摘要: |
发动机高空模拟试验前需要进行推力校准,目的是确定传感器静态特性指标,如线性度、滞后性以及重复性等,关键工作是通过试验的方法来建立输入量和输出量之间的输入-输出实际特性曲线。推力校准中使用的标准传感器有效期为一年,实际使用中传感器存在长期稳定性不佳或突然损坏的现象,但在试验前准备阶段唯一不能确定问题的就是标准传感器,因此,有必要对推力测量进行长期稳定性监测,完善推力校准操作规程,通过研制一套覆盖常用量程的推力传感器比对装置,在推力架或者某个标准传感器长时间没使用时,试验前对标准传感器进行标定,与证书各项指标进行比对,经试验测试实现了对推力传感器的快速校验,时间24min,误差在千分之一内,满足了试验现场对传感器的任务要求。 |
关键词: 推力测量;火箭发动机试验;传感器;推力校准 |
基金项目:某国防科技技术基础项目 |
|
Long Term Stability Monitoring System for Thrust Measurement Sensors Used in Engine Testing Site |
Zheng Ke Guo Jianxin Zhu Wang Wang Dezhi Zhang Xuefei Liu Shuo
|
Beijing Aerospace Test Technology Institute, Beijing 100074
|
Abstract: |
Before the high-altitude simulation test of the engine, thrust calibration is required to determine the static characteristic indicators of the sensor, such as linearity, sensitivity, and repeatability. The key task is to establish the actual input-output characteristic curve between the input and output quantities through experimental methods. The validity period of the standard sensor used in thrust calibration is one year. In actual use, the sensor has long-term poor stability or sudden damage, but the only problem that cannot be determined in the preparation stage before the test is the standard sensor. Therefore, it is necessary to monitor the long-term stability of thrust measurement, improve the thrust calibration operating procedures, and develop a thrust sensor comparison device that covers common ranges, When the thrust frame or a standard sensor is not in use for a long time, the standard sensor is calibrated before the test and compared with various indicators of the certificate. After experimental testing, the rapid calibration of the thrust sensor is achieved, with a time of 24 min and an error of within one thousandth, meeting the task requirements of the sensor on the test site. |
Key words: thrust measurement;rocket engine testing;sensor;thrust calibration |