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Analytical research on structural-acoustic coupling of a cavity surrounded by flexible panel

Chinese Journal of Acoustics 2007年第2期26卷 138-157页

作者： JIN Guoyong YANG Tiejun LIU Zhigang JI Zhenlin LIWanyou School of Power and Energy Engineering Harbin Engineering University Harbin 150001

The structural-acoustic coupling characteristics, mechanisms, effect of structuralacoustic coupling on natural mode and natural frequencies of the system are analyzed the- oretically and numerically. Formulae for the natural frequencies of the coupled system are derived. Some new conclusions are obtained. Analytical results demonstrate that the strongly coupled system indicates obvious closed-loop feedback characteristics, whereas the weakly cou- pled system indicates obvious feedforward characteristics, and it is because of the presence of the feedback loop that the natural characteristics and natural frequencies are changed. Cluster coupling characteristic between the structural and acoustic modes for the regular cavity and panel system is found, which determines the coupling interaction between the flexible panel and cavity. Any mode in one mode cluster only interferes the modes and the modal natural frequencies in the same cluster independently. The modal cluster coupling changes not only the natural frequencies of the system but also the modal order and structural mode shape.

关键词： natural frequencies coupled system feedback loop mode shape

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A NEW METHOD FOR FINDING THE natural FREQUENCY SET OF A LINEAR TIME-INVARIANT NETWORK

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Transactions of Tianjin University 1997年第2期3卷 28-35页

作者：吴雪孙雨耕天津大学电力及自动化工程系

This paper presents a new method for finding the natural frequency set of a linear time invariant network. In the paper deriving and proving of a common equation are described. It is for the first time that in the common equation the natural frequencies of an n th order network are correlated with the n port parameters. The equation is simple and dual in form and clear in its physical meaning. The procedure of finding the solution is simplified and standardized, and it will not cause the loss of roots. The common equation would find wide use and be systematized.

关键词： n th order linear time invariant networks natural frequencies n ports

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Seismic analysis of a long-span continuous steel truss-arch bridge across the Yangtze River

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Journal of Civil Engineering and Architecture 2009年第5期3卷 1-8页

作者： XIA Chao-yi LEI Jun-qing XIA He PI Yong-lin School of Civil Engineering Beijing Jiaotong University Beijing 100044 China School of Civil ＆ Environmental Engineering The University of New South Wales Sydney 2052 Australia

In this paper, an FEM （Finite Element Method） model is established for the main span of the bridge, with the main box arch and suspender members modeled by beam elements, truss members by truss elements, and the orthotropic steel deck by plate elements. The natural frequencies and mode shapes are acquired by the eigen-parameter analysis. By input of a typical earthquake excitation to the bridge system, the dynamic responses of the bridge, including the displacement and accelerations of the main joints of the structure, and the seismic forces and stresses of the key members, are calculated by the structural analysis program, based on which the main laws of the seismic responses of the bridge are summarized, and the safety of the structure is evaluated.

关键词： FEM main span of the bridge natural frequencies the dynamic responses

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Dynamics Analysis of Cycloid Reducer

Dynamics Analysis of Cycloid Reducer

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中国机构与机器科学国际会议暨海峡两岸第四届机构学研讨会

作者：谢明 State Key Laboratory of Mechanical Transmission Chongqing University

传动过程的平稳性及良好的动力学特性对于运动传递的精确性和稳定性具有重要影响,开展摆线行星精密传动动力学理论研究将为评价和改善该传动的动力学特性提供依据。本文在简要介绍新型摆线行星传动地基础上,建立了该精密传动的动力学模... 详细信息

传动过程的平稳性及良好的动力学特性对于运动传递的精确性和稳定性具有重要影响,开展摆线行星精密传动动力学理论研究将为评价和改善该传动的动力学特性提供依据。本文在简要介绍新型摆线行星传动地基础上,建立了该精密传动的动力学模型,给出了系统多自由度动力学方程,详细研究了刚度矩阵的确定方法,推导了系统多阶固有频率计算公式;给出了计算实例,验证了理论分析的正确性。

关键词： Cycloid reducer Dynamic model natural frequencies

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Ambient Vibration Testings and Field Investigations of Two Historical Buildings in Europe

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Structural Durability & Health Monitoring 2020年第4期14卷 283-301页

作者： Ehsan Noroozinejad Farsangi Aleksandra Bogdanovic Zoran Rakicevic Angela Poposka Marta Stojmanovska Faculty of Civil and Surveying Engineering Graduate University of Advanced TechnologyKemmanIran Institute of Earthquake Engineering and Engineering Seismology-IZIIS University"Ss.Cyil and Methodius"SkopjeN.Macedonia

In this study,the methodology and results of ambient vibration-based investigations of the historical Tash Mosque in Kosovo and a 3-story historical building in Bulgaria are *** investi gations include full-scale in situ testing of both structures due to ambient vibrations induced by micro-seismic,wind,traffic,and other human *** this aim,Ranger seismometers and Kinemetric products were *** were performed in both horizontal directions in several points along the structures'height utilizing a high-speed data acquisition *** recorded data have been analyzed and processed by the software developed at IZIIS,and then the processed data were used as input for modal *** basic assumption is that the excitation can be considered as a stationary random process to have a relatively flat *** paper clearly describes the procedure used for investigations and presents the dynamic properties of the whole *** inv estigated structures are both historical buildings and defined as architectural heritage and the outcome of this study including the natural vibration frequencies and mode shapes)can be very benefi-cial for the verification stage of the analytical/numerical models for future retro-fiting/rehabilitation schemes.

关键词： Ambient vibrations natural frequencies mode shapes damping FFT analysis EFDD historical building

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