伺服机构动态特性测试系统设计

Design of Dynamic Characteristic Test System for Servo System

摘要:

动态测试是导弹伺服机构的一项重要测试，测试结果能够从本质上反映出系统性能的真实状态。针对传统电液伺服机构动态测试存在测试装备体积大、测试时间长等不足，本文设计完成了一种新型导弹伺服机构动态测试系统。通过对比分析电液伺服机构现有的正弦相关分析法、谱分析法、基于多谐差相信号测试方法和基于chirp信号测试方法的测试原理和优缺点，优选出重复性好且能够对伺服机构频带充分覆盖的chirp信号作为测试激励，显著缩短了伺服机构测试时间，充分激励出被测对象模态，完成导弹伺服机构的动态性能测试任务。伺服机构动态测试系统设计采用PCI总线技术和虚拟仪器技术，基于研华IPC-610L工控机和PCI-1706U多功能数据采集卡搭建测试平台；选择面向对象的C#语言编程设计友好的人机交互界面，实现数据采集控制、数据处理和数据库管理功能。

Abstract:

Dynamic test is an important test for missile servo mechanism and reflects the performance status in essence. Aiming at the shortcomings of traditional electro-hydraulic servo mechanism dynamic test, such as large volume and long test time, a new dynamic test system for one missile servo mechanism was designed. By comparing and analyzing the existing test method for electro-hydraulic servo mechanism, namely sinusoidal correlation analysis method, spectrum analysis method, multi-harmonic phase signal test method and chirp signal test method, the chirp signal with good repeatability and sufficient coverage of the servo frequency band was selected as test excitation for one missile servo mechanism, which could significantly shorten test time, fully stimulate modal state, and complete dynamic performance test. The dynamic test system based on PCI bus and virtual instrument technology, was completed by using the IPC-610L computer and PCI-1706U multi-function data acquisition card, and the computer interface was designed by C# programming to realize data acquisition control, data process and data management functions.