publicationDate stringlengths 10 10 | abstract stringlengths 0 37.3k | title stringlengths 1 5.74k | doi stringlengths 11 47 ⌀ |
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2014-01-01 | The first step for performing a dynamic analysis is to set up the equations of motions. We start with Newton’s second law, which is followed by the virtual work principle (D’Alembert’s principle), Hamilton’s principles, and Lagrange’s equations. We shall also see the important role of energy in the study of dynamic ana... | Governing Equation of Motions | 10.1007/978-3-642-37003-8_2 |
2014-01-01 | A parameterized modal analysis is proposed to evaluate power system small-signal stability and a simulation procedure using DIgSILENT programming language (DPL) is presented for this purpose. Modal analysis, or small-signal stability analysis, refers to the ability of a system to withstand small perturbations around an... | Parameterized Modal Analysis Using DIgSILENT Programming Language | 10.1007/978-3-319-12958-7_10 |
2014-01-01 | In this chapter, the supplemental passive energy dissipation devices, metallic or hysteretic dampers, frictional, viscoelastic and viscous (linear and non-linear) dampers, developed and studied over the years, are briefly described. For each type of device, the physical, mechanical and technological aspects are analyse... | Passive Energy Dissipation Devices | 10.1007/978-3-319-02615-2_2 |
2014-01-01 | This chapter addresses the seismic performance of Tuned Mass Dampers (TMDs). In the design of a TMD, two types of uncertainty are relevant: the stochastic excitation modeling the earthquake, and the inherent uncertainty of internal parameters of the damping device and the subsoil. Modeling the excitation by a continuou... | Seismic Performance of Tuned Mass Dampers with Uncertain Parameters | 10.1007/978-3-319-05933-4_3 |
2014-01-01 | The main aim of this paper is to focus on dynamics of the electromechanical system flexibly coupled with a baseplate and damped by an impact element. The model is constructed with three degrees of freedom in the mechanical oscillating part, two translational and one rotational. The system movement is described by three... | Dynamics and Efficiency of an Impact Damper | 10.1007/978-3-319-07401-6_35 |
2014-01-01 | This paper presents performance analysis of a controllable electro-rheological (ER) damper for a passenger vehicle with different tire pressure. In order to achieve this research goal, an ER damper, which satisfies design specifications for a mid-sized passenger vehicle, is designed and manufactured. After experimental... | Performance Analysis of Passenger Vehicle Featuring ER Damper with Different Tire Pressure | 10.1007/978-3-319-13966-1_39 |
2014-01-01 | Running turbines are exposed to high mechanical load. Due to gas excitations the structure can vibrate with high oscillation amplitudes which can damage the turbine blades. Mistuning can additionally lead to high local stresses which must be taken into account in the turbine design process. Introducing damping due to f... | Consideration of Interface Damping in Shrouded Mistuned Turbine Blades | 10.1007/978-3-319-04501-6_9 |
2014-01-01 | The development and application of heuristic optimization algorithms have gained a renewed interest due to the limitations of classical optimization tools for tackling several hard-to-solve problems in different engineering fields. Due to the complex nature of power system dynamics, electrical engineering optimization ... | Mean–Variance Mapping Optimization Algorithm for Power System Applications in DIgSILENT PowerFactory | 10.1007/978-3-319-12958-7_12 |
2014-01-01 | The design of modern day offshore wind turbines (OWTs) relies on numerical models, which are used for simulating the dynamic behavior in different operational and environmental conditions. From these results one can estimate ultimate and fatigue loads, which are needed for determining the design life of the turbines. T... | Identifying Structural Parameters of an Idling Offshore Wind Turbine Using Operational Modal Analysis | 10.1007/978-3-319-04546-7_31 |
2014-01-01 | The affinity propagation clustering is a new clustering algorithm. The volatility is introduced to measure the degree of the numerical oscillations. The research focuses on two main parameters of affinity propagation: preference and damping factor, and considers their relation with the numerical oscillating and volatil... | Research on Parameters of Affinity Propagation Clustering | 10.1007/978-94-007-7262-5_72 |
2014-01-01 | Seismic evaluation plays an important role in performance based seismic engineering (PBSE). The modal system is the basis of structural dynamics, which is closely associated with PBSE. This paper shows that the modal system is not necessary to be a single-degree-of-freedom oscillator. Actually, a modal system with thre... | Theory and Applications of the 3-DOF Modal System for PBSE of Asymmetrical Buildings | 10.1007/978-94-017-8875-5_18 |
2014-01-01 | The jointed structures are widely spread but their behaviour is quite hard to model and to simulate. The talk deals with a decomposition in linear and non-linear substructures that allows to make the simulations easier. The authors show that the modal subspace is not optimal to reduce the order of the model. Another ch... | Model Reduction and Lumped Models for Jointed Structures | 10.1007/978-3-319-04501-6_26 |
2014-01-01 | Because of its minor environmental impact, electricity generation using wind power is getting remarkable. The further growth of the wind industry depends on technological solutions to the challenges in production and construction of the turbines. Wind turbine tower vibrations, which limit power generation efficiency an... | Vibration Mitigation of Wind Turbine Towers with Tuned Mass Dampers | 10.1007/978-3-319-08413-8_12 |
