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Dynamic characteristics of nonlinear vibration isolator for gas turbine

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International Journal of Mechanical System Dynamics 2024年第3期4卷 374-383页

作者： Teng Wang Linhan Feng Lei Zhang Chunhui Zhang Yue Wu Naval Research Institute BeijingChina

In this study,a theoretical model of the vibration isolation system of the gas turbine is developed and numerically solved.A simplified finite element(FE)model was also established to determine the response under the shock *** results of the FE model are used to verify the effectiveness of the theoretical model and the numerical *** influence of isolator stiffness,vibration isolator damping,and vibration isolator nonlinear stiffness coefficient on the shock response of the vibration isolation system is studied using the controlled-variable *** parameters(stiffness,damping,and nonlinear coefficient)enter into the shock resistance design of gas turbine vibration isolators.

关键词： gas turbine vibration isolator theoretical model damping dynamic characteristics

Nonlinear analysis of viscoelastic damper for the whole-spacecraft vibration isolator

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Nonlinear analysis of viscoelastic damper for the whole-spac...

FEA FOR STUDYING AND DESIGNING OF RUBBER vibration isolator

第十四届全国非线性振动暨第十一届全国非线性动力学和运动稳定性学术会议

作者： TAN Lijun FANG Bo QU Xiuquan HUANG Wenhu School of Astronautics Harbin Institute of Technology School of Mechanical and Electrical Engineering Harbin Institute of Technology

The dynamic environment of spacecraft is very complex during its ascent into *** severe vibration will result in resonant response causing fatigue damage and sensitive components *** of whole-spacecraft isolator is a direct and effective method to reduce the vibration to the satellite from the launch *** prominent features of elastomer render Visioelastic Material(VEM) extensively apply to vibration *** Damper(VED) is a dominating form for

关键词： Visioelastic Damper nonlinear vibration transmissibility vibration isolator

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FEA FOR STUDYING AND DESIGNING OF RUBBER VIBRATION ISOLATOR

Three-magnet-ring quasi-zero stiffness isolator for low-frequency vibration isolation

第五届国际振动工程会议

作者： Yi Tailian and Zhu Shijian Institute of Noise & vibration Naval University of Engineering Wuhan China 430033

＜正＞ Rubber is widely used in vibrationisolators due to its advantage of *** order todesign the desired rubber vibration isolators efficiently,it is necessary to study its mechanical properties underdifferent *** character of rubber materialshas great geometric and physical nonlinearity,thegeometry and boundary conditions of the rubber inisolators are very *** is almost impossible toobtain its analytical solution of its static or ***,a nonlinear FEA,which is aneffective numerical method,is called to solve theseproblems.

关键词： vibration isolator FEA Mooney- Rivlin rule

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International Journal of Mechanical System Dynamics 2024年第2期4卷 153-170页

作者： Shang Wang Lei Hou Qingye Meng Gengshuo Cui Xiaodong Wang School of Astronautics Harbin Institute of TechnologyHarbinChina Institute of Dynamics and Control Science Shandong Normal UniversityJinanChina

A three-magnet-ring quasi-zero stiffness(QZS-TMR)isolator is designed to solve the problem of low-frequency vibration isolation in the vertical direction of precision ***-TMR has both positive and negative stiffness *** positive stiffness structure consists of two mutually repelling magnetic rings and the negative stiffness structure consists of two magnetic rings nested within each *** modulating the relative distance between positive and negative stiffness structures,the isolator can have QZS *** with other QZS isolators,the QZS-TMR is compact and easy to *** addition,the working load of QZS-TMR can be flexibly adjusted by varying the radial widths of the inner magnetic *** this paper,the static analysis of QZS-TMR is carried out to guide the design,and the low-frequency vibration isolation performance is *** addition,the experimental prototype of QZS-TMR is designed and *** static and vibration isolation experiments are carried out on the *** results show that the initial vibration isolation frequency of the experimental prototype is about 4 *** results show an excellent low-frequency vibration isolation effect,which is consistent with the theoretical *** paper introduces a new approach to the design of the QZS isolator.

关键词： low-frequency vibration isolation magnet rings quasi-zero stiffness vibration isolator

Using a SVM to evaluate damage to vibration isolators in an elastic raft system

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Journal of Marine Science and Application 2007年第4期6卷 48-54页

作者： JIANG Feng FENG Qi School of A erospace Engineering and Applied Mechanics TongJi University Shanghai 200092 China

Predicting damage to vibration isolators in a raft experiencing heavy shock loadings from explosions is an important task when designing a raft system. It is also vital to be able to research the vulnerability of heavily shocked floating rafts unreliable, especially when the allowable values The conventional approach to prediction has been or ultimate values of vibration isolators of supposedly uniform standard in a raft actually have differing and uncertain values due to defective workmanship. A new model for predicting damage to vibration isolators in a shocked floating raft system is presented in this paper. It is based on a support vector machine（SVM）, which uses Artificial Intelligence to characterize complicated nonlinear mapping between the impacting environment and damage to the vibration isolators. The effectiveness of the new method for predicting damage was illustrated by numerical simulations, and shown to be effective when relevant parameters of the model were chosen reasonably. The effect determining parameters, including kernel function and penalty factors, has on prediction results is also discussed. It can be concluded that the SVM will probably become a valid tool to study damage or vulnerability in a shocked raft system.

