Study On Dynamics Performance Of Linear Feed System With MR Damping

At present, with the development of the precision machine tools and other precision manufacturing equipments both at home and abroad, the most commonly used precision feed drives are the ball screw drive and the linear motor drive. Compared with the ball screw, the linear feed system driven by a linear motor has the merits of high feeding speed, high acceleration, long stroke, fast dynamic response and etc. However, the lack of necessary damping links of system, leads to the small damping, poor anti-disturbance capacity, easy bringing ultraharmonic oscillation, and limits the further improvement of the stability.To overcome the demerits of linear feed system, such as acceleration wave, low damping, poor anti-disturbance capacity and etc. This paper investigates dynamics performance of the high-speed high-precision linear feed drive with MR damping. MR damper with shear work mode is adopted and modeled with modified of Bingham model according to the required damping force of feed system, the equivalent linear damping coefficient of MR damper is calculated based on energy dissipation method. The P-PI Control strategy is built up based on the MR damping control with speed feedback and acceleration feedforward control strategy. The dynamics, steady-state error, bandwidth and servo stiffness of the feed drive with MR damping are investigated with MATLAB simulation to identify changes and impacts of performance to optimize the control parameters.The virtual prototyping technology researches are developed to investigate the dynamics of the feed drive. Firstly,the linear feed unit is modeled with Solidworks entity, then the combined mechatronic simulation is studied with MATLAB and ADAMS, the thrust, acceleration, velocity and displacement curve of linear feed system with different control parmeters are simulated.The experiments of the feed drive with no MR damping are conducted, the results verify that correctness and reliability of the virtual prototyping simulation. At the end of the paper, the dynamics of linear feed drives with MR damping are modeled and analyzed. Compared with feed drive with no MR damping, it has faster orientation time, more stable velocity and greater acceleration. The virtual prototyping technology is developed to promote the research of the high-speed high-precision linear feed system with MR damping.