针对动梁式龙门双驱系统产生不同步误差的原因及机理进行了建模研究,提出了一种双驱动同步控制模型.其特色在于模型基于动力学理论分析,描述了双驱动两轴机械耦合特性及两轴摩擦力特性对于不同步误差的影响.为对所建模型进行验证,以动梁式龙门铣床DK-1200为例,测量机床匀速及S型加减速运动下的两轴不同步误差,并与Matlab/Simulink的模型仿真结果进行对比.结果表明,具两轴摩擦特性及机械耦合特性的双驱同步控制模型仿真结果与实测结果的相关系数达0.861 8,所建模型能够有效反映动梁式龙门机床双驱同步结构的运行状况,两轴机械耦合及摩擦力不同是解决双驱动不同步问题不可忽略的因素.%A synchronous control system model is proposed to study the reasons and mechanism that cause the non-synchronous errors in dual-driving systems on gantry-type tools with traveling bridge. The proposed dual-driving model is based on dynamics theory analysis, from which the effects of mechanical cross coupling and different frictional characteristics on non-synchronous errors can be described. Experiments are carried out on the DK-1200 machine tools to verify the proposed model. Non-synchronous errors are measured and compared with Matlab/Simulink simulation results when machine tool moves at a uniform velocity and S accelerate/decelerate curve. The results show that the coefficient of correlation between simulated and practical experimental results for the model with mechanical coupling and friction reaches up to 0. 861 8. The model can reflect the state of motion of the machine tools well, and the friction difference and mechanical coupling are un-ignorable factors in solving the problem of non-synchronous errors.
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