Relevant bibliographies by topics / Vibration isolation

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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'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 June 2025

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Journal articles on the topic "Vibration isolation"

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He, Xian, Huancai Ou, and Xuewen He. "Optimization of Vibration Isolation Parameters of Electromagnetic Vibration Feeder and Design of Vibration Isolator." Journal of Physics: Conference Series 2383, no. 1 (2022): 012021. http://dx.doi.org/10.1088/1742-6596/2383/1/012021.

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In order to solve the problems of large vibration and noise caused by the unreasonable design of the rubber vibration isolator of the electromagnetic vibrating feeder. Firstly, the relationship between vibration isolation performance and vibration isolation system parameters is theoretically analyzed. Secondly, a multi-objective optimization function is established with the vibration isolation coefficient and amplitude ratio as the optimization objectives. The genetic algorithm is used to optimize the objective function, and the structure and parameters of the rubber vibration isolator are designed according to the optimization results. Finally, using computer simulation, the vibration isolation performance before and after optimization is analyzed and the strength of the vibration isolator is verified. The results show that after optimization, the amplitude of the base of the electromagnetic vibrating feeder decreases by 28.6%, and the amplitude ratio decreases by 53.2%, which achieves a good optimization effect, and the strength of the rubber vibration isolator meets the requirements;
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Li, Shan, Liang Xu, and Yu Qi Wang. "The Research of COMAS Vibrating Conveyor Noise Reduction." Applied Mechanics and Materials 184-185 (June 2012): 583–86. http://dx.doi.org/10.4028/www.scientific.net/amm.184-185.583.

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In a cigarette silk production line of a cigarette factory, the noise of vibrating conveyor not only endangers the health of workers’ listening, but also reduces work efficiency. In this paper, the modal of the frame was analyzed with the ANSYS software. The analysis results show that the frame has torsion vibration and swing. These vibrations will bring adverse effects and noise. Through designing a vibration isolation system on the vibrating conveyor, the reasonableness and effectiveness of the isolation component were proved with static and dynamic analysis of the vibration isolation system with finite element method. At the same time, some rules what select the spring parameters were summed up. Through analyzing the isolation effect of the vibration isolation system in different parameters, these regularity conclusions will provide a basis for the noise reduction [1].
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Tanaka, N., and Y. Kikushima. "A Study of Active Vibration Isolation." Journal of Vibration and Acoustics 107, no. 4 (1985): 392–97. http://dx.doi.org/10.1115/1.3269278.

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For the purpose of suppressing ground vibration produced by vibrating machines, such as forging hammers, press machines, etc., this paper presents an active vibration isolation method. Unlike conventional isolators, the active isolator proposed in this paper permits rigid support of the machines. First, the principle of the active isolation method is shown, and the system equations are derived. Secondly, the characteristics and the design parameters of the active isolation system are presented. Thirdly, from the point of view of the feedforward control method, the dynamic compensators are designed so as to sufficiently suppress the exciting force. Finally, an experiment is carried out to demonstrate that the active isolator is applicable for suppressing the ground vibration.
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Tanaka, N., and Y. Kikushima. "On the Hybrid Vibration Isolation Method." Journal of Vibration and Acoustics 111, no. 1 (1989): 61–70. http://dx.doi.org/10.1115/1.3269824.

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For the purpose of isolating the vibration transmission from machines to soil and vice versa, this paper presents a new active vibration isolation method, that is, a hybrid vibration isolation method capable of isolating the vibration in the whole frequency range. The hybrid isolation method contains the following three characteristics: (1) a low-pass filter of a conventional elastic support method; (2) a high-pass filter of an active vibration isolation method; (3) suppression of a resonant peak due to an elastic support by a servo damper method; First, this paper presents the principle of the hybrid vibration isolation method and shows a fundamental structure of the system. Then by making the active isolator work as a damper, the suppression of a resonant peak due to an elastic support is achieved. Next, taking into consideration both the control effect and the stability of the system, the design procedure of the hybrid vibration isolation system is shown. Moreover, a control chart to estimate the control effect for suppressing the force transmissibility is presented. Finally, an experiment is carried out, demonstrating that the hybrid isolation method is capable of suppressing the exciting force in almost all the frequency range.
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Zhang, Yang, Weiwei Fu, and Lijun Wang. "Modeling analysis of a novel hybrid 6-DOF vibration isolation platform for sensitive instruments." Journal of Physics: Conference Series 2383, no. 1 (2022): 012146. http://dx.doi.org/10.1088/1742-6596/2383/1/012146.

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The inevitable vibration caused by normal operation of the spacecraft in orbit will interfere sensitive instruments, such as space telescope, reconnaissance camera, space interferometer. Serious vibrations affect the accuracy and reliability of the sensitive instruments, even cause flight mission failed. This paper presents a hybrid 6-DOF vibration isolation platform (HVIP) with six degree-of-freedom for active vibration isolation of the space sensitive instruments. The HVIP is composed of three orthogonal vibration isolation module, which composed of the active piezoelectric actuator and passive rubber isolator. The dynamic model of the HVIP is established based Lagrange equation approach. Finally, the numerical simulations are performed to verify the vibration isolation effect of the HVIP.
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Yan, Bo, Ning Yu, and Chuanyu Wu. "A state-of-the-art review on low-frequency nonlinear vibration isolation with electromagnetic mechanisms." Applied Mathematics and Mechanics 43, no. 7 (2022): 1045–62. http://dx.doi.org/10.1007/s10483-022-2868-5.

