations of wave resonance between two floating bodies in close proximity | 10.1016/S1001-6058(16)60792-8 |
2017-10-01 | In the framework of energy harvesting from flow-induced vibrations, understanding the behaviour of dynamic systems under high levels of damping is a key issue. In particular, this work refers to two-degree-of-freedom elongated rectangular plates prone to the aeroelastic instability of classical flutter. The effect of h... | Destabilizing effect of damping on the post-critical flutter oscillations of flat plates | 10.1007/s11012-016-0604-y |
2017-10-01 | Liquid dampers are attractive for engineering applications to suppress undesired vibration resulting from wind, wave and earthquake excitation. This is particularly relevant to tuned liquid column dampers due to their high volumetric efficiency, consistent behaviour and nonlinear but quantifiable damping mechanism. The... | Characterisation of instantaneous dynamic parameters in vibration analysis of tuned liquid column dampers | 10.1007/s11071-017-3690-z |
2017-10-01 | This paper proposes an original and efficient approach to the moving load problem on Euler–Bernoulli beams, with Kelvin–Voigt viscoelastic translational supports and rotational joints, and in addition, equipped with Kelvin–Voigt viscoelastic tuned mass dampers (TMDs). While supports are taken as representative of exter... | On the moving load problem in beam structures equipped with tuned mass dampers | 10.1007/s11012-016-0599-4 |
2017-10-01 | A composite material system comprised of a monostable negative stiffness (NS) structure within a polymer matrix was designed, fabricated, and experimentally evaluated. The monostable negative stiffness (NS) structure was designed using a combination of analytical and numerical models and manufactured in stainless steel... | Design, Manufacture, and Quasi-Static Testing of Metallic Negative Stiffness Structures within a Polymer Matrix | 10.1007/s11340-017-0290-2 |
2017-10-01 | Choosing the right control strategies is an important task for effective operation of variable air volume reheat (VAVR) system in commercial buildings. In this design, dampers’ position inside air terminal units (ATUs) are modulated to adjust the amount of air supply volume based on thermal zones’ cooling or heating de... | Performance evaluation of damper control settings for operation of multiple-zone variable air volume reheat system in different building applications and climate types | 10.1007/s12273-017-0353-4 |
2017-10-01 | The present paper addresses the comparative study of two adjacent single-degree-of-freedom structures for elastic and inelastic systems with and without pounding. The study is also carried out in the presence and absence of tuned mass damper under (TMD) seismic excitations. The tuned mass damper considered for the pres... | Seismic Pounding Response of Singled-Degree-of-Freedom Elastic and Inelastic Structures Using Passive Tuned Mass Damper | 10.1007/s40999-017-0178-7 |
2017-10-01 | In this paper, the thermoelastic damping of the in-extensional vibration of rings is analyzed by dual-phase-lagging generalized thermoelasticity theory. In this work, the Q-factor for thermoelastic damping is derived. The effect of the ring radius and thickness, the rotating speed, mode numbers and ambient temperatures... | Dual-phase-lagging thermoelastic damping in-extensional vibration of rotating nano-ring | 10.1007/s00542-017-3294-z |
2017-10-01 | A complex modal truncation augmentation method is proposed in the present study for the non-classically damped systems. Compared to the traditional mode displacement superposition approach, this method considers the contributions from the high vibration modes and can therefore increase the prediction accuracy of the st... | An improved response spectrum method for non-classically damped systems | 10.1007/s10518-017-0144-4 |
2017-10-01 | The present work is aimed at studying the mechanic properties of the extra-wide concrete self-anchored suspension bridge under static and dynamic vehicle loads. Based on the field test using 12 heavy trucks and finite element simulations, the static deformations of different components, stress increments and distributi... | Test and numerical investigations on static and dynamic characteristics of extra-wide concrete self-anchored suspension bridge under vehicle loads | 10.1007/s11771-017-3650-2 |
2017-10-01 | Hybrid simulation is a cost-effective testing method to simulate responses of a structure under earthquake loads. In a conventional hybrid simulation, the structure is divided into experimental and numerical substructures. Experimental substructures represent the critical components that cannot be reliably simulated by... | Comparison of online model updating methods in pseudo-dynamic hybrid simulations of TADAS frames | 10.1007/s10518-017-0147-1 |
