Shaking Table Test Of The Structural Model Based On Piezoelectric Friction Damper

With the development and progress of smart materials, some researchers havedeveloped a number of smart friction dampers and combined with different controltheory, making smart friction damper greater energy capacity has been played, andachieved good damping control. Based on previous work and the using of piezoelectricceramic material of special physical and mechanical properties, a new type ofpiezoelectric friction damper was designed and experimental study was carried out andanalyzed, after that, applying to the piezoelectric friction dampers’ semi-active controlstrategy was set up, then the shaking table test was carried out about the model structureof power transmission tower installed the new piezoelectric friction damper, when someinnovative research conclusions and recommendations were shaped. The main workwas as follows:(1) The damping mechanism of the theory of passive control, active control theory,control theory and hybrid semi-active control theory was descripted, and the similaritiesand differences between the various control methods were analyzed, then the basicprinciples of physical and mechanical properties of piezoelectric ceramic materials andfriction dampers were introduced. Using its features and consider issues such as reset, anew piezoelectric friction damper was designed, and the works and constructionmethods of the piezoelectric friction damper was analyzed.(2) The mechanical tests of the piezoelectric friction damper was carried out under different number of piezoelectric ceramics, different pre-stress and different inputvoltages. The results show that, the positive pressure of dampers are increased with theincrease of the number of different input voltage piezoelectric ceramics, and therelationship is nearly linear; the changing of preload contribute little effect on damper,the loading-unloading curve of the damper is basic same and similar to the mechanicalproperties of piezoelectric ceramics, indicating a higher efficiency and stableperformance.(3) Starting from the basic principles of fuzzy control, the T-S fuzzy control systemwhich input variable is speed was established for the damper. MATLAB simulationanalysis was done for verifying the validity and accuracy. The results show that theinput variable of the T-S fuzzy control system which input variable is speed is simpleand the control effect is obvious; For normal circumstances, the effect of the control ofthe displacement is more than30%while the effect of the control of the speed is morethan20%.(4) In order to verify the effectiveness of piezoelectric friction damper and thesemi-active control method, the shaking table test of the model structure of powertransmission tower installed the dampers was done and the effective of the control underthe sin and EL-Centro which peak is0.2g,0.4g and0.8g was analyzed. The result showthat the average effect of control of displace in X, Y is19.02%and19.56%and theaverage effect of control of acceleration in X, Y is17.20%and20.26%, implying thatthe performance of the damper and the way of control was effectiveness which could bereferenced in the works.