Initiative electromagnetic control system for slab and girder structure vibration

Abstract

The invention discloses an initiative electromagnetic control system for slab and girder structure vibration. The initiative electromagnetic control system comprises a mechanical portion and a control portion. The mechanical portion comprises a wall made of nonferromagnetic materials, a slab and girder structure and electromagnets. One end of the slab and girder structure is connected with the wall, a displacement sensor is arranged on the slab and girder structure, and the electromagnets include electromagnets A, B, C and D. The control portion comprises a computer, a power amplifier and a full-wave rectification circuit without a filter. The computer is connected with the displacement sensor, an input end of the power amplifier is connected with the computer, one path of an output end of the amplifier is connected with the electromagnets A and D through a bridge rectification circuit without a filter while the other path of the same is directly connected with the electromagnets B and C. When the slab and girder structure vibrates, magnetic pole polarity and magnetic field intensity of the electromagnets can be automatically changed to attenuate the vibration quickly, so that damages to a mechanical system caused by vibration are reduced.

Description

technical field [0001] The invention relates to the technical field of mechanical vibration and noise control, in particular to an active electromagnetic control system for plate girder structure vibration. Background technique [0002] When any mechanical system is dynamically excited or disturbed, it will produce a response, manifested as structural vibration and noise, which will not only reduce the performance of the mechanical system, but also endanger human health. With the development of aerospace, precision machinery, micro-nano technology, etc. With the development of the field, the suppression of structural vibration has become an important research topic in the design of various systems. However, most of the existing technologies are controlled by means of additional damping and piezoelectric smart structures, which have the following disadvantages: [0003] 1) Due to frequent changes in the operating load and operating conditions of the equipment, the severity o...

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Problems solved by technology

[0003] 1) Due to frequent changes in the operating load and operating conditions of the equipment, the intensity of the vibration is also changing. Once the ordinary additional damping structure is fabricated and installed, the damping coefficient cannot be changed. When the mechanical system operates in an environment Changes, especially resonance, do not inherently have the ability to increase damping

[0004] 2) For piezoelectric smart structures, due to the limited force of the existing piezoelectric actuators on the vibrating structure, the control effect is often affected

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