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2019-03-01 | A new simplified parametric model, which is more suitable for pantograph–catenary dynamics simulation, is proposed to describe the nonlinear displacement-dependent damping characteristics of a pantograph hydraulic damper and validated by the experimental results in this study. Then, a full mathematical model of the pan... | Effect of the nonlinear displacement-dependent characteristics of a hydraulic damper on high-speed rail pantograph dynamics | 10.1007/s11071-019-04766-4 |
2019-03-01 | The vortex-induced vibrations of a circular cylinder attached as a tip mass at the end of a cantilever beam are investigated for hybrid energy harvesting using two different transduction mechanisms, namely piezoelectric and electromagnetic. The high aeroelastic oscillations generated for a range of wind speeds are tran... | Characteristics and comparative analysis of piezoelectric-electromagnetic energy harvesters from vortex-induced oscillations | 10.1007/s11071-018-04757-x |
2019-03-01 | This paper systematically investigates the ground current crosstalk (GCC) of high-power cascaded chopper braking circuit (CCBC). Turning on and off the IGBTs of the CCBC will generate GCC problem between the upper and lower chopper braking circuits. The GCC may cause the freewheeling diode to be hard-off, resulting in ... | Ground Current Crosstalk Analysis and Suppression in High Power Cascaded Chopper Braking Circuit | 10.1007/s42835-019-00116-x |
2019-03-01 | Abstract The effectiveness of vibration-damping coatings is assessed by simulation. The experimental characteristics of the coatings are presented. An algorithm is proposed for assessment of the expected dynamic parameters of structures as a function of their shape and the characteristics of the vibration-damping mater... | Effectiveness of Vibration-Damping Coatings | 10.3103/S1068798X19030158 |
2019-03-01 | We study the behavior of the trajectories of a second-order differential equation with vanishing damping, governed by the Yosida regularization of a maximally monotone operator with time-varying index, along with a new Regularized Inertial Proximal Algorithm obtained by means of a convenient finite-difference discretiz... | Convergence of inertial dynamics and proximal algorithms governed by maximally monotone operators | 10.1007/s10107-018-1252-x |
2019-03-01 | In this study, we investigated the hydrodynamic and energy conversion performance of a double-float wave energy converter (WEC) based on the linear theory of water waves. The generator power take-off (PTO) system is modeled as a combination of a linear viscous damping and a linear spring. Using the frequency domain met... | Oscillation and Conversion Performance of Double-Float Wave Energy Converter | 10.1007/s11804-019-00083-9 |
2019-03-01 | In Richardson’s cascade description of turbulence, large vortices break up to form smaller ones, transferring the kinetic energy of the flow from large to small scales. This energy is dissipated at the smallest scales due to viscosity. We study energy cascade in a phenomenological model of vortex breakdown. The model i... | An intriguing analogy of Kolmogorov’s scaling law in a hierarchical mass–spring–damper model | 10.1007/s11071-018-04749-x |
2019-03-01 | This article shows the significant decrease in the dynamic elasticity modulus of the OT-4 titanium alloy within the frequency range of 0–25 Hz as compared with the static elasticity modulus with further stabilization of the mentioned dynamic modulus at 25–80 Hz based on study of the damping flexural vibrations of the c... | Identification of the Dynamic Elasticity Characteristics and Damping Properties of the OT-4 Titanium Alloy Based on Study of Damping Flexural Vibrations of the Test Specimens | 10.3103/S1052618819020110 |
2019-03-01 | This paper presents a new optimization methodology called movable damped wave algorithm for solving global optimization problems. The proposed methodology mimics mathematically the behavior of waveform induced by oscillating phenomena. It starts by creating multiple initial random solutions which are updated through in... | A movable damped wave algorithm for solving global optimization problems | 10.1007/s12065-018-0187-8 |
2019-02-15 | A probabilistic seismic demand modeling approach with the optimal intensity measure ( IM ) parameters determined a posteriori (POS-PSDM) is employed to examine and compare the full potential of the explanatory power of different IM formulations. A total of six IM formulations adopting the optimal IM parameters determin... | A posteriori optimal intensity measures for probabilistic seismic demand modeling | 10.1007/s10518-018-0484-8 |
2019-02-15 | Friction stir processing (FSP) was conducted on an Al-Si casting alloy. The Si phase and Al grains of an Al-Si casting alloy were refined through FSP. Furthermore, FSP with high rotation rate led to the precipitation of Mg and Si atoms and the formation of Mg_2Si phase in the Al-Si alloy. Precipitation improved the low... | Effect of Friction Stir Processing on the Microstructure, Damping Capacity, and Mechanical Properties of Al-Si Alloy | 10.1007/s11665-018-3844-2 |
2019-02-12 | Coherent vortices are often observed to persist for long times in turbulent 2D flows even at very high Reynolds numbers and are observed in experiments and computer simulations to potentially be asymptotically stable in a weak sense for the 2D Euler equations. We consider the incompressible 2D Euler equations linearize... | Vortex Axisymmetrization, Inviscid Damping, and Vorticity Depletion in the Linearized 2D Euler Equations | 10.1007/s40818-019-0061-8 |
