The Research Of Semi-active Hydraulic Damper Based On Piezoelectirc Energy Harvesting

Piezoelectric driver with its large output force, fast response, no electromagneticinterference, low energy consumption, easy to control and other advantages has beenwidely used in aerospace/machining/vehicle/construction and other fields. Inrecent years, with the in-depth research to the piezoelectric material, a lots of newtheory and technology based on piezoelectric materials were further developed andextensively applied. After carefully analyzed and summarized the applicationtechnology of piezoelectric material at home and abroad, a new vibration controlsystem, namely semi-active hydraulic damper based on energy harvesting (SAHD)was presented. Using the properties of piezoelectric materials, the SAHD can convertthe mechanical vibration energy into electrical energy and store it in a cap. Thoseenergy will be used to drive a hydraulic damping valve to regulate the systemdamping with the aim of reduce vibration.To be specific, the paper’s main contents are as follows:1、the research background, characteristics, application areas of SAHD wereintroduced firstly in this paper. Then the technology such as the piezoelectric powergeneration technologies, piezoelectric drive and control technology that related to thispaper’s research at home and abroad was included and analyzed.2、Basing on the engineering fluid dynamics theory and piezoelectric theory, theprinciple and component of SAHD was presented. A cone valve was selected as thedamping force generator to control the fluid damping and its physical andmathematical model which contain parameters such as damping force, the spooldisplacement, the valve port flow area, pressure, other parameters was established.The piezoelectric stack can output large forces but small displacement, so anamplification mechanism based on hydraulic theory was designed to gain enoughdisplacement to drive the cone valve, and also a physical and mathematical model wasestablished to describe the relationship of its parameter such as output displacement,drive voltage, length and area of piezoelectric stack and the size of the amplificationmechanism. Finally, a whole model of SAHD that be used to eliminate the vibrationof a car between engine and its body was established.3、Basing on the theory model of part two, a Simulation model that is used to testthe vibration eliminate effect of semi-active hydraulic damper was established in AMESim interface and also a lots of structural parameters was designed. In order toput the control algorithm in the simulation model into use, a electronic control systemthat based on TMS320F2812Digital Signal Processor was designed and its code wasalso be generate automatically by using the software matlab/simulink and CCS.4、According to structure of SAHD using piezoelectric chip,a piezoelectricgenerator consisted of multi-vibrators that has wide frequency bands was presented.The output performance of the piezoelectric generator, with it’s vibrators connected indifferent methods (direct serial/parallel-connection, Serial/parallel-connection withrectifiers), was studied theoretically and experimentally.5、The power extraction and storage unit based on synchronized switch energyharvesting theory was designed. A mathematical model that contain the circuitparameters which have influence on the output of energy was established theoretically.Lastly a energy collect circuit based on the singlechip—MSP430F1101A wasdesigned and used in the energy collect experiment.