Device and method for testing static and dynamic variable friction of telescopic mechanism

Abstract

The invention discloses a device and a method for testing static and dynamic variable friction of a telescopic mechanism. The device comprises a test bed, a loading device, the telescopic mechanism and a test device. An outer tube of the telescopic mechanism is fixed on the test bed through an adaptation tool, an electromechanical loading device is connected with an inner tube of the telescopic mechanism through a steel wire rope and a tension sensor to exert axial load on the telescopic mechanism. The front end of the inner tube of the telescopic mechanism applies transverse load through a section counter weight. The tension sensor measures the horizontal tension applied by the loading device, a low-frequency acceleration sensor is installed at the front end of the counter weight to measure the swinging acceleration and the additional tension caused by the counter weight, a pull rope displacement sensor is used for measuring the horizontal sliding displacement of the inner tube, and strain foils are bonded to the outer tube at different positions to monitor the deformation conditions of the outer tube in the sliding process of the inner tube. The device has the advantages of being convenient to use and operate, stable and reliable in performance, high in measurement accuracy, wide in application range and the like.

Description

technical field [0001] The invention relates to the field of static and sliding friction measurement, in particular to a test device and a test method for the static and dynamic friction of a sleeve mechanism under the action of lateral load. Background technique [0002] Static and sliding friction widely exist in mechanical connections in automotive, aviation, aerospace and other industrial fields, and are important factors for obtaining accurate results in static dynamics theoretical research and numerical simulation analysis, and are also important factors affecting test results. Since the mechanism of friction is not completely clear, it is difficult to theoretically analyze and obtain the friction of large-scale mechanisms, so testing is one of the common methods to obtain static and dynamic friction. The telescopic mechanism is a commonly used actuating device, and there is inevitably a lateral load during use. Therefore, a telescopic mechanism is designed for the tel...

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Problems solved by technology

So far, friction test devices include spring dynamometer-sliding plate type simple device, complex device for testing the friction force between engine air / oil cylinder piston and cylinder wall, etc. It is a test device for static and dynamic friction under load, and there are some disadvantages for the simple device and complex device of the telescopic mechanism as follows:

[0003] (1) The simple test device is difficult to guarantee the state of uniform motion;

[0004] (2) The simple test device is difficult to ensure that there is no relative rotation between the inner and outer cylinders, and it is also difficult to ensure that the direction of the pulling force and the axes of the inner and outer cylinders are on the same horizontal line

[0005] (3) For the sleeve-type mechanism, the above-mentioned test device is difficult to test the friction between the inner and outer cylinders under the action of lateral load;

[0006] (4) For the sleeve-type mechanism, it is difficult for the above-mentioned test device to test the change law of static and dynamic friction with the relative displacement of the inner and outer cylinders

[0007] Therefore, it can be seen that these methods are not suitable for testing the static and dynamic friction of the sleeve mechanism under the action of lateral load. It is very necessary to develop a new measurement system for the static and dynamic friction of the sleeve mechanism.

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