2014-01-01 | In this paper, we employ non–sampling techniques based on the generalized polynomial chaos (gPC) expansions to numerical simulation of damped vibration problems including random material and damping parameters. A general stochastic finite element method (SFEM) formulation is presented for damped linear structural vibra... | Stochastic FEM to Structural Vibration with Parametric Uncertainty | 10.1007/978-3-319-06331-7_20 |
2014-01-01 | In this chapter, the principal elements of the dynamic response of linear undamped and damped single and multi degrees-of-freedom systems are described in time domain both in terms of the relative motions of the mass and in state space form. In a first stage, the analysis of the dynamic response of linear simple-degree... | Dynamic Response of Systems Equipped with Viscous and Viscoelastic Dampers | 10.1007/978-3-319-02615-2_3 |
2014-01-01 | This chapter introduces active and semi-active control systems. We first describe the fundamental differences between active and passive systems. Then, the importance of feedback, computational requirements, and system modelling for active control are discussed. This material is followed by an introductory example invo... | Applications of Active Control | 10.1007/978-3-319-06281-5_7 |
2014-01-01 | On structures two types of humans may be present. (1) Active humans and (2) passive humans (sitting or standing on the structure). The active humans can excite the structure and cause structural vibrations. The mass of the passive humans will interact with the structure and basically it changes the structural system (m... | Interaction Between Humans and Structures | 10.1007/978-3-319-04546-7_15 |
2014-01-01 | The Laboratory of Building Physics (LFC) has been developed an important research about air drying technologies applied to buildings treatment. In the last years it was validated and experimentally analysed the operating principle of a technique called “Wall Base Ventilation System” initially developed for the treatmen... | Air Drying Technologies Applied to Buildings Treatment | 10.1007/978-3-319-04531-3_1 |
2014-01-01 | A semi-active (SA) control system based on the use of smart magnetorheological (MR) dampers to control the structural response of a wind turbine is proposed herein. The innovative approach is based on the implementation and use of a variable-properties base restraint. This is able to modify in real time its mechanical ... | A Semi-active Control System for Wind Turbines | 10.1007/978-3-319-08413-8_13 |
2014-01-01 | This paper presents experimental testing and evaluation of a prototype magnetorheological (MR) damper. An MR device fills the gap between purely passive and fully active control systems as it offers a reliability of passive systems, and yet it maintains the versatility and adaptability of the fully active devices. The ... | Experimental Testing and Evaluation of a Prototype Magnetorheological Damper | 10.1007/978-81-322-1859-3_9 |
2014-01-01 | Improving ride quality is a paramount concern for road cyclists who are subjected to road induced vibrations during long rides. It has been hypothesized that adding structural damping to the bicycle can decrease the vibration levels transmitted to the cyclist. The human body is most sensitive to vibrations in the frequ... | Effect of Structural Damping on Vibrations Transmitted to Road Cyclists | 10.1007/978-3-319-04753-9_29 |
2014-01-01 | This paper deals with semi-active vibration reduction by means of piezo-actuators shunted to time-variant impedances. Particularly, attention is focused on the Synchronized Switch Damping on Inductance technique applied to single mode control in presence of a random disturbance. Drawbacks of the mentioned method are ev... | SSDI Technique Evolution to Improve Attenuation Performances with Random Disturbances | 10.1007/978-1-4614-6585-0_10 |
2014-01-01 | Sea vessels are exposed to a complex vibration environment, influenced by the sea as well as by operational conditions. Particularly, the hydrodynamic load effects are difficult to estimate analytically. Experimental results are therefore important to verify the analytical models. In the present paper preliminary resul... | Modal Test Results of a Ship Under Operational Conditions | 10.1007/978-3-319-04774-4_20 |
2014-01-01 | The characterization of torsional vibrations in rotating machinery is of major importance to ensure reliability. Excessive torsional vibrations can cause wear and even breakdown. At a constant operating speed, risks are generally diminished by avoiding coincidence with torsional natural frequencies. This becomes virtua... | Torsional Damping Identification in Rotating Machinery | 10.1007/978-3-319-04753-9_13 |
2014-01-01 | The elevated specific strength of fiber reinforced plastics (FRP) is the prominent drive for their ever-growing applications. Their inadequate vibrational damping properties prevent them from replacing conventional metal alloys for certain structural applications. In this study we attempt to utilize a low temperature h... | Superior Damping of Hybrid Carbon Fiber Composites Grafted by ZnO Nanorods | 10.1007/978-1-4614-6585-0_18 |
2014-01-01 | The main problem of torsion balance measurements is the long damping time however it is possible to significantly reduce the observation time by modern technology. The damping curve can be precisely determined by CCD sensors as well as computerized data collection and evaluation. The first part of this curve makes it p... | Reducing the Measurement Time of the Torsion Balance | 10.1007/978-3-642-37222-3_45 |
