降低发动机试验稳态压力测量不确定度方法研究

Improvement of Steady State Pressure Measurement Method for Engine Test

为降低系统不确定度,分析了试验台稳态压力测量系统的各不确定度来源,对降低稳态压力测量系统不确定度的重要因素进行分析并提出了相应改进方法。采用压力传感器现场校准方法降低测量系统与检定系统差异引入的不确定度,采用三次样条插值法对压力传感器进行温度补偿,降低工作环境温度对压力传感器影响引入的不确定度。经验证,两种改进方法有效降低了系统的不确定度,且在其他型号发动机试验以及相关组合件试验中具有重要的推广和应用价值。

In order to reduce the uncertainty of the system,this paper analyzes the sources of the uncertainty of the steady-state pressure measurement system of the test-bed,analyzes the important factors of reducing the uncertainty of the steady-state pressure measurement system,and proposes the corresponding improvement methods.The in-site calibration method of pressure sensor is used to reduce the uncertainty caused by the difference between the measurement system and the calibration system.The cubic spline interpolation method is used to compensate the temperature of the pressure sensor to reduce the uncertainty caused by the influence of the working environment temperature on the pressure sensor.It is verified that the two improved methods effectively reduce the uncertainty of the system.The improved method has important popularization and application value in other engine tests and related assembly tests.