A magnetorheological semi-active rolling mass pendulum damper

Abstract

The invention provides a magneto-rheological semi-active rolling type mass pendulum damper, and belongs to the field of structural vibration control in civil engineering. The magneto-rheological semi-active rolling type mass pendulum damper comprises a magneto-rheological track device, a rolling shaft and balancing weights. The track is a circular arc-shaped track, the balancing weights are connected through the rolling shaft and move in a reciprocating mode along the track, and therefore the purposes of energy dissipation and vibration attenuation are achieved. A closed magneto-rheological device is arranged inside a slideway according to the design, an external power source is used for adjusting magneto-rheological fluid properties to control rolling resistance of the rolling shaft inside the track, and then rolling angles and rolling speeds of the rolling shaft are controlled. The magneto-rheological semi-active rolling type mass pendulum damper is applicable to flexible structures and high-rise structures of civil engineering structures, breaks the limit that rolling mass damper control force is uncontrollable, and is low in power dissipation and high in force output; semi-active control over the rolling tuning mass pendulum damper can be realized only through a small number of currents.

Description

Technical field: [0001] The invention belongs to the field of vibration control of civil engineering, specifically, it is a semi-active control damper for controlling the radial movement speed and swing angle of a mass pendulum through the magneto-rheological system of the pendulum shaft, so as to adjust the control force. Background technique: [0002] Pendulum Tuned Mass Dampers (PTMD) as an energy-dissipating vibration-reduction device has been more and more recognized due to its good control effect and has broad application prospects. There are two types of tuned mass pendulum dampers: suspended PTMD and orbital PTMD. Suspended PTMD is to suspend the counterweight on the top of the controlled structure with a suspension wire (suspension rod), and the counterweight makes a single pendulum reciprocating movement along the arc track. This form of damper requires a large length of suspension wire or boom, and the space utilization rate is low. Suspend the mass block on the...

AI Technical Summary

Problems solved by technology

For the traditional PTMD, there are the following problems: (1) When the controller is running, the damping of the controller cannot be adjusted, and usually the damping of the PTMD is higher than that of the controlled structure, so there is often such a phenomenon: when the external The excitation has stopped, the structural vibration has been attenuated, but the PTMD is still reciprocating, forcing the structure to continue to vibrate, which makes the control effect just the opposite

(2) In the traditional PTMD swing process, the control force cannot be adjusted, and it is impossible to adjust the control force in real time according to the external excitation and structural characteristics to achieve the optimal control effect

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