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Computation Study on Micro-Vibration Hybrid Control for High-Tech Buildings

Author: ZhaoNing
Tutor: LiuHongJun
School: Harbin Institute of Technology
Course: Structural Engineering
Keywords: High-tech platform slight vibration control hybrid control LQG control H_∞Robust control
CLC: TB535.1
Type: Master's thesis
Year: 2008
Downloads: 38
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Abstract


This paper represents the theory and simulation study on hybrid control of high-tech platform according to the project of National Natural Science Foundation of China-"Hybrid control on slight vibration of high-tech platform under the drive of urban orbital traffic" (No. 50578058).The technology of Micro Electro Mechanical System has quickly developed to be a new science and technology area since 1980s. During manufacturing and measuring MEMS devices, a very stable high-tech platform is required. As environmental disturbance needed to be isolated for high-tech platform is complex, not only the vibration of floor that produced by ripple of mother earth, running of machine and vehicle, walk of people should be isolated, but also the vibration produced by airflow of air-condition, sound, motor, which acts on the high-tech platform, should be eliminated quickly. While the rang of vibration frequency which should be taken into account during designing the high-tech platform system is 0~100Hz, the hybrid control combined with passive control and active control should satisfy the requirement of simultaneously isolating high-frequency disturbance and low- frequency disturbance.The paper makes the following investigations:1) This paper firstly designed a high-tech platform which took giant hydraulic actuators as active vibration isolation elements. In this kind of hybrid control, active vibration isolation system thereby abated the low frequency disturbance effectively. Then the characteristics and physical models of air springs as passive vibration isolation elements and giant hydraulic actuators as active vibration isolation elements were all analyzed and discussed.2) Simplified dynamic analytic model of high-tech platform was established. Also taken the dynamic analysis of isolation platform under the combination of the platform and three-floor high-tech plan structure into consideration, the expression and each parameter of dynamic equation were all obtained. Moreover, vibration transmissibility of isolation platform affected by most attentive Z direction during considering isolated effect is calculated and analyzed, which become the theoretical basis to study slight vibration control under the disturbance of complex environment. 3) Design of high-tech platform was simulated by many control algorithms such as LQG control, and Robust control using SIMULINK in MATLAB program. Meanwhile, taken passive isolation system as compared example, the deformation and velocity of isolation platform were analyzed respectively under foundation interference, direct interference and the both interference together. At the same time, three above active controls were also compared and analyzed crossly.According to above research, it can be concluded that the vibration of high-tech platform caused by foundation interference and direct interference of system can be effectively controlled as long as it is an active control, no matter what is adopted, LQG control or robust control.

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CLC: > Industrial Technology > General industrial technology > Acoustic engineering > Vibration, noise and its control > Vibration and noise control and its use > Vibration isolation, damping materials and structures
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