机载翼面压力分布测试系统校准技术研究

Research on Calibration Technology of Airborne Airfoil Pressure Distribution Test System

摘要:

基于压力分布测试的飞行载荷试飞对飞机的气动设计验证及结构强度考核具有重要意义,某型机采用以压力扫描阀为核心的飞行测压模块开展压力分布测量,其测试的准确程度直接影响到科目试飞结果。针对载荷试飞科目精度需求,开展基于飞行测压模块原理的系统校准技术研究,提出了一种多通道的校准方法。经过地面校准实验表明,飞行测压模块的测试精度优于0.05%,不确定度为0.00039 psi(k=1.96)。经飞行试验验证,校准后的飞行测压模块工作稳定,为某型机结构部件表面压力分布测试,提供了准确的测试数据。

Abstract:

Flight load test based on pressure distribution test is of great significance for aircraft aerodynamic design verification and structural strength assessment, the accuracy of the flight pressure module test directly affects the test results of the subject, according to the demand of flight test, research on the calibration of test system was carried out based on the principle of pressure module, and a multi-channel calibration method was proposed. Ground calibration experiments show that the flight test module"s test accuracy is better than 0.05%, and the uncertainty is 0.00039 psi (k=1.96). It has been verified by flight test that the calibrated flight pressure measuring module works stably and provides accurate test data for the surface pressure distribution test of a certain structural part.