Application And Study Of Mass Damper Vibration Control For High-flexible Structure

The common characteristics of high-flexible buildings are that it has long fundamental period and the vibration response is mainly controlled with wind excitation. It is effective for mass dampers to reduce the high-flexible structural vibration induced with wind. The wordwide implementation of the mass dampers has been improved rapidely, especially more and more domastic high-flexbile buildings have been and to be equiped with mass dampers, however, there still are some key problems to be researched for the Pass/SATMD/Active mass dampers for applications and for improving the structural comfortability and safety. In order to consider the detailed problems and facilitate the applications of the mass dampers the mass damper theory and application have been studied which support the mass damper design, the main contents are following:(1) Considering the earthquake excitations and based on the relative energy formulars, the system energy control effect and the energy spectrum of TMD control system has been studied. The results show that the main frequency spectrum of load excitations influences the control system energy response and the variation rules of TMD control system energy response is obvious as the TMD parameters changes when the structure frequency is close to the load main frequency.(2) The position-off and On-Off damper position-limited control strategies are proposed to limit the maxium displacement of thd moving mass for TMD. The variation rules of the structural displacement and acceleration response are researched as the position-limited and changeable damper parameter adaptive based on the analysis model of Guangzhou New TV Tower. The results show that the control effect of position-limited On-Off damper is sensitive to the limited space, the control effect of the position-off damper is much better for the structural acceleration reponse, moreover, the movement space for moving mass of TMD can be limited as expected with the less loss of the control effect for the main structural response based on the two control strategies.(3) Considering the vibration control problem for the class of close frequency structures that the several frequencies are dominant of the structural reponse, the semi-tunalbe TMD vibration control method is proposed with the wavelet time-frequency analysis identify technology based the TMD basic principle. The simulating analysis is conducted based on the Shenzhen Wutongshan TV Tower. It shows that it can control the several frequencies of the structure at the same time and gets much better control effect than the classical TMD and it is effective even as the structural stiffness changed range at±15%.(4) For the HMD controller time-delay problm, the six order transcendental proper equation of SDOF-HMD time-delay control system is estabilished. The proper equation is solved and the numerical relationship of structural frequency and damping ration are obtained, moreover, the nonstablity reason is found that the large time-delay will cause the structural high-frequency nonstable. Furthermore, the HMD time-delay compensation control method of fuzzy adaptive adjusting siliding is proposed. Considering the Guangzhou New TV Tower as the analysis model, the method is validated to be effective.(5) The algorithm of optimal time-delay compensation control of HMD control system is proposed which is proved to be robust for the time-delay occurrence with the numerical simulation. The optimal compensation method is proved from the active control test model with the linear motor as the driving device. The results show that the compensation control method is effective and easy to be implemented and the HMD control effect is much bette than TMD under the earthquake excitations.(6) The general design method is proposed for mass damper vibration control of the high-flexible structures. Based on the real structure of Shenzhen Kingkey Finance Center, the AMD vibration control is designed according to the proposed general method with the pole assignment algorithm under the tested across wind load and simulating along fluctuating wind excitation. The results show that it is effective of the AMD to control the structural response under different wind load, furthermore, according the structural space condiction, the AMD control system implement plan is proposed by the new screw assembling driving devices.