Study On Semi-active Control Algorithm And Design Of Semi-active Control Dva Test Platform

In this thesis,the strategies of semi-active on-off control are studied and a corresponding DVA test-platform is designed.Koo proposed a couple of on-off semi-active control strategies.We apply two of those strategies on the models of Voigt DVA and Ground-hook control DVA,researching its effect on reducing the vibration of main system.The responses of main system under displacement excitation are also studied and made a comparison with the force excitation system.Last an object of semi-active control DVA text-platform is designed,in which we make a calculation about weight blocks and spring stiffness.The thesis mainly disposes the following issues:Firstly,two semi-active control strategies proposed by Koo are applied on the models of Voigt DVA and Ground-hook control DVA.The approximately analytical solutions of those models are got through the averaging method.The numerical solutions of the main systems are also solved numerically.The approximately analytical solutions are compared with the numerical solutions to determine the accuracy of the results.The influences of key parameters on the semi-active control systems are found out.The results of those two semi-active control strategies are compared with other DVA systems,concluding that the semi-active control strategies of DBG has the best performance,in both semi-active control models.Secondly,the influence of displacement excitation on main system of Voigt DVA and Ground-hook control DVA are studied.These results are compared with the force excitation systems'.The comparison shows that in the model of Voigt DVA,both the responses of main system under force excitation and displacement excitation,are extremely corresponding.While in the model of Ground-hook control DVA,the response of force excitation is better than the displacement excitation.It is supposed that the damper linking the ground had a bad influence on the main system response.Thirdly,a semi-active control DVA test-platform is designed,also with its weight blocks and spring stiffnesses.The group of blocks are designed as each level increasing 10 kg and ranging from 30 kg to 320 kg,totally 30 ranges.The springs of the test-platform main system were 3 groups and the subsystem were 4 groups.At last,a 2D structure sketch of the semi-active control DVA test-platform is given out.