The Development of a Shaker Controller for Random Vibration Testing

• Main Authors: Yung-Cheng Feng, 馮永正
• Other Authors: Tai-Lang Jong
• Format: Others
• Language: en_US
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/97684792503040739134

碩士 === 國立清華大學 === 電機工程學系 === 94 === A PC-based controller of the eletrodynamic shaker for random vibration test is developed in this thesis. First, the operation characteristics of the shaker and the control approaches are studied. A combined QFT/H∞ design algorithm is employed to design the controller for such highly uncertain dynamic of the shaker. Then the feedback controller is designed and implemented to compensate the known part of the overall test system and to let the shaker maintain fast tracking performance and robustness under extremely uncertain condition. On the other hand, for more complex DUTs, a typical frequency response estimation scheme is first adopted to identify the frequency response shape of the unknown part of the overall test system, and then the resonance and spectral distortion caused by the device under test can be nearly eliminated by manipulating estimated results. A robust, low cost and good quality random vibration test system can be achieved by combining these control schemes properly. The theoretic basis, design procedures and implementation of the controllers are described in detail. Meanwhile, some significant simulation and experimental results are provided to demonstrate the validity of all the designed circuits and performance of the developed controllers.