A step-variable permanent magnet rheological damper

Abstract

The invention relates to an order-variable permanent magnet rheological damper and belongs to the field of mechanical vibration engineering. The order-variable permanent magnet rheological damper is a non-power-supply damping vibration absorber. The on-off states of a permanent magnet circuit are controlled by changing the magnetic permeability and the axial effective length of an inner cylinder tube, so that the output damping force, changing along with the piston stroke, of the permanent magnet rheological damper is adjusted, order-variable output of coulomb damping force is achieved, preset damping force is obtained, and effective shock absorption is conducted. An inner cylinder tube section of the order-variable permanent magnet rheological damper is formed by fixedly connecting one section of magnetic-permeability material cylinder tube and two sections of non-magnetic-permeability material cylinder tubes, and a permanent magnet structure piston is a multilevel electromagnetic circuit. The permanent magnet rheological damper is free of energy consumption, simple in structural design and high in stability and has other shock absorption properties.

Description

technical field [0001] The invention relates to a permanent magnet rheological vibration control technology, in particular to a stepped permanent magnet rheological damper. Background technique [0002] The magnetorheological damper is a most promising semi-active control device developed by using the rheological characteristics of magnetorheological fluid. It has both the reliability of passive control and the adaptability of active control, and compared with active control Low energy consumption, wide dynamic range, fast response, low energy consumption, simple mechanical structure, strong environmental robustness, easy to combine with microcomputer control and other outstanding advantages. Magnetorheological dampers have been widely used in vibration control systems, such as vehicle suspension systems, aircraft landing gear systems, building earthquake protection systems, cable-stayed bridge protection systems, medical rehabilitation systems and other fields. [0003] Th...

AI Technical Summary

Problems solved by technology

With the wide application of magnetorheological dampers, the application of magnetorheological dampers is limited to some extent in some vibration applications where the power supply cannot be reached or the power supply is inconvenient to replace.

For this reason, in recent years, a class of self-powered magnetorheological dampers has emerged, which mainly uses energy harvesting devices that convert external mechanical vibration energy into electrical energy to replace the power supply to meet the electrical energy requirements of magnetorheological dampers Due to the relatively low harvesting energy of energy magnetorheological damper system, the application environment is limited, and the system stability is relatively low

[0004] In addition, in addition to the power supply, the external equipment required by the magnetorheological damper also needs related equipment such as sensors and controllers. The sensors test the structural response, and the controller calculates the control commands. The entire vibration control system becomes relatively complex, and the system stability is relatively low, and at the same time, the system design cost is relatively high

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