Design And Experimental Study On Magnetorheological Hybrid Isolation System

When Underground engineering suffered strong blast loads, there will be a huge destructive power in the structures. As the holding time of blast loads is short, structural movement reached peak nearly in the transient. Resulting in isolation effect of the viscous damping is limited. It has become an important issue in the field that how to reduce acceleration response of underground structures under the explosion impact loading effectively.For actual need in the Underground engineering, according to latest research on magneto-rheological technology, this paper presents a semi-active control isolation system which is suitable for Underground engineering against the strong explosion shock and vibration. The system is combined by the magnetorheological damper and the traditional wire rope isolator in some way. The advantage that the size of the damping force of magnetorheological damper can be control, is well integrated in this semi-active control system. This solves the problem that the traditional passive isolator isolation system can not play the best features of isolation as its damping force size can not be adjustable with the vibration size.With theoretical analysis and experimental verification, this subject researches the dynamic model,the magnetorheological damper dynamics, the realization of its control method and the control system design and implementation of semi-active control shock isolation system under explosion load. Through optimizing the parameters of the damper, a series of shear valve type MR damper vibration isolator adapting to explosion and shock load. And their mechanical models are founded. With the development of MR fluid self-loop equipment, the problem of the long term static setting and settlement are successfully solved. With contradistinction and analysis for control method, a simple and easy-realizing PID control method is determined, and the design and realization of controlling system is described. To test whether the isolation properties of magnetorheological hybrid semi-active control isolation system is better than the traditional passive isolation system, indoor shock test is performed for the developed semi-active control shock isolation system of explosion and impact. The results show that the semi-active control isolation system based on ACMRD isolation which making full use of the damper performance can achieve better control results in smaller control.