Research On The Active Vibration Control Of Body’s Structure Based On Sliding Mode Control

Active vibration control technology and method based on piezoelectric smart structureis a comprehensive frontier discipline combined with materials science, modern controltheory, mechanics, finite element analysis and experimental analysis. Vibration noise andNVH are two important index to evaluate the performance of a vehicle, however, the twopoints are contradictory. Pursing of NVH may reduce vehicle stiffness to generate vibrationnoise and destroy the riding comfort. Piezoelectric material has piezoelectric effect and thequality is small so that it can control vibration for large structure which provide a new wayto control vibration.In this paper, based on the national natural fund project and piezoelectric smartstructure theory, we researched on vibration control of rectangular thin plate and vehicle roof.We did simulation analysis and experimental analysis.The first chapter in this paper, we mainly introduced the development of smart structureand the research status of active vibration control, compared and explained many controlalgorithm to the significance and feasibility of my research. Furthermore in this paper weintroduced piezoelectric material properties. The second chapter in this paper, we researchedon sliding mode control including the development, switching condition and its applications.The third chapter in this paper was mainly about the optimal placement of piezoelectricpatches and the derivation of the state space equation of the piezoelectric laminated plate.Using D optimization algorithm, based on modal analysis, we could calculate the largestmodal strain of the sum of each order modal strain and where was the place to paste thepiezoelectric patches. And then applying different forms of stimulation such as sinusoidalsignal, step signal，white noise signal to prove the validity of the optimal location. Inaddition, deducing the state-space equation of four edges clamped rectangular thin plate toprepare for the next simulation. The fourth chapter was mainly about the simulation ofrectangular plate using sliding mode control algorithm. Firstly designed sliding modecontroller and state observer and then used Matlab/Simulink to write a program flowchart tosimulate and analysis. Chapter five was about experimental verification on rectangular thinplate and roof. In this paper we introduced the experimental platform, used PCI-6229tocollect and export data. In the experiment, producer-consumer cycle was used to process data and used sliding mode control algorithm to control vibration. At last we made aconclusion for the research result and discussed the research’s coming.The research showed that active control method based on sliding mode control couldreduce the vibration of body structure.