Significant vibration reduction on the diesel generators is required. Targets are main engines and auxiliary engines for ocean investigation ships. Although passive mounting with rubber isolators on the engine has been usually used, the vibration reduction is not always sufficient. Expecting that the requirement to the vibration reduction will get stronger, the authors report the result of a study on the active vibration isolation system. The isolation effect by the single rubber mounting as well as the double rubber mounting was reviewed. The method of the active vibration isolation was investigated considering the necessary power and displacement. The actuator types were compared and the linear voice coil motor type was selected considering the big vibration reduction at the high frequency range. The mounting position of the actuator with the double rubber mounting was investigated as well. On the actual diesel engine generator with an engine revolution of 1500 rpm, the system was tested combined with the double rubber mounting and the intermediate mass. To reduce the vibration, the authors applied the feed forward control for each combustion frequency order of the engine up to 300 Hz. The vibration acceleration was measured. Two different dispositions of the actuators were tested. The test results showed that when actuators were mounted between the engine generator and the intermediate mass, it was difficult to control the vibration at the frequency of the resonance. On the other hand, it was easy to control when the actuators were mounted below the intermediate mass. It was proven that this controllability was strongly influenced by the condition number of the matrix of the frequency response. When the condition number was high by the resonance, the accuracy of the actuators' decoupling using the inverse matrix of the frequency response got poor and consequently the actuators could not generate the exact opposite phase acceleration. The test result revealed that the disposition of the actuators mounted below the intermediate mass was superior and significant vibration reduction, approximately 10 dB, from the passive isolation was achieved.
Active vibration isolation of a diesel engine generator with linear voice coil motors
Aktive Schwingungsisolierung eines Dieselgenerators
2004
10 Seiten, Bilder, 5 Quellen
Conference paper
Storage medium
English
Active vibration isolation of a diesel engine generator with linear voice coil motors
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