Relevant bibliographies by topics / Vibration isolation and damping

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Vibration isolation and damping'

Author: Grafiati
Published: 4 June 2021
Last updated: 9 February 2022

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Journal articles on the topic "Vibration isolation and damping"

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Zhanlong, Li, Sun Dagang, Qin Yuan, Zhang Wenjun, and Sun Bao. "Stiffness-Damping Matching Modelling for Vibration Isolation System of Roadheader ECB." International Journal of Acoustics and Vibration 25, no. 1 (March 30, 2020): 54–61. http://dx.doi.org/10.20855/ijav.2020.25.11514.

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The electronic control box (ECB) is a key and precise component of a roadheader. The vibration of the ECB is an increasingly prominent issue as the machine capacity grows. In order to promote the isolation effect of the ECB, a whole-body vibration model considering the cutting effect is derived, based upon which the stiffness-damping matching strategy for the ECB isolator is acquired. For engineering application, the tubular constrained damping isolator (TCDI) is developed based on the constrained damping theory and the matching strategy. The theoretical results show that the isolation effect of the ECB isolator strengthens as the stiffness coefficients decline and the damping coefficients increase. The configurations with larger rear stiffness coefficients and larger front damping coefficients could lead to a better vibration control effect. The experiment results indicate that the TCDI exhibits a greater capability of isolating the impact excitation than the traditional E-type isolator, thus verifying the whole-body vibration model for the roadheader and the matching strategy for the ECB isolator. This research can provide theoretical and practical references for the investigation of the dynamic behaviour of complex viscoelastic structures.
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Lei, Xiaofei, Chengjun Wu, and Hengliang Wu. "A novel composite vibration control method using double-decked floating raft isolation system and particle damper." Journal of Vibration and Control 24, no. 19 (August 28, 2017): 4407–18. http://dx.doi.org/10.1177/1077546317724967.

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This paper presents a composite vibration control method that uses a double-decked floating raft isolation system and particle dampers to control the severe vibration of a heavy compressor set. In view of the structural characteristics of the compressor set, a mechanical impedance method is employed to investigate the acceleration transfer ratios of the double-decked floating raft isolation system, and to design three isolating schemes. Numerical results indicate that the particle damping technology does not disturb the isolating performance of the double-decked floating raft isolation system while reducing only its acceleration amplitude. To improve the damping performance of particle dampers, an anti-resonance method and a co-simulation technique are used to optimize the installation location of the particle dampers, as the damping effect is related to the vibrating velocity at the damper’s position. Furthermore, two types of particle damper—cylindrical and cuboid—are designed, based on conclusions drawn from experiments using the anti-resonance method. The damping effectiveness of the particle damper scheme is also examined using the co-simulation technique; results indicate that the proposed installation scheme can effectively suppress the vibration of the compressor rack. In addition, the presented schemes using the composite vibration control method are verified and compared in on-site experiments, and results demonstrate that the third isolating scheme presented, combined with particle damping technology, is best in controlling vibration of the compressor set.
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Mofidian, S. M. Mahdi, and Hamzeh Bardaweel. "Displacement transmissibility evaluation of vibration isolation system employing nonlinear-damping and nonlinear-stiffness elements." Journal of Vibration and Control 24, no. 18 (July 27, 2017): 4247–59. http://dx.doi.org/10.1177/1077546317722702.

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Undesired oscillations commonly encountered in engineering practice can be harmful to structures and machinery. Vibration isolation systems are used to attenuate undesired oscillations. Recently, there has been growing interest in nonlinear approaches towards vibration isolation systems design. This work is focused on investigating the effect of nonlinear cubic viscous damping in a vibration isolation system consisting of a magnetic spring with a positive nonlinear stiffness, and a mechanical oblique spring with geometric nonlinear negative stiffness. Dynamic model of the vibration isolation system is obtained and the harmonic balance method (HBM) is used to solve the governing dynamic equation. Additionally, fourth order Runge–Kutta numerical simulation is used to obtain displacement transmissibility of the system under investigation. Results obtained from numerical simulation are in good agreement with those obtained using HBM. Results show that introducing nonlinear damping improves the performance of the vibration isolation system. Nonlinear damping purposefully introduced into the described vibration isolation system appears to eliminate undesired frequency jump phenomena traditionally encountered in quasi-zero-stiffness vibration isolation systems. Compared to its rival linear vibration isolation system, the described nonlinear system transmits less vibrations around resonant peak. At lower frequencies, both nonlinear and linear isolation systems show comparable transmissibility characteristics.
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Meng, Qingguo, Xuefeng Yang, Wei Li, En Lu, and Lianchao Sheng. "Research and Analysis of Quasi-Zero-Stiffness Isolator with Geometric Nonlinear Damping." Shock and Vibration 2017 (2017): 1–9. http://dx.doi.org/10.1155/2017/6719054.