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AbstractVibration isolation is one of the most efficient approaches to protecting host structures from harmful vibrations, especially in aerospace, mechanical, and architectural engineering, etc. Traditional linear vibration isolation is hard to meet the requirements of the loading capacity and isolation band simultaneously, which limits further engineering application, especially in the low-frequency range. In recent twenty years, the nonlinear vibration isolation technology has been widely investigated to broaden the vibration isolation band by exploiting beneficial nonlinearities. One of the most widely studied objects is the “three-spring” configured quasi-zero-stiffness (QZS) vibration isolator, which can realize the negative stiffness and high-static-low-dynamic stiffness (HSLDS) characteristics. The nonlinear vibration isolation with QZS can overcome the drawbacks of the linear one to achieve a better broadband vibration isolation performance. Due to the characteristics of fast response, strong stroke, nonlinearities, easy control, and low-cost, the nonlinear vibration with electromagnetic mechanisms has attracted attention. In this review, we focus on the basic theory, design methodology, nonlinear damping mechanism, and active control of electromagnetic QZS vibration isolators. Furthermore, we provide perspectives for further studies with electromagnetic devices to realize high-efficiency vibration isolation.
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Gao, M., S. P. Tian, R. He, Y. Wang, and Q. S. Chen. "Numerical Analysis on the Ground Vibration Isolation of Duxseal." Advances in Civil Engineering 2019 (December 24, 2019): 1–10. http://dx.doi.org/10.1155/2019/6507465.

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A new kind of vibration screening material, Duxseal, with a high damping ratio is proposed to be used as an active vibration barrier in the free field. To investigate the influence of width, thickness, and embedded depth of using Duxseal on vibration reduction, numerical studies are performed using a three-dimensional (3D) semianalytical boundary element method (BEM) combined with a thin-layer method (TLM). The isolation effectiveness of Duxseal in ground vibration is also compared with the traditional wave impeding block (WIB). The numerical results show that Duxseal performed exceedingly well in screening ground vibrations in the free field. The effectiveness of the vibration isolation increases with the increase in the width, thickness, and embedded depth of the Duxseal material, within a certain range, under harmonic vertical excitation. In addition, Duxseal is much more effective for isolating ground vibration than the traditional WIB. The performance of Duxseal in isolating ground vibration is relatively stable along the distance away from the vibration source, while the amplitude attenuation ratio bounces upward when the distance away from the vibration source increases for the WIB isolation system.
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Liu, Yujun, Jing Liu, Guang Pan, Qiaogao Huang, and Liming Guo. "Dynamic Analysis of an Autonomous Underwater Glider with Single- and Two-Stage Vibration Isolators." Journal of Marine Science and Engineering 10, no. 2 (2022): 162. http://dx.doi.org/10.3390/jmse10020162.

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Vibrations from the power system can significantly affect the working performances (ocean observation) of autonomous underwater gliders (AUGs). In order to reduce the vibration transmission from vibration sources to the precision instruments in AUGs, single- and two-stage vibration isolator rings are designed in this paper. The dynamic models of the single- and two-stage vibration isolation of the AUG are presented. The force transmission ratio of the AUG is calculated in MATLAB code. The influences of the isolator and the structure stiffness are analyzed. The dynamic stiffness of the designed isolators, as an important design parameter, is calculated using the finite element method. The influence of the designed parameter on the dynamic stiffness of the rubber ring isolator is discussed. The coupled vibro-acoustic finite element method is used to analyze the vibration and acoustic response of an AUG with the single- and two-stage vibration isolators. The insertion loss is calculated in order to assess the vibration isolation performance of the single- and two-stage vibration isolators. The results from the dynamic models and the finite element models both show that the vibration isolation performance of the two-stage vibration isolator ring performs better than that of the single-stage vibration isolator ring.
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Ivanov, Yu V., and R. R. Gabdrahmanov. "Improving the Working Conditions of the Personnel of the Pneumatic Forging Hammer according to Vibration Parameters." Occupational Safety in Industry, no. 1 (January 2023): 55–59. http://dx.doi.org/10.24000/0409-2961-2023-1-55-59.