2017-09-27 | In this paper, we first introduce Ket–Bra entangled state method to solve master equation of finite-level system, which can convert master equation into Schrödinger-like equation and solve it with the mature methodology of Schrödinger equation. Then, several physical models include a radioactivity damped 2-level atom d... | Ket–Bra entangled state method for solving master equation of finite-level system | 10.1007/s11128-017-1710-z |
2017-09-26 | We obtain infinitely many nontrivial periodic solutions for a class of damped vibration problems, where nonlinearities are superlinear at infinity and primitive functions of nonlinearities are allowed to be sign-changing. By using some weaker conditions, our results extend and improve some existing results in the liter... | Damped vibration problems with sign-changing nonlinearities: infinitely many periodic solutions | 10.1186/s13661-017-0873-y |
2017-09-25 | In this paper, we study a second-order, nonlinear evolution equation with damping arising in elastodynamics. The nonlinear term is monotone and possesses a convex potential but exhibits anisotropic and nonpolynomial growth. The appropriate setting for such equations is that of monotone operators in Orlicz spaces. Globa... | Convergence of a full discretization for a second-order nonlinear elastodynamic equation in isotropic and anisotropic Orlicz spaces | 10.1007/s00033-017-0863-z |
2017-09-19 | This paper is concerned with the long-time behavior for a class of N -dimensional thermoelastic coupled structure equations with structural damping and past history thermal memory u t t + △ 2 u + ν △ θ + △ 2 u t − [ σ ( ∫ Ω ( ∇ u ) 2 d x ) + ϕ ( ∫ Ω ∇ u ∇ u t d x ) ] △ u + f 1 ( u ) = q 1 ( x ) , in Ω × R + , θ t − ι ... | Long-time dynamics of N-dimensional structure equations with thermal memory | 10.1186/s13661-017-0864-z |
2017-09-01 | Data recorded during a field test involving an instrumented drilled shaft under vertical excitations are examined in order to (1) extract the soil–pile system’s dynamic impedance, and (2) to evaluate the small-strain shear stiffness and material damping properties of the surrounding soil. Numerical simulations of stead... | Interaction of a pile with layered-soil under vertical excitations: field experiments versus numerical simulations | 10.1007/s10518-017-0099-5 |
2017-09-01 | Electric power infrastructure has recently undergone a comprehensive transformation from electromagnetics to semiconductors. Such a development is attributed to the rapid growth of power electronic converter applications in the load side to realize energy conservation and on the supply side for renewable generations an... | Multi-time scale dynamics in power electronics-dominated power systems | 10.1007/s11465-017-0428-z |
2017-09-01 | Modern metal processing is characterized by high spindle speed machines causing high frequency vibrations. This significantly increases therequirements for stiffness and damping of cutting tool. The purpose of this study is to improve the quality of machined surface and the efficiency of hard turning using shim with hi... | Improvement of cutting tool performance during machining process by using different shim | 10.1016/j.acme.2017.01.008 |
2017-09-01 | Prediction of the roll damping of a ship with bilge keels using traditional techniques, such as Ikeda’s method, is no longer sufficient when the bilge keels interact with the free surface. The discrepancies occurring between this method and actual roll damping are due to free surface interaction and vortex shedding, wh... | Bilge keel–free surface interaction and vortex shedding effect on roll damping | 10.1007/s00773-016-0423-9 |
2017-09-01 | Helical springs are mostly subjected to compression and expansion in their life cycles under working conditions in vibratory feeder. The continuous reversal stress leads to permanent deformations in pitch of coils of the helical springs due to creep phenomenon in which reversal stresses under various ambient conditions... | Analysis of variations in vibration behavior of vibratory feeder due to change in stiffness of helical springs using FEM and EMA methods | 10.1007/s40430-017-0767-z |
2017-09-01 | A particle impact damper is a vibration absorber type that consists of a container attached to a primary vibrating structure. It also contains many particles that are constrained to move inside the container, whereby the damping effect can be obtained by collision between particles and the container. The discrete eleme... | A combined approach for modeling particle behavior in granular impact damper using discrete element method and cellular automata | 10.1007/s10999-016-9344-3 |
2017-09-01 | The capacitance variation of capacitive accelerometer as a function of vibratory movement relative frequency is presented using a developed model validated by simulation and experimental tests. The damping rate effect on accelerometer capacitance variation is studied for four damping rate values. The first value is tha... | Parameters improvement and suggestion of new design of capacitive accelerometer | 10.1007/s10470-017-0970-y |
