A Study of Active Vibration Isolation

1985 ◽  
Vol 107 (4) ◽  
pp. 392-397 ◽  
Author(s):  
N. Tanaka ◽  
Y. Kikushima
Keyword(s):  
Vibration Isolation ◽  
Control Method ◽  
Feedforward Control ◽  
Ground Vibration ◽  
Design Parameters ◽  
Isolation Method ◽  
Isolation System ◽  
Active Isolation ◽  
Active Vibration ◽  
Active Vibration Isolation

For the purpose of suppressing ground vibration produced by vibrating machines, such as forging hammers, press machines, etc., this paper presents an active vibration isolation method. Unlike conventional isolators, the active isolator proposed in this paper permits rigid support of the machines. First, the principle of the active isolation method is shown, and the system equations are derived. Secondly, the characteristics and the design parameters of the active isolation system are presented. Thirdly, from the point of view of the feedforward control method, the dynamic compensators are designed so as to sufficiently suppress the exciting force. Finally, an experiment is carried out to demonstrate that the active isolator is applicable for suppressing the ground vibration.

Optimal Design of Active Vibration Isolation System

1988 ◽  
Vol 110 (1) ◽  
pp. 42-48 ◽  
Author(s):  
N. Tanaka ◽  
Y. Kikushima
Keyword(s):  
Optimal Design ◽  
Vibration Isolation ◽  
Optimization Technique ◽  
Design Procedure ◽  
Ground Vibration ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Active Vibration ◽  
Series Type ◽  
Active Vibration Isolation

In order to eliminate ground vibration produced by machines such as forge hammers, press machines, etc., this paper presents a systematic and optimal design procedure of an active vibration isolation system which permits rigid support of machines. First, the principle of the active vibration method is presented. Secondly, from the viewpoint of feedback control, the active vibration isolation system with a series-type dynamic compensator is constructed. Thirdly, with the air of a parameter optimization technique, the necessary conditions for optimality of the system are derived. Fourthly, for the purpose of solving the conditions, an iterative algorithm based upon a quasi-Newton method is proposed. Finally, by using the design procedure, the active vibration isolation system is designed, and the effectiveness to isolate the vibration is discussed.

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

2012 ◽  
Vol 150 ◽  
pp. 80-84
Author(s):  
Jin Guang Zhang ◽  
Nan Xiang ◽  
Zuo Chao Xiao ◽  
Guo Ping Ding
Keyword(s):  
Vibration Isolation ◽  
Feedforward Control ◽  
Lms Algorithm ◽  
Vibration Source ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Active Vibration ◽  
Simulation Results ◽  
Adaptive Feedforward ◽  
Active Vibration Isolation

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.

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

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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