2014-01-01 | Modal correlation of test and analytical data is an important step in system identification and model updating. The Frequency Response Assurance Criterion (FRAC) is one of the metrics that can be used to quantify the strength of correlation between the test and analytical degrees of freedom (DOF). To calculate FRAC for... | Techniques for Synthesizing FRFs from Analytical Models | 10.1007/978-3-319-04729-4_7 |
2014-01-01 | The paper addresses analytical, numerical and experimental aspects of the design of controlled fluid damper. The mathematical model served the development of a numerical model in MATLAB/Simulink environment. The selected important aspects of the tracked vehicles dynamic modelling process related to dynamics of the driv... | Tuning the Dynamic Characteristics of Tracked Vehicles Suspension Using Controllable Fluid Dampers | 10.1007/978-3-319-04624-2_15 |
2014-01-01 | Accumulating data indicates that following anti-cancer treatments, cancer cell death can be perceived as immunogenic or tolerogenic by the immune system. The former is made possible due to the ability of certain anti-cancer modalities to induce immunogenic cell death (ICD) that is associated with the emission of damage... | Danger signalling during cancer cell death: origins, plasticity and regulation | 10.1038/cdd.2013.48 |
2014-01-01 | Stroke is among the most common diseases of advanced age and is becoming a steadily increasing financial healthcare problem in the industrialized world with the increasing longevity and aging of the population. The incidence of ischemic stroke is highest in the elderly population, representing one of the most common ca... | Neuroinflammation and Immune Regulation in Ischemic Stroke: Identification of New Pharmacological Targets | 10.1007/978-1-4939-1071-7_11 |
2014-01-01 | Active vibration control technologies are reaching maturity in many applications, in both periodic and transient operating regimes. Historically these systems have been designed without regard for the power they consume, which is not only inefficient and costly, but limits their adoption in applications where it is imp... | A Regenerative Approach to Energy Efficient Hydraulic Vibration Control | 10.1007/978-3-319-04729-4_17 |
2014-01-01 | Fluid-flow around mechanical structures can sometimes lead to catastrophic failures. Improved modelling of fluid/structure interaction is required for safety and mechanical considerations. In this contribution, concepts for modelling the interaction of structures and fluids are presented. Starting from excitation mecha... | Modelling of Fluid-Structure Interaction – Effects of Added Mass, Damping and Stiffness | 10.1007/978-3-7091-1809-2_5 |
2014-01-01 | This paper introduces a novel type of passive control system designed to suppress unwanted vibrations in civil engineering structures subjected to base and lateral excitation. The new system configuration, inspired by traditional tuned mass dampers (TMD) where the mass element has been replaced with an inerter is prese... | Design and Performance Analysis of Inerter-Based Vibration Control Systems | 10.1007/978-3-319-04546-7_53 |
2014-01-01 | The theory of optimal control is concerned with operating a linear dynamic system at a minimum cost. It also provides the best possible performance with respect to given measure of performance index. This paper presents the design of an optimal control law for yaw damper of an aircraft model. This modern controller bas... | Design of an Optimal Yaw Damper for 747 Jet Aircraft Model | 10.1007/978-81-322-1157-0_81 |
2014-01-01 | The dynamical response of systems with shape memory alloy (SMA) or magnetorheological damper (MRD) presents a different behavior due to their nonlinear characteristics. Both systems have a nonlinear behavior due to adaptive dissipation related to their hysteretic behavior. This property is very attractive in engineerin... | Influence of Smart Material on the Dynamical Response of Mechanical Oscillator | 10.1007/978-3-319-08266-0_37 |
2014-01-01 | This Chapter investigates the statistical properties of residual errors induced by POD-based reduced order modeling. Such errors enter into the state space equations of the reduced systems in terms of system evolution and observation noise. A fundamental assumption made by recursive Bayesian filters, as exploited in th... | POD-Kalman Observer for Linear Time Invariant Dynamic Systems | 10.1007/978-3-319-02559-9_4 |
2014-01-01 | This paper explores the optimisation technique of Damped Least Square Method also known as the Levenberg-Marquardt (LM) Algorithm for Iris recognition. The motive behind it is to show that even though there are many algorithms available which act as an alternative to the LM algorithm such as the simple gradient decent ... | Optimisation Using Levenberg-Marquardt Algorithm of Neural Networks for Iris | 10.1007/978-3-319-02931-3_12 |
2014-01-01 | This chapter discusses the dynamics of a mass–damper–spring system with two rigid constraints and impact interactions. Impacting chatter and stuck phenomena are investigated for the mass with constraints and the corresponding conditions for such phenomena are determined. Analytical predictions are presented for the sys... | Analytical Dynamics of a Mass–Damper–Spring Constrained System | 10.1007/978-3-319-01411-1_18 |
2014-01-01 | The present paper shall give some ideas to protect power plant machinery against seismic demands. The elastic support of turbine foundations, fans, boiler feed pumps and coal mills is a well-accepted strategy for the dynamic uncoupling from their substructures and for the vibration isolation. If the corresponding beari... | Strategies for the Seismic Protection of Power Plant Equipment | 10.1007/978-3-658-02810-7_14 |