2017-09-01 | Comfort levels on modern superyachts have recently been the object of specific attention of the most important Classification Societies, which issued new rules and regulations for evaluating noise and vibration maximum levels. These rules are named “Comfort Class Rules” and set the general criteria for noise and vibrat... | Vibration analysis for the comfort assessment of superyachts | 10.1007/s11804-017-1420-z |
2017-09-01 | Propagation of a torsional wave in a doubly-layered half-space structure of an initially stressed heterogeneous viscoelastic layer sandwiched between a layer and a half-space of heterogeneous dry sandy media is studied. A closed form complex expression for the velocity profile is obtained under effective boundary condi... | Dispersion and attenuation of torsional wave in a viscoelastic layer bonded between a layer and a half-space of dry sandy media | 10.1007/s10483-017-2239-8 |
2017-09-01 | A Stockbridge damper system can control the aeolian vibrations in a transmission line by dissipating excitation energy through the self-excitation of the damper system. Therefore, locating these resonant frequencies is a critical design consideration for a Stockbridge damper to determine the efficiency of spectral ener... | Design sensitivity analysis of a Stockbridge damper to control resonant frequencies | 10.1007/s12206-017-0810-0 |
2017-09-01 | The controllable rheological properties of MR fluid exhibit viscoelastic properties within pre-yield, which are essential for the characterization of MR dampers for the isolation of vibration. In the present work, using particle swarm optimisation (PSO), it is identified that the proportion of MR fluid constituents, fl... | Evaluation of optimal parameters of MR fluids for damper application using particle swarm and response surface optimisation | 10.1007/s40430-017-0875-9 |
2017-09-01 | Cyclic loading experiments for PC moment frames with beam-to-beam connections with a steel slit damper were conducted to evaluate their seismic vulnerability. Connections installed at the mid-length region of the beam as a connection between PC beams were developed to achieve fast-track construction. Shear links exist ... | Experimental assessment of seismic vulnerability of precast concrete beam-to-beam connections with steel slit damper | 10.1007/s13296-017-9030-9 |
2017-09-01 | The performance and effectiveness of the liquid column vibration absorber (LCVA) in controlling the vibration of structures have been investigated in this paper. To evaluate the performance of LCVA system in mitigating the structural response under dynamic loading (i.e. harmonic excitation), a set of experiments are co... | Dynamic response control of structures using liquid column vibration absorber: an experimental study | 10.1007/s40091-017-0163-z |
2017-09-01 | In response to the growing need for renewable energy, this paper proposes a new type of Tuned Mass Damper (TMD) to produce electrical power from the unused traffic-induced vibrational energy of structures in addition to its energy dissipative role. The proposed device, called the Tuned Mass Piezo-damper (TMPD), takes t... | Evaluation of energy-producing capability from pedestrian-induced vibration in footbridge by a new Tuned Mass Piezo-Damper | 10.1007/s12205-016-2817-y |
2017-09-01 | In this paper, a novel frequency dependent MR damper model based on trigonometric functions is proposed. The model presents the following advantages in comparison with other previously proposed models: (1) it is based on algebraic functions instead of differential equations, so that it does not present convergence prob... | A novel frequency dependent model based on trigonometric functions for a magnetorheological damper | 10.1007/s11012-017-0632-2 |
2017-08-04 | The initial boundary value problem of a class of Kirchhoff equations with strong damping and nonlinear dissipation is considered. By modifying Vitillaro’s argument, we prove a blow-up result for solutions with positive and negative initial energy respectively. | Blow-up of solutions to a class of Kirchhoff equations with strong damping and nonlinear dissipation | 10.1186/s13661-017-0843-4 |
2017-08-03 | The impact resonance test is a free vibration-based nondestructive test method that has been increasingly used in evaluation and characterization of asphalt concrete for the past two decades. The rheological modeling of the impact resonance test is conceptualized by a linear viscous damping mechanism having single degr... | Validation of Model Order Assumption and Noise Reduction Method for the Impact Resonance Testing of Asphalt Concrete | 10.1007/s10921-017-0436-2 |
2017-08-01 | Vortex-shedding flow induced by the vertical oscillation of a cylinder with bottom-attached disks of different diameter ratio D _d/ D _c and thickness ratio t _d/ D _c is studied by a 3D (three-dimensional) numerical model developed in this paper, and compared with the results obtained through 2D (two-dimensional) nume... | 3D effects on vortex-shedding flow and hydrodynamic coefficients of a vertically oscillating cylinder with a bottom-attached disk | 10.1007/s13344-017-0049-7 |
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