Magnetic shape memory alloy (MSMA) flexible actuator

Abstract

The invention discloses a magnetic shape memory alloy (MSMA) flexible actuator, which comprises a shell, wherein the upper end and the lower end of the shell are connected with an upper end cover and a lower end cover; an MSMA rod is positioned on a central shaft of the shell; magnetic conduction sheets are arranged at the two ends of the MSMA rod; a lower non-magnetic conduction base plate is arranged on the upper side of the lower end cover; an upper non-magnetic conduction base plate is arranged on the lower side of the upper end cover; the upper end of a lead-out rod is extended out of a central hole in the upper end cover; the space between the upper side of a middle step of the lead-out rod and the upper end cover as well as the space between the lower side of the middle step of thelead-out rod and the upper non-magnetic conduction base plate are provided with a disc spring respectively; a coil framework and a permanent magnet are arranged outside the MSMA rod sequentially; andan excitation coil is wound on the coil framework. In the actuator, the disc springs are used for applying prepressing force onto the MSMA rod, the length of the MSMA rod is changed along with the change of a magnetic field generated by the excitation coil and the permanent magnet, and corresponding displacement is output to the outside through the lead-out rod. The actuator has a simple structure, high frequency response, large strain, a wide using frequency band and low driving voltage.

Description

technical field [0001] The invention belongs to the technical field of shock absorbing equipment, and in particular relates to a magnetically controlled shape memory alloy telescopic actuator, whose main function is to apply a certain control force to a control structure according to a control law, so as to achieve the effect of vibration reduction. Background technique [0002] Structural vibration control is to install some control devices in some parts of the structure, apply a set of control force or adjust the dynamic characteristics of the structure when the structure vibrates, which is helpful for improving the earthquake resistance and wind resistance of civil engineering structures, reducing the structural vibration response, reducing Disaster loss is of great significance to meet the structural safety and functional requirements. After decades of development, in terms of active control, structural control technology and smart materials have been developed rapidly....

AI Technical Summary

Problems solved by technology

However, the current actuators based on some smart materials for structural vibration control generally have disadvantages such as low frequency response, small displacement, high driving voltage, and poor safety.

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