2019-02-07 | This study aims to evaluate hysteresis response behavior of circular hollow steel damper (CHSD). Steel dampers are a type of passive dampers and commonly used for seismic dissipation in civil engineering structures. Steel dampers are widely used for seismic energy dissipation because they are easy to install, maintain ... | Low-Cycled Hysteresis Characteristics of Circular Hollow Steel Damper Subjected to Inelastic Behavior | 10.1007/s13296-018-0097-8 |
2019-02-01 | Abstract The article presents results of investigating the influence of elastic damping devices that secure the rotor and the stator under high-amplitude oscillations under unfavorable development of an accident, e.g., upon rubbing of the rotor against the stator. Motion equations for the oscillations of the rotor in t... | The Damping Capacity of Damping Devices during Rotor-over-Stator Rolling | 10.1134/S004060151902006X |
2019-02-01 | Constrained layer damping treatments are widely used in mechanical structures to damp acoustic noise and mechanical vibrations. A viscoelastic layer is thereby applied to a structure and covered by a stiff constraining layer. When the structure vibrates in a bending mode, the viscoelastic layer is forced to deform in s... | Damping Analysis of Cylindrical Composite Structures with Enhanced Viscoelastic Properties | 10.1007/s10443-018-9684-2 |
2019-02-01 | In the present paper, the effective damping properties of a symmetric foam-core sandwich beam with composite face plates reinforced with coated fibers is studied. A glass fiber-epoxy composite with additional rubber-toughened epoxy coatings on the fibers is considered as the material of the face plates. A micromechanic... | Optimal Damping Behavior of a Composite Sandwich Beam Reinforced with Coated Fibers | 10.1007/s10443-018-9698-9 |
2019-02-01 | New analytical solutions to water wave radiation by vertical truncated circular cylinders are developed based on linear potential flow theory. Two typical cylinder configurations of a surface-piercing cylinder and a submerged floating cylinder are considered. The multi-term Galerkin method is employed in the solution p... | New analytical solutions to water wave radiation by vertical truncated cylinders through multi-term Galerkin method | 10.1007/s11012-019-00964-x |
2019-02-01 | The dynamic rotor behavior is significantly affected by the stiffness and damping characteristics of the bearings. Therefore, it is important to identify these bearing parameters. For active magnetic bearings (AMBs), these bearing parameters not only could be identified from rotor dynamic response, but also from electr... | Identification of dynamic stiffness and damping in active magnetic bearings using transfer functions of electrical control system | 10.1007/s12206-019-0110-y |
2019-02-01 | Abstract The composition of surface layers formed during high-temperature interaction between Fe_70Si_15B_15 alloy and air impurities in an inert atmosphere is determined using equilibrium thermodynamic means. It is shown that at T = 1473 K, Fe_3O_4, FeSiO_3, and B_2O_3 are at the interface between the alloy and the ga... | Formation of Surface Layers on Fe_70Si_15B_15 Alloy upon Heating in an Inert Atmosphere with Air Impurities | 10.1134/S0036024419020122 |
2019-02-01 | Footbridges usually suffer from vibrations induced by the actions of pedestrians, which calls for various control measures to improve the serviceability. This study described the dynamic analysis and Tuned Mass Damper (TMD) implementation for a single-pylon cable-stayed footbridge scaled model, aimed at providing an ex... | Footbridge Serviceability Analysis: From System Identification to Tuned Mass Damper Implementation | 10.1007/s12205-018-0985-7 |
2019-01-30 | The ideal gas molecular movement (IGMM) algorithm has been introduced by the authors recently. Detailed studies on its behaviors uncover the fact that the gas molecules also experience a local self-vibration as they move. A comprehensive study was carried out here to introduce the molecular vibration thoroughly as a da... | Damping vibration-based IGMM optimization algorithm: fast and significant | 10.1007/s00500-017-2804-3 |
2019-01-25 | In this paper, we prove the linear damping for the 2-D Euler equations around a class of shear flows under the assumption that the linearized operator has no embedding eigenvalues. For the symmetric flows, we obtain the same decay estimate of the velocity as the monotone shear flows. Moreover, we confirm a new dynamica... | Linear Inviscid Damping and Vorticity Depletion for Shear Flows | 10.1007/s40818-019-0060-9 |
2019-01-24 | Combined with the finite element analysis (FEA) technology of fluid–structure interaction and nonlinear large deformation material, the integral FE models of a type of hydraulically damped rubber mount (HDM) with resonant column channel are set up. Based on the visualized simulation results, the working process of the ... | Visualization analysis of the working process and dynamic characteristics comparison of a hydraulically damped rubber mount with resonant column channel | 10.1007/s40430-019-1598-x |
2019-01-23 | Many buildings require reinforcement for various reasons including earthquake damage, change in design regulations and occupancy, adding stories, and lack of proper construction. One of the retrofitting systems that, in addition to increasing the lateral strength, provide the structure with significant ductility is the... | Investigation of retrofitting RC moment resisting frames with ADAS yielding dampers | 10.1007/s42107-018-0092-6 |