2014-01-01 | This paper aims at analyzing the shapes of the bounded traveling wave solutions for a class of nonlinear wave equation with a quintic term and obtaining its damped oscillatory solutions. The theory and method of planar dynamical systems are used to make a qualitative analysis to the planar dynamical system which the bo... | Shape analysis and damped oscillatory solutions for a class of nonlinear wave equation with quintic term | 10.1007/s10483-014-1777-7 |
2013-12-01 | By a special layout of the damper in a vibration isolation system, the velocity- n th power damping of the damper can be transformed into the velocity-displacement dependent damping in the moving direction due to geometric nonlinearity. This study is mainly concerned with the mechanism of this geometric nonlinear dampi... | Study on the force transmissibility of vibration isolators with geometric nonlinear damping | 10.1007/s11071-013-1027-0 |
2013-12-01 | We analyze the convergence to equilibrium of solutions to the nonlinear Berger plate evolution equation in the presence of localized interior damping (also referred to as geometrically constrained damping ). Utilizing the results in (Geredeli et al. in J. Differ. Equ. 254:1193–1229, 2013 ), we have that any trajectory ... | Decay Rates to Equilibrium for Nonlinear Plate Equations with Degenerate, Geometrically-Constrained Damping | 10.1007/s00245-013-9210-8 |
2013-12-01 | This paper presents results from an extensive set of frequency response measurements from a simple plate structure with a single bolt lap joint. The frequency response measurements are obtained from modal impact tests. Both damping ratios and natural frequencies are found to remain fairly constant for medium to high le... | Effect of Fastener Preload on Structural Damping | 10.1007/s11668-013-9740-z |
2013-12-01 | This paper proposes a new scheme for piezoelectric energy harvesting maximization. The proposed enhancement relies on a new topology of splitting a specified dimension piezo composite bender into beams with smaller width and, therefore, higher quality factor (or Q factor). The increase of Q factor allows a much more ef... | Increasing the output from piezoelectric energy harvester using width-split method with verification | 10.1007/s12541-013-0291-8 |
2013-12-01 | Studies in the past focused on the implementation of semi-passive damping techniques that could significantly reduce structural vibration. Recently, the performances of these damping techniques have been enhanced by artificially increasing the voltage amplitude delivered by the piezoelectric patches with an external vo... | Semi-passive piezoelectric structural damping based on a pulse-width modulation switching circuit | 10.1007/s12206-013-0906-0 |
2013-12-01 | Based on dynamic triaxial test, the mechanical properties of the weathered rock covered by loess were studied. The cohesion value of weathered mudstone is far below that of the weathered sandstone, while the internal friction angle values are basically equivalent, about 30°. Compared with the undisturbed sample, the co... | Experimental study on mechanical properties of weathered rock covered by loess | 10.1007/s12204-013-1455-5 |
2013-12-01 | The effectiveness of viscous dampers in mitigating the seismic excitation impacts upon building structures has been widely proved. Recently, with reference to the specific case of equal mass, equal stiffness, shear-type structures, the authors developed a direct practical procedure which gives the mechanical characteri... | On the dimensioning of viscous dampers for the mitigation of the earthquake-induced effects in moment-resisting frame structures | 10.1007/s10518-013-9474-z |
2013-12-01 | This paper presents a hybrid active power filter (HAPF) comprising an active resistive damper (ARD). The ARD consists of three resistances connected to the grid through three bi-directional electronic switches (IGBTs). The ARD can rapidly damp over voltages or over currents under resonance conditions, when the active p... | Using an active resistive damper in hybrid active power filter to avoid resonance over-voltage | 10.1007/s00202-012-0256-4 |
2013-12-01 | This paper deals with the analysis of active constrained layer damping (ACLD) of geometrically nonlinear transient vibrations of skew laminated composite plates using skew or rectangular patches of the ACLD treatment. The constraining layer of the patch of the ACLD treatment is composed of the vertically/obliquely rein... | Control of geometrically nonlinear vibrations of skew laminated composite plates using skew or rectangular 1–3 piezoelectric patches | 10.1007/s10999-013-9224-z |
2013-12-01 | It is proposed here to use a robust tracking design based on adaptive fuzzy control technique to control a class of multi-input-multi-output (MIMO) nonlinear systems with time delayed uncertainty in which each uncertainty is assumed to be bounded by an unknown gain. This technique will overcome modeling inaccuracies, s... | Robust tracking design based on adaptive fuzzy control of uncertain nonlinear MIMO systems with time delayed states | 10.1007/s12555-012-0543-x |
2013-12-01 | The damping-induced self-recovery phenomenon refers to the fundamental property of underactuated mechanical systems: if an unactuated cyclic variable is under a viscous damping-like force and the system starts from rest, then the cyclic variable will always move back to its initial condition as the actuated variables c... | On the Damping-Induced Self-Recovery Phenomenon in Mechanical Systems with Several Unactuated Cyclic Variables | 10.1007/s00332-013-9177-2 |