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Forging and stamping production is the basis of the procurement base of mechanical engineering. A variety of forging and pressing equipment ensures the production of most of the stampings and forgings used at the blank production stage. Working conditions in the forging shops are traditionally far from perfect. The main reasons for this are the number of unfavorable factors present in the forging shops, the main ones being noise and vibration, which most negatively affect the maintenance personnel. The article focuses its main attention on the evaluation of the vibrational activity of forging and pressing machines. It is indicated that vibration-isolating installations for stamping and forging hammers were developed. There are no such installations for pneumatic forging hammers. The results are given concerning the study on the design of a vibration-isolating installation for pneumatic forging hammers as a type of vibration-active equipment. To reduce the vertical vibrations of this equipment, multi-leaf springs are used, which efficiently reduce vibrations and have a long service life. Performance of the vibration isolating structure is ensured by installing a hammer on an intermediate frame supported by the springs installed in the foundation pit. The frame eliminates the rocking of the hammer and provides a uniform load on the spring. Parametric analysis of the vibration isolation unit showed that when the stiffness of the shock absorbers used is changed, the vibration activity of the machine can be reduced. A vibration-isolating installation for a forging pneumatic hammer, designed to improve the working conditions of personnel, was developed and successfully tested in production. Thanks to this installation, the vibration activity of the machine was significantly reduced and brought into line with sanitary standards, which improved the working conditions of the blacksmith and his assistant. Efficiency of vibration isolation is not changing in all modes of the hammer operation. The developed design is recommended for wide implementation in forging shops to improve the vibration characteristics of the hammer and to provide the possibility of placing such machines near vibration-sensitive objects.
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Cao, Hao, Yaopeng Chang, Jiaxi Zhou, et al. "High-Efficiency Vibration Isolation for a Three-Phase Power Transformer by a Quasi-Zero-Stiffness Isolator." Shock and Vibration 2021 (April 20, 2021): 1–11. http://dx.doi.org/10.1155/2021/5596064.

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The vibrations generated by a three-phase power transformer reduce the comfort of residents and the service life of surrounding equipment. To resolve this tough issue, a quasi-zero-stiffness (QZS) isolator for the transformer is proposed. This paper is devoted to developing a QZS isolator in a simple way for engineering practices. The vertical springs are used to support the heavy weight of the transformer, while the oblique springs are employed to fulfill negative stiffness to neutralize the positive stiffness of the vertical spring. Hence, a combination of the vertical and oblique spring can yield high static but low dynamic stiffness, and the vibration isolation efficiency can be improved substantially. The dynamic analysis for the QZS vibration isolation system is conducted by the harmonic balance method, and the vibration isolation performance is estimated. Finally, the prototype of the QZS isolator is manufactured, and then the vibration isolation performance is tested comparing with the linear isolator under real power loading conditions. The experimental results show that the QZS isolator prominently outperforms the existing linear isolator. This is the first time to devise a QZS isolator for three-phase power transformers with heavy payloads in engineering practices.
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Dissertations / Theses on the topic "Vibration isolation"

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Yan, Bo. "Active vibration isolation with a distributed parameter isolator." Thesis, University of Southampton, 2007. https://eprints.soton.ac.uk/51281/.

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Conventional vibration isolators are usually assumed to be massless for the purpose of modelling. This simplification tends to overestimate the isolator performance because of neglecting the internal resonances (IRs) due to the distributed mass effects in the isolator, which is especially important for lightly damped metallic isolators. Previous research on the problem of IRs is not particularly comprehensive, because it does not clarify the characteristics of the distributed parameter isolator. Furthermore, with the development of active vibration isolation, there is a need to investigate the effects of isolator IRs on the control performance and stability for commonly used control strategies. Effective ways to attenuate these effects are also required. This thesis concerns the active vibration isolation of a piece of delicate equipment mounted on a distributed parameter isolator, which is modelled as different idealised configurations under various types of deformation. The model is first developed to determine the effects of IRs on a single-degree-of-freedom system with a distributed parameter isolator. This analysis is then extended to include the resonance behaviour of the supporting structure. Simple expressions are derived which describe the behaviour of various types of distributed parameter isolator. The parameters which control the isolator performance at various frequencies are clarified theoretically and experimentally. The effects of IRs on control performance and stability of several control strategies are determined and compared. Absolute Velocity Feedback (AVF) control is shown to be the optimal solution to minimise the mean square velocity of the equipment mass supported by a distributed parameter isolator. A stability condition for an AVF control system containing a distributed parameter isolator is proposed. Based on this condition, different approaches to stabilize such a control system are presented. Experimental work is carried out to validate the theoretical results. Based on the improved knowledge of the characteristics of IRs in the distributed parameter isolator, different approaches which can suppress the IRs are proposed. AVF control with more damping in the isolator is demonstrated to be effective in attenuating the IRs theoretically and experimentally. Absolute velocity plus acceleration feedback control and AVF control on a fraction of the isolator length are also shown theoretically to be effective ways to attenuate the IRs and improve the isolation performance over a broad range of frequencies.
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McKinnell, Robert James. "Active isolation of vibration." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.306465.

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Sidbury, Jenny Elizabeth. "Analysis of Buckled and Pre-bent Columns Used as Vibration Isolators." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/9641.

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Vibrations resulting from earthquakes, machinery, or unanticipated shocks may be very damaging and costly to structures. To avoid such damage, designers need a structural system that can dissipate the energy caused by these vibrations. Using elastically buckled struts may be a viable means to reduce the harmful effects of unexpected vibrations. Post-buckled struts can support high axial loads and also act as springs in a passive vibration isolation system by absorbing or dissipating the energy caused by external excitation. When a base excitation is applied, the buckled strut may act to reduce the dynamic force transmitted to the system, thus reducing the structural damage to the system. Several models of buckled and pre-bent struts are examined with different combinations of parameters and end conditions. The models include pinned or fixed columns supporting loads above their buckling load, and columns with an initial curvature supporting various loads. The varying parameters include external damping, internal damping, and stiffness. The columns will be subjected to simple harmonic motion applied at the base or to a multi-frequency base excitation. The response of each model is measured by the deflection transmissibility of the supported load over a large range of frequencies. Effective models reduce the motion of the supported load over a large range of frequencies.<br>Master of Science
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Lee, Junyi. "Vibration isolation with periodic structures." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/33338.