2019-01-22 | In this paper, we study the initial boundary value problem for a Petrovsky type equation with a memory term, nonlinear weak damping, and a superlinear source: u t t + Δ 2 u − ∫ 0 t g ( t − τ ) Δ 2 u ( τ ) d τ + | u t | m − 2 u t = | u | p − 2 u , in Ω × ( 0 , T ) . $$ u_{tt}+\Delta ^{2} u- \int _{0}^{t} g(t-\tau )\Del... | Blow-up of solutions for a nonlinear Petrovsky type equation with initial data at arbitrary high energy level | 10.1186/s13661-019-1136-x |
2019-01-18 | Fe-17Mn alloy has been attracted as a high damping alloy due to its excellent damping capacity and tensile properties. For its industrial application, it is necessary to improve both wear resistance and anti-oxidation. To solve this problem, gas nitriding was performed at 520 °C for 10 h using cold-rolled specimens. Th... | Influence of Gas Nitriding on the Damping Capacity of Fe-17Mn Alloy | 10.1007/s12540-018-0157-9 |
2019-01-17 | Intrinsic self-healing coatings have been drawing more and more attention over recent years. A self-healing coating that is able to maintain its original appearance and performance after damage is attractive for a huge scope of applications. This article reports the synthesis of a polyurethane-urea coating with 1-(2-am... | Stimuli-responsive polyurethane-urea polymer for protective coatings and dampening material | 10.1007/s11998-018-0114-z |
2019-01-17 | Background ALRs (AIM2-like Receptors) are germline encoded PRRs that belong to PYHIN gene family of cytokines, which are having signature N-terminal PYD (Pyrin, PAAD or DAPIN) domain and C-terminal HIN-200 (hematopoietic, interferon-inducible nuclear protein with 200 amino acid repeat) domain joined by a linker region.... | Nature of selection varies on different domains of IFI16-like PYHIN genes in ruminants | 10.1186/s12862-018-1334-7 |
2019-01-15 | Thin-wall water piping systems are key to the functionality of important facilities, such as hospitals and schools. Recent earthquakes have demonstrated the vulnerability of these systems. Conventional bracing of thin-wall water piping systems does not guarantee adequate seismic performance. Due to their flexibility, d... | Seismic response of viscously damped braced thin-wall piping system: a proof-of-concept case study | 10.1007/s10518-018-0447-0 |
2019-01-15 | To overcome the scale discontinuity of the Delayed Detached-eddy simulation (DDES) based on the v 2 ¯ − f $\overline {v^{2}}-f$ Reynolds-averaged Navier-Stokes (RANS) model developed by Jee and Shariff (International Journal of Heat and Fluid Flow 46(2014) 84), an improvement is proposed in the present work. For the ne... | An Enhanced Version of Delayed Detached-Eddy Simulation Based on the
v
... | 10.1007/s10494-018-9957-8 |
2019-01-15 | We introduce Hermite-polynomial-field excited coherent state (HPFECS) and then investigate analytically its evolution in an amplitude damping channel. We find that it evolves into a Laguerre-polynomial-weighted-chaotic photon field in this process, which turns out to be a new nonclassical state. The Q-function of this ... | Amplitude Damping of Hermite-Polynomial-Field Excited Coherent State | 10.1007/s10773-018-3928-7 |
2019-01-15 | A sharp and prolonged change in developing population processes requires mathematical methods to be improved. Unusual phase changes in the development of mass reproduction of insect species stipulated the idea to develop a new model in which not the final form of an asymptotically stable state after bifurcations but tr... | Continuous Model for the Devastating Oscillation Dynamics of Local Forest Pest Populations in Canada^* | 10.1007/s10559-019-00119-6 |
2019-01-15 | We estimate the quantum state of a two-level atom and the coherent field in a Kerr medium subject to the cavity damping. The density matrix of the field is considered within the framework of the dispersive approximation. We study dynamical properties of the linear entropy, Wehrl entropy, and the Wehrl phase density dur... | Effects of Kerr Medium and Stark Shift Parameter on Wehrl Entropy and the Field Purity for Two-Photon Jaynes–Cummings Model Under Dispersive Approximation | 10.1007/s10946-019-09764-w |
2019-01-15 | A performance-based seismic design method for plane reinforced concrete (R/C) moment-resisting frames (MRF) is proposed. The method is a force-based seismic design one, utilizing not a single strength reduction factor as all modern codes do, but different such factors for each of the first significant modes of the fram... | A seismic design method for reinforced concrete moment resisting frames using modal strength reduction factors | 10.1007/s10518-018-0436-3 |
2019-01-14 | The paper studies the behavior of horizontally polarized shear wave (SH-wave) in an initially stressed fiber-reinforced viscoelastic composite structure, where the elastic parameters vary linearly along the depth of the crustal layer. The displacements in each media have been calculated analytically and closed form dis... | SH-wave propagation in linearly varying fiber-reinforced viscoelastic composite structure uninitial stress | 10.1007/s12517-018-4211-1 |
2019-01-12 | In this paper, we study the linearly damped stochastic differential equations, which have the invariants satisfying a linear differential equation whose coefficients are linear constant or time-dependent. A stochastic exponential integrator is proposed for linearly damped stochastic differential equations to preserve t... | Structure-preserving stochastic conformal exponential integrator for linearly damped stochastic differential equations | 10.1007/s10092-019-0302-y |
