车台用角位移传感器自动分度校准系统设计

Design of automatic indexing calibration system for angular displacement sensor used in vehicle platform test

为实现高精度SJJF型数显手动分度头的数控化改造应用,满足某航空发动机整机性能测试中车台用角位移传感器自动校准检测的实用性需求,解决手工角度分度耗时费力的难题,提出了角度量自动分度控制系统设计方案,运用逻辑可编程器件(Programmable Logic Controller,PLC)配合专用梯形图编程指令,实现角度光栅信号自动数字化采集、角度值换算、比例微分积分闭环控制(Proportion Integration Differentiation Controller,PID)定位及光栅对零,能够有效满足车台用角位移传感器线性度、灵敏度等校准精度要求,且节约了70%的时间,提高角度分度效率的同时也降低了劳动强度。

In order to realize numerical control transformation and application of SJJF digital display manual indexing head with highaccuracy, meet practical requirements of automatic calibration and detection of angular displacement sensor used in an aeroengine performance test bench, and solve the time-consuming and labor-intensive problem of manual angle indexing, a design scheme for automatic angle indexing control system is proposed. It uses a programmable logic controller(PLC) in conjunction with a special ladder diagram programming command torealize automatic digital acquisition of angle grating signal, angle value conversion, proportion integration differentiation(PID) control positioning and grating zeroing, which can effectively meet calibration accuracy requirements such as linearity and sensitivity of the angular displacement sensor for platform, save 70% of original manual calibration time, improve angle indexing efficiency and reduce labor intensity.