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Vibrations are undesirable and cause many problems in engineering. Among the many techniques to reduce vibrations, phononic crystals and elastic metamaterials, that have periodic variations in geometry or material properties, have the potential to attenuate vibrations over a large range of frequencies. These classes of materials attenuate vibrations via the band gap mechanism that stops elastic waves from propagating. Additionally, periodic structures can possess high effective stiffness or strength to density ratios. This makes them ideal for lightweight structural applications. Furthermore, their periodic nature allows band gaps to be generated in them. These features can be combined to produce lightweight structural components with vibration isolation properties. Currently, very few studies of this class of materials for practical applications were made. Therefore, the goal of the work done in this thesis is to develop techniques and perform analyses to promote their implementation. A literature review has been performed on the techniques to determine the band structures and effective properties of lattice materials. A novel method coined the wave superposition method (WSM) to measure the band structure was developed. This method allows band structures to be determined experimentally using simple equipment with a small number of measurements. The method was then validated experimentally. A parametric study on the mechanical and dispersion properties of cubic lattice structures were conducted to assess the viability of designing a multifunctional lattice structure with excellent properties to be used as multifunctional lightweight and vibration attenuating components. Important trends relating to the geometric parameters to the performance of the lattice structures were found. Lastly, an experimental study was performed on a selected design to demonstrate the vibration attenuation characteristic of this material. The techniques and findings in this thesis, have laid the foundations for future development of periodic structures for both structural and vibration isolation applications.
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Sciulli, Dino. "Dynamics and Control for Vibration Isolation Design." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/30511.

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The single-degree-of-freedom (SDOF) system is the most widely used model for vibration isolation systems. The SDOF system is a simple but worthy model because it quantifies many results of an isolation system. For instance, a SDOF model predicts that the high frequency transmissibility increases when the isolator has passive damping although this does not occur for an isolator implementing active damping. A severe limitation of this system is that it cannot be used when the base and/or equipment are flexible. System flexibility has been considered in previous literature but the flexibility has always been approximated which leads to truncation errors. The analysis used in this work is more sophisticated in that it can model the system flexibility without the use of any approximations. Therefore, the true effects of system flexibility can be analyzed analytically. Current literature has not fully explored the choice of mount frequency or actuator placement for flexible systems either. It is commonly suggested that isolators should be designed with a low-frequency mount. That is, the isolator frequency should be much lower than any of the system frequencies. It is shown that these isolators tend to perform best in an overall sense; however, mount frequencies designed between system modes tend to have a coupling effect. That is, the lower frequencies have such a strong interaction between each other that when isolator damping is present, multiple system modes are attenuated. Also, when the base and equipment are flexible, isolator placement becomes a critical issue. For low-frequency mount designs, the first natural frequency can shift as much as 15.6% for various isolator placements. For a mid-frequency mount design, the shift of the first three modes can be as high as 34.9%, 26.6% and 11.3%, respectively, for varying isolator placements. NOTE: (03/2011) An updated copy of this ETD was added after there were patron reports of problems with the file.<br>Ph. D.
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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 assist the isolator selection process. Several sample cases in six degree of freedom are designed for a sample excitation and for sample assumptions defined for an inertial measurement unit. Different optimization methods for design optimizations are initially compared and then different designs are arranged according to the optimization results using isolators from catalogues for these sample cases. In the next step, the probable designs are compared according to their isolator characteristics. Finally, one of these designs are selected for each case, taking into account both the probable location deviations and property deviations of isolators.
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Ahmed, Abu Hanieh. "Multi degrees of freedom vibration isolation." Doctoral thesis, Universite Libre de Bruxelles, 2001. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211553.

