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The wave and vibratory power transmission in a finite L-shaped Mindlin plate with two simply supported opposite edges

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Acta Mechanica Sinica 2011年第5期27卷 785-795页

作者： Chun-Chuan Liu Feng-Ming Li Ting-Wei Liang Wen-Hu Huang P. O. Box 137 School of AstronauticsHarbin Institute of Technology150001 Harbin China

In this paper,wave and vibratory power transmission in a finite L-shaped Mindlin plate with two simply supported opposite edges are investigated using the wave *** dynamic responses,active and reactive power flow in the finite plate are calculated by the Mindlin plate theory （MPT） and classic plate theory （CPT）.To satisfy the boundary conditions and continuous conditions at the coupled junction of the finite L-shaped plate,the near-field and far-field waves are entirely contained in the wave *** in-plane longitudinal and shear waves are also *** results indicate that the vibratory power flow based on the MPT is different from that based on the CPT not only at high frequencies but also at low and medium *** influence of the plate thickness on the vibrational power flow is *** the results it is seen that the shear and rotary inertia correction of the MPT can influence the active and reactive power at the junction of the L-shaped plate not only at high frequencies but also at low and medium ***,the effects of structural damping on the active and reactive power flow at the junction are also analyzed.

关键词： Finite L-shaped Mindlin plate Active power flow Reactive power flow wave approach

Structure-Borne Sound Attenuation at Corner Interface with Dynamic Vibration Absorber Attached

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Journal of Shanghai Jiaotong university(Science) 2011年第6期16卷 750-758页

作者：车驰东陈端石 State Key Laboratory of Ocean Engineering School of Naval ArchitectureOcean and Civil Engineering Shanghai Jiaotong University

Structure-borne sound attenuation at corner interface of two plates with dynamic vibration absorber attached is investigated by wave *** governing transmission and reflection coefficients are deduced by introducing some non-dimensional coefficients,which help to reveal the physical sense inside and to simplify the *** investigation on vibration energy transmission of bending wave is carried out as *** results from measurement and prediction show almost the same trends in the simplified *** is found that energy transmission at corner interface depends greatly on whether the dynamic vibration absorber attached acts at resonance and is relatively lower right after the nature frequency of dynamic vibration ***,the dynamic vibration absorber attached provides less energy transmission of bending wave than blocking mass at the end of "passing band".

关键词： structure-borne sound dynamic vibration absorber non-dimensional coefficients wave approach corner interface

Analysis of the effect of blocking mass at corner interface of two plates at arbitrary angles on transmission of plane bending waves

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Chinese Journal of Acoustics 2007年第4期26卷 367-377页

作者： CHE Chidong CHEN Duanshi School of Naval Architecture Ocean & Civil Eng. Shanghai Jiao Tong University Shanghai 200030

Vibration energy transmission at corner interface of two infinite plates rigidly jointed at arbitrary angles was studied by wave approach so as to investigate the effect of blocking mass used for reducing plane bending wave transmission. Two local coordinate systems were introduced and six new non-dimensional coefficients implying corresponding ratio governing characteristic impedances of plates or blocking mass were introduced to simplify formulations of transmission and reflection coefficients. Five samples were tested in experiment. Discussions were carried out based on the comparison between prediction and experiment in terms of insertion loss. It is concluded that blocking mass at corner interface acts like a ＂lowpass filter＂, effective for vibration attenuation above certain frequency. The value of TL and IL in ＂attenuation band＂ depends mainly on mass per unit length and band width of ＂attenuation band＂ on mass moment of inertia per unit length of the blocking mass.

关键词： reflection coefficients energy transmission coordinate systems wave transmission moment of inertia insertion loss wave approach band width