Mechanism Analysis And Experimental Study Of Pulsating Flow Hydraulics Vibration Isolation Device

Nowadays, many kinds of vibration control equipments have been applied inengineering as the development of structural vibration control is matured for more thanhalf a century. With the deeper research of structural vibration control, the focal point ofengineering tends to be simple, cheap, convenient and reliable. While the majority ofcurrent application of vibration isolation is designed to be horizontal vibration, there areseldom for vertical vibrations. It can not be ignored for any building to be threatened bythe vertical vibration. Due to no differences between vibration direction of verticalearthquake and structure support stress direction, together with the big vertical stiffnessof existing isolation device, it has no effect on vertical vibrations.We utilize the unique advantages of hydraulic system widely into some practicalengineering, however, it is far less application in the field of structural vibration controlwhich needs large quantity of support power, damping power and restoring force. Thispaper attempts to present the alternating hydraulic theory into the field of structuralvibration control on the basis of previous achievements. The alternating hydraulicvibration isolation device can be designed by analyzing the characteristics of hydraulicsystem and experimental results. This system, contributing to theoretical analysis andoptimal designs, set up the experimental platform and verified the feasibility of hydraulicvibration isolation.There are four main aspects for research in this paper:(1)It devotes to theoretical analysis and experimental research for alternatinghydraulic system. This system establishes mathematical model; Moreover, it alsoconducts simulation research by the software of AMESim. Lastly, the experimentalplatform of alternating hydraulic system is set up for further experimental research.(2)It designs alternating hydraulic vibration isolation and explores theoreticalanalysis. According to energy transfer and power loss of hydraulic system, the vibrationisolation working principle has been analyzed and compared with typical alternatinghydraulic devices. In addition, fluid damping features and dissipation energy mechanics of throttling valve are all analyzed, and further computes the damping force of throttlevalve-hydraulic cylinder, which laid theory foundation for the experimental design.(3)It presents system simulation and optimal design with the application of geneticalgorithm. The mathematical model of hydraulic vibration isolation system is establishedand it has been simulation analysis by the software of Matlab. It has a further study forisolation effects under the different parameters after optimizing parameters by geneticalgorithm.(4)It designs and builds experimental platform of alternating hydraulic vibrationisolation system. It devices earthquake simulation experiment using state feedback andstate observation and explores the experimental research aiming to the characteristics ofvertical earthquake.