Microscopic observation method and device for rheological property of magnetorheological fluid

Abstract

The invention discloses a magnetic field stepless adjustable microscopic dynamic change observing method and device for magnetorheological fluid under the actions of an optical microscope and an ultrasonic near field. The method and the device are characterized in that an ultrasonic near-field generation device based on an ultrasonic energy converter is used for stimulating bent vibration of a vibration plate by using longitudinal vibration of the energy converter in order to apply an ultrasonic field to the magnetorheological fluid in a cavity; a magnet yoke is made of an electric pure-iron material, so that a magnetic induction line is limited in a designed magnetic path, magnetic leakage is lowered, and the magnetic sensing strength in the magnetorheological fluid cavity is uniform. A linear ultrasonic motor is adopted for driving a shearing block to apply shearing force to the magnetorheological fluid. The device has the advantages of simple method and structure, small size and good working effect, and can be widely applied to magnetorheological fluid mechanism researches under multi-field coupling.

Description

technical field [0001] The present invention relates to the technology of ultrasonic near-field manipulation of microscopic particles and the technology of magnetorheological fluid materials, in particular to a device for observing the rheological characteristics of magnetorheological fluid, specifically a magnetorheological fluid in the ultrasonic near-field and magnetic field A microscopic observation method and device for magnetic particles and rheological phenomena in a coupled magnetorheological fluid. Background technique [0002] An ultrasonic field is a mechanical wave whose vibration frequency is in the ultrasonic frequency range. A strong acoustic radiation force will be generated at a position very close to the mechanical wave radiation surface, and the position of the particles can be controlled through the change of the acoustic radiation force to achieve the purpose of microscopic particle control. This is also one of the focuses of research in the field of ul...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that there is no method and device that can simultaneously observe the action of ultrasonic waves and magnetic fields on magnetorheological fluids, which cannot realize effective observation and research, and restricts the development of this work. A method and device for applying ultrasonic near-fields and magnetic fields of different intensities to magnetorheological fluids, and visually observing the microscopic rheological processes of magnetorheological fluids under the coupling effects of different intensities of ultrasonic fields and different intensities of magnetic fields or under the separate actions of a single field

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