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Dissertations / Theses on the topic 'Vibration Isolation System'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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1

Krull, Alexander G. (Alexander Gerhard). "Experimental testing of LIGO vibration isolation system." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40439.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2007.<br>Includes bibliographical references (leaf 29).<br>The LIGO (Laser Interferometer Gravitational-wave Observatory) project is designed to detect gravitational waves using precision interferometry. The detection from astrophysical sources has the potential to test Einstein's Theory of General Relativity, and additionally open a new window into the universe and its origin. The Initial LIGO detectors are currently operating at a strain sensitivity of 10-21 Hz, or equivalently 1018 m/ [square root of] Hz,
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2

Beavers, George D. "System identification of an ultra-quiet vibration isolation platform." Thesis, Monterey, California. Naval Postgraduate School, 1997. http://hdl.handle.net/10945/9052.

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Approved for public release; distribution is unlimited<br>This thesis details the system identification and initial system validation of the an Ultra-Quiet Vibration Isolation Platform (UQP). With the move toward lighter and more flexible spacecraft, the effects of vibration are of immense concern. As natural or passive damping becomes less effective in controlling undesired vibrations, active vibration control becomes essential. The UQP uses a special configuration of the six degree of freedom Stewart Platform with piezoceramic strut actuators and geophone sensors. This combination gives an e
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Miu, Kevin Kar-Leung. "A low cost, DC-coupled active vibration isolation system." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/46061.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2008.<br>Includes bibliographical references (p. 303-306).<br>In this thesis, I designed and implemented an isolation system that interfaces with traditional air mounts for improved force disturbance rejection relative to passive optical tables.Force disturbance rejection and position alignment are two major functional requirements of vibration isolation systems. With conventional passive isolation systems, a tradeoff exists between improving force disturbance rejection maintaining ground vibration isolation
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4

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
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5

Cinarel, Dilara. "Vibration Isolation Of Inertial Measurement Unit." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614069/index.pdf.

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Sensitive devices are affected by extreme vibration excitations during operation so require isolation from high levels of vibration excitations. When these excitation characteristics of the devices are well known, the vibration isolation can be achieved accurately. However, it is possible to have expected profile information of the excitations with respect to frequency. Therefore, it is practical and useful to implement this information in the design process for vibration isolation. In this thesis, passive vibration isolation technique is examined and a computer code is developed which would
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6

Berba, Michail. "Research of passive low-frequency vibration isolation systems." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2013. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2013~D_20130524_145420-89585.

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In dissertation discuss about new created dynamic characteristics establishment of low-frequency (0,7–50 Hz) vibrations isolation system. Presented theoretical and experimental investigations. Main goal of dissertation – is creation of dynamic parameters establishment methods for low-frequency vibration isolation systems and stiff quasi-zero vibrations isolation system, also investigate their dynamical characteristics and usage possibilities. Investigation object – low-frequency vibrations isolation mechanical systems and their dynamic characteristics establishment. Wish to realize investigati
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7

Zuo, Lei 1974. "Element and system design for active and passive vibration isolation." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/30341.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, February 2005.<br>Includes bibliographical references (p. 277-294).<br>This thesis focusses on broadband vibration isolation, with an emphasis on control of absolute payload motion for ultra-precision instruments such as the MIT/Caltech Laser-Interferometric Gravitational Wave Observatory (LIGO), which is designed to measure spatial strains on the order of 10-²¹. We develop novel passive elements and control strategies as well as a framework for concurrent design of the passive and active elements of singl
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8

Le, Toan T. "A Single-Stage Passive Vibration Isolation System for Scanning Tunneling Microscopy." DigitalCommons@CalPoly, 2021. https://digitalcommons.calpoly.edu/theses/2272.

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Scanning Tunneling Microscopy (STM) uses quantum tunneling effect to study the surfaces of materials on an atomic scale. Since the probe of the microscope is on the order of nanometers away from the surface, the device is prone to noises due to vibrations from the surroundings. To minimize the random noises and floor vibrations, passive vibration isolation is a commonly used technique due to its low cost and simpler design compared to active vibration isolation, especially when the entire vibration isolation system (VIS) stays inside an Ultra High Vacuum (UHV) environment. This research aims t
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9

Knijnenburg, Gerard Franciscus. "Development of a vibration isolation system for a rotary wing unmanned aerial vehicle." Diss., University of Pretoria, 2017. http://hdl.handle.net/2263/62777.

