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STEADY STATE RESPONSE ANALYSIS ON HELICAL SPRING IMPACTED BY SHORT WAVE
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作者 FU Chaoxing WANG Xiulun +1 位作者 WANG Jirong LIU Dawei 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2006年第4期583-587,共5页
The wave transmission character of helical spring is applied to establish 2-DOF model of impacted vehicle on the wave impact theory. Considering the concrete structure of helical spring, corresponding responses under ... The wave transmission character of helical spring is applied to establish 2-DOF model of impacted vehicle on the wave impact theory. Considering the concrete structure of helical spring, corresponding responses under different impact frequency of the vehicle are imitated. The reason why the vehicle floor overresponds in some special frequency fields is explored based on analyzing the responses. When the impactions are in low frequency, the change of the spring has not been considered, but this does not affect the results. Because the transmission characters of velocity and acceleration are unanimous in helical spring, the responses characters of velocity and acceleration arc also unanimous, the only difference is the magnitude, which can make use of acceleration responses to analyse velocity responses. 展开更多
关键词 Short wave impact Wave transmission Vehicle response Helical spring
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Time-domain hydrodynamic analysis of pontoon-plate floating breakwater 被引量:4
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作者 Zhi-jie CHEN Yong-xue WANG +1 位作者 Hua-yang DONG Bin-xin ZHENG 《Water Science and Engineering》 EI CAS 2012年第3期291-303,共13页
The hydrodynamic behaviors of a floating breakwater consisting of a rectangular pontoon and horizontal plates are studied theoretically. The fluid motion is idealized as two-dimensional linear potential flow. The moti... The hydrodynamic behaviors of a floating breakwater consisting of a rectangular pontoon and horizontal plates are studied theoretically. The fluid motion is idealized as two-dimensional linear potential flow. The motions of the floating breakwater are assumed to be two-dimensional in sway, heave, and roll. The solution to the fluid motion is derived by transforming the governing differential equation into the integral equation on the boundary in time domain with the Green's function method. The motion equations of the floating breakwater are established and solved with the fourth-order Runge-Kutta method to obtain the displacement and velocity of the breakwater. The mooring forces are computed with the static method. The computational results of the wave transmission coefficient, the motion responses, and the mooring forces of the pontoon-plate floating breakwater are given. It is indicated that the relative width of the pontoon is an important factor influencing the wave transmission coefficient of the floating breakwater. The transmission coefficient decreases obviously as the relative width of the pontoon increases. The horizontal plates help to reduce the wave transmission over the floating breakwater. The motion responses and the mooring forces of the pontoon-plate floating breakwater are less than those of the pontoon floating breakwater. The mooring force at the offshore side is larger than that at the onshore side. 展开更多
关键词 hydrodynamic analysis pontoon-plate floating breakwater transmission coefficient "motion response mooring force
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A Cogwheel WGM Resonator Based on Spoof Surface Plasmon Polaritons
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作者 Peng Li Ming Huang +3 位作者 Jingjing Yang Qiannan Lu Baojing Hu Meixia Yang 《Journal of Computer and Communications》 2020年第12期102-112,共11页
<div style="text-align:justify;"> The optical WGM resonator plays an important role in modern physics due to its ultra-high quality factor and small volume mode. In optics, SPPs modes can effectively c... <div style="text-align:justify;"> The optical WGM resonator plays an important role in modern physics due to its ultra-high quality factor and small volume mode. In optics, SPPs modes can effectively confine electromagnetic waves at the interface between metal and dielectric, providing extremely high sensitivity. New interesting WGM phenomena will emerge when the WGM is combined with the SPPs. In this paper, a cogwheel resonator based on spoof SPPs was designed, which can generate multi-order WGM modes. The transmission coefficients, dispersion relations and resonance modes of the WGM resonator were analyzed. The proposed resonator extends the WGM mode from optical band to microwave band, providing a new perspective for the applications of WGM mode at microwave band. </div> 展开更多
关键词 Whispering Gallery Mode Spoof Surface Plasmon Polaritons Transmission response Dispersion Relation
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Influence of the prestressed layer on spherical transducer in sound radiation performance 被引量:1
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作者 Xiaofang Zhang Xiujuan Lin +6 位作者 Rui Guo Changhong Yang Hui Zhao Mingyu Zhang Yan Wang Xin Cheng Shifeng Huang 《Journal of Advanced Dielectrics》 2022年第6期32-39,共8页
To improve the acoustic radiation performance of the spherical transducer,a prestressed layer is formed in the transducer through fiber winding.The influence of the prestressed layer on the transducer is studied from ... To improve the acoustic radiation performance of the spherical transducer,a prestressed layer is formed in the transducer through fiber winding.The influence of the prestressed layer on the transducer is studied from the effects of the radial prestress(Tr)and acoustic impedance,respectively.First,a theoretical estimation of Tr is established with a thin shell approximation of the prestressed layer.Then,the acoustic impedance is measured to evaluate the efficiency of sound energy transmission within the prestressed layer.Further,the ideal effects of Tr on the sound radiation performances of the transducer are analyzed through finite element analysis(FEA).Finally,four spherical transducers are fabricated and tested to investigate their dependence of actual properties on the prestressed layer.The results show that with the growth of Tr,the acoustic impedance of the prestressed layer grows,mitigating the enormous impedance mismatch between the piezoelectric ceramic and water,while increasing attenuation of the acoustic energy,resulting in a peak value of the maximum transmitting voltage response(TVRmax)at 1.18 MPa.The maximum drive voltage increases with Tr,leading to a steady growth of the maximum transmitting sound level(SLmax),with a noticeable ascend of 3.9 dB at a 3.44 MPa Tr.This is a strong credibility that the prestressed layer could improve the sound radiation perfor­mance of the spherical transducer. 展开更多
关键词 Radial prestress acoustic impedance spherical transducers transmission voltage response transmission sound level
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