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This paper presents a novel quasi-zero-stiffness (QZS) isolator designed by combining a tension spring with a vertical linear spring. In order to improve the performance of low-frequency vibration isolation, geometric nonlinear damping is proposed and applied to a quasi-zero-stiffness (QZS) vibration isolator. Through the study of static characteristics first, the relationship between force displacement and stiffness displacement of the vibration isolation mechanism is established; it is concluded that the parameters of the mechanism have the characteristics of quasi-zero stiffness at the equilibrium position. The solutions of the QZS system are obtained based on the harmonic balance method (HBM). Then, the force transmissibility of the QZS vibration isolator is analyzed. And the results indicate that increasing the nonlinear damping can effectively suppress the transmissibility compared with the nonlinear damping system. Finally, this system is innovative for low-frequency vibration isolation of rehabilitation robots and other applications.
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Smirnov, Vladimir, and Vladimir Mondrus. "Probability Analysis of Precision Equipment Vibration Isolation System." Applied Mechanics and Materials 467 (December 2013): 410–15. http://dx.doi.org/10.4028/www.scientific.net/amm.467.410.

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The article deals with probability analysis for a vibration isolation system of sensitive equipment. Vibration isolation system is subjected to external base vibrations due to ambient oscillations (background noise). Considering Gauss distribution for ambient vibrations, we estimate the probability when the relative displacement of isolated mass will still be lower than the vibration criteria. The problem is solved in three-dimensional space, evolved by the system parameters damping and natural frequency. According to this probability distribution, the chance of exceeding vibration criteria for a vibration isolation system is evaluated and different vibration isolation systems are compared.
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Ren, Yafeng, Shan Chang, Geng Liu, Liyan Wu, and Haiwei Wang. "Vibratory Power Flow Analysis of a Gear-Housing-Foundation Coupled System." Shock and Vibration 2018 (June 28, 2018): 1–13. http://dx.doi.org/10.1155/2018/5974759.

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The marine gearbox is usually installed on a vibration isolation system in order to reduce oscillation transmitted to the ship foundation. However, researches on vibration transmission in the gear-housing system and isolation system are currently independent. With the increasing requirement of lower vibration, a coupled model needs to be built to control the vibration propagation from a view of the whole system. Considering the mesh transmission error excitation of a gear pair, a flexible gear-housing-foundation coupled impedance model is constructed in this paper, and the vibratory power flow of the whole system is calculated. Power transmissions between three different gearbox installation configurations, that is, rigid installation, single-stage isolation, and double-stage isolation, are compared. Taking the single-stage isolation configuration as an example, parameter influences on the vibration of the foundation are studied. Results show that double-stage isolation can achieve lower vibration than single-stage isolation; decrease in bearing stiffness or Young’s modulus of isolator will yield better vibration isolation performance; housing damping and isolator damping are beneficial to vibration reduction.
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Jurevicius, M., V. Vekteris, V. Turla, A. Kilikevicius, and G. Viselga. "Investigation of the dynamic efficiency of complex passive low-frequency vibration isolation systems." Journal of Low Frequency Noise, Vibration and Active Control 38, no. 2 (January 3, 2019): 608–14. http://dx.doi.org/10.1177/1461348418822230.

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In this study, the theoretical and experimental investigations of the dynamics of complex passive low-frequency vibration systems are described. It is shown that a complex system consisting of a vibrating platform, an optical table and a vibration isolation system of quasi-zero stiffness loaded by a certain mass may isolate low-frequency vibrations in a narrow frequency range only. In another case, the system does not isolate vibrations; it even operates as an amplifier. The frequencies that ensure the top efficiency of the vibration damping system of quasi-zero stiffness were established.
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Zheng, Hui Ming, Lu Hua Zhu, and Dong Dong Dong. "Vibration Control of Magnetorheological Nanocomposites Isolator." Applied Mechanics and Materials 552 (June 2014): 216–20. http://dx.doi.org/10.4028/www.scientific.net/amm.552.216.

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A novel tunable stiffness and damping vibration isolator based on magnetorheological nanocomposites filled with carbon nanotubes (CNMRE) was proposed. The stiffness and damping is controlled by the current applied to the magnetic excitation coil. Under the combined ON–OFF control law, the proposed vibration isolator shows satisfying isolation effect. The simulation results indicate that, in comparison to MRE isolator with ON–OFF stiffness and damping control, CNMRE isolator with ON–OFF control not only has high stiffness and damping capacity, corrosion resistance, and high failure strength which are demanded in industries, but also significantly suppresses vibration under sinusoid excitation, random excitation, and pulse excitation. The proposed vibration isolator is very simple and easy to be applied in practical system.
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Li, Xin, Jinqiu Zhang, and Jun Yao. "Effect of the Time-Varying Damping on the Vibration Isolation of a Quasi-Zero-Stiffness Vibration Isolator." Shock and Vibration 2020 (May 8, 2020): 1–10. http://dx.doi.org/10.1155/2020/4373828.

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This study focuses on the effect of damping changes on the vibration isolation of a quasi-zero-stiffness vibration isolator. A nonlinear-vibration equation for the quasi-zero-stiffness vibration isolator is found and solved using the multiscale method. Then, the vibration characteristics before, in the process of and after the damping change, are also examined. The results show that time-varying damping can be equivalent to the addition of a stiffness term to the vibration system, which leads to a change of the vibration amplitude frequency response, leakage of power spectrum, and corresponding linear spectrum features being weakened. When the damping changes rapidly, the vibration system tends to be divergent rather than stable. After the change, the number of stable focuses of the proposed quasi-zero-stiffness vibration isolator increases from one to two, and the system will see decline in its vibration stability.
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Petrakov, E. V. "OPTIMAL TRANSVERSE VIBRATIONS DAMPING OF A CONSOLE BEAM." Problems of strenght and plasticity 81, no. 1 (2019): 94–102. http://dx.doi.org/10.32326/1814-9146-2019-81-1-94-102.

