| In the normal navigation process of ship, propeller longitudinalexcitation force can be passed to the hull through shafting, which couldcause the hull’s vibration. Then, this condition would have bad effect onthe ride comfort or stealth performance about the underwater ship. Thus, itis very important to reduce the longitudinal vibration of ship’s shafting.This paper has analyzed the dynamics of the ship shafting, proposed theidea of using magnetorheological elastomer (MRE) to design a kind ofdynamic vibration absorber (DVA) with wideband by its characteristic canbe adjusted. Specifically, the main findings and conclusions are as follows:1. This paper has established a dynamic model of the shafting, and onthis basis, through using the method of modal synthesis and modaltruncation method,we have listed the equation about structure of the DVA,as the lumped parameter system, installed to the continuous system ofshafting For the the target of the movement about the main systemamplification factor, the parameters of DVA have been optimized, andprovide a reference to the design of DVA. 2. The paper has summarized the research progress of MRE, designed adynamic vibration absorber using one kind of MRE, analyzed the modaland electromagnetic field; according to the results of modal andelectromagnetic field analysis, the relationship of DVA’s frequency andapplied current changes was fitted.3. Having installed the DVA on the ship shafting, in the set DVA’sfrequency range, I have compared the vibration control about conventionalpassive DVA and MRE-DVA, the results can be referenced for the currentcontrol. In the full frequency band, after having done the harmonicresponse analyze, I have get the passive DVA and MRE-DVA’s vibrationcontrolling results, at the same time, vibration absorption effect with thechange of assembled DVA’s number and installation location had beendiscussed, which would provide reference for the following work. |
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