船舶推进轴系校中对轴系振动影响分析

随着船舶振动噪声要求的提高,现有的静态校中设计方法不再适用,需要考虑轴系校中过程中不对中量对轴系振动的影响.通过对弹性联轴器处三种不对中型式进行受力分析,获得了不对中激励力数学模型,通过台架试验验证了数学模型的准确性.研究表明:轴系不中激励作用下,1倍频和2倍频以及通频振动计算结果与台架试验相对误差小于20%;校中过程中弹性联轴节处不对中量绝对值越大,所产生的激励的幅值越大,造成的振动也越大.

Analysison the effect of marine propulsion shafting alignment on itsvibration

With the improvement of marine vibration index, the current static shafting alignment method is not yet suitable. The effect of shafting misalignment on rotating system vibration is not clear. Based on the mechanics analysis on elastic coupling of three different types of misalignment, the dynamic models of misalignment excitation are first established, and this dynamic model is also verified by bench test. The results show that under the excitation of shaft misalignment, the relative errors between the simulation results for the situations of synchronous harmonic, second harmonic and peak peak vibration and the bench test data are less than 20%. Moreover, it is found that the increasing misalignment of elastic coupling results in strong vibration, accompanying with increasing excitation amplitude.