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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 para avaliar a efetividade de um sistema de isolamento: a transmissibilidade e a potência. Neste trabalho foi utilizada a potência, sendo esta uma metodologia mais geral que pode ser facilmente utilizada em sistemas complexos, mas que tem a desvantagem de ser de difícil avaliação experimental. Nesta tese, serão simulados numericamente vários sistemas de isolamento passivo por componentes rígidos ou flexíveis, os quais serão modelados por suas respectivas matrizes de mobilidade ou impedância. Estas matrizes serão obtidas por métodos analíticos ou numéricos dependendo da conveniência de cada caso específico. Os projetos tradicionais de sistemas de isolamento geralmente consideram uma excitação unidirecional e avaliam somente algumas componentes da resposta do sistema, isso devido as limitações impostas pelo conceito da transmisibilidde usados nesses projetos. Além disso, eles não dão a devida importância a alguns parâmetros essenciais de configuração geométrica do sistema (localização e ângulo de inclinação dos isoladores, localização dos apoios de base, etc.). No presente trabalho, será mostrada a relevância desses parâmetros mencionados anteriormente no processo de busca das configurações ótimas e também se verá como essas configurações são fortemente dependentes do tipo de excitação do sistema, para isso serão utilizadas combinações de excitações harmônicas multidirecionais.<br>Vibration isolation systems are used in a large variety of applications (automotive, buil- dings, spatial structures such as aircrafts, satellites and in rotating machines) in order to reduce the transmission of mechanical vibrations from the equipments toward the foun- ation or viceversa. An isolation is obtained inserting a mechanical component (isolator) that acts as a link between the source subsystem and the isolated subsystem. There are two quantities generally used to evaluate the e®ectiveness of a isolation system: the trans-missibility and the power transmitted. In this work, it has been used the power, being this the most generic methodology that can be easily used in complex systems, but it has the disadvantage of a di±cult experimental validation. In this thesis, it will be studied numerically several passive isolation systems with rigid or °exible components, these will be modeled by theirs mobility or impedance matrices. This matrices are achieved by analytical or numerical methods depending of the convenience in each case. Generally traditional projects of isolation systems consider a unidirectional excitation and evaluate only some components of the response system, this occurs for the limitations in the trans-missibility use. Moreover, they do not give an appropriate attention to some parameters of geometrical con¯guration of the system (location and angle inclination of the isolators, location of the base supports, etc.). Herein, it will be shown the relevance of this pa-rameters in the search process of optimal con¯gurations and it will be also see how they depend strongly on the kind of the system excitation, so it will be used some combinations of multidirectional harmonic excitations.<br>Los sistemas de aislamiento de vibraciones son utilizados en una gran variedad de aplicaciones (automóbiles, edificios, extructuras espaciales como aeronaves y en máquinas rotativas) para reducir la transmisión de vibraciones mecánicas generadas por los equipos. Se obtiene un aislamiento insertando un componente mecánico (aislante) que desempeña el papel de vínculo entre el subsistema que contiene la perturbación y el subsistema que se desea aislar. Generalmente son dos las cantidades utilizadas para evaluar la efectividad de un sistema de aislamiento: la transmisibilidad y la potencia. En este trabajo se utiliza la potencia, pués al ser una metodología más general, puede ser utilizada en sistemas complejos, pero tiene la desventaja de ser de díficil evaluación experimental. En esta tesis, serán simulados numéricamente varios sistemas de aislamiento pasivo por componentes rígidos o flexibles, que serán modelados por sus respectivas matrices de movilidad o impedancia. Estas matrices se obtendrán por métodos analíticos o numéricos según convenga. Los proyectos tradicionales de sistemas de aislamiento, debido a las limitaciones impuestas por el concepto de transmisibilidad utilizada, consideran una excitación unidireccional y evalúan solamente algunas componentes de la respuesta del sistema. Además de eso, ellos no dan la debida importancia a algunos parámetros escenciales de configuración geométrica del sistema (localización y ángulo de inclinación de los aislantes, localización de los apoyos de base, etc.). En este trabajo, se muestra la relevancia de los parámetros mencionados anteriormente en el proceso de búsqueda de las configuraciones óptimas y también se verá como esas configuraciones son fuertemente dependientes del tipo de exitación del sistema. Para esto se utilizaran combinaciones de exitaciones armónicas multidireccionales.
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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 correta para manter a integridade física dos poços e evitar a produção prematura de hidrocarbonetos. Além disso, suas propriedades reológicas devem garantir a capacidade de arraste das partículas de rocha geradas durante o processo de perfuração, com um mínimo de potência de bombeamento. Tais particularidades requerem fluidos com baixas viscosidades a altas taxas de cisalhamento, que ocorrem em regiões próximas à parede, e altas viscosidades quando as taxas de deformação são baixas, o que ocorre na vizinhança do cascalho. Materiais viscoplásticos apresentam este tipo de comportamento. Portanto, o sucesso do processo de extração do petróleo depende do conhecimento e controle das propriedades reológicas dos fluidos de perfuração, as quais são fortemente dependentes da temperatura. Por esse motivo, a determinação do campo de temperatura no fluido de perfuração em escoamento faz-se necessária ainda em nível de projeto, o que só é possível com o conhecimento dos coeficientes de troca de calor. Estuda-se neste trabalho o problema da transferência de calor na região de entrada de escoamentos laminares de fluidos viscoplásticos através de espaços anulares. O comportamento do material é representado pelo modelo do fluido Newtoniano generalizado, com a função viscosidade descrita pela equação de Herschel-Bulkley. As equações de conservação são resolvidas numericamente via o método de volumes finitos. Investigam-se os efeitos (no coeficiente de troca de calor) da tensão limite de escoamento, índice power-law, razão de aspecto e dos números adimensionais de Reynolds e Peclet. Dentre outras conclusões, mostra-se que o números de Nusselt é uma função muito fraca das propriedades reológicas, desviando-se muito pouco dos valores Newtonianos. Surpreendentemente, esta conclusão contrasta-se fortemente com o comportamento observando em escoamentos de materiais viscoplásticos através de tubos. Convém enfatizar a importância desse fato no que tange a projetos de processos.<br>There are many industries that use in their processes viscoplastic materials. These materials have properties that strongly depend on temperature. It is not uncommon to find processes involving the non-isothermal flow of viscoplastic materials. For these cases, heat transfer information is needed to allow reliable process designs. Drilling muds are typically aqueous suspensions and, consequently, viscoplastic in nature. They must have the correct density to provide the pressure needed for well integrity, and for avoiding premature production of hydrocarbons. Their rheological properties must be such as to aloe carrying the drill chips with a minimum of pumping power. This requires a highly shear-thinning rheological behavior. Also, the success of a well cementing operation depends to a great extent on the knowledge and control of cement rheological properties, which are also temperature dependent. In this work, heat transfer in the entrance-region flow of viscoplastic materials through annular spaces is analyzed. The flow is laminar, and the material is assumed to behave as a Generalized Newtonian fluid, with a Herschel-Bulkley viscosity function. The conservation equations are solved numerically via a finite volume method. The effect on heat transfer of yield stress, power-law exponent, aspect ratio and dimensionless Peclet and Reynolds numbers is investigated. Among other findings, it is shown that the Nusselt number is a rather weak function of the rheological properties, deviating very little from the Newtonian values. Surprisingly, this stands in strong contrast to the behavior observed for flows of viscoplastic materials through tubes. It is worth noting that this finding has important consequences in process design.
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Favor, Helen McCusker. "Two Dimensional Analysis of Vibration Isolation of Rigid Bar Supported by Buckled or Pre-bent Struts." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/36099.

