A Test System for Testing the Fatigue Performance of Helicopter Main Propeller Girder

Abstract

A test system for testing the fatigue performance of the helicopter main propeller girder, which consists of a helicopter main propeller girder root specimen, a process joint, a loading joint, a test bench, a vibration exciter, a motor, an electric control cabinet, a hydraulic system, a hydraulic control cabinet, a strain One end of the helicopter main propeller girder specimen is installed on the process joint; the process joint is installed on the test bench; the other end of the helicopter main propeller girder specimen is installed on the loading joint; It is connected with the loading joint and installed on the test bench; the motor is connected with the exciter and the electric control cabinet; the hydraulic system is connected with the loading joint and the hydraulic control cabinet; the strain gauge is pasted on the corresponding position of the helicopter main rotor girder test piece; the dynamic strain The instrument is connected with the strain gauge; the optical oscilloscope is connected with the dynamic strain gauge. The invention has simple structure and convenient operation, and is used for the fatigue performance test of the main propeller girder of the helicopter, and the test result has important engineering application value for the evaluation of the fatigue life of the structure.

Description

technical field [0001] The invention relates to a test system for testing the fatigue performance of a main propeller girder of a helicopter, and belongs to the technical field of test and test. Background technique [0002] Engineering structures are subjected to alternating loads during use, and fatigue damage may occur. In order to ensure its safety, it is necessary to test its fatigue performance. After years of technological development, a complete fatigue performance test standard has been formed; however, the helicopter main propeller In the actual working process, the load is complex. The high-speed rotation of the main rotor of the helicopter will generate a large centrifugal force, which will generate a large axial tension at the root of the blade. At the same time, the aerodynamic load of the helicopter will generate alternating bending moments at the root of the blade. , therefore, it is necessary to simulate the complex loading conditions of the main propeller g...

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Problems solved by technology

[0002] Engineering structures are subjected to alternating loads during use, and fatigue damage may occur. In order to ensure its safety, it is necessary to test its fatigue performance. After years of technological development, a complete fatigue performance test standard has been formed; however, the helicopter main propeller In the actual working process, the load is complex. The high-speed rotation of the main rotor of the helicopter will generate a large centrifugal force, which will generate a large axial tension at the root of the blade. At the same time, the aerodynamic load of the helicopter will generate alternating bending moments at the root of the blade. , therefore, it is necessary to simulate the complex loading conditions of the main propeller girder of the helicopter, test its fatigue performance, and use it to evaluate the fatigue life; There is no effective fatigue performance test system for the main propeller girder of the helicopter with the axial tension generated by the centrifugal force and the alternating bending moment due to the flapping and shimmy motions.

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