Testing device for magneto-rheological fluid shear yield stress

Abstract

The invention relates to a device used for testing magneto-rheological fluid shear yield stress. The testing device mainly comprises an adjustable uniform magnetic field generating device, a steel barrel, a rotary shaft, a seal ring cover plate, a support, a motor, a torque sensor, a Hall piece, a data demodulation single-chip microcomputer and a testing display instrument. The testing device has the advantages that the magnetic field generating device can generate a large adjustable uniform magnetic field; wall face sliding can be prevented from occurring to magneto-rheological fluid under the condition that the magnetic field exists; a testing and displaying device enables weak voltage difference signals to be output onto the testing display instrument accurately in real time through a torque sensor, the PWM theory, a signal amplifying circuit and A / D conversion; a low-reluctance closed loop is formed on the outer side of a close-wound coil through industrial pure iron, and a coil fixing frame on the inner side of the close-wound coil is made of nylon materials so that more magnetic lines can pass through the magneto-rheological fluid. The magneto-rheological fluid is arranged in the center of the magnetic field generating device, so that the magnetic induction strength generated by the detected magneto-rheological fluid is distributed evenly and perpendicularly.

Description

technical field [0001] The invention is a test device for measuring the shear yield stress of magnetorheological fluid under different rotating speeds and different magnetic fields. Background technique [0002] Magnetorheological fluid is a new kind of smart material, which is a non-colloidal suspension liquid with controllable rheological characteristics as the external magnetic field changes. When an external magnetic field acts, its physical form changes rapidly within milliseconds, from liquid to solid-like. In recent years, magnetorheological dampers, which are widely used in engineering, are made by making full use of the adjustable intelligent characteristics of magnetorheological fluids. Therefore, the mechanical properties of magnetorheological fluids directly affect the performance of dampers. Accurate measurement and evaluation of the rheological properties of magnetorheological fluids is the prerequisite for the wide application and development of magnetorheolo...

AI Technical Summary

Problems solved by technology

[0004] Technical problem: The present invention is a device for testing the shear yield stress of magnetorheological fluid. The device can measure the shear yield stress of magnetorheological fluid under different magnetic fields and different rotational speeds, and can solve the problem of magnetorheological fluid under the condition of strong magnetic field of traditional testing devices. Disadvantages such as liquid wall slip effect, low measurement accuracy and uneven magnetic field

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