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Antiresonance vibration isolation has long been a well known, studied and applied method for alleviating vibrations in stiff structures where small static deflection and a low transmissibility is needed, making it ideal for use in the rotor-craft industry. Most prior arts focus on passive single frequency antiresonance vibration isolation, while some, most notably liquid inertia vibration isolators, are adapted to actively isolate vibrations at more than one frequency. Very little literature is found on the adaptation of mechanical pendulum antiresonance vibration isolators for in-flight tunab
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10

Giaime, Joseph Anthony. "Studies of laser interferometer design and a vibration isolation system for interferometric gravitational wave detectors." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/11383.

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11

Vujic, Nikola. "Power Regeneration in Actively Controlled Structures." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/33425.

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The power requirements imposed on an active vibration isolation system are quite important to the overall system design. In order to improve the efficiency of an active isolation system we analyze different feedback control strategies which will provide electrical energy regeneration. The active isolation system is modeled in a state-space form for two different types of actuators: a piezoelectric stack actuator and a linear electromagnetic (EM) actuator. During regenerative operation, the power is flowing from the mechanical disturbance through the electromechanical actuator and its switching
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12

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.<p><p>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 pa
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13

Lostroscio, Kaitlin. "Developing Motion Platform Dynamics for Studying Biomechanical Responses During Exercise for Human Spaceflight Applications." Scholar Commons, 2018. http://scholarcommons.usf.edu/etd/7191.

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In future human spaceflight missions, with prolonged exposure to microgravity, resistive and aerobic exercises will be countermeasures for bone loss, muscle loss, and decreased aerobic capacity. Two of the exercises of interest are squats and rowing. The cyclic forces produced during these exercises are at relatively low frequencies which are likely to excite structural resonances of space vehicles. Vibration Isolation Systems (VIS) are being designed to be paired with future exploration exercise devices in order to prevent these cyclic exercise forces from impacting the space vehicle. The VIS
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14

Allen, Matthew Scott. "Global and Multi-Input-Multi-Output (MIMO) Extensions of the Algorithm of Mode Isolation (AMI)." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6877.

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A wide range of dynamic systems can be approximated as linear and time invariant, for which a wealth of tools are available to characterize or modify their dynamic characteristics. Experimental modal analysis (EMA) is a procedure whereby the natural frequencies, damping ratios and mode shapes which parameterize vibratory, linear, time invariant systems are derived from experimentally measured response data. EMA is commonly applied in a multitude of applications, for example, to generate experimental models of dynamic systems, validate finite element models and to characterize dissipation in
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15

Srinivasan, Vijay. "Mobility Analysis of Structure-borne Noise Paths in a Simplified Rotorcraft Gearbox System." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1276884944.

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16

MATUTTI, ALBERTO CORONADO. "ENERGY FLOW IN VIBRATION ISOLATION SYSTEMS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1999. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=1951@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>Sistemas de isolamento de vibrações são utilizados em uma grande variedade de aplicações (automóveis, edifícios, estruturas espaciais como aeronaves, satélites e em máquinas rotativas) para reduzir a transmissão de vibrações mecânicas geradas por equipamentos ou a eles transmitidas pela vizinhança. Um isolamento é obtido inserindo-se um componente mecânico (isolador) que desempenha o papel de vínculo entre o sub-sistema que contém a perturbação e o sub-sistema a ser isolado. Duas são as quantidades geralmente utilizadas p
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17

SOARES, EDSON JOSE. "ENERGY SPREAD IN VIBRATION ISOLATION SYSTEMS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1999. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=26507@1.

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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>Muitas indústrias usam em seus processos materiais viscoplásticos. Esses materiais possuem propriedades que dependem fortemente da temperatura. Não é incomum encontrar processos envolvendo escoamentos não isotérmicos de materiais viscoplásticos. Nesses casos, informações sobre a transferência de calor são extremamente necessárias para um bom atendimento e aperfeiçoamento das operações. Fluidos de perfuração são tipicamente suspensões aquosas, e, por consequência, de natureza viscoplástica.Tais fluidos devem possuir densidade corr
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18

Ananthaganeshan, Kanapathipillai Arunachalam. "Stability and performance of active vibration isolation systems." Thesis, University of Southampton, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273915.

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19

Olsson, Claes. "Active Vibration Control of Multibody Systems : Application to Automotive Design." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-5818.

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20

Yun, Yuan. "Kinematics, dynamics and control analysis for micro positioning and active vibration isolation using parallel manipulators." Thesis, University of Macau, 2011. http://umaclib3.umac.mo/record=b2542954.

