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针对液体姿轨控火箭发动机地面试验高精度、高风险和灵活多变的特点,设计研发了一套以PXI(PCI extensions for instrumentation)控制器为主体的发动机试验测控系统.控制系统拥有40路开关量控制能力,综合运用手动、时序和自动控制方式.测量系统拥有120路信号同步采集能力,具备故障诊断功能.测控系统软件使用LabVIEW开发,通用性良好.为增强控制可靠性,设计了面向工艺流程的试验面板,应用嵌入式控制,进行信号多级监测并引入紧急自动关机控制.为提高测量精度,对测量参数进行原位标定,提出了一种改进的干扰消除电路.该系统已多次成功应用于液体姿轨控火箭发动机地面试验,采用的设计方法有效地提高了测控系统的可靠性,测量精度和控制精度分别达到0.5%和0.1ms,能够充分满足多种类型的液体姿轨控火箭发动机对试验测控系统的要求.
Aiming at the high precision, high risk and flexible test of liquid attitude orbit rocket engine ground test, a set of engine test and control system based on PXI (PCI extensions for instrumentation) controller is designed and developed.The control system has 40 switches The amount of control capabilities, the integrated use of manual, timing and automatic control. Measurement system has 120 simultaneous signal acquisition capabilities, with fault diagnosis. Monitoring and control system software developed using LabVIEW, good versatility. To enhance the control of reliability, designed for the process Process test panel, the application of embedded control, multi-level signal monitoring and the introduction of emergency automatic shutdown control.In order to improve the measurement accuracy, the measurement parameters in situ calibration, an improved interference cancellation circuit has been proposed. It is successfully applied to the ground test of liquid attitude orbit rocket motor. The design method effectively improves the reliability of the measurement and control system, and the measurement accuracy and control precision reach 0.5% and 0.1 ms respectively. It can fully satisfy many kinds of liquid attitude and track control Rocket engine test and control system requirements.