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Technical note：Large amplitude free vibration of a flexible panel coupled with a leaking cavity

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2017年第1期18卷 75-82页

作者： Yiu-yin LEE Department of Architecture and Civil Engineering City University of Hong Kong Kowloon Tong Kowloon Hong Kong China

This paper addresses the effect of leakage on the natural frequencies of a large amplitude vibrating panel backed by a cavity, which has not been considered in many other related studies. The structural-acoustic governing equations are employed to study this nonlinear problem. An elliptical integral method, which was recently developed for the nonlinear panel cavity problem, is introduced here to solve for the structural-acoustics responses. The present results agree reasonably well with those obtained from the classical harmonic balance method. Modal convergences of the nonlinear solutions are performed to verify the proposed method. The effects of vibration amplitude and leakage size are studied and discussed. It is found that （1） the edge leakages in a panel cavity system significantly affect the natural frequency properties, and （2） the edge leakages induce a low frequency acoustic resonance.

关键词： Large amplitude vibration Elliptic integral method noise and vibration

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第二次世界大戦后日本にぉける転がリ轴受の技术史

机械技术史

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机械技术史 1998年 658-663页

作者：角田和雄中央大学理工学部

The paper made clear the reasons why the acceptance of Japanese bearings to the world market after World WarⅡ.The reasons were the formation of production principles in Japanese manufacturers which depended deeply on Japanese people’s national mentality came from their traditional sensitivity and perfectibility for *** production principles were to make low noise and vibration bearings,and long durability *** paper deals with the processes of technological progress of the bearings according to the principles and production technology.

关键词： rolling bearing history of technology production principle national mentality noise and vibration

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Understanding the noise Sources in a C-EPAS and Its Mitigation

Understanding the Noise Sources in a C-EPAS and Its Mitigati...

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2014中国汽车工程学会年会

作者： Sista Subrahmanyam Mala D M Ravi Yellajosula Tech Mahindra（Shanghai） Corporation Ltd

The design of a low-cost Electric Power Assist Steering for the modern cars,including the HEVs and the EVs,presents a lot of *** the sources of noise,vibration and its effects will help designers to use the right control techniques for the EPAS motor *** designers are assisted to understand such sources of noise and fulfil some necessary corrections to minimize the noise.A typical EPAS system which adopts simple technique to identify and minimize such noise is *** also helps designer to link between various domains such as the mechanical field to magnetic field to electric field,which provides a clear understandings of what is creating what effect and discusses methods of minimizing the acoustic foot print The probable source of the audible noise emanating from the EPS column is when the system is maneuvered at a higher column *** system assembly need to be tested for variety of combinations to pin point the exact component responsible for noise and vibration at different speed（RPM） and torques（Nm）.Approach adopted is to correlate noise（Audio） and vibration data with the Phase Current in the Frequency Domain（FFT） to reduce the analysis overheads on tools and expensive analysis *** authors have a vast experience in the above subject and have used this simplified technique to practically solve a number of NVH,relating to C-EPAS,for low cost automotive segment

关键词： electric power steering noise and vibration torque sensor resolver RDC rack and pinion electronic control unit permanent magnet synchronous motor magnetic saturation torque ripple reduction.

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