Intelligent system for controlling damping of mechanical structure

Abstract

The invention discloses an intelligent system for controlling damping of a mechanical structure. The system comprises a damping material layer, a piezoelectric actuator layer, a sensor, a damping control system and the like, wherein the lower part of the damping material layer is connected with a matrix of a vibration structure, and the upper part is connected with the piezoelectric actuator layer; the piezoelectric sensor is connected with the lower surface or the upper surface of the matrix of the vibrate structure; hardware of the damping control system mainly comprises a computer, an NI-PCI 4472 board card, a DAQ (data acquisition) board card, a charge amplifier, a power amplifier and the like; the piezoelectric sensor is connected with the NI-PCI 4472 board card through the charge amplifier; the NI-PCI 4472 board card is connected with the piezoelectric actuator layer through the DAQ board card and the power amplifier; the sensor is a piezoelectric sensor; and the damping control system adopts an NI control system and a damping control algorithm module, so that the structural damping can be changed spontaneously, the vibration is attenuated, the damage to a mechanical system caused by vibration is reduced, the device accuracy is maintained, the service life is prolonged, the noise pollution of a structure to the environment is inhibited, and the mental and physical health of an operator is guaranteed.

Description

technical field [0001] The invention relates to the technical field of mechanical vibration and noise control, in particular to an intelligent control system for the damping size of a mechanical structure. Background technique [0002] Vibration widely exists in mechanical systems under various working conditions, such as automobiles, trains, ships and other vehicles and aircraft, rockets, satellites and other aircraft. Strong vibration will not only affect the precision and stability of instrumentation work, but also shorten the life of the structure due to fatigue damage, or damage the structure due to resonance. At the same time, the noise generated due to vibration not only causes environmental pollution, but also endangers the physical and mental health of operators. Therefore, it is necessary to reduce the vibration of the equipment. However, judging from the current research status, most of them are controlled by the method of adding damping materials, but it has the...

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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 material layer is fabricated and installed, its damping value cannot be changed. When the operating environment of the mechanical system changes Severe vibration, especially at resonance, does not have the ability to increase damping

[0004] 2) At present, in the method of passive vibration isolation, when the foundation has low-frequency vibration, increasing the damping can greatly reduce the amplitude of the structure; but under the high-frequency excitation of the foundation, increasing the damping will actually increase the amplitude of the structure

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