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21

Florence, Dennis E. "Time and frequency domain synthesis in the optimal design of shock and vibration isolation for large structural systems." Monterey, California. Naval Postgraduate School, 1997. http://hdl.handle.net/10945/9078.

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Approved for public release; distribution is unlimited<br>The dynamic analysis of large, complex structural systems is computationally intensive and therefore prohibits the use of optimization procedures, which are both iterative and complex with respect to variable search patterns. The solution to this problem is through the use of time and frequency synthesis techniques. They provide a means of rapidly recalculating a system's changed response due to structural modifications, as dictated by the optimization procedure. The efficiency is gained through the fact that the synthesis methods are i
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22

Wang, Wei-chun, and 王煒群. "Developements of Magnetic Assist Vibration Isolation System." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/18620098321481014120.

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碩士<br>國立中正大學<br>機械工程所<br>98<br>Design and Analysis of a vibration isolation system using negative stiffness with Electromagnetic force. The system focuses on developing a passive vibration isolation systems which can&apos;&apos;t reduce the vibration when the system frequency is less than or equal to times the natural frequency. Using an external auxiliary of negative stiffness structure can reduce the stiffness of the system, related to the natural frequency can be reduced and increase the range of vibration isolation. The thesis adapts the electromagnetic force as a source of negative stif
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23

Cheng, Wen-Chung, and 鄭文忠. "Genetic Optimal Design of Passive Vibration Isolation System." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/66324833875543400436.

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碩士<br>大葉大學<br>機電自動化研究所碩士班<br>96<br>Vibration is often resulted from the internal unbalance of rotating components of machine or from the external exciting force. Resonance takes place if the exciting frequency coincided with the natural frequency of system. As system is resonating for a long duration, machine component will be failed in fatigue, shorten in service life, and lost in manufacturing precision or measuring accuracy. Having good accuracy and quality of product, it is necessary to reduce or eliminate the vibration by isolation techniques which is the subject of this research.
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24

Wang, Ruiping. "A study of vibration isolation of engine mount system." Thesis, 2004. http://spectrum.library.concordia.ca/8627/1/MR04434.pdf.

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The engine excitation forces, arising from gas pressure and unbalance force, are widely considered among the main vibration sources for the road vehicles. Even though the current engine mount designs are acceptable for vibration isolation of the transmitted forces from engine to chassis, the performance improvement of the engine mounting system is still required for the tendency of light weight and higher power of the vehicle. In this thesis, a coupled three degree-of-freedom engine mount system with both elastomeric and hydraulic mounts, are developed. The system performance is evaluated thro
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Yeh, Chun-Hsin, and 葉俊欣. "Robust QFT Control of a Novel Vibration Isolation System." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/99531754762344797774.

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碩士<br>國立中正大學<br>機械工程所<br>93<br>In this thesis, we investigate dynamic model and robust control of a novel vibration isolation system. First, we model the equations of motion for the vibration isolation system, and perform experiments to identify system parameters of the equation of motion. The hysteresis and variable loading weight effects are considered as system uncertainties, and are represented by the purposed approximate model. Then we can design a QFT controller with consideration of the approximate model to ensure that vibration isolation can achieve high disturbance rejection performan
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Chun-Hsin, Yen, and 葉俊欣. "Robust QFT Control of a Novel Vibration Isolation System." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/43179038262461107157.

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碩士<br>國立中正大學<br>機械系<br>93<br>In this thesis, we investigate dynamic model and robust control of a novel vibration isolation system. First, we model the equations of motion for the vibration isolation system, and perform experiments to identify system parameters of the equation of motion. The hysteresis and variable loading weight effects are considered as system uncertainties, and are represented by the purposed approximate model. Then we can design a QFT controller with consideration of the approximate model to ensure that vibration isolation can achieve high disturbance rejection performance
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Chen, Yam-Ming, and 陳彥名. "Soft Computing Methods for Active Structure Vibration Isolation System." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/66215295686322854989.

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碩士<br>國立海洋大學<br>系統工程暨造船學系<br>89<br>In this thesis, two kinds of soft computing techniques have been applied to the active structure vibration isolation system. Firstly, the artificial neural networks with back-propagation algorithms, quick-prop algorithms and radial basis function are studied. And then applied them to solve functions approximation. The second part of this thesis, the activate structure vibration isolation system is discussed. In this part, the fuzzy control theory is used to establish a controller for the isolation system. Then use the artificial neural
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Tsai, Tsung-yu, and 蔡宗祐. "Development and Implementation for Vibration Isolation System using DSP-Based Control System." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/97857293068861286706.