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The multicriteria problem of transverse vibrations damping of a console beam is colved by the active and passive damping methods. The mathematical model of beam is provided by Bernoulli-Euler's hypotheses with the linear viscosity. Perturbation acting on the beam belongs to a class L2 of functions. The beam mode is described by Krylov functions. The normal form method is used to convert to the main coordinates. A model of active vibration isolation applied along the entire length of the console beam and a model connected to a vertical base at one point were constructed. The task of transverse vibrations damping is a state feedback control problem with two controlled outputs. Two criteria are introduced: the level of the control force and the maximum deflection of the beam. The generalized H2-norm is used as a measure of functional evaluation in the synthesis of optimal regulators. The search for optimal feedback is based on the use of linear matrix inequalities and efficient algorithms for solving, implemented in the MATLAB package. Synthesis of Pareto optimal control is implemented on the basis of Germeyer convolution. The optimal values of the functional under distributed and concentrated vibration isolations are given with respect to two criteria for active and passive damping methods. The paper includes a comparison of vibration isolation for different damping methods.
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Dissertations / Theses on the topic "Vibration isolation and damping"

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Machado, Luciano G. "Shape memory alloy for vibration isolation and damping." Texas A&M University, 2007. http://hdl.handle.net/1969.1/85772.

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This work investigates the use of shape memory alloys (SMAs) for vibration isolation and damping of mechanical systems. The first part of this work evaluates the nonlinear dynamics of a passive vibration isolation and damping (PVID) device through numerical simulations and experimental correlations. The device, a mass connected to a frame through two SMA wires, is subjected to a series of continuous acceleration functions in the form of a sine sweep. Frequency responses and transmissibility of the device as well as temperature variations of the SMA wires are analyzed for the case where the SMA wires are pre-strained at 4.0% of their original length. Numerical simulations of a one-degree of freedom (1-DOF) SMA oscillator are also conducted to corroborate the experimental results. The configuration of the SMA oscillator is based on the PVID device. A modified version of the constitutive model proposed by Boyd and Lagoudas, which considers the thermomechanical coupling, is used to predict the behavior of the SMA elements of the oscillator. The second part of this work numerically investigates chaotic responses of a 1- DOF SMA oscillator composed of a mass and a SMA element. The restitution force of the oscillator is provided by an SMA element described by a rate-independent, hysteretic, thermomechanical constitutive model. This model, which is a new version of the model presented in the first part of this work, allows smooth transitions between the austenitic and the martensitic phases. Chaotic responses of the SMA oscillator are evaluated through the estimation of the Lyapunov exponents. The Lyapunov exponent estimation of the SMA system is done by adapting the algorithm by Wolf and co-workers. The main issue of using this algorithm for nonlinear, rateindependent, hysteretic systems is related to the procedure of linearization of the equations of motion. The present work establishes a procedure of linearization that allows the use of the classical algorithm. Two different modeling cases are considered for isothermal and non-isothermal heat transfer conditions. The evaluation of the Lyapunov exponents shows that the proposed procedure is capable of quantifying chaos in rate-independent, hysteretic dynamical systems.
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Panananda, Nuttarut. "The effects of cubic damping on vibration isolation." Thesis, University of Southampton, 2014. https://eprints.soton.ac.uk/365357/.

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Vibration isolators are often assumed to possess linear viscous damping which has well known consequences for their performance. However, damping may be designed to be or prove to be nonlinear. This study investigates the effect of cubic damping, as an example of damping nonlinearity, in a single degree of freedom (SDOF) vibration isolation system. The response behaviour due to two excitation types, namely harmonic and broadband excitations, was examined. For harmonic excitation, the Harmonic Balance Method (HBM) was applied to yield approximate closed form solutions and simplified analytical expressions implicitly show the influence of cubic damping for particular frequency regions. The HBM solutions were verified using direct numerical integration. The presence of cubic damping proves to be beneficial for the force excited case. It reduces response amplitude around the resonance frequency and has similar response to an undamped system in the isolation region. In contrast, for base excitation, the cubic damping is detrimental at high excitation frequencies as the base excitation and isolated mass move almost together. The effect becomes more pronounced for larger excitation amplitudes. The case of base excitation was then considered for broadband excitation. The responses using direct numerical integration were presented using power spectral densities. In contrast to harmonic excitation, the amplitude of the response does not appear to approach that of the input. Instead, a higher effective cubic damping results in a higher vibration level of the isolated mass at frequencies below the resonance frequency. It also does not reduce explicitly the response amplitude around the resonance frequency unlike the linear viscous damping. For a constant displacement amplitude random excitation, the excitation frequency bandwidth is found to be a significant factor in the level of effective cubic damping. A broader excitation bandwidth results in a higher level of cubic damping force. The theoretical and numerical results for both harmonic and broadband excitation were validated experimentally. The experimental investigation was performed using a SDOF base excited vibration isolation system possessing a simple velocity feedback control active damper to reproduce the nonlinear damping force. The predictions were shown to be in good agreement with measurements thereby verifying the effects of cubic damping on a SDOF system undergoing harmonic and broadband base excitation.
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Howard, Carl. "Active isolation of machinery vibration from flexible structures." Title page, abstract and table of contents only, 1999. http://web4.library.adelaide.edu.au/theses/09PH/09phh8478.pdf.