2013-12-01 | The integration of large amount of wind power into a power system imposes a new challenge for the secure and economic operation of the system. It is necessary to investigate the impacts of wind power generation on the dynamic behavior of the power system concerned. This paper investigates the impacts of large amount of... | Small signal stability analysis of power systems with high penetration of wind power | 10.1007/s40565-013-0028-9 |
2013-12-01 | The model, experimental equipment, and test program are briefly described. A method of determining the aerodynamic characteristics of the model on the facility with free oscillations is presented. Aerodynamic derivatives of the pitching moment of the model are obtained for two positions of the axis of rotation and Mach... | Aerodynamic derivatives of the model of the jettisonable module of the emergency rescue system at hypersonic velocities | 10.1134/S0869864313060103 |
2013-12-01 | This paper introduces the design of a new combination of friction/hysteretic damper installed in the middle of cross bracing for dissipating seismic energy. Due to its relative simplicity and easy application, with no need for any special material or technology, this high-performance system has gained more attention th... | A hybrid friction-yielding damper to equip concentrically braced steel frames | 10.1007/s13296-013-4001-2 |
2013-12-01 | The aim of this study was to determine how the violinist robot could produce a good quality of violin sounds. We began our study with the basic physics of producing sound with a violin. We found three parameters that influenced the quality of the sound produced by the violin; the bowing force, the bowing velocity and t... | Improvement of Violinist Robot using a Passive Damper Device | 10.1007/s10846-012-9799-x |
2013-12-01 | For a large floating vessel in waves, radiation damping is not an accurate prediction of the degree of roll unlike other degrees of freedom motion. Therefore, to get the knowledge of roll motion performance of deepwater pipelay crane vessels and to keep the vessel working safety, the paper presents the relationship bet... | Roll motion analysis of deepwater pipelay crane vessel | 10.1007/s11804-013-1217-7 |
2013-12-01 | Improvement in mechanical damping of SBR-modified cement pastes had been evaluated by dynamic mechanical analyzer. Specimens were fabricated and tested under 3-point flexure clamp at frequencies of 0.5–50 Hz or temperatures of −30 to 70 °C. Significant improvement in damping was observed in cementitious-SBR composite s... | Study of the mechanical damping behavior of SBR-modified cement pastes by dynamic mechanical analyzer | 10.1007/s10973-013-3165-5 |
2013-12-01 | The present paper studies the forced damped pendulum equation, equipped with Hubbard’s parameters (Hubbard in Am Math Mon 8:741–758, 1999 ). With the aid of rigorous computations, his 1999 conjecture on the existence of chaos was proved in Bánhelyi et al. (SIAM J Appl Dyn Syst 7:843–867, 2008 ) but the problem of findi... | An optimization technique for verified location of trajectories with prescribed geometrical behaviour in the chaotic forced damped pendulum | 10.1007/s10100-012-0256-5 |
2013-11-19 | We study oscillatory behavior of a class of second-order differential equations with damping under the assumptions that allow applications to retarded and advanced differential equations. New theorems extend and improve the results in the literature. Illustrative examples are given. MSC: 34C10, 34K11. | Oscillation of second-order damped differential equations | 10.1186/1687-1847-2013-326 |
2013-11-11 | Shear wall has been considered as a major lateral load-resisting element inmultistoried building located in wind- or earthquake-prone zone. The behavior ofshear wall under various loading conditions has been the subject of intenseresearch for the last few decades. The behavior of shear walls without openingsis complete... | Nonlinear finite element dynamic analysis of squat shear wall with openings | 10.1186/2008-6695-5-27 |
2013-11-07 | In this paper, by using the mountain pass theorem, we investigate the existence of subharmonic weak solutions for a class of second-order impulsive Lagrangian systems with damped term under asymptotically quadratic conditions. Some new existence criteria are established. Finally, an example is presented to verify our r... | Subharmonic solutions for a class of second-order impulsive Lagrangian systems with damped term | 10.1186/1687-2770-2013-218 |
2013-11-01 | Interaction of a moving body with a compressible fluid is considered in light of electrodynamic analogies. For a sphere-shaped body, the “relativistic” correction to the added mass and radiation damping force is calculated. Motion with small velocities, as well as the case of near-sonic motion, is considered. For compa... | Radiation damping and acoustic relativism of a solid body motion through a compressible medium | 10.1134/S1063771013060055 |
2013-11-01 | The discontinuous deformation analysis (DDA) is a numerical method for modeling discontinuous deformation behaviour of jointed rocks. In this paper, two basic problems are discussed related to kinetic energy dissipation and the convergence criterion for the DDA method when it is applied to geotechnical engineering. In ... | Kinetic Energy Dissipation and Convergence Criterion of Discontinuous Deformations Analysis (DDA) for Geotechnical Engineering | 10.1007/s00603-012-0356-5 |