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碩士<br>國立中正大學<br>機械工程所<br>96<br>In this thesis, a digital signal processor based (DSP-based) control card was developed and the closed-loop control for vibration isolation system was implemented on this system. The DSP-based control card was designed under given specifications. Then the quantitative feedback theory (QFT) was applied to design the controller for vibration isolation system. To integrate the personal computer (PC) and DSP systems, the RS-232 interface was utilized to transmit the control parameters between PC and DSP system. Finally, in order to improve efficient data transmission
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Hsieh, Min-I., and 謝旻益. "Optimum Design of Engine Vibration Isolation System by Genetic Algorithms." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/62150919157493929841.

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碩士<br>國立臺灣科技大學<br>機械工程系<br>92<br>The main object of this thesis is to design an engine passive suspension system. In the study the genetic algorithms (GAs) is applied to design the optimal suspension springs of engine mounts and their locations to minimize the transmitted force to the floor. The engine system is simulated as a six-degrees of freedom system which is treated as a solid block supported by a number of springs which are excited by the unbalance forces to make engine vibration. The shaking force and the shaking moment of single cylinder exerted on engine body are derived in terms o
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Su, Fu-Cheng, and 蘇富誠. "Multi-Channel Active Vibration Control in Engine Mount Isolation System." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/25203002044403383176.

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碩士<br>大葉大學<br>車輛工程研究所<br>90<br>This thesis describes an active vibration control (AVC) system for single-degree-of-freedom (SDOF) and multiple-degrees-of-freedom (MDOF) isolation platforms. Three various active vibration control techniques are compared and implemented in terms of control structures and control algorithms by using a finite-impulse-response (FIR) in experimental works. The adaptive feedforward and feedback control structure using filtered-x least-mean-square (FXLMS) with synthetic reference is employed, the linear quadratic Gaussian (LQG) algorithm with compensator and the H-i
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31

Chen, Chung-Wang, and 陳昌萬. "Develop Active-passive Vibration Isolation System And Robust Controller Design." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/30649533729917303374.

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碩士<br>國立中正大學<br>機械工程所<br>98<br>n this thesis , we develop a novel active-passive vibration isolation system and design robust controller. In the first place, we discuss and analyze currently available vibration isolation system in the laboratory and improve structure to reduce the resonance amplification at low-frequency in horizontal. The novel active-passive vibration isolation system clould restrain 8 dB disturbance via adding the pendulum system. The active vibration isolation part use piezoelectric materials as a actuator and apply quantitative feedback theory to design robust controlle
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WANG, YAU-SHIAN, and 王耀仙. "Development and Control of an Active-passive Vibration Isolation System." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/71606566708136374362.

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碩士<br>國立中正大學<br>機械系<br>89<br>With the progress of science and technology recently, it also requests dramatically in the high precision machinery, manufacturing or the precision of semiconductor manufacture. However, in spite of dealing the problems of positioning, cutting or high rotational speed, it can’t get rid of the effects of vibration disturbance in limitation of the high pursued precision of work. To attenuate the effects of vibration disturbance, a passive isolation system, which has been widely used in industry. Nevertheless, it will be limited by using the way of passive isolation s
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陳健福. "Vibration Isolation Design of Automotive Seating System with Elastic Vehicle Body." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/10613854926714935037.

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碩士<br>國立臺灣科技大學<br>機械工程系<br>92<br>This thesis presents a vibration isolation optimum design of automotive seating system based upon a half-car model. The vehicle body is simulated as an elastic beam equipped with an active suspension system which possesses a fuzzy controller using the vertical accelerations of front and rear seats, and their rates of change as feedbacks. The mean square values of the vertical accelerations of front and rear seats are chosen to be the fitness function, and the constrained conditions of suspension travels and tire deflections are added as a penalty function. In t
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Hsu, Wei-Lin, and 許維麟. "Application of Model Reference Adaptive Control In Active Vibration Isolation System." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/61932142696836223428.

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碩士<br>國立臺灣大學<br>機械工程學研究所<br>95<br>In semiconductor industry the feature size in integrated circuit devices shrink continuously and the sizes are going from micrometer to nanometer. Vibration influences the precision in micro-electro-mechanical systems greatly. With the advance of technology, the requirement of vibration isolation in inspection equipment and manufacture process equipment is more and more important. In order to solve vibration problem, anti-vibration system is widely used in industry. Passive vibration isolation is popular in industry because of its high stability and low cost,
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Chiang, Feng-Ching, and 江峰慶. "Robust QFT Control of Multi-DOF Active-passive Vibration Isolation System." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/79811998431542415728.

