A dynamic stress test method and test device for a flexible disk

Abstract

The invention provides a dynamic stress testing method of a flexible disk. The dynamic stress testing method of a flexible disk includes the steps: pasting a test foil gauge on an attention part of the flexible disk; machining a lead wire hole, a battery fixing groove, a battery fixing cover plate mounting hole, emitting module fixing holes and a lead wire fixing groove in an engine flywheel; respectively fixing the emitting module and the battery in the emitting module fixing holes and the battery fixing groove; pasting a compensation foil gauge on a battery fixing cover plate; connecting with a speed changer and an engine assembly to enable the test foil gauge lead wire, the compensation foil gauge lead wire and the battery lead wire to penetrate through the lead wire hole from the backend of the flywheel so as to connect with the front end of the flywheel and the emitting module lead wire; connecting each lead wire through a starting motor mounting hole in the engine, and fixing all the redundancy lead wires in the lead wire fixing groove in the flywheel; starting the engine; and receiving the strain signal and analyzing the strain signal, and analyzing the strain signal to obtain the stress curve of the attention part of the flexible disk. The dynamic stress testing method of a flexible disk can accurately test the real stress state under the working state of the flexibledisk.

Description

technical field [0001] The invention relates to a dynamic stress test method and a test device of a flexible disk, in particular to a dynamic stress test method and a test device of a high-speed rotating flexible disk in a sealed cavity of an automobile transmission clutch. Background technique [0002] In the dual-clutch automatic transmission structure, the flexible disc is installed between the engine flywheel and the clutch to reduce the axial, radial and circumferential vibrations and errors caused by the engine's power transmission, and protect the clutch from impact. Therefore, its stress state is a non-proportional multiaxial stress state, and the bearing conditions are complex, and high-cycle rotational bending fatigue fractures are likely to occur at dangerous parts of the flexible disk, such as the root of the nut on the outer edge of the flexible disk. Therefore, it is very important to accurately test the periodic dynamic stress of the concerned parts under the ...

AI Technical Summary

Problems solved by technology

Therefore, it is very important to accurately test the periodic dynamic stress of the concerned parts under the high-speed rotation of the flexible disk to guide the structural design and fatigue analysis of the flexible disk. However, since the flexible disk is in a closed cavity and accompanied by high-speed rotation, Its dynamic stress is very difficult to obtain

[0003] At present, most of the methods for obtaining the stress of the concerned parts of the flexible disc are based on the finite element simulation calculation, and the stress value of the concerned part is simply obtained by building a model, meshing, and inputting boundary conditions. However, due to the particularity of the flexible disc structure , the dangerous part model has low accuracy, inaccurate load boundary input and other factors, the stress value error of the dangerous part obtained by simulation calculation is generally relatively large; there are also some people in the industry who use the method of wired electric measurement to arrange strain gauges at the concerned parts, and through The strain signal is collected and the data is converted to obtain the stress value, but this method can only realize the test of the static stress, and cannot obtain the real stress state of the flexible disk under the working state

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