2019-01-01 | Knowledge of first-order ordinary differential equations (calculus) | Transient Circuit Fundamentals | 10.1007/978-3-319-96692-2_7 |
2019-01-01 | We have seen in the preceding chapter that the simple oscillator under idealized conditions of no damping, once excited, will oscillate indefinitely with a constant amplitude at its natural frequency. However, experience shows that it is not possible to have a device that vibrates under these ideal conditions. Forces d... | Damped Single Degree-of-Freedom System | 10.1007/978-3-319-94743-3_2 |
2019-01-01 | In this chapter, we will study the motion of structures idealized as single-degree-of-freedom systems excited harmonically, that is, structures subjected to forces or displacements whose magnitudes may be represented by a sine or cosine function of time. This type of excitation results in one of the most important moti... | Response of One-Degree-of-Freedom System to Harmonic Loading | 10.1007/978-3-319-94743-3_3 |
2019-01-01 | A vertical rigid gyroscopic rotor with linear and cubic nonlinear damping of the support where the disk has a mass imbalance is considered herein. The motion equations in the form of Lagrange equations of the second kind have been composed to describe the motion of the rotor. The expressions have been found to determin... | Resonant Oscillations of a Vertical Hard Gyroscopic Rotor with Linear and Nonlinear Damping | 10.1007/978-3-030-20131-9_331 |
2019-01-01 | Auxiliary Mass Dampers (AMD) are often used to reduce excessive vibration amplitude in mechanical systems. It is also known that their performances are susceptible to changes in the frequency or in the nature of the excitation force. Therefore, to improve the robustness of the AMD it is necessary to design new systems ... | Tunable Auxiliary Mass Damper with Friction Joint: Numerical Assessment | 10.1007/978-3-319-91217-2_4 |
2019-01-01 | This chapter presents a summary of dynamic analytical methods for high-rise buildings in Japan. The following indispensable items for the dynamic analysis of skyscrapers are briefly introduced: Structural design criteria, analytical model, earthquake motion used for dynamic analysis, acquisition of earthquake ground mo... | Earthquake Response Analysis of High-Rise Buildings | 10.1007/978-981-13-7185-1_2 |
2019-01-01 | This chapter describes regenerative chatter in milling. Similar to Chap. 3 , both analytical and numerical analyses are presented to predict the process behavior. The analytical, frequency domain stability lobe diagram is adapted to milling. Two algorithms are described: average tooth angle and Fourier series. Time dom... | Milling Dynamics | 10.1007/978-3-319-93707-6_4 |
2019-01-01 | Chapter 3 describes regenerative chatter in turning. To predict turning behavior, both analytical and numerical analyses are presented. The analytical, frequency domain stability lobe diagram is derived that describes the limiting stable chip width as a function of spindle speed. A time domain simulation is detailed th... | Turning Dynamics | 10.1007/978-3-319-93707-6_3 |
2019-01-01 | In the previous chapters, we determined the natural frequencies and modal shapes for undamped structures when modeled as shear buildings. We also determined the response of these structures using the modal superposition method. In this method, as we have seen, the differential equations of motion are uncoupled by means... | Evaluation of Absolute Damping from Modal Damping Ratios | 10.1007/978-3-319-94743-3_20 |
2019-01-01 | During the last 2 decades, new code generations have been introduced which incorporate the achieved scientific and technological state of the art that has been proven its usefulness in practical application. The Eurocodes and the CICIND model codes are examples of this development. The Eurocode applies a modified gust ... | Structural Oscillations of High Chimneys Due to Wind Gusts and Vortex Shedding | 10.1007/978-3-662-57550-5_6 |
2019-01-01 | This paper is concerned with the asymptotic behavior of the solution to the Euler equations with time-depending damping on quadrant ( x , t ) ∈ ℝ^+ × ℝ^+, $${\partial _t}v - {\partial _x}u = 0,{\partial _t}u + {\partial _x}p\left( v \right) = - \frac{\alpha }{{{{\left( {1 + t} \right)}^\lambda }}}u,$$ ∂ t v − ∂ x u = 0... | Convergence to diffusion waves for solutions of Euler equations with time-depending damping on quadrant | 10.1007/s11425-017-9271-x |
2019-01-01 | This chapter offers an overview of the theoretical foundations and the standard numerical methods for solving structural dynamics problems, with emphasis placed firmly on the latter. Starting with the analysis of single degree of freedom (SDOF) systems both in the time and in the frequency domain, it includes sections ... | Basic Theory and Numerical Tools | 10.1007/978-3-662-57550-5_1 |
2019-01-01 | The primary purpose of this paper is to identify performance indices and evaluate a design of a mono-tube MR damper valve, as a result of which relations among performance indices and possible design approaches are explored. To achieve this, initial design of a mono-tube MR damper valve is considered. Common MR damper ... | Design Evaluation of a Mono-tube Magnetorheological (MR) Damper Valve | 10.1007/978-981-13-2718-6_15 |
2019-01-01 | Frequencies associated with self-excited vibrations are, in most cases, the natural frequencies of the system. The natural frequencies are not proportional to the rotational speed. Therefore, self-excited vibration is a form of non-synchronous vibration. In rotor systems, the lowest natural frequency is often below the... | Case Studies of Self-excited Vibration of Rotor Stability Problems | 10.1007/978-4-431-55453-0_8 |