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Thesis (Ph. D.)--University of Adelaide, Dept. of Mechanical Engineering, 1999?
Copy 2 does not have a CD-ROM. Includes bibliographical references (p. 317-330). Also available in an electronic version.
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Liu, Yuyou. "Semi-active damping control for vibration isolation of base disturbances." Thesis, University of Southampton, 2004. https://eprints.soton.ac.uk/66164/.

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This thesis is concerned with semi-active damping control for vibration isolation of base disturbances. The aim is to investigate the effectiveness and suitability of semi-active damping control strategies for improving steady-state vibration isolation. A single-degree-of-freedom (SDOF) system, comprising a semi-active damper with a linear passive spring in parallel, is used to study the vibration isolation of base excitation. The semi-active control strategies investigated include on-off skyhook control, continuous skyhook control, on-off balance control and continuous balance control. Chatter and jerk problems are investigated, which can arise in numerical simulations and possibly in practice when using semi-active control strategies. Anti-chatter and anti-jerk control strategies are proposed. These control strategies are implemented numerically in Matlab/Simulink. Harmonic, periodic and random disturbances are considered in this thesis. The vibration isolation performance is evaluated in terms of Root-Mean-Square (RMS) acceleration transmissibility. The performance of these control strategies for the isolation of harmonic disturbances is firstly studied. The performance is compared with those of an adaptive-passive control strategy, a conventional and a skyhook passive damper. Results show that the semi-active control strategies can provide a better isolation than a conventional passive system with an equivalent damping level. The semi-active damper can provide isolation over the whole frequency range if the on-state damping of the semi-active damper is big enough. The fraction of time when the damper is turned on or off is found to be frequency dependent. The effects of secondary frequency, which is a harmonic or subharmonic of the fundamental frequency on switching time of the semi-active damper for isolation of the primary harmonic are examined. Upper bounds are derived for fraction of time when the switching time for the fundamental frequency may be affected by the presence of a secondary frequency. The performance of the semi-active isolation system for periodic and random disturbances, where there is more than one harmonic in the disturbance spectrum is investigated. The results for square wave and triangular wave disturbances suggest that semi-active control strategies are promising for periodic disturbance. Three special cases are considered for random disturbances when the acceleration, velocity and displacement inputs have flat spectra. The semi-active control strategies can provide some advantage in performance for random velocity and displacement disturbances with medium to high damping ratios. Only continuous skyhook control strategy can provide some benefit in isolation performance for random acceleration disturbances. Following on from the numerical simulations, experimental work is carried out to validate the simulation results. The experimental set-up incorporates an electromagnetic device as a semi-active damper. The on-off skyhook control algorithm is chosen to be implemented using an analogue circuit. The damping of the electromagnetic semi-active damper is achieved by opening and closing the magnet-coil circuit. Numerical predictions are confirmed by experimental observation. The performance of the electromagnetic damper is limited by the achievable damping level.
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De, Marneffe Bruno. "Active and passive vibration isolation and damping via shunted transducers." Doctoral thesis, Universite Libre de Bruxelles, 2007. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210613.

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Many different active control techniques can be used to control the vibrations of a mechanical structure: they however require at least a sensitive signal amplifier (for the sensor), a power amplifier (for the actuator) and an analog or digital filter (for the controller). The use of all these electronic devices may be impractical in many applications and has motivated the use of the so-called shunt circuits, in which an electrical circuit is directly connected to a transducer embedded in the structure. The transducer acts as an energy converter: it transforms mechanical (vibrational) energy into electrical energy, which is in turn dissipated in the shunt circuit. No separate sensor is required, and only one, generally simple electronic circuit is used. The stability of the shunted structure is guaranteed if the electric circuit is passive, i.e. if it is made of passive components such as resistors and inductors.

This thesis compares the performances of the electric shunt circuits with those of classical active control systems. It successively considers the use of piezoelectric transducers and that of electromagnetic (moving-coil) transducers.

In a first part, the different damping techniques are applied on a benchmark truss structure equipped with a piezoelectric stack transducer. A unified formulation is found and experimentally verified for an active control law, the Integral Force Feedback (IFF), and for various passive shunt circuits (resistive and resistive-inductive). The use of an active shunt, namely the negative capacitance, is also investigated in detail. Two different implementations are discussed: they are shown to have very different stability limits and performances.

In a second part, vibration isolation with electromagnetic (moving-coil) transducers is introduced. The effects of an inductive-resistive shunt circuit are studied in detail; an equivalent mechanical representation is found. The performances are compared with that of resonant shunts and with that of active isolation with IFF. Next, the construction of a six-axis isolator based on a Stewart Platform is presented: the key parameters and the main limitations of the system are highlighted.


Doctorat en Sciences de l'ingénieur
info:eu-repo/semantics/nonPublished
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Thayer, Douglas Gary. "Multi-sensor control for 6-axis active vibration isolation /." Thesis, Connect to this title online Connect to this title online; UW restricted, 1998. http://hdl.handle.net/1773/9976.

