Active vibration absorber with flexible structure and control method thereof

Abstract

The invention discloses an active vibration absorber with a flexible structure and a control method thereof. The active vibration absorber comprises a signal acquisition unit and a control vibration absorption unit; in the signal acquisition unit, the flexible structure is provided with an ICP acceleration transducer, and a signal is transmitted to a constant current source, a data acquisition device and an analog/digital converter in turn and then transmitted to a computer to be processed; and in the control vibration absorption unit, a computer control signal is transmitted to the analog/digital converter and a first power amplifier and then transmitted to an actuator to execute vibration absorption. In order to simulate external excitation, the active vibration absorber is provided with an exciting force output unit, a signal generator of the unit is connected with an input end of a second power amplifier, a signal generated by the signal generator is amplified by the second power amplifier and then input to a vibration exciter, and the vibration exciter is connected with the flexible structure through a post rod to provide external disturbance. The method mainly comprises an off-line recognition process and a real-time control process. A random walk and input estimation method is introduced into active vibration control of the flexible structure, and good control effect is acquired from an experimental angle.

Description

technical field [0001] The invention relates to an active vibration damping device, which is suitable for active vibration control of flexible structures, especially suitable for the situation where the parameters of the controlled structure are unknown, and its functions include parameter identification and vibration control. In particular, the invention relates to a method and a device for collecting and processing signals and enabling an actuator to work effectively. Background technique [0002] Vibration control is an important branch in the field of vibration engineering, which can be divided into passive control and active control. Because passive control does not require external energy, the structure of the device is simple, and the vibration reduction effect and reliability are good in many occasions, it has been widely used. However, with the development of science and technology, people have higher and higher requirements for the vibration environment, product a...

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Problems solved by technology

[0007] (1) The sensor detection signal contains signals of multiple frequency components and noise interference, but only one or a few frequency components are required in the actual control algorithm, and there is a phenomenon that the detection signal interference is serious;

[0008] (2) For problem (1), filters are usually used in the signal processing process, but whether it is an analog filter or a digital filter, it will cause a signal phase shift, and the higher the order of the filter, the greater the phase shift Serious, distorting the phase of the control signal

In addition, the current phase compensation technology has great limitations, and cannot effectively compensate the large phase shift generated by the high-order filter in the whole frequency band;

[0009] (3) The information about the external disturbance of the system, that is, the vibration source, is not well understood. Usually, the external disturbance of the system cannot be directly measured. Usually, the signal detected by the sensor can only be used to judge the vibration of the system, and the control input can be obtained at the same time, which limits the system to a certain extent. Control effect

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