2019-01-01 | The energy losses generated in rolling element bearings rise with increasing magnitude of the force transmitted between the rotor and the stationary part. A frequently used technological solution, which makes it possible to minimize the transmitted force, consists in adding damping devices to the rotor supports. To ach... | Application of the Controllable Magnetorheological Squeeze Film Dampers for Minimizing Energy Losses and Driving Moment of Rotating Machines | 10.1007/978-3-319-99262-4_10 |
2019-01-01 | Research has shown that the damping of a vibrating structure is highly dependent on its stress function. In this study, the bending stress and damping of wide cantilever beams under free vibration were analyzed using the classical plate and beam theory. The damping stress equation for cantilever beams under free vibrat... | Stress and damping of wide cantilever beams under free vibration | 10.1007/s12206-018-1203-8 |
2019-01-01 | In this paper, we are concerned with the existence of mild solution and controllability for a class of nonlinear fractional control systems with damping in Hilbert spaces. Our first step is to give the representation of mild solution for this control system by utilizing the general method of Laplace transform and the t... | Existence And Controllability For Nonlinear Fractional Control Systems With Damping in Hilbert Spaces | 10.1007/s10473-019-0118-5 |
2019-01-01 | The increasing of operation speed and demand for precision in machinery make lubrication conditions a crucial aspect in order to maximize lifetime of rotor dynamic components. The elastohydrodynamic (EHD) regime more frequently occurs in nonconforming lubricated contacts with local elastic deformation due to high press... | Stiffness and Damping Reduced Model in EHD Line Contacts | 10.1007/978-3-319-99262-4_4 |
2019-01-01 | Timbre is a complex auditory attribute that is extracted from a fused auditory event. Its perceptual representation has been explored as a multidimensional attribute whose different dimensions can be related to abstract spectral, temporal, and spectrotemporal properties of the audio signal, although previous knowledge ... | The Perceptual Representation of Timbre | 10.1007/978-3-030-14832-4_2 |
2019-01-01 | This chapter presents the expanded rod theory developed to simplify dynamic analysis of skyscrapers. This method replaces skyscrapers with a rod having equivalent rigidity and can be used to calculate the analysis considering axial deformation, bending deformation, shear deformation, shear-lag, and torsional deformatio... | Extended Rod Theory | 10.1007/978-981-13-7185-1_4 |
2019-01-01 | The Floating Production Storage and Off-loading (FPSO) vessels are being used widely in offshore industries. The motion of FPSO subjected extreme sea condition needs to be controlled in order to maintain the station keeping of the vessel. The crude oil containers of an FPSO can be utilized as passive dampers for contro... | Response Control of FPSO Using Multiple Tuned Liquid Dampers | 10.1007/978-981-13-3119-0_4 |
2019-01-01 | Interest on numerical models able to estimate the damping capacity of gas bearings has been recently grown up. These models are based on the discretization of Reynolds equation with distributed parameters (DP) or can also be simplified models taking into account a few lumped parameters (LP), which are able to describe ... | Identification of a Lumped Parameters Numerical Model of Gas Bearings: Analysis of 1D Parallel Plates | 10.1007/978-3-030-03320-0_51 |
2019-01-01 | The effects of axial compressive load and internal viscous damping on the free vibration characteristics of Timoshenko beams are carried out using the dynamic stiffness formulation and the differential transformation method. The governing equations of motion are derived using the Hamilton’s principle. After the analyti... | Free Flexural Vibrations of Axially Loaded Timoshenko Beams with Internal Viscous Damping Using Dynamic Stiffness Formulation and Differential Transformation | 10.1007/978-3-319-93157-9_15 |
2019-01-01 | Chapter 2 describes how to use modal analysis, or the study of a system’s dynamic properties in the frequency domain, to describe the tool point dynamics for tool-holder combinations. It first reviews the fundamentals of single and two degree of freedom free and forced vibrations to establish notation conventions for a... | Modal Analysis | 10.1007/978-3-319-93707-6_2 |
2019-01-01 | In the preceding chapter, the free undamped and damped vibration of single degree of freedom systems was discussed, and it was shown that the motion of such systems is governed by homogeneous second-order ordinary differential equations. The roots of the characteristic equations, as well as the solutions of the differe... | Forced Vibration | 10.1007/978-3-319-94271-1_4 |
2019-01-01 | For the past 50 years or so, Kolmogorov’s (1962) correction (K62) to his 1941 hypotheses (K41) has been embraced by an overwhelming majority of turbulence researchers. Our recent work suggests that there are no valid reasons for abandoning K41. In particular, analytical considerations, based on the NS equations, which ... | K41 Versus K62: Recent Developments | 10.1007/978-981-10-7542-1_1 |
2019-01-01 | This paper presents the characterization of a Carbon Fibre Reinforced Plastic (CFRP) and a couple of damping materials, particularly suited to the manufacturing process of composites. Young’s modulus and loss factor of each material are defined by means of the Oberst beam test method, where a specific curve fitting tec... | Composite and Damping Materials Characterization with an Application to a Car Door | 10.1007/978-3-030-03320-0_19 |