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Abu, Hanieh Ahmed. "Active isolation and damping of vibrations via stewart platform." Doctoral thesis, Universite Libre de Bruxelles, 2003. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211336.

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In this work, we investigate the active vibration isolation and damping of sensitive equipment. Several single-axis isolation techniques are analyzed and tested. A comparison between the sky-hook damper, integral force feedback, inertial velocity feedback and LagLead control techniques is conducted using several practical examples.

The study of single-axis systems has been developed and used to build a six-axis isolator. A six degrees of freedom active isolator based on Stewart platform has been designed manufactured and tested for the purpose of active vibration isolation of sensitive payloads in space applications. This six-axis hexapod is designed according to the cubic configuration; it consists of two triangular parallel plates connected to each other by six active legs orthogonal to each other; each leg consists of a voice coil actuator, a force sensor and two flexible joints. Two different control techniques have been tested to control this isolator :integral force feedback and Lag-Lead compensator, the two techniques are based on force feedback and are applied in a decentralized manner. A micro-gravity parabolic flight test has been clone to test the isolator in micro-gravity environment.

ln the context of this research, another hexapod has been produced ;a generic active damping and precision painting interface based on Stewart platform. This hexapod consists of two parallel plates connected to each other by six active legs configured according to the cubic architecture. Each leg consists of an amplified piezoelectric actuator, a force sensor and two flexible joints. This Stewart platform is addressed to space applications where it aims at controlling the vibrations of space structures while connecting them rigidly. The control technique used here is the decentralized integral force feedback.


Doctorat en sciences appliquées
info:eu-repo/semantics/nonPublished

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Pei, Yalu. "Multi-resonant Electromagnetic Shunt in Base Isolation for Vibration Damping and Energy Harvesting." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/74975.

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The objective of this thesis is to develop a dual-functional approach to effectively mitigate the earthquake induced vibrations of low- or mid-rise buildings, and at the same time to efficiently harvest utility-scale energy by using an optimally configured multi-resonant electromagnetic shunt in base isolation. In this research, two multi-resonant shunt configurations, parallel and series, were proposed and optimized based on the H2 criteria when the base isolation system is subjected to ground acceleration excitations. The performance of the proposed multi-resonant electromagnetic shunt was compared with traditional multiple tuned mass dampers (TMDs) applied to the base isolation system. It shows that, for multiple TMDs and multi-resonant electromagnetic shunt dampers with 5% total stiffness ratio, the parallel shunt electromagnetic shunt can achieve the best vibration mitigation performance among other types of multi-resonant dampers, including parallel TMDs, series TMDs and the series electromagnetic shunt damper. Case study of a base-isolated structure was analyzed to investigate the effectiveness of the proposed multi-resonant electromagnetic shunt. It shows that both multi-mode shunt circuits outperform single mode shunt circuit by suppressing the primary and the second vibration modes simultaneously. Comparatively, the parallel shunt circuit is more effective in vibration mitigation and energy harvesting, and is also more robust in parameter mistuning than the series shunt circuit. The time history response analysis shows that, under the recorded Northridge earthquake, the instant peak power and total average power capable to be harvested by the multi-resonant shunt can reach up to 1.18 MW and 203.37KW, respectively. This thesis further experimentally validated the effectiveness of the multi-resonant electromagnetic shunt on a scaled-down base-isolated building. The impact hammer test shows that the multi-resonant electromagnetic shunt can achieve enhanced vibration suppression by reducing the first resonant peak by 27.50dB and the second resonant peak by 22.57dB regarding the primary structure acceleration. The shake table test shows that under scaled Kobe and Northridge earthquake signals, the electromagnetic shunt can effectively reduce the vibration resonant peak value by 38.92% and 66.61%, respectively. The voltage simultaneously generated in the multi-mode shunt circuit was also obtained, which demonstrated the dual functions of the multi-resonant electromagnetic shunt in base isolation.
Master of Science
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Liu, Yanqing. "Variable damping and stiffness semi-active vibration isolation control using magnetorheological fluid dampers." 京都大学 (Kyoto University), 2005. http://hdl.handle.net/2433/144553.

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Macháček, Ondřej. "Magnetorheological Strut for Vibration Isolation System of Space Launcher." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-391819.

