Rotor pneumatic load analysis method based on actually measured structural load

Abstract

The invention discloses a rotor pneumatic load analysis method based on actually measured structural load, and belongs to the technical field of flight tests. The invention discloses a helicopter rotor working method. Measurement of the key structure load of the helicopter rotor is determined. The method comprises the following steps of carrying out resistance strain gauge installation and groundload calibration test on the strain gauge; testing and adding a key signal of rotor wing rotation; through flight tests in different states, carrying out statistical analysis on the actually measuredrotor structure load in the time domain and the frequency domain without focus on a plurality of assumptions in the helicopter theoretical model simulation process, Meanwhile, different from the aerodynamic environment simulation conditions such as pneumatic test and rotor tower test processes, the aerodynamic condition of the helicopter rotor can be reflected more truly, and a more reliable helicopter rotor aerodynamic analysis rule is obtained.

Description

technical field [0001] The invention discloses a rotor aerodynamic load analysis method based on measured structural loads and belongs to the technical field of flight tests. Background technique [0002] The helicopter rotor is not only the aerodynamic lifting surface during the flight of the helicopter, but also the control surface. It is of great significance to accurately grasp the change law of the aerodynamic load of the helicopter rotor, whether it is in the performance evaluation of the helicopter, or in the trim calculation and flight quality evaluation of the whole machine. In the actual flight test process, the aerodynamic load distribution of the rotor is also different for different flight test subjects in the helicopter flight spectrum. The rotor as the main vibration source of the helicopter will also reflect different vibration levels of the whole helicopter. Considering from the angle of view, it is more important to understand the distribution law of helic...

AI Technical Summary

Problems solved by technology

[0003] At present, the analysis technology of helicopter rotor aerodynamic load at home and abroad mostly stays in theoretical model calculation or wind tunnel test, rotor tower and other environmental conditions, and there is little experience in the analysis technology of rotor aerodynamic load in the actual flight test process

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