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The purpose of this research is to study a new type of vibration isolator, utilizing the post-buckled stiffness of elastic struts (or columns). The advantage of the post-buckled state is that ideally it can support more static load with a relatively small static deflection than traditional vibration isolators such as springs or rubber mounts, but can also exhibit a low axial stiffness when dynamic excitation is introduced. Three models consisting of buckled or pre-bent struts serving as vibration isolators which support a rigid bar are examined in this research. The three cases studied are 1) two buckled struts supporting a symmetric rigid bar, 2) two buckled struts supporting an asymmetric rigid bar, and 3) two pairs of buckled struts with a bonded filler supporting a symmetric rigid bar. The models are subjected to a harmonic excitation at the base, and external damping is included. The struts in all cases are modeled as an elastica, and the boundary conditions are clamped/clamped for all cases. Because the purpose of the struts is to reduce unwanted vibrations, determining the displacement transmissibility of the system is the main goal of this research. Transmissibility versus frequency plots are generated for all cases, with varying parameters such as stiffness, damping, and location of center of mass, to determine how they affect the behavior of the struts. Models that produce a large range of frequencies at which the transmissibility is well below unity are the most effective. Vibration shapes are also determined for certain frequencies so that the physical behavior of the system can be studied.<br>Master of Science
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Books on the topic "Vibration isolation"

1

Passive vibration isolation. ASME Press, 2003.

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Wells, Bradley Gordon. Inflated elastomer toroid vibration isolation mount. National Library of Canada, 1996.

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

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United States. National Aeronautics and Space Administration., ed. Microgravity vibration isolation technology: Development to demonstration. National Aeronautics and Space Administration, 1993.

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Huang, Wei, and Jian Xu. Optimized Engineering Vibration Isolation, Absorption and Control. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-2213-0.

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Oran, Nicks Colby, and Langley Research Center, eds. Six degree-of-freedom "live" isolation system tests. National Aeronautics and Space Administration, Langley Research Center, 1986.

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Oran, Nicks Colby, and Langley Research Center, eds. Six degree-of-freedom "live" isolation system tests. National Aeronautics and Space Administration, Langley Research Center, 1986.

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David, Hampton Roy, and United States. National Aeronautics and Space Administration., eds. Microgravity vibration isolation: Optimal preview and feedback control. National Aeronautics and Space Administration, 1991.

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Beavers, George D. System identification of an ultra-quiet vibration isolation platform. Naval Postgraduate School, 1997.

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F, Lubomski Joseph, Logsdon Kirk A, and United States. National Aeronautics and Space Administration., eds. Vibration isolation technology: An executive summary of systems development and demonastration. National Aeronautics and Space Administration, 1993.

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Book chapters on the topic "Vibration isolation"

1

Kelly, James M. "Vibration Isolation." In Earthquake-Resistant Design with Rubber. Springer London, 1997. http://dx.doi.org/10.1007/978-1-4471-0971-6_2.

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Kelly, James Marshall. "Vibration Isolation." In Earthquake-Resistant Design with Rubber. Springer London, 1993. http://dx.doi.org/10.1007/978-1-4471-3359-9_2.

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Soueid, Ahmad, E. Clayton Teague, and James Murday. "Vibration Isolation." In Buildings for Advanced Technology. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-24892-9_4.

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Virgin, Lawrie. "Vibration Isolation." In Exploiting Nonlinear Behavior in Structural Dynamics. Springer Vienna, 2012. http://dx.doi.org/10.1007/978-3-7091-1187-1_3.

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Preumont, A. "Vibration Isolation." In Vibration Control of Active Structures. Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-2033-6_8.

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Preumont, André. "Vibration Isolation." In Vibration Control of Active Structures. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-72296-2_8.

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Novillo, Ernesto. "Vibration Isolation." In Vibration Control Engineering. CRC Press, 2021. http://dx.doi.org/10.1201/9781003175230-11.