2013-11-01 | In this paper, we study the dissipative dynamics of the phase damped Jaynes–Cummings model with gravity under Markovian approximation in the presence of the Lamb shift parameter. The model consists of a moving two-level atom simultaneously exposed to the gravitational field and a single-mode traveling radiation field i... | Influence of Lamb Shift Parameter on Dissipative Dynamics of the Phase Damped Jaynes–Cummings Model with Gravity Under Markovian Approximation | 10.1007/s10773-013-1704-2 |
2013-11-01 | The coupled problem of the forced axially symmetric vibrations and self-heating of clamped and hinged flexible circular plates with viscoelastic piezoelectric layers as sensors and actuators is solved. The mechanical and electric excitation of vibrations and the damping of mechanical vibrations by applying the appropri... | Forced Monoharmonic Vibrations and Self-Heating of Viscoelastic Flexible Circular Plates with Piezoelectric Layers | 10.1007/s10778-013-0605-7 |
2013-11-01 | For the inverse vibration problem, a differential-algebraic equation (DAE) method is proposed to simultaneously estimate the time-dependent damping and stiffness coefficients by using two sets of displacement and velocity as input data. We combine the equations of motion and the supplemental data into a set of DAEs. We... | An iterative
$\mathit{GL}(n,\mathbb{R})$
method for solving non-linear inverse vibration problems | 10.1007/s11071-013-0997-2 |
2013-11-01 | The dynamics of a circular film membrane with attached current-carrying conductors in zero gravity is studied. Equations are derived which describe the vibrations of the membrane stabilized by the Ampère force. The spectrum of natural vibrations and their corresponding strains are calculated. Constrained vibrations of ... | Vibrations of a frameless film membrane stabilized by the Ampère force in zero gravity | 10.1134/S0021894413060035 |
2013-11-01 | In this paper, the asymptotic stability with probability one of multi-degree-of-freedom (MDOF) nonlinear oscillators with fractional derivative damping parametrically excited by Gaussian white noises is investigated. A stochastic averaging method and the Khasminskii’s procedure are employed to evaluate the largest Lyap... | Asymptotic stability with probability one of MDOF nonlinear oscillators with fractional derivative damping | 10.1007/s11433-013-5053-1 |
2013-11-01 | A number of interesting phenomena at fluid-solid interfaces can be observed when the incident angle approaches the Rayleigh angle, including Schoch displacement and leaky Rayleigh waves. Besides the experimental and theoretical research on these problems, numerical tools have been more and more widely used for these co... | Numerical simulation of ultrasonic minimum reflection for residual stress evaluation in 2D case | 10.1007/s12206-013-0843-y |
2013-11-01 | Methods of calculating processes of discharge and suction in a displacement pump with gas damper are developed and the basic results of calculations of suction and discharge pressure in the working cavity of a pump as a function of the turning angle of the crankshaft (disregarding or based on the speed of the fluid) ar... | Mathematical Modeling of Processes of Suction and Discharge in a Displacement Pump with Gas Damper | 10.1007/s10556-013-9774-9 |
2013-10-17 | Background Passive prosthetic devices are set up to provide optimal function at customary walking speed and thus may function less effectively at other speeds. This partly explains why joint kinetic adaptations become more apparent in lower-limb amputees when walking at speeds other than customary. The present study de... | Walking speed related joint kinetic alterations in trans-tibial amputees: impact of hydraulic 'ankle’ damping | 10.1186/1743-0003-10-107 |
2013-10-01 | A new model for a smart shell of revolution treated with active constrained layer damping (ACLD) is developed, and the damping effects of the ACLD treatment are discussed. The motion and electric analytical formulation of the piezoelectric constrained layer are presented first. Based on the authors’ recent research on ... | Modeling and Dynamics Analysis of Shells of Revolution by Partially Active Constrained Layer Damping Treatment | 10.1016/S0894-9166(13)60042-7 |
2013-10-01 | The joint interface plays a significant role in machine tools and other machineries. A novel type of joint which consists of oily porous material was proposed. The equivalent stiffness and damping of oily porous joint could be divided into solid and liquid parts, and the two parts are shunt connection. Theoretically, t... | A fractal model of normal dynamic parameters for fixed oily porous media joint interface in machine tools | 10.1007/s00170-013-4825-0 |
2013-10-01 | A new boundary element (BEM) formulation is proposed for wave load analysis of submerged or floating bodies. The presented formulation, through establishing an impedance relation, permits the evaluation of the hydrodynamic coefficients (added mass and damping coefficients) and the coefficients of wave exciting forces s... | A new boundary element formulation for wave load analysis | 10.1007/s00466-013-0846-7 |
2013-10-01 | In this paper, stability and bifurcations in a simply supported rotating shaft are studied. The shaft is modeled as an in-extensional spinning beam with large amplitude, which includes the effects of nonlinear curvature and inertia. To include the internal damping, it is assumed that the shaft is made of a viscoelastic... | Dynamic stability and bifurcation of a nonlinear in-extensional rotating shaft with internal damping | 10.1007/s11071-013-0974-9 |
