Study On Design And Control Strategy Of Boom Active Vibration System

In recent years,boom structure has got fast development because of it high work efficiency, simplicity of operator and good security. Modern boom are built to be in light weight of construction to increase their maximum operation velocities, maximum length, and outreach. Hence, the truss structure of the boom set provides a limited stiffness and is subject to bending oscillations in the various modes. Meanwhile, on account of boom load changing, coupling problem of ladder knuckle and external interference, the design of vibration absorption is not as ideal as expected. From the above, to damp these oscillations using its luffing hydraulic drives an active control is proposed in this paper. Active structural acoustic control always is the kind of questions boom vibration field focused on. In this paper, based on independent modal space control method and multibody system dynamics, studying on active control of boom vibration of aerial platform vehicle in vertical position was carried out. The research contents are as follows:Firstly, the composition and principles of aerial platform vehicle boom vibration system was introduced and the system vibration reduction targets was given according to the structural modes and transient dynamic characteristics, and a boom vibration control system was developed based on them.Secondly, the overall scheme of the hydraulic drive system was given. A hydraulic system char was drew. Selection and design were done to the multiple unit valves and counterbalance valve in order to make hydraulic system running stability. Simultaneously, the selection of the hydraulic supply and hydraulic actuators was described.Finally, a mathematical model of the valve controlled cylinder flexible-boom position servo system was presented and simplified with the boundary condition of boom vibration system and modal filter. By reviewing the actual engineering data, the vibration control algorithm of boom system was mainly studied. Based on the modal space and eigenstucture assignment control algorithms were applied to the single system. Compared with the controller based on the traditional PID control algorithm, the control strategy proposed in this paper could reduce the vibration and improve the stability of the system while the PID controller cannot control the vibration of all operating conditions. Based on the simulation results, compile the modal space and eigenstucture assignment control algorithms on the codesys platform, and transplant the control algorithm to the EPEC controller and do joint debugging.