Abstract
In order to improve the signal natural frequency of dynamic vibration absorber and eliminate the influence of nonlinear output force to the adaptive vibration absorption system. A new type of electromagnetic active vibration absorber is designed in this article. The internal magnetic circuit structure is changed through the electromagnet placed on the upper and lower, produce the electromagnetic force in two directions. Reaction force of upper mass is used to eliminate the target vibration. The effective frequency range of the vibration absorption increases, output force is basically linear. Aimed at multiple-point adaptive control strategy, a distributed multi-channel adaptive control algorithm is proposed, in which coupling between channels can be compensated on each control loop. Influence of secondary path on active control is analyzed, put forward the improved least mean square algorithm to identify the secondary. Active vibration control experiment platform is structured to verify the output force of absorber, and engineering application of the distributed multi-channel adaptive control algorithm. The results show that the distributed multi-channel adaptive control algorithm system has about 15 dB noise reduction, effect is obvious; new type of electromagnetic active vibration absorber is not limited to the natural frequency, output force can adaptive keep pace with the excitation frequency.
Highlights
Vibration absorption is an important branch in the field of vibration engineering
The electromagnetic active vibration absorber designed in this article can provide electromagnetic force in both directions through the electromagnets in upper and lower of soft iron, without applying the bias current
Identification of secondary path are fed back to the control system to carry out the adaptive vibration absorption experiment, in which, the orders of two control filter are 128 and the initial value is zero
Summary
Vibration absorption is an important branch in the field of vibration engineering. According to the realization method, it can be divided into passive vibration absorption, semi-active vibration absorption and active vibration absorption. Absorption of vibration is a widely used decreasing vibration technology It has been more than one hundred years since the first DVA (Dynamic Vibration Absorber) was invented in 1902. According to the principle of work and design criterion of DVA, there are two types of the active dynamic vibration absorbers: frequency-nonadjustable DVA and frequency-adjustable DVA. RESEARCH OF MULTI-POINT ADAPTIVE CONTROL STRATEGY BASED ON ELECTROMAGNETIC ACTIVE VIBRATION ABSORBER. In order to reduce the influence of the nonlinear error, a new electromagnetic active vibration absorber is designed by optimizing the magnetic circuit structure. The output force of electromagnetic active vibration absorber can change with the input current linearly. Distributed multi-channel adaptive control algorithm is designed to solve above problems, and has achieved good vibration absorption effect in the experiment.
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