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碩士<br>國立中正大學<br>機械系<br>92<br>This thesis investigates the robust control of multi-DOF active-passive vibration isolation device. PZT materials are utilized to be the actuator of the active vibration isolation system. Due to the hysteresis of PZT materials, we consider the dynamic relation in this plane. We propose the quantification of nonlinear uncertainties. For QFT, we design a multi-DOF robust controller to reduce vibration of low frequency effectively via a closed-loop control. After complete designing and experiment, we find problems of DC value and DSP operation in analog sig
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Tsai, Kun-Jung, and 蔡坤榮. "Design and Analysis of a Vibration Isolation System Using Negative Stiffness." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/87029969543782425154.

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碩士<br>國立中正大學<br>機械工程所<br>97<br>The thesis focuses on developing a passive vibration isolation systems using negative stiffness. The content can be divided into three parts. The first is an investigation of using auxiliary non-linear spring installed orthogonal to the direction of vibration in order to produce a negative stiffness effect. The objective is to reduce the stiffness in the direction of vibration in a large displacement range. Results show that the soften spring is better than the harden spring in producing the negative stiffness. The second part is to determine the geometry of the
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37

Sung, Chung-Rung, and 宋傳榮. "On the Design Method of Mounting System for Automotive Powertrain Vibration Isolation." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/70836080773684272419.

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碩士<br>國立臺灣大學<br>機械工程學研究所<br>101<br>The purpose of this study is to design a good vibration isolated mounting system, using decoupled method and minimizing the acceleration of vibration to achieve better performance. This paper starts with constructing six-degree mounting system model by Lagrange’s equations and with dynamic model of excitations, especially focused on the vibration caused by the whole powertrain. Then, analyze the mounting system’s vibration characteristics at different working area to find the main excitation at each condition. The results show that the importance of consideri
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Fu, Chung-Gin, and 傅從鈞. "Structuralized modelling of power flow analysis of complex nonlinear vibration isolation system." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/94327409253182490981.

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徐禮智. "The application of quantitative feedback theory on an active-passive vibration isolation system." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/47377787521796154992.

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Chunghsien, Wu, and 吳忠憲. "Active-passive Vibration Isolation System Robust Controller Design and Development of Piezoelectric Actuator." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/90407581607464604755.

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Chen, Chi-Jen, and 陳啟仁. "Development and Application of Vibration Isolation System with Adaptive Stiffness Considering Potential Energy." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/74397510063626599770.

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碩士<br>國立交通大學<br>土木工程系所<br>103<br>In recent years, a study of semi-active isolation system named Leverage-type Stiffness Controllable Isolation System (LSCIS) was proposed. The main concept of the LSCIS is to adjust the stiffness in the isolator for the fundamental period of the superstructure by a simple leverage mechanism. Although great performance has been achieved with the support of an algorithm considering the least input energy in far-field earthquakes, some result still reveal that the proposed system is not suitable in application for near-fault strong ground motion. To overcome this
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42

Jiang, An-Qing, and 蔣安青. "Active control of resonant vibration suppression at natural frequency for passive isolation system." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/93608229569568920697.

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碩士<br>南台科技大學<br>機械工程系<br>94<br>This thesis is a research of active vibration control system incorporated with passive isolation system. Vibration acceleration acquired from an accelerator is fed into the controller as an input signal, and a voice coil actuator arranged parallel with spring produces control force. The first step of this research is to develop theoretical equations which govern the system vibration, and discuss the effect on the active vibration control system due to different proportional coefficients. Then, a proportional controller installed in PC is applied to suppress the n
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Liu, Zheng-Jia, and 劉政嘉. "Development and Application of Vibration Isolation System with Adaptive Stiffness Considering Strong Ground Motions." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/70409096753020671212.

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碩士<br>國立交通大學<br>土木工程系所<br>104<br>In recent years, the research of isolation and mitigation system has been getting more and more important. In the past isolation and mitigation system, the effect would be reduced because of unknown earthquake types. To have the best effect of response reduction, the systems have to be automatically changed with the earthquake type. To achieve that, an upgraded algorithm, Feed-forward Predictive Earthquake Energy Analysis (FPEEA), is proposed by considering the energy of earthquake velocity and combined with MEW method to have the optimal response. The new algo
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Yi-Chuan, Lin, and 林義章. "QFT control of an Active-passive Vibration Isolation System using a hysteresis approximate model." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/44310292001659974859.