2019-01-01 | In this paper, plane strain surface waves, also named generalized Rayleigh surface waves, in a transversely isotropic piezoelectric semiconductor half space are investigated. The governing equations of generalized Rayleigh surface waves include the equations of motion, Gauss’ law of electrostatics and the conservation ... | Generalized Rayleigh surface waves in a piezoelectric semiconductor half space | 10.1007/s11012-019-00944-1 |
2019-01-01 | Organizations follow a certain path or track which they have created in accordance with their strategic planning. Like any other organizational process, the continuous innovation of design is required in order to ensure that it is effectively adapted to changes in the environment, organizational behavior, as well as co... | Organizational Designing | 10.1007/978-3-030-03347-7_5 |
2019-01-01 | Among the problems encountered in rotordynamics, the phenomena of instability generally due to the hydrodynamic bearings and interns damping, the gyroscopic effect due to the discs and shafts, the excitations due to the unbalance as well as the nonlinear phenomena related on the bearings which support the rotor and the... | Dynamic Behavior and Stability of a Flexible Rotor | 10.1007/978-3-319-94616-0_4 |
2019-01-01 | Eccentric shaft-disk system with internal damping driven by a non-ideal power source exhibits Sommerfeld effect characterized by nonlinear jump phenomena of amplitude and rotor speed upon exceeding a critical power input around the critical speed. This effect causes instability in high speed rotors. So the diminution o... | Attenuation of Sommerfeld effect in an internally damped eccentric shaft-disk system via active magnetic bearings | 10.1007/s11012-018-00936-7 |
2019-01-01 | This paper is based on a Search Engine ranking algorithm. It proposes the technique for improving the page rank algorithm. The work focuses on the change in page rank algorithm, which helps in reducing the time complexity. We have calculated the normalized page rank by using the median value as it reduces the calculati... | Improved Google Page Rank Algorithm | 10.1007/978-981-13-2285-3_63 |
2019-01-01 | The laser powder bed fusion AM process has been used to manufacture beams with unique internal geometries that are capable of increasing inherent damping in a part. The concept of the internal design is to have densely packed, unfused powder pockets that dissipate energy via particle interaction. Four Inconel (IN) 718 ... | Forced-Response Verification of the Inherent Damping in Additive Manufactured Specimens | 10.1007/978-3-319-95083-9_15 |
2019-01-01 | Since the first appearance of synchrophasor Synchrophasor measurement technology, it has been playing a fundamental role for many advanced power system monitoring, analysis, and control applications Applications around the world. Phasor measurement unit (PMU) Phasor Measurement Unit (PMU) and wide-area measurement syst... | Use of Synchrophasor Measurement Technology in China | 10.1007/978-3-319-89378-5_5 |
2019-01-01 | Hysteresis and vibration are main factors in reducing the accuracy and the speed of a nanopositioner. In order to improve the positioning accuracy and the speed, a robust adaptive resonant damping control is proposed for trajectory tracking of a nanopositioner system driven by a piezoelectric actuator. Radial basis fun... | Robust Adaptive Resonant Damping Control of Nanopositioning | 10.1007/978-3-030-22808-8_14 |
2019-01-01 | The beam oscillations are modeled by the fourth-order hyperbolic partial differential equation. The minimized functional is the energy integral of an oscillating beam. Control is implemented via certain function appearing in the right side of the equation. It was shown that the solution of the problem exists for any gi... | Numerical Damping of Forced Oscillations of an Elastic Beams | 10.1007/978-3-030-10934-9_20 |
2019-01-01 | Two methods are developed for determining the equivalent aerodynamic damping of reentry vehicle models. In the first method, the equivalent aerodynamic damping is determined on the basis of the experimental envelopes of the transitional process for the angle of attack changing with time; in the second method, all exper... | Methods for determining the equivalent aerodynamic damping of reentry vehicle models tested in a setup with free oscillations | 10.1134/S0869864319010013 |
2019-01-01 | A specific class of rotary machines is the high rotation turbochargers, to automotive application, wherein the shaft is continually subjected to axial forces of different magnitudes due to gas flows in the turbine and the compressor. These forces are supported by axial lubricated thrust bearings. The thrust bearings ar... | Experimental Estimation of Equivalent Damping Coefficient of Thrust Bearings | 10.1007/978-3-319-91217-2_2 |
2019-01-01 | The paper presents free-vibration wind tunnel tests performed at WIST Boundary Layer Wind Tunnel at Ruhr-Universität Bochum (Germany) on a 3D aeroelastic cylindrical model with circular cross-section. The aim of the tests is to validate a model extension to the original spectral method developed by Vickery & Basu, able... | A Model Extension for Vortex-Induced Vibrations | 10.1007/978-3-030-12815-9_33 |
2019-01-01 | Oil-lubricated plain bearings are used widely to support the main rotors of rotating machinery, because the hydrodynamic oil films formed in the bearing clearances can guarantee smooth rotation of shafts and effectively prevent or suppress rotor vibrations. This chapter explains the principles of oil film formation in ... | Basics of Plain Bearings | 10.1007/978-4-431-55453-0_2 |
