Semi-active vibration absorber control system based on state observation

Abstract

The invention discloses a semi-active vibration absorber control system based on state observation. The semi-active vibration absorber control system is characterized by being composed of a semi-active suspension system, a state observation module, a phase difference cosine value calculation module and a current output module. The semi-active suspension system comprises a vibration reducing object, a semi-active vibration absorber, a passive vibration isolator and a sensor mounted on the vibration reducing object or the semi-active vibration absorber, and is used for detecting vibration information corresponding to the output vector of the semi-active suspension system in real time. The state observation module comprises an analog-digital converter, a self-adaption state observer and a state processing unit, and is used for predicting related vibration information corresponding to the related state vector of the semi-active suspension system in real time. The current output module is composed of a fuzzy logic control unit, an integrator and a controlled current source, and is used for outputting control current needed by the semi-active vibration absorber in real time. The semi-active vibration absorber control system can control vibration of a semi-active vibration absorber system fast, stably and effectively only through one sensor.

Description

technical field [0001] The invention relates to a semi-active vibration absorber control system based on state observation, more specifically, a control system suitable for automobile engine mount systems, new energy vehicle powertrain mount systems, ship power systems, medical equipment systems, and special equipment carrying Magneto-rheological elastomer vibration absorber vibration control system that uses rotating machinery as power for devices, machine tool processing equipment, etc. Background technique [0002] While rotating machinery provides power for engineering applications, it also brings vibration disturbance to the system, and the frequency of vibration disturbance is proportional to its rotational speed. Taking the powertrain of an internal combustion engine as an example, when the internal combustion engine is working, the pitching moment generated by the cylinder pressure and the reciprocating inertial force is the main vibration excitation of the internal ...

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Problems solved by technology

[0006] However, due to the complex working conditions of rotating machinery, the excitation of rotating machinery, including its excitation frequency and excitation amplitude, is always changing, and it is very difficult to accurately identify the frequency of the vibration signal of rotating machinery

On the other hand, since the hysteresis modulus of the magnetorheological elastomer is not only related to the magnitude of the applied magnetic field, but also related to the strain and excitation frequency of the magnetorheological elastomer, the relationship between the hysteresis modulus of the magnetorheological elastomer and the applied magnetic field It is difficult to establish an accurate mathematical model between

Therefore, in the vibration control of the semi-active suspension system of rotating machinery, the existing MRE dynamic shock absorber control algorithm based on excitation frequency identification is difficult to work effectively

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