2013-10-01 | A long-span structure is a common type of public building, but its seismic characteristics are distinct from other types of buildings because of its long span. Calculation models considering multi-point excitation are required in the seismic analysis of long-span structures. However, correlative studies have already cl... | Possible existing seismic analysis errors of long span structures and bridges while utilizing multi-point earthquake calculation models | 10.1007/s10518-013-9462-3 |
2013-10-01 | The dynamic mechanical properties of high density polyethylene (HDPE) and teak wood flour (TWF) composites at varying volume fraction ( Φ _f) of TWF from 0.00 to 0.32 have been studied. In HDPE/TWF composites, storage modulus ( E ′) decreased at Φ _f = 0.05, then increases with Φ _f; however, values were lower than HDP... | Dynamic mechanical properties of high density polyethylene and teak wood flour composites | 10.1007/s00289-013-0941-0 |
2013-09-01 | In this paper, the possibility of the development of a new kind of low frequency shaker was discussed. In order to prove the possibility, a series of tests was performed using a direct-made experimental setup which contains a metal plate, springs and varying dampers. The frequency of the harmonic force variation and da... | Development of a low frequency shaker using MR dampers | 10.1007/s12541-013-0222-8 |
2013-09-01 | An ideal model of two immiscible liquids is analyzed, the lower of which is viscous and the upper one, moving with a constant velocity parallel to the interface, is ideal. It is shown that, in the linear approximation, the role of the viscosity of the two liquids results in the decrement of the damping of waves on the ... | On the role of the viscosity of liquids in the realization of Kelvin-Helmholtz instability | 10.3103/S1068375513050116 |
2013-09-01 | Dowel and screw connections in timber structures behave nonlinearly, even at loads which would be experienced in a structure in normal service. They exhibit hysteresis and creep as a result of both the viscoelastic behaviour of the timber itself and the frictional interaction between the timber and connecting elements,... | Viscoelastic embedment behaviour of dowels and screws in timber under in-service vibration | 10.1007/s00107-013-0720-5 |
2013-09-01 | This article describes the results of an investigation concerning the power absorbed at mechanical resonance for a single degree of freedom vibration system. Regarding the experimental purposes, the article proposes a cantilever beam set-up actuated by a voice-coil actuator and a computer-aided power monitoring techniq... | Experimental investigations of the power absorbed at mechanical resonance | 10.1111/j.1747-1567.2011.00759.x |
2013-09-01 | The active-passive hybrid piezoelectric network (APPN) is investigated to reduce the vibration of cantilever beam. Hamilton’s principle with the Rayleigh-Ritz method is used to derive the equations of motion of the beam with the APPN. Only one piezoelectric actuator is bonded on the cantilever beam, so in the segment o... | Modeling and analysis of cantilever beam with active-passive hybrid piezoelectric network | 10.1007/s11431-013-5320-4 |
2013-09-01 | This paper describes an application study of Magneto-Rheological (MR) grease damper to a structure with three stories. MR fluid is known as one of successful smart materials whose rheological properties can be varied by magnetic field strength, and has been applied to various kinds of device such as dampers, clutches, ... | Vibration control of a structure using Magneto-Rheological grease damper | 10.1007/s11465-013-0268-4 |
2013-09-01 | The possibility of recycling ambient energies with electric generators instead of using batteries with limited life spans has stimulated important research efforts over the past years. The integration of such generators into mainly autonomous low-power systems, for various industrial or domestic applications is envisio... | Energy harvesting based on piezoelectric Ericsson cycles in a piezoceramic material | 10.1140/epjst/e2013-01958-0 |
2013-09-01 | Brittle nature and poor resistance in front of vibrational waves despite of good mechanical strength have limited widespread use of epoxy resins in industry. In current study a new combination of thermoplastic and particulate nanofiller is used as modifier to enhance simultaneously tensile strengths and damping propert... | Preparation, Modeling, and Optimization of Mechanical Properties of Epoxy/HIPS/Silica Hybrid Nanocomposite Using Combination of Central Composite Design and Genetic Algorithm. Part 1. Study of Damping and Tensile Strengths | 10.1007/s11223-013-9499-1 |
2013-09-01 | For the first time, systematic investigations of the damping parameter A of gold nanoparticles as a function of photon energy are presented. A is an essential parameter that quantifies the size-dependent optical properties of metal nanoparticles in the dielectric function. To determine the damping parameter, the depha... | Increased Damping of Plasmon Resonances in Gold Nanoparticles Due to Broadening of the Band Structure | 10.1007/s11468-013-9536-8 |
2013-09-01 | The free vibrations of a thin elastic orthotropic open cylindrical shell (panel) with one edge free and the other three clamped are considered. Dispersion equations to find the natural frequencies of possible types of vibrations are derived using the classical theory of elasticity. An asymptotic relation between the di... | Vibrations of an Orthotropic Cylindrical Panel with Various Boundary Conditions | 10.1007/s10778-013-0588-4 |
2013-09-01 | A floor isolation system installed in a single floor or room in a fixed base structure is designed to protect equipment. With this configuration, the input motions to the floor isolation from the ground motions are filtered by the structure, leaving the majority of the frequency content of the input motion lower than t... |
