基于硬件在回路的数控系统机械分析器设计

The Design of Mechanical Analyzer Used for CNC System Based on Hardware-In-The-Loop Simulation

机械振动一直是影响数控系统高精度加工的重要因素,避免系统工作在共振频率附近可极大提高加工精度。而机械分析器的主要用途就是测定数控系统的共振频率,以便对数控系统进行在线调整达到最好的加工性能。文章介绍了采用外加激励并采集反馈进行对比的方式对数控系统共振频率进行测定,并设计了带有实物模型接入的闭环回路结构,结合Scilab建模仿真过程,快速搭建了机械分析器的系统模型。系统模型具有很好的实用性、开放性和可移植性。最后通过实验验证了系统的实时性,并成功对数控系统的共振频率进行了的测定。

Mechanical Vibration has been an imp ortant factor in the high-precision machining of the CNC system, to avoid the system working in the vicinity of resonance frequency can greatly improve the machining accuracy. And the main purpose of Mechanical Analyzer is to determine the resonance frequency of CNC system, in order to do online adjustments to CNC system to achieve the best processing performance. This paper introduces the way of comparing the added external incentives and collected feedback to determine the resonant frequency of the CNC system, designs a closed-loop structure with Physical model, combines the process of modeling and simulation with Scilab, and gives a rapid way to build the system model of the mechanical analyzer. The system model has good practicality, openness and portability. Finally, an experiment verifies that the platform can satisfy real-time requirement and the resonant frequency of CNC system is measured successfully.