Research on Adaptive Feedforward Control Algorithm of Electromagnetic Active Vibration Isolation System

Feedforward control method to control vibration in the active vibration isolation system was discussed. By introducing the FIR filter as the feedforward link, using the mean-square deviation of system error as the performance index and utilizing the LMS algorithm to obtain the optimal parameters of controller, the design of adaptive feedforward controller was fulfilled. The simulation results showed that: for the active vibration isolation system with regularly vibration source, adopting adaptive filter method of feedforward control has notable effect. The contrast experiment with using the PID controller further verified the simulation results.

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Active Vibration Isolation of a Diesel Generator in a Small Marine Vessel: An Experimental Study

Applied Sciences ◽

10.3390/app10093025 ◽

2020 ◽

Vol 10 (9) ◽

pp. 3025

Author(s):

Tiejun Yang ◽

Lei Wu ◽

Xinhui Li ◽

Minggang Zhu ◽

Michael J. Brennan ◽

...

Keyword(s):

Vibration Isolation ◽

Feedforward Control ◽

Reference Signal ◽

Electrical Circuit ◽

Diesel Generator ◽

Isolation System ◽

Vibration Isolation System ◽

Active Vibration ◽

Adaptive Feedforward ◽

Active Vibration Isolation

An active vibration isolation system is retrofitted to a diesel generator set in a tugboat to determine the effectiveness of such a system in a realistic practical environment. The system consists of six bespoke inertial actuators chosen to make minimal modifications to the machinery arrangement, and a DSP-based controller. Six accelerometers are collocated with the actuators on the top of six isolators to act as error sensors, and six accelerometers are placed below the isolators to give a measure of the global vibration of the ships structure below the generator set. A hydrophone is also placed in the water to give an indication of the underwater noise due to the generator. The control strategy employed is six-input and six-output decentralized adaptive feedforward control with the reference signal being derived from the signal from an optical tachometer on shaft between the engine and the generator. To suppress the vibration at all the dominant forcing frequencies, an electrical circuit generated the half engine orders required from the measured reference signal. The experimental results show that the combination of the active control system and the passive isolators is effective in reducing the global vibration and the acoustic pressure at the hydrophone position.

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PID Control of Multisources Complex Excitations Active Vibration Isolation System: An Improved Particle Swarm Optimization Algorithm

Shock and Vibration ◽

10.1155/2016/3486959 ◽

2016 ◽

Vol 2016 ◽

pp. 1-15 ◽

Cited By ~ 1

Author(s):

Song Chunsheng ◽

Jiang Youliang ◽

Zhang Jinguang

Keyword(s):

Pid Control ◽

Vibration Isolation ◽

Control Model ◽

Control Effect ◽

Swarm Optimization ◽

Isolation System ◽

Vibration Isolation System ◽

Active Vibration ◽

Simulation Results ◽

Active Vibration Isolation

Active vibration isolation technology is the key technique to solve the vibration isolation problems related to the multisources complex excitations vibration isolation system. The electromagnetic actuators-based multisources complex excitations active vibration isolation system is built. Additionally, in view of the complex structure and strong coupling of the system, the least-squares method to identify and obtain the mathematical model of the vibration isolation system is adopted. Furthermore, this paper also sets up the acceleration feedback-based PID control model for multisources complex excitations active vibration isolation system, proposes an improved particle swarm optimization (PSO) algorithm of dynamic inertia weight factors used to optimize parameters of the built PID control model, and conducts simulation analysis. The simulation results show that, compared with the passive system before the control, the multisources complex excitations active vibration isolation system under the PID control has the far less peak-to-peak amplitude of acceleration which is transmitted to the foundation and has the much better vibration isolation effect. Finally, the paper conducts experimental verification, which demonstrates that active vibration control effect is identical to the simulation results and the vibration control effect is significantly improved.

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