2019-01-01 | The major problem in forced vibration response is resonance, where the frequencies of exciting forces coincide with the natural frequencies. Rotating machinery has different characteristics in resonance problems from general non-rotating structures. Therefore, the problems need be solved with this knowledge in mind, no... | Case Studies of Forced Vibration Problems of a Rotor | 10.1007/978-4-431-55453-0_7 |
2019-01-01 | Increase in demand for environmental friendly engineered structures make the natural fiber reinforced composites as the best option to synthetic fiber in polymer composite structures. In this study, the influence of stacking sequence of natural hybrid laminates on mechanical and vibration characteristics that are benef... | Influence of Stacking Sequence on Free Vibration Characteristics of Epoxy-Based Flax/Sisal Composite Beams | 10.1007/978-981-13-1780-4_18 |
2019-01-01 | This work examines the distribution of vibration absorber mass for a lumped mass metastructure model designed to suppress vibrations in the axial direction. Metastructures, a metamaterial inspired concept, are structures with distributed vibration absorbers. In automotive and aerospace industries, it is critical to hav... | Lumped Mass Model of a 1D Metastructure with Vibration Absorbers with Varying Mass | 10.1007/978-3-319-74642-5_6 |
2019-01-01 | The vibration-absorbing properties of the plate under the action of a spherical harmonic wave in the soil are studied. In the soil model, an elastic isotropic medium is used. The main goal is to determine the total vector field of accelerations. The mathematical formulation of the problem includes the assignment of the... | Determination of Vibrations at Different Points in the Ground After the Passage of a Spherical Wave Through a Vibration-Absorbing Obstacle | 10.1007/978-3-319-91989-8_86 |
2019-01-01 | The aim of this paper is to derive higher order energy estimates for solutions to the Cauchy problem for damped wave models with time-dependent propagation speed and dissipation. The model of interest is $$\begin{aligned} {\left\{ \begin{array}{ll} u_{tt}-\lambda ^2(t)\omega ^2(t)\varDelta u +\rho (t)\omega (t)u_t=0, &... | The Influence of Oscillations on Energy Estimates for Damped Wave Models with Time-dependent Propagation Speed and Dissipation | 10.1007/978-3-030-26748-3_17 |
2019-01-01 | Large amplitude vibration of mast arm structures due to wind loads are the primary contributing factor to the reduced fatigue life of signal support structures. To alleviate this problem of wind-induced in-plane vibration of mast arm signal structures, a particle-thrust damping based turned mass damper (PTD-TMD) device... | Experimental study of vibration mitigation of mast arm signal structures with particle-thrust damping based tuned mass damper | 10.1007/s11803-019-0500-2 |
2019-01-01 | The damping of steel welded machine tool bodies is usually insufficient in a perspective of functional properties of the machine. Therefore, methods are sought to increase their ability to dissipate energy. One of the solutions is to fill steel welded body with a composite material based on an epoxy resin. Such a struc... | Assessment of the time-varying load influence on damping abilities of steel beams filled with composite material | 10.1007/978-3-030-20131-9_327 |
2019-01-01 | Ships are prone to large roll motions in beam and oblique seas at encounter frequencies near the design frequency of the vessel. The nonlinearity of roll damping and roll motion has been investigated in the past by various researchers. The prediction of roll damping and roll motion of ships becomes difficult by simplif... | Effect of Forward Speed on Roll Damping of a Container Ship Using URANS Simulations | 10.1007/978-981-13-3119-0_12 |
2019-01-01 | Seismic analysis of structures will not be complete without a proper investigation of underlying soil behavior to dynamic loading. Such dynamic behavior is complex in nature due to many influencing parameters. The complex dynamic soil behavior can be represented using the strength and stiffness properties such as low-s... | Dynamic Characterization of Soils Using Various Methods for Seismic Site Response Studies | 10.1007/978-981-13-5871-5_13 |
2019-01-01 | In this paper, a damping estimation method based on distribution of zero-crossing times and its applications are presented. The method is empirically derived and it is based on Rice distribution operating on probability distribution of zero-crossings. The method’s assertion is that a relationship exists between said pr... | A Distribution-Based Damping Estimation Method for Random Vibration Response and Its Applications | 10.1007/978-3-319-74793-4_24 |
2019-01-01 | In mechanical systems, the mechanical power is often provided by an electric motor. This power is supplied to a load by means of a shaft or a mechanical transmission that is made of steel. Despite the mechanical strength of steel, flexibility becomes a significant phenomenon when large loads are present. This situation... | Control of a Servomechanism with Flexibility | 10.1007/978-3-319-75804-6_12 |
2019-01-01 | Magnetorheological fluid is a smart material which can change its viscosity in milliseconds depending on the magnetic field applied. This brings a great advantage to create variable damping ability if it is used in an absorber. The stiffness of the absorber can be manipulated by an external magnetic field which effects... | Coupled Magnetic and CFD Modelling of a Structural Magnetorheological Vibration Absorber with Experimental Validation | 10.1007/978-3-319-89911-4_9 |