H
_∞ control in the frequency domain for a semi-active floor isolation system | 10.1007/s11709-013-0214-x |
2013-08-01 | This article deals with self-excited vibrations, attractivity of stationary solutions, and the corresponding bifurcation behavior of two-dimensional differential inclusions of the type $\mathbf{M}\mathbf{q}'' + \mathbf{D}\mathbf{q}' + (\mathbf{K} + \bar{\mu}\mathbf{N})\mathbf{q} \in-\mathbf{R}\operatorname{Sign}(\mathb... | On the effect of non-smooth Coulomb damping on flutter-type self-excitation in a non-gyroscopic circulatory 2-DoF-system | 10.1007/s11071-013-0907-7 |
2013-08-01 | Tree failure may cause significant economic and societal disruptions in urban environments. A better understanding of the relationship between branches and stem as they affect the dynamic response of decurrent trees under wind loading is needed to reduce the risk of tree failure. Finite element (FE) models were used to... | The effect of crown architecture on dynamic amplification factor of an open-grown sugar maple (Acer saccharum L.) | 10.1007/s00468-013-0867-z |
2013-08-01 | An equivalent visco-elastic model of saturated soft clay was studied under unconsolidated undrained (UU) condition, which can be used to evaluate the stability of ocean foundation. Cyclic triaxial compression and extension tests were conducted to study the parameters of the model. Results showed that the relationships ... | Constitutive model of saturated soft clay with cyclic loads under unconsolidated undrained condition | 10.1007/s12209-013-2026-4 |
2013-08-01 | A number of studies have been carried out to investigate the performance of viscoelastic dampers (VEDs) and magnetorheological dampers (MRDs) in controlling the seismic response of buildings, but very few of them regarding the effect of temperature on the behavior of those dampers. The energy absorption properties of t... | Performance of viscoelastic dampers (VED) under various temperatures and application of magnetorheological dampers (MRD) for seismic control of structures | 10.1007/s11043-012-9180-2 |
2013-08-01 | We investigate classical motions of cold atoms in three types (harmonic, linear, and Gaussian) of off-axis rotating traps in the presence of damping forces. When the radius of rotation of the trap is within the trap volume, the atoms are always attracted towards the rotation’s origin if the damping rate Γ is larger tha... | Manipulating cold atoms with off-axis rotating traps | 10.3938/jkps.63.938 |
2013-08-01 | This paper is concerned with estimations of solutions of the Sturm–Liouville equation $$\big(p(x)y'(x)\big)'+\Big(\mu^2 -2i\mu d(x)-q(x)\Big)\rho(x)y(x)=0, \ \ x\in[0,1],$$ ( p ( x ) y ' ( x ) ) ' + ( μ 2 - 2 i μ d ( x ) - q ( x ) ) ρ ( x ) y ( x ) = 0 , x ∈ [ 0 , 1 ] , where $${\mu\in\mathbb{C}}$$ μ ∈ C is a spectral ... | Estimations of Solutions of the Sturm– Liouville Equation with Respect to a Spectral Parameter | 10.1007/s00020-013-2071-3 |
2013-07-16 | In this paper, we investigate the Cauchy problem for the generalized damped Bq equation. By applying fixed point theorem, we prove the global existence and asymptotic decay estimate of solutions for all space dimensions n ≥ 1 provided that the initial value is suitably small. MSC: 35L30, 35L75. | Asymptotic decay estimate of solutions to the generalized damped Bq equation | 10.1186/1029-242X-2013-323 |
2013-07-01 | A robust nonlinear controller is designed for the trajectory tracking of a model-scaled helicopter with uncertain parameters (including uncertain inertial parameters, uncertain structural parameters and uncertain aerodynamic parameters). The proposed controller is based upon the backstepping technique, with modificatio... | Robust nonlinear control for a model-scaled helicopter with parameter uncertainties | 10.1007/s11071-013-0858-z |
2013-07-01 | In the present study, free vibration of a vibratory system equipped with an impact damper, which incorporates the Hertzian contact theory, is investigated. A nonlinear model of an impact damper is constructed using spring, mass, and viscous damper. To increase accuracy of the solution, deformation of the impact damper ... | Free vibration analysis of nonlinear resilient impact dampers | 10.1007/s11071-013-0775-1 |
2013-07-01 | The self-oscillations (surging) of a single-stage centrifugal pump working in a hydraulic system in the cavitation regime before the stall of the water feed were investigated. The character of change in these oscillations with change in the value of the acoustic capacitance positioned at the input of the pump was deter... | Self-Oscillations (Surging) of a Single-Stage Centrifugal Pump in the Cavitation Regime and Their Damping | 10.1007/s10891-013-0911-2 |
2013-07-01 | The problem of the interaction of surface and flexural-gravity waves with a vertical barrier is solved in a two-dimensional formulation. It is assumed that the fluid is ideal and incompressible, has infinite depth, and is partially covered with ice. The ice cover is modeled by an elastic plate of constant thickness. Th... | Interaction of surface and flexural-gravity waves in ice cover with a vertical wall | 10.1134/S0021894413040160 |
2013-07-01 | A two-step iterative scheme based on the multiplicative splitting iteration is presented for PageRank computation. The new algorithm is applied to the linear system formulation of the problem. Our method is essentially a two-parameter iteration which can extend the possibility to optimize the iterative process. Theoret... | On the multi-splitting iteration method for computing PageRank | 10.1007/s12190-013-0645-5 |
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