缩比模型飞行试验相似准则研究

针对全尺寸飞机直接进行飞行试验存在风险大、成本高的问题,利用缩比模型进行相关试验.在风洞试验相似准则的基础上,从飞机的六自由度运动方程入手,利用相似定理研究缩比模型飞行试验遵循的运动相似准则和飞行控制系统相似准则.以某型固定翼飞机为例,对缩比模型与全尺寸飞机进行开环和闭环六自由度仿真,并验证所推导的相似准则.结果表明,试验结果能准确反映原机的稳定和控制特性.

Research on Similarity Criterion of Sub-scale Model Flight Test

To solve the problem of high risk and high cost in direct flight test of full-size aircraft, the sub-scale model is used to carry out relevant tests. Based on the similarity criterion of wind tunnel test and the 6 degrees of freedom motion equation of aircraft, the similarity theorem is used to study the similarity criterion of motion and the similarity criterion of flight control system for the sub-scale model flight test. Taking a fixed-wing aircraft as an example, the open loop and closed loop 6-DOF simulation of the sub-scale model and the full-size aircraft are carried out, and the similarity criteria derived are verified. The results show that the stability and control characteristics of the original aircraft can be accurately reflected by the test results.