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Harris, David A. "Vibration Isolation Materials." In Noise Control Manual. Springer US, 1991. http://dx.doi.org/10.1007/978-1-4757-6009-5_6.

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Cao, Qingjie, and Alain Léger. "An Isolator: Dynamics and Vibration Isolation." In Springer Tracts in Mechanical Engineering. Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-53094-8_14.

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Dresig, Hans, and Franz Holzweißig. "Foundation and Vibration Isolation." In Dynamics of Machinery. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-89940-2_3.

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Conference papers on the topic "Vibration isolation"

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Jiang, Rong-Jun, and Shi-Jian Zhu. "Vibration Isolation and Chaotic Vibration." 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-48589.

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Taking single degree of freedom vibration isolation system under simple harmonic excitation as an example, and considering the energy, the vibration isolation performance in different conditions was studied theoretically and numerically. The results shows that when the simple harmonic excitation import energy is definite, the vibration isolation performance at the primary harmonic frequency of the nonlinear vibration isolation system is better than that of the linear system, and the vibration isolation performance of the nonlinear vibration isolation system in chaotic vibration state is much better than that in non-chaotic vibration state. For the same isolated object, if can let the vibration isolation system vibrate chaotically, the system will possess the best isolation performance at the primary frequency.
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Scarborough, Lloyd H., Christopher D. Rahn, and Edward C. Smith. "Fluidic Composite Tunable Vibration Isolators." In ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2010. http://dx.doi.org/10.1115/smasis2010-3683.

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Coupling a Fluidic Flexible Matrix Composite (F2MC) to an air-pressurized fluid port produces a fundamentally new class of tunable vibration isolator. This device provides significant vibration reduction at an isolation frequency that can be tuned over a broad frequency range. The material properties and geometry of the F2MC element, as well as the port inertance, determine the isolation frequency. A unique feature of this device is that the port inertance depends on pressure so the isolation frequency can be adjusted by changing the air pressure. For constant port inertance, the isolation frequency is largely independent of the isolated mass so the device is robust to changes in load. A nonlinear model is developed to predict isolator length and port inertance. The model is linearized and the frequency response calculated. Experiments agree with theory, demonstrating a tunable isolation range from 9 Hz to 36 Hz and minimum transmitted force reductions of 90% at the isolation frequency.
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Oh, Hyun-Ung, and Kenji Minesugi. "Semiactive ER isolator for momentum-wheel vibration isolation." In 19th AIAA Applied Aerodynamics Conference. American Institute of Aeronautics and Astronautics, 2001. http://dx.doi.org/10.2514/6.2001-1313.

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Vukobratovich, Daniel. "Principles Of Vibration Isolation." In 1st Int'l Conf on Vibrational Control in Optics and Metrology, edited by Lionel R. Baker and Daniel Vukobratovich. SPIE, 1987. http://dx.doi.org/10.1117/12.937905.

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Liu Fang, Pang Xiangyang, Liu Zhigang, Zhang Tao, Huang Hongbiao, and Zhu Jianqiang. "Negative-stiffness vibration isolation." In 2010 IEEE 3rd International Nanoelectronics Conference (INEC). IEEE, 2010. http://dx.doi.org/10.1109/inec.2010.5424594.

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Tryggvason, Bjarni V., S. E. Salcudean, W. Y. Stewart, and N. Parker. "Microgravity Vibration Isolation Mount." In International Conference On Environmental Systems. SAE International, 1994. http://dx.doi.org/10.4271/941364.

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Kumbalek, Mike. "Sustainable Vibration Isolation Compounds." In Technical Meeting of the Rubber Division, ACS. Rubber Division, ACS, 2022. http://dx.doi.org/10.52202/067657-0050.

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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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Kim, Seong Jin, Chen Chen, George Flowers, and Robert Dean. "Active Vibration Control and Isolation for Micro-Machined Devices." In ASME 2008 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2008. http://dx.doi.org/10.1115/smasis2008-423.

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Some harsh environments contain high frequency, high amplitude mechanical vibrations. Unfortunately some very useful components, such as MEMS gyroscopes, can be very sensitive to these high frequency mechanical vibrations. Passive micromachined silicon lowpass filter structures (spring-mass-damper) have been demonstrated in recent years. However, the performance of these filter structures is typically limited by low damping. This is especially true if operated in low pressure environments, which is often the optimal operating environment for the attached device that requires vibration isolation. An active micromachined vibration isolator can be realized by combining a state sensor, and electrostatic actuator and feedback electronics with the passive isolator. Using this approach, a prototype active micromachined vibration isolator is realized and used to decrease the filter Q from approximately 135 to approximately 60, when evaluated in a low pressure environment. The physical size of these active isolators is suitable for use in or as packaging for sensitive electronic and MEMS devices, such as MEMS vibratory gyros.
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Ponslet, E., and M. Eldred. "Discrete optimization of isolator locations for vibration isolation systems." In 6th Symposium on Multidisciplinary Analysis and Optimization. American Institute of Aeronautics and Astronautics, 1996. http://dx.doi.org/10.2514/6.1996-4178.

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Reports on the topic "Vibration isolation"

1

Hart, Carl. Vibration survey of Room 47 with a laser doppler vibrometer : Main Laboratory Basement, U.S. Army ERDC-CRREL. Engineer Research and Development Center (U.S.), 2020. http://dx.doi.org/10.21079/11681/38919.

