基于流固耦合的油底壳振动噪声预测分析

为了对油底壳的改进方案进行噪声预测,首先建立油底壳的流固耦合有限元模型,进行耦合模态计算,获得其固有频率和振型,通过模态试验验证了耦合有限元模型的准确性;其次,在发动机工作过程中,通过试验测得油底壳各螺栓固定处的振动加速度;再次,基于模态结果,在油底壳各螺栓固定处施加测试的振动加速度,采用有限元的分析方法对油底壳进行了强迫振动计算和辐射噪声计算,并进行了试验对比,结果表明该方法可用于发动机开发试验确认阶段,对油底壳改进方案进行振动噪声的预测,减小开发风险;最后,对含油量多少对辐射噪声的影响进行了对比分析。

Prediction Analysis of Vibration and Noise of Oil Pan Based on Fluid-Structure Coupled

In order to predict the noise of the improvement program of oil pan, firstly, the fluid-structure coupled finite element model of oil pan was established, and its natural frequency and mode shape are calculated. The accuracy of the coupled finite element model was verified by modal test. Secondly, the vibration acceleration of each bolt in the oil pan was measured by test during the working process of the engine. Thirdly, based on the modal results, the measured vibration acceleration was applied to the bolt fixtures of the oil pan, the computations of forced vibration and radiated noise of the oil pan were carried out by using the finite element analysis method, and the experimental comparison show that the method can be used to predict the vibration and noise of the oil pan during the confirmation stage of the engine development test, reduce the risk of development. Finally, the influence of oil content on radiated noise was analyzed.