| 英文摘要 |
This paper presents the numerical simulation and experimental verification of a semi-active cable vibration control system. The finite-element analysis “ABAQUS” was used to design and simulate the dynamic characteristics of a cable structure. The system matrixes ‘M’, ‘C’ and ‘K’ of the simplified cable model were generated from the finite element model. A 3 kN MR damper manufactured by Lord Co. was connected to the cable to reduce its vibration. Through a systematic performance test and system identification procedure, the modified Bou-Wen model was generated to represent the nonlinear behavior of the MR damper. Based from the simplified cable model and MR damper model, the LQG with continuously-optimal control was used to design the semi-active control system. The scaled-down cable structure has been designed and built according to the finite-element model of ABAQUS. Suitable mass and cable force were added to make the cable vibration more realistic. A small shaker has been designed and mounted onto the cable to generate the excitations with different amplitudes and frequencies. Both passive and semi-active control cases have been tested. Through the numerical simulation and experimental test results, the semi-active cable vibration control system with MR damper can reduce well the cable vibration under different kinds of excitations. This investigation demonstrates the feasibility and capabilities of a cable vibration control system with MR damper.. |
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