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Plans are underway to create an acousto-optic laboratory on the campus of the Cold Regions Research and Engineering Laboratory. For this purpose, existing space in the basement of the Main Laboratory will be renovated. Demanding measurement techniques, such as interferometry, require a sufficiently quiet vibration environment (i.e., low vibration levels). As such, characterization of existing vibration conditions is necessary to determine vibration isolation requirements so that highly sensitive measurement activities are feasible. To this end, existing vibro-acoustic conditions were briefly surveyed in Room 47, a part of the future laboratory. The survey measured ambient noise and ambient vertical floor vibrations. The ambient vibration environment was characterized according to generic velocity criteria (VC), which are one-third octave band vibration limits. At the time of the survey, the ambient vibration environment fell under a VC-A designation, where the tolerance limit is 2000 μin/s across all one-third octave bands. Under this condition, highly sensitive measurement activities are feasible on a vibration-isolated working surface. The conclusion of this report provides isolation efficiency requirements that satisfy VC-E limits (125 μin/s), which are necessary for interferometric measurements.
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Wilke, Paul S., Conor D. Johnson, Patrick J. Grosserode, and Dino Sciulli. Whole-Spacecraft Vibration Isolation on Small Launch Vehicles. Defense Technical Information Center, 2000. http://dx.doi.org/10.21236/ada476252.

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Ponslet, E. R., and M. S. Eldred. Discrete optimization of isolator locations for vibration isolation systems: An analytical and experimental investigation. Office of Scientific and Technical Information (OSTI), 1996. http://dx.doi.org/10.2172/244592.

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Kelso, Shawn P., Ross Blankinship, and Benjamin K. Henderson. Precision Controlled Actuation and Vibration Isolation Utilizing Magnetorheological (MR) Fluid Technology. Defense Technical Information Center, 2001. http://dx.doi.org/10.21236/ada451646.

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

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Chu, Wei-Kan. Passive, Portable Vibration Isolation by Means of Permanent Magnets and High Temperature Superconductors. Defense Technical Information Center, 1995. http://dx.doi.org/10.21236/ada304083.

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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. Defense Technical Information Center, 2010. http://dx.doi.org/10.21236/ada564585.

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Hardesty, Sean, Drew Kouri, Payton Lindsay, Denis Ridzal, Brian Stevens, and Ryan Viertel. Shape Optimization for Control and Isolation of Structural Vibrations in Aerospace and Defense Applications. Office of Scientific and Technical Information (OSTI), 2020. http://dx.doi.org/10.2172/1669731.

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Mizrach, Amos, Michal Mazor, Amots Hetzroni, et al. Male Song as a Tool for Trapping Female Medflies. United States Department of Agriculture, 2002. http://dx.doi.org/10.32747/2002.7586535.bard.

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This interdisciplinaray work combines expertise in engineering and entomology in Israel and the US, to develop an acoustic trap for mate-seeking female medflies. Medflies are among the world's most economically harmful pests, and monitoring and control efforts cost about $800 million each year in Israel and the US. Efficient traps are vitally important tools for medfly quarantine and pest management activities; they are needed for early detection, for predicting dispersal patterns and for estimating medfly abundance within infested regions. Early detection facilitates rapid response to invasions, in order to contain them. Prediction of dispersal patterns facilitates preemptive action, and estimates of the pests' abundance lead to quantification of medfly infestations and control efforts. Although olfactory attractants and traps exist for capturing male and mated female medflies, there are still no satisfactorily efficient means to attract and trap virgin and remating females (a significant and dangerous segment of the population). We proposed to explore the largely ignored mechanism of female attraction to male song that the flies use in courtship. The potential of such an approach is indicated by studies under this project. Our research involved the identification, isolation, and augmentation of the most attractive components of male medfly songs and the use of these components in the design and testing of traps incorporating acoustic lures. The project combined expertise in acoustic engineering and instrumentation, fruit fly behavior, and integrated pest management. The BARD support was provided for 1 year to enable proof-of-concept studies, aimed to determine: 1) whether mate-seeking female medflies are attracted to male songs; and 2) over what distance such attraction works. Male medfly calling song was recorded during courtship. Multiple acoustic components of male song were examined and tested for synergism with substrate vibrations produced by various surfaces, plates and loudspeakers, with natural and artificial sound playbacks. A speaker-funnel system was developed that focused the playback signal to reproduce as closely as possible the near-field spatial characteristics of the sounds produced by individual males. In initial studies, the system was tasted by observing the behavior of females while the speaker system played songs at various intensities. Through morning and early afternoon periods of peak sexual activity, virgin female medflies landed on a sheet of filter paper at the funnel outlet and stayed longer during broadcasting than during the silent part of the cycle. In later studies, females were captured on sticky paper at the funnel outlet. The mean capture rates were 67 and 44%, respectively, during sound emission and silent control periods. The findings confirmed that female trapping was improved if a male calling song was played. The second stage of the research focused on estimating the trapping range. Initial results indicated that the range possibly extended to 70 cm, but additional, verification tests remain to be conducted. Further studies are planned also to consider effects of combining acoustic and pheromonal cues.
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