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碩士<br>國立中正大學<br>機械系<br>91<br>Due to their high stiffness, high resolution and high frequency response, piezoelectric actuators have been widely applied in the high precision positioning, measuring systems. Although piezoelectric materials have the above advantages, the nonlinear hysteresis exits in piezoelectric materials might affect the system performance significantly. Without a deep understanding of their physical properties, the controller design based on linear constitutive equations of the materials might cause the system become unstable. Therefore, one of the objectives of this disser
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Chen, You-Jhong, and 陳有忠. "Control and Synchronization of Active Vibration Isolation System Using Nonlinear Control and its Circuit Implementation." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/41185211903716542556.

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碩士<br>國立臺灣科技大學<br>自動化及控制研究所<br>102<br>The chaotic system is presented in this study by adding two nonlinear springs to the active vibration isolation system which is discovered by Li et al in 2012. We use an innovative technique to present the 3-dimensional phase portraits and its projection simultaneously in order to have a better understanding of the active vibration isolation system. We also discuss the dynamical behaviors of the active vibration isolation system by applying various techniques. These techniques include phase portraits, Poincare maps, divergence computing, power spectrum ana
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Liu, I.-Hwan, and 劉一寰. "Application of Fuzzy Control Theory to Active Vibration Isolation System with Two Degrees of Freedom." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/61355447220167272781.

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碩士<br>國立海洋大學<br>造船工程學系<br>86<br>In this paper, first, the steady-state response to the active vibration isolation system with two degrees of freedom consisting of a main structure and an isolator are derived and analyzed in the frequency domain. Secondly, a fuzzy controller based on the fuzzy control theory for the active vibration isolation system with two degrees offreedom is designed in the time domain. The control forces are determined by using fuzzy control rule based on the displaceme
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Chang, Chin-Hao, and 張智豪. "Analysis of Hybrid Control Design and Its Application on an Active-passive Hybrid Vibration Isolation System." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/63511274716481628833.

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碩士<br>國立中正大學<br>機械系<br>88<br>In this thesis we propose a hybrid control architecture which integrate FX-LMS(Filtered-x Least Mean Square) adaptive feedforward control with FSCF-LQG (Frequency Shaping Cost Functionals Linear Quadratic Gaussian) feedback control into one design .This design is successfully applied to an active-passive vibration isolation system. Since one of the disadvantages of the adaptive feedforward controllers is their poor transient response due to their long learning process. This shortcoming can be effectively corrected with our proposed hybrid control, the transient and
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Mukherjee, Indrajit. "Localization Induced Base Isolation In Fractionally And Hysteretically Damped Nonlinear Systems." Thesis, 2007. http://hdl.handle.net/2005/580.

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This Thesis comprises of two parts containing similar studies of Nonlinear Localization induced Base Isolation of structural systems. The present method of base isolation,like other nonlinear vibration isolation methods, enjoys certain merits like capability of absorbing broad band vibrations, attenuating heavy shocks etc. The research in this thesis is an extension of this base isolation strategy first proposed by Vakakis and co-author. The strategy involves augmenting an appendage referred to as the secondary system with the main structural unit or the primary system, which we want to isolat
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Chang, I.-Cheng, and 張溢成. "Optimization Design of Active Vibration Isolation Systems." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/52338758012629593057.

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碩士<br>國立臺灣海洋大學<br>系統工程暨造船學系<br>96<br>Abstract Firstly, in this thesis, a novel successive Taguchi method for global optimization in design of experiments is proposed. The results show that the performance of this method is outstanding through several discrete optimization problems. Next, the evolution algorithm that is based on the Garbage Can decision-making model of social science in public policies and adapt the search mechanism of the differential evolution algorithm (DE) , called GCMEA, is proposed for the global optimization problems. The search performance of GCMEA is better than DE by
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Fulcher, Benjamin Arledge. "Evaluation of systems containing negative stiffness elements for vibration and shock isolation." Thesis, 2012. http://hdl.handle.net/2152/ETD-UT-2012-05-5648.

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The research presented in this thesis focuses on the modeling, design, and experimentation of systems containing negative stiffness mechanisms for both vibration and shock isolation. The negative stiffness element studied in this research is an axially compressed beam. If a beam is axially compressed past a critical value, it becomes bistable with a region of negative stiffness in the transverse direction. By constraining a buckled beam in its metastable position through attaching a stiff linear spring in mechanical parallel, the resulting system can reach a low level of dynamic stiffness and
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