关键词： elastic raft vibration isolator shock damage SVM

Mechanical properties of disc-spring vibration isolators based on boundary friction

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Journal of Southeast University(English Edition) 2014年第1期30卷 39-44页

作者：贾方张凡成东南大学机械工程学院南京210096

To ascertain the influence of the boundary friction on mechanical properties of disc-spring vibration isolators a load-displacement hysteresis curve formula of disc-spring vibration isolators is derived on the basis of the energy conservation law as well as considering the effect of the boundary *** formula is validated through the finite element analysis and static load *** this basis the effect of the boundary friction on the bearing capacity is researched. Then the dynamic performance of disc-spring vibration isolators is studied by dynamic *** experimental results indicate that the boundary friction can promise a larger damping with a ratio of 0.23 for disc-spring vibration *** with the loading frequency the loading amplitude has a greater impact on the energy consumption dynamic stiffness and damping of vibration *** research can provide valuable information for the design of disc-spring vibration isolators.

关键词： disc-spring vibration isolator boundary friction hysteresis curve dynamic stiffness damping finite element analysis FEA

Optimal Design and Mechanical Simulation of Rubber bushing with Convex Hull Structure Based on Bionics

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Journal of Bionic Engineering 2023年第5期20卷 2018-2029页

作者： Ce Liang Min Li Jicai Liang Shaoqiang Wang Qigang Han Yi Li Key Laboratory of Automobile Materials Ministry of Educationand College of Materials Science and EngineeringJilin UniversityChangchun130025China Roll Forging Research Institute Jilin UniversityChangchun130025China School of Computer Science and Technology Changchun UniversityChangchun130022China

Inspired by the safe landing of cats falling from high altitudes,a bionic flexible rubber bushing structure is proposed and its motion characteristics are systematically studied to explore its potential application in the suppression of *** convex hull structure on the bushing surface is abstracted from the cat’s claw pad,and the hyper-viscoelastic model is selected as the constitutive model of the rubber *** addition,the design with the best vibration damping effect is finally obtained by reasonably adjusting the amount of radial compression and distribution of bionic ***,under the same conditions,the test results of the dynamic characteristics of the bushing verify the accuracy of the simulation *** results show that the convex hull bionic structure designed in this paper can effectively change the motion characteristics of the rubber bushing under various working conditions,which provides new inspiration or potential possibility for the design of rubber bushing in the future.

关键词： Rubber bushing Bionic design Finite element analysis vibration isolator Radial compression

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航空用新型减振器

应用力学学报 2001年第Z1期18卷 110-113页

作者：葛祖德姚起杭飞机结构强度研究所西安710065

介绍了新型减振器的国内、外研制的概况。指出了新型减振器的优点 ,并介绍了新型减振器的类型、工作原理及应用。

关键词： high damping vibration isolator vibration control.

Design and experimental study of a compact quasi-zero-stiffness isolator using wave springs

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Science China(Technological Sciences) 2021年第10期64卷 2255-2271页

作者： WANG Qiang ZHOU JiaXi WANG Kai XU DaoLin WEN GuiLin State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Changsha 410082China College of Mechanical and Vehicle Engineering Hunan UniversityChangsha 410082China School of Mechanical and Electric Engineering Guangzhou UniversityGuangzhou 510006China

The quasi-zero-stiffness(QZS)vibration isolation has been proven to be an effective way to isolate low-frequency ***,most of the existing QZS isolators are space-consuming,which could not be employed in the space-limited *** this paper,a quite compact QZS isolator is engineered by connecting a pair of mutually repulsive magnet rings and a space-saving wave spring in parallel,called WQZS *** restoring force of the magnet ring is derived by the equivalent magnetic charge method,and an empirical formula for the restoring force of the wave spring is derived by the least squares method based on experimental *** dynamic model of the WQZS vibration isolation system is built,and the vibration isolation performance is evaluated through ***,an experimental prototype is fabricated,and the experimental tests on frequency sweep are carried *** results show that compared with the linear counterpart,the vibration isolation frequency of the WQZS isolator is reduced by 48.89%,and the peak transmissibility is decreased by 59.33%.Most importantly,the space occupancy of the WQZS isolator designed in this paper is much lower than that of the traditional QZS isolators,and thus it should be a potential solution for low-frequency vibration isolation in the space-limited environment.

关键词： quasi-zero-stiffness vibration isolator space saving magnet rings wave spring