| The electrorheological(ER)damper designed and manufactured by using electrorheological fluid has many advantages such as convenient regulation,active control and rapid response.It has been widely reported and applied in engineering field.The existing ER dampers use external boost circuit to provide high-value electric field,which is not only complex in structure,but also easy to introduce electromagnetic interference.Therefore,a photo-controlled ER damper is proposed based on the abnormal photovoltaic effect of PLZT ceramics excited by ultraviolet light source.Compared with the traditional ER damper,the new ER damper which used PLZT ceramic as the power supply is suitable for remote non-contact operation in independent working environment such as clean space or vacuum.It has the advantages of driving clean,wireless energy transmission,light control and no electromagnetic interference.The utility model provides a novel light control damping method for the current variable ER damper device,and has certain engineering research value.On the basis of summarizing the photovoltaic mechanism of PLZT ceramics under multi-physical field coupling,a simplified expression of the static voltage of PLZT ceramics without load is proposed;the equivalent electrical model of PLZT ceramics is modified to obtain the expression of the driving voltage of PLZT ceramics with external load;Theoretical analysis and experimental verification are carried out on the related factors of driving voltage,such as light intensity,distance between copper foil plates and length of copper foil plates.The hydrodynamic model of ER fluids in circular damping channel is established,and the relationship equation between pressure difference at both ends of damping channel and driving voltage of PLZT is deduced.The related parameters in the relationship equation are identified.The influence of the distance between the copper foil plates,the length of the copper foil plates and the light intensity on the pressure difference between the two ends of the damping channel is simulated and analyzed by using MATLAB software.The fluid dynamics simulation of ER fluids in circular damping channel is carried out in fluid simulation software Fluent.The simulation results are basically consistent with the theoretical calculation results,which proves the correctness of the photo-controlled electrorheological fluid model in the circular channel.Based on the expression of driving voltage in the illumination and shutdown phases of PLZT ceramics and the bang-bang control strategy,the corresponding closed-loop control model is established,and the active closed-loop control simulation analysis of the proposed photo-controlled ER damper is carried out in MATLAB software.The simulation results prove the effectiveness of the bang-bang control strategy.The experimental platform of the photo-controlled ER damper was built,and the experiment of the influence of light intensity on the pressure difference between the two ends of the damping channel was carried out,which verified the feasibility of the PLZT ceramics-driven ER damper.Based on the analysis of the experimental results,a method to further optimize the experimental results is proposed. |
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