Φ0.5米高超声速风洞连续变攻角测力试验数据处理方法研究

Research on the data processing method of continuous variable angle of attack force test inΦ0.5 meter hypersonic wind tunnel

摘要:

Φ0.5米高超声速风洞连续变攻角测力试验具有数据量大和试验效率高的优点，但受传感器响应不一致、模型自重及加减速过程的影响，无法对试验数据直接进行处理，需要对试验数据进行修正，主要开展了以下工作：首先通过测试确定了模型攻角控制系统运行参数、数采系统参数和软件采集策略；然后使用无延时数字滤波器对试验数据进行降噪处理，并应用互相关函数计算天平各分量相对攻角信号的延时，基于常规测力试验数据处理流程，系统提出了天平支杆弹性角、模型自重、模型离心力及惯性力的修正方法；最后开展了对比验证试验及天平温度效应试验，结果表明连续变攻角试验结果与常规阶梯试验结果吻合较好，连续变攻角试验技术可有效降低高马赫数条件下的温度效应。

Abstract:

The continuous variable angle of attack force test in Φ0.5 meter hypersonic wind tunnel has large amount of data and high efficiency advantages. But affected by sensor response time differences, model self weight and model’s accelerate or decelerate, but the test data could not be processed without preprocess. The following work is mainly carried out: First, parameters of the model attack angle control system and the data acquisition system, and the software acquisition strategy are determined by testing. Then, the non delay digital filter is used to preprocess the experiment data, and the cross-correlation function is used to calculate the time delay of each component of the load balance relative to the angle of attack. Based on the regular force test data processing flow, And the correction methods of elastic angle, model self-weight, model centrifugal force and inertia force are put forward systematically. Finally, comparative verification test and balance temperature effect test was were carried out, it showed that the results of the continuous variable angle of attack test were in good agreement with the results of the conventional step test, the temperature effect at high Mach number could be reduced effectively by continuous variable angle of attack force test technical.