演講公告
新聞標題： ( 2012-04-05 )
演講主題： Active Control of Structural Vibration and Acoustic Radiation Via
主講人：吳天堯教授(中央大學 數據分析方法研究中心)
演講日期：2012年4月10日(星期二) 下午2:00 –3:00
演講地點：(光復校區) 科學一館223室
茶會時間：當天下午1:30 (科學一館205室)
摘要內容：
The goal of this research is to investigate the feasibility of utilizing the left and right eigenvector assignment concept for active control of structural vibration and acoustic radiation. The right eigenvector assignment approach is directly related to mode shape tailoring. It therefore can be utilized to achieve
structural vibration confinement and acoustic radiation reduction. The control strategy of vibration confinement is to alter the right eigenvectors through active action, such that the modal components corresponding to the concerned region
have relatively small amplitude. Similarly, the control strategy for reducing acoustic radiation is to alter the right eigenvectors through active action so that the modal velocity distributions cause as small radiation as possible.
Reciprocally, the concept of left eigenvector assignment is to alter the left eigenvectors so that the effects of the exogenous disturbances on the system responses can be modified. Therefore the left eigenvector assignment can be
conceptually used to reduce the effects of external excitations, and thus achieve disturbance rejection. The design goal is to alter the left eigenvectors through active action such that the forcing vectors are as closely orthogonal to the left
eigenvectors as possible. Because of these clear physical meanings, the proposed left-right eigenvector assignment concept can target the nature of the structural vibration-acoustics problem with more physical insight as compared to many more classical control schemes. With such an approach, one can achieve both disturbance rejection and modal confinement (vibration control purpose) or modal radiation reduction (noise reduction purpose) concurrently for forced vibration-acoustics problems.
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