2019-01-01 | Higher demands on the dynamic behavior of feed drives of machine tools require better system identification methods to identify the controlled system to optimize better controllers. Most modern CNC systems have still simple PI-controllers for speed and current loop and a P-controller with further filters for the positi... | Automatic System Identification of Forward Feed Drives in Machine Tools | 10.1007/978-3-030-03451-1_15 |
2019-01-01 | The aim of this study is to obtain information about the influence of cross section changes to dynamic behavior of vibrating beam. It was found that location of the changed cross sections influences energy dissipation in the structure and could be used for damping structural vibrations. The contacting interaction of st... | Vibration peculiarity of impacting variable cross section cantilever structure | 10.1007/978-3-030-20131-9_416 |
2019-01-01 | Due to increase in the rate of occurrence of earthquakes and associated damages, site-specific dynamic models are attracted to research in the recent past. The shear modulus degradation curve, damping characteristics and shear wave velocity profile are indispensable input properties required for carrying out the site r... | Dynamic Properties of Surface Liquefied Site Silty-Sand of Tripura, India | 10.1007/978-3-030-01920-4_12 |
2019-01-01 | In this work, we explore the possibilities of passive damping the resonance vibrations of a cantilevered duralumin plate located on the free surface of a quiescent fluid. The harmonic excitation with a specified frequency is provided by the electromagnetic field, which is generated under a combined action of a light ne... | Damping of Hydroelastic Vibrations of the Plate Using Shunted Piezoelectric Element. Part II: Experiment | 10.1007/978-3-030-21894-2_64 |
2019-01-01 | Gas foil Bearing (GFB) are oil-free, high-speed and light bearings, which work according to the principle of fluid film lubrication. Thanks to their elastic structure, GFBs are able to compensate for minor pressure changes in the lubrication films. This paper presents the experimental structural analysis of first-gener... | Experimental Structural Analysis of Gas Foil Bearings | 10.1007/978-3-319-99262-4_19 |
2019-01-01 | This [aut] Huss, M. paper [aut] Kuttenkeuler, J. presents [aut] Werner, S. unique [aut] Soder, C, -J. experimental set-ups in model scale and full scale for evaluating roll damping Roll damping properties of a Panamax Pure Car and Truck Carrier at speed. The purpose of this study is to develop a method for the assessme... | Assessment of Ship Roll Damping Through Full Scale and Model Scale Experiments and Semi-empirical Methods | 10.1007/978-3-030-00516-0_10 |
2019-01-01 | Owing to the growth in human population, the land-scarce island countries and countries with long coastline are expanding their horizon to ocean environment through very large floating structures (VLFS) for different purposes as these are cost-effective, environment-friendly and can be manufactured easily. VLFS applica... | Hydroelastic Responses of a Pontoon-Type VLFS in Different Water Depths | 10.1007/978-981-13-3119-0_18 |
2019-01-01 | One of the main concerns in using commercial software for finite element analyses of dam-foundation-reservoir systems is that the simplifying assumptions of the massless foundation are unreliable. In this study, an appropriate direct finite element method is introduced for simulating the mass, radiation damping and wav... | Seismic analysis of dam-foundation-reservoir system including the effects of foundation mass and radiation damping | 10.1007/s11803-019-0499-4 |
2019-01-01 | Dry-friction damping effect to reduction of self-excited vibrations due to aero-elastic instability is studied on numerical reduced model of rotating turbine wheel with 30 blades. The aerodynamic excitation arises from the spatially periodical flow of steam through the stator blades cascade. Dry friction contact dampin... | Study of dry-friction damping effect on two simplified models of flutter oscillations | 10.1007/978-3-030-20131-9_337 |
2019-01-01 | With the increase of wind power installed capacity, research on the dynamic behavior and stabilization mechanism of the power system has had a certain impact. Frequent small disturbances will affect system stability and cause huge economic losses. In this context, based on the concept and analysis method of small signa... | Influence of Wind Farm Access on System Small Signal Stability | 10.1007/978-981-13-5841-8_12 |
2019-01-01 | The reliable guided wave inspection techniques depend on the accurate understanding of dispersive properties. The classic finite element method has been proven to be very practical for modeling wave propagation in arbitrary waveguides. However, when it comes to modeling on complex geometries, it still has a major drawb... | Wave isogeometric analysis method for calculating dispersive properties of guided waves in rotating damped cylinders | 10.1007/s11012-018-0921-4 |
2019-01-01 | The adoption of wind turbines to produce electric energy nowadays represents one of the most promising alternatives to the use of the exhausting fossil fuel stocks. The actual tendency is toward the design of taller towers that can produce more power because excited by stronger winds. There is the need of designing the... | Mitigation of Structural Demand to Wind Turbines: Experimental Investigation of Three Control Strategies | 10.1007/978-3-030-12815-9_14 |
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