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Práce se zabývá návrhem magnetoreologické (MR) vzpěry vibroizolačního systému (VIS) pro kosmický nosič. V rešeršní části jsou popsány vybrané VIS a vzpěry těchto systémů, které byly v kosmických nosičích využity v minulosti. Každá z těchto vzpěr obsahující kapalinu byla těsněna pomocí statických těsnění a pružných vlnovců vyrobených z oceli. Důkladněji byla analyzována vzpěra pasivního systému VIS s označením ELVIS, jehož konstrukce se stala inspirací pro tuto práci. Jedná se o tříparametrický systém, v němž je tlumič uložen na pružině, jejíž tuhost přibližně odpovídá objemové tuhosti vlnovců respektive jejímu průmětu do axiálního směru (pressure thrust stiffness). V práci je představena metodika pro stanovení “pressure thrust stiffness” na základě geometrie vlnovce a také uvedeny parametry vlnovce díky kterým je možné měnit poměr mezi axiální a “pressure thrust stiffness” vlnovce. Tento poměr ovlivňuje v dané koncepci vzpěry její dynamické chování a tím i chování celého VIS. Pro predikci dynamického chování vzpěry byl vytvořen multi-body model VIS založeného na Stewartově plošině a detailnější model jediné vzpěry. Simulace provedené v tomto modelu odhalily parametry, které mají vliv na výkonost tlumiče ve VIS: časová odezva a dynamický rozsah. Díky modelu byl určen rozsah těchto parametrů, ve kterých bude zaručena efektivní funkce vzpěry ve VIS, konkrétně: časová odezva: 0-5ms, dynamický rozsah: 5-10. Před finálním návrhem vzpěry byla sestrojena vzpěra experimentální vzpěra, jejíž parametry byly přesně naměřeny a využity pro verifikaci jednotlivých modelů. Poznatky získané během experimentů byly využity při návrhu finální vzpěry. Jeden z nejdůležitějších poznatků byla nutnost náhrady feritového magnetického obvodu s ohledem na jeho křehkost. Proto byl odvozen tvarový přístup k navrhování rychlých magnetických obvodů z oceli s využitím 3D tisku, který byl následně patentován. Navržená vzpěra obsahuje magnetoreologický ventil jehož odezva je predikována na 1.2 ms a dynamický rozsah 10. V závěru práce je představena metodika, díky které byla vzpěra navržena.
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Books on the topic "Vibration isolation and damping"

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Passive vibration isolation. New York: ASME Press, 2003.

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A, Furman F., and Rivin Eugene I, eds. Applied theory of vibration isolation systems. New York: Hemisphere Pub. Corp., 1990.

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Sinha, Alok K. A new approach to active vibration isolation for microgravity space experiments. [Washington, DC]: National Aeronautics and Space Administration, 1990.

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Kelly, James M. Mechanics of rubber bearings for seismic and vibration isolation. Chichester, West Sussex, U.K: Wiley, 2011.

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Berg, Robert F. NIST torsion oscillator viscometer response: Performance on the LeRC active vibration isolation platform. [Washington, DC]: National Aeronautics and Space Administration, 1992.

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Johnson, Terry L. Development of a simulation capability for the space station Active Rack Isolation System. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1998.

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Pearson, Lillian. Design of a vibration isolation system for a cycle ergometer to be used on board the space shuttle. Austin, Tex: Mechanical Engineering Design Projects Program, University of Texas at Austin, 1991.

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Pearson, Lillian. Design of a vibration isolation system for a cycle ergometer to be used on board the space shuttle. Austin, Tex: Mechanical Engineering Design Projects Program, University of Texas at Austin, 1991.

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Powell, J. David. Kinetic isolation tether experiment: Annual report. [Washington, D.C: National Aeronautics and Space Administration, 1988.

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International, Workshop on Vibration Isolation Technology for Microgravity Science Applications (1991 Middleburg Heights Ohio). International Workshop on Vibration Isolation Technology for Microgravity Science Applications: Proceedings of a conference held at the Middleburg Heights Holiday Inn, April 23-25, 1991. [Cleveland, OH]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1992.

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Book chapters on the topic "Vibration isolation and damping"

1

Ungar, Eric E. "Vibration Isolation and Damping." In Encyclopedia of Acoustics, 843–55. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470172520.ch71.

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Platz, Roland. "Approach to Assess Basic Deterministic Data and Model Form Uncertaint in Passive and Active Vibration Isolation." In Lecture Notes in Mechanical Engineering, 208–23. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-77256-7_17.

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AbstractThis contribution continues ongoing own research on uncertainty quantification in structural vibration isolation in early design stage by various deterministic and non-deterministic approaches. It takes into account one simple structural dynamic system example throughout the investigation: a one mass oscillator subject to passive and active vibration isolation. In this context, passive means that the vibration isolation only depends on preset inertia, damping, and stiffness properties. Active means that additional controlled forces enhance vibration isolation. The simple system allows a holistic, consistent and transparent look into mathematical modeling, numerical simulation, experimental test and uncertainty quantification for verification and validation. The oscillator represents fundamental structural dynamic behavior of machines, trusses, suspension legs etc. under variable mechanical loading. This contribution assesses basic experimental data and mathematical model form uncertainty in predicting the passive and enhanced vibration isolation after model calibration as the basis for further deterministic and non-deterministic uncertainty quantification measures. The prediction covers six different damping cases, three for passive and three for active configuration. A least squares minimization (LSM) enables calibrating multiple model parameters using different outcomes in time and in frequency domain from experimental observations. Its adequacy strongly depends on varied damping properties, especially in passive configuration.
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Cops, Mark J., J. Gregory McDaniel, Elizabeth A. Magliula, and David J. Bamford. "Metallic Foam Metamaterials for Vibration Damping and Isolation." In STEAM-H: Science, Technology, Engineering, Agriculture, Mathematics & Health, 123–37. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-64151-1_7.

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Chernyshev, V., and O. Fominova. "Control of Damping Process in System of Vibration Isolation." In Proceedings of the 4th International Conference on Industrial Engineering, 341–49. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-95630-5_37.

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Marinova, Daniela. "Damping Control Strategies for Vibration Isolation of Disturbed Structures." In Lecture Notes in Computer Science, 400–407. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-00464-3_45.

