Test method for testing torsional rigidity of flexible beam

Abstract

The invention provides a test method for testing the torsional rigidity of a flexible beam, wherein two small panels are respectively cushioned on the positions which keep a certain distance with the left part and the right part of a tested profile, an angle gauge is respectively placed on the two small panels to measure the angle, the torsion angle of the left/right profile under each load is directly measured through the angle gauge with the higher precision, so that the relative torsion angle of the tested profile is calculated. The method avoids the larger error caused by the measurement of a laser displacement sensor, and improves the test precision.

Description

technical field [0001] The invention relates to the technical field of helicopter flexible beam tests, in particular to a method for measuring the stiffness of a flexible beam. Background technique [0002] The torsional stiffness of the flexible beam is measured by applying an appropriate amount of torque load to the section of the tested flexible beam and measuring the change in the displacement of the front and rear edges of the section to achieve the test of torsional stiffness. In the prior art, the method usually adopted is as follows: fix the root of the flexible beam on the mounting plate, adjust the rotating mounting plate to ensure that the chord line of the loading section is in a horizontal state; Two laser displacement measurement sensors (the sensors are distributed on both sides of the center line of the flexible beam), the axis of the sensor should be perpendicular to the measured surface of the flexible beam; under the action of the external force couple mom...

AI Technical Summary

Problems solved by technology

[0006] 1. There are errors in the installation of the laser displacement sensor, and it is difficult to ensure that the axis of the sensor is perpendicular to the measured surface of the flexible beam;

[0007] 2. There is a measurement error in the laser displacement sensor. Under the action of the force couple, the flexible beam will be twisted and deformed, which will cause the position of the sensor measurement point to change, so the measured deformation at this time cannot reflect the deformation of

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