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Chernyshov, K. V., A. V. Pozdeev, and I. M. Ryabov. "Vibration Isolation Properties of Vehicle Suspension at Optimal Instantaneous Damping Control in Oscillation Cycle." In Lecture Notes in Mechanical Engineering, 819–28. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-22041-9_87.

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Lu, Ze-Qi, Dong-Hao Gu, Ye-Wei Zhang, Hu Ding, Walter Lacarbonara, and Li-Qun Chen. "Comparison of Linear and Nonlinear Damping Effects on a Ring Vibration Isolator." In Nonlinear Dynamics and Control, 13–22. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-34747-5_2.

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Bozyigit, Baran, Yusuf Yesilce, and Hikmet Huseyin Catal. "Free Flexural Vibrations of Axially Loaded Timoshenko Beams with Internal Viscous Damping Using Dynamic Stiffness Formulation and Differential Transformation." In Seismic Isolation, Structural Health Monitoring, and Performance Based Seismic Design in Earthquake Engineering, 307–28. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-93157-9_15.

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Karnovsky, Igor A., and Evgeniy Lebed. "Vibration Damping." In Theory of Vibration Protection, 167–205. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-28020-2_5.

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Lalanne, Christian. "Non-Viscous Damping." In Sinusoidal Vibration, 261–89. Chichester, UK: John Wiley & Sons, Ltd, 2014. http://dx.doi.org/10.1002/9781118931110.ch7.

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Conference papers on the topic "Vibration isolation and damping"

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Griffen, Christopher, Jim Ding, and Brian Knox. "Powertrain NVH: Strategic Damping & amp; Isolation Approaches." In SAE Brasil Noise and Vibration Conference. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2008. http://dx.doi.org/10.4271/2008-36-0593.

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Cherng, John G., Tong Ge, and Sheng-Lih Peng. "Vibration Isolation and Damping for Bucking Bars." In ASME 1997 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/detc97/vib-4119.

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Abstract Bucking bars are used with pneumatic percussive rivet tools for airplanes, ships, and heavy vehicle constructions. The rivet is actually flattened by the bucking bar instead of the riveting hammer when the force is transmitted to the contact point between the rivet stem and the bucking bar. It has been proven that the operator who is holding the backing bar receives higher level of vibration than the person who is operating the rivet hammer. However, more attention has been given to the design modifications of the rivet hammer than the bucking bars which may due to the economic reasons. (The price of hammer is 50 to 100 times higher than the bucking bars’ price.) In this paper, the vibration characteristics of the bucking bars, the applications of vibration isolation and damping to the bucking bars, the optimum mass distribution calculated by a two degree-of-freedom model and the comparative results of the conventional bucking bar and ergonomically modified bucking bars are presented.
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Bukkems, B., T. Ruijl, and J. Simons. "Vibration isolation and damping in high precision equipment." In Fourth European Seminar on Precision Optics Manufacturing, edited by Oliver W. Fähnle, Rolf Rascher, and Christine Wünsche. SPIE, 2017. http://dx.doi.org/10.1117/12.2272166.

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Liu, Yanning, Yanchu Xu, and Bill Flynn. "Isolation and Vibration Transmission Reduction of Systems Mounted on a Flexible Structure." In ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/detc2003/vib-48558.

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Issues addressed in this paper are related to the isolation and vibration transmission of vibration-sensitive systems mounted on a flexible support. The normal operation of certain electronic, optical and mechanical systems requires a vibration-free environment. To obtain such an environment, these systems are usually isolated from their supports with soft springs. When an array of such systems is needed, due to space constraints or other reasons, they are typically mounted on a common support, which in practice is flexible. Although such a design generally is effective in isolating vibration from ground support, vibration from one system, due to excitations other than from its support, can easily transmit to nearby systems. The level of the transmitted vibration (also known as vibration interaction) can be very significant, especially when all the systems are designed identically for simplicity and with less damping for effective ground vibration isolation. Isolator frequency separation (decoupling), viscous and viscoelastic damping are studied for the reduction of vibration transmission among the systems and their effects on system isolation are discussed. It is found that although the isolator frequency separation and viscous damping could be used for vibration transmission reduction among the isolated systems on the flexible support, the addition of viscoelastic damping reduces the vibration transmission without sacrificing their isolation performance. The difference between viscous and viscoelastic damping on ground vibration isolation is explained theoretically in the final part of the paper using a one degree of freedom model.
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Tavossi, Hasson M. "Particulate damping media and isolation of ground borne vibration." In 171st Meeting of the Acoustical Society of America. Acoustical Society of America, 2016. http://dx.doi.org/10.1121/2.0000218.

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Blandino, Theresa, and Aldo Ferri. "Shock and Vibration Isolation Using Dynamic Mounts With Internal Damping." In ASME 2018 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/detc2018-86214.

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Shock isolation systems are often modeled as having lumped stiffness and damping characteristics. However, the isolation performance may be improved if the isolation mount is allowed to have internal dynamics. Previous work has considered several different ways of disrupting the disturbance as it propagates along the length of a multi-degree-of-freedom mount. In this paper, the role of internal damping of the mount is re-examined. Furthermore, the damping model is extended to allow different levels of damping in different response regimes. Through simulation of the shock response, the findings show that the optimal level of internal damping depends on the magnitude of the input shock. For small shocks, performance is best for a relatively high level of damping, but for larger shocks, the best damping value drops to a much lower value. The effect on isolation performance of having different damping levels in different response regimes is shown to be fairly modest, and is shown to depend on the input excitation level.
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KINOSHITA, Takahiro, Takayuki SONE, Masanori IIDA, Tsutomu YOKONAMI, and Kenta NAGAHAMA. "PROPOSAL OF DAMPING SYSTEMS FOR CHANDELIERS." In The 16th World Conference on Seismic Isolation, Energy Dissipation and Active Vibration Control of Structures. Russian Association for Earthquake Engineering and Protection from Natural and Manmade Hazards, 2019. http://dx.doi.org/10.37153/2686-7974-2019-16-449-459.

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Camelo, Vanessa, Allen Bronowicki, Reem Hejal, Stepan Simonian, and Sarah Brennan. "Damping and Isolation Concepts for Vibration Suppression and Pointing Performance." In 50th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2009. http://dx.doi.org/10.2514/6.2009-2637.

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Minqing Wang, Qiaojiao Li, Fei Han, Xiao Wang, and Haohao Zhang. "Study on damping control for vibration isolation and its application." In 2017 14th International Bhurban Conference on Applied Sciences and Technology (IBCAST). IEEE, 2017. http://dx.doi.org/10.1109/ibcast.2017.7868121.

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Mahmoudian, Pooya, and Reza Kashani. "Active Stiffness and Damping Control of Air Mounted/Suspended Systems." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-66272.

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Passive mounts/springs with negligible damping and low stiffness are highly effective in isolating vibration but have poor shock isolation characteristics. This and other contradictory traits of passive mounts, make the realization of an ideal, uncompromised isolation system unfeasible. To avoid an isolation system design based on a compromise among its conflicting requirements, a degree of real-time, on-demand adjustability should be built into the mounting system. Air springs/mounts, because of their inherent adjustability, are the best candidate for such adjustable isolation; other passive mounts, e.g. elastomeric, would require the introduction of an additional active element/actuator to work in parallel with the mount. In this proposed adjustable air mounting system, shock isolation can be enhanced without undermining the vibration isolation effectiveness by using an on-demand, active damping scheme which adds various levels of damping to an air mounted/suspension application, e.g., the cab in a truck, depending on the instantaneous urgency of shock isolation over vibration isolation. In addition, the proposed adjustable isolation scheme contains an on-demand, active stiffness control working in parallel with the active damping scheme. Depending on the operating conditions, the stiffness of the mount will be lowered to better its vibration isolation or increased to enhance its shock isolation. The active damping and stiffness control along with other on-demand adjustment tactics for an air isolation system are described, numerically examined, and experimentally demonstrated.
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Reports on the topic "Vibration isolation and damping"

1

Wang, Kon-Well. Simultaneous Vibration Isolation and Damping Control Via High Authority Smart Structures. Fort Belvoir, VA: Defense Technical Information Center, January 2000. http://dx.doi.org/10.21236/ada424492.

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Lagoudas, Dimitris C., Tamas Kalmar-Nagy, and Magdalini Z. Lagoudas. Shape Memory Alloys for Vibration Isolation and Damping of Large-Scale Space Structures. Fort Belvoir, VA: Defense Technical Information Center, August 2010. http://dx.doi.org/10.21236/ada564585.

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Yoshikawa, Shoko, R. Meyer, J. Witham, S. Y. Agadda, and G. Lesieutre. Passive Vibration Damping Materials: Piezoelectric Ceramic Composites for Vibration Damping Applications. Fort Belvoir, VA: Defense Technical Information Center, August 1995. http://dx.doi.org/10.21236/ada298477.

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Yoshikawa, Shoko, and S. K. Kurtz. Passive Vibration Damping Materials: Piezoelectric Ceramics Composites for Vibration Damping Applications. Fort Belvoir, VA: Defense Technical Information Center, February 1993. http://dx.doi.org/10.21236/ada260792.

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Simmons, Jack. Vibration Damping Characteristics of Typical Harpsichord Strings. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.1992.

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Clarke, David R. Coatings for High-Temperature Vibration Damping of Turbines. Fort Belvoir, VA: Defense Technical Information Center, October 2009. http://dx.doi.org/10.21236/ada512001.

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Ratcliffe, Colin P., Roger M. Crane, Dean Capone, and Kevin Koudela. Standardized Procedure for Experimental Vibration Testing of Damping Test Specimens. Fort Belvoir, VA: Defense Technical Information Center, December 1998. http://dx.doi.org/10.21236/ada363069.

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Howe, Michael S. Theoretical and Experimental Investigation of Vibration Damping by Vorticity Production. Fort Belvoir, VA: Defense Technical Information Center, July 1998. http://dx.doi.org/10.21236/ada351025.

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Wilke, Paul S., Conor D. Johnson, Patrick J. Grosserode, and Dino Sciulli. Whole-Spacecraft Vibration Isolation on Small Launch Vehicles. Fort Belvoir, VA: Defense Technical Information Center, January 2000. http://dx.doi.org/10.21236/ada476252.

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Maidanik, G. Vibration Damping by a Nearly Continuous Distribution of Nearly Undamped Oscillators. Fort Belvoir, VA: Defense Technical Information Center, April 1999. http://dx.doi.org/10.21236/ada362958.

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