CAJ | 학술논문

准确预测车辆内部对发动机力矩输入的声学灵敏度（即P/T）对车辆前期NVH开发具有重要意义，建立详细的整车结构及声腔流体有限元模型，并推导流体—结构耦合有限元方程，进行P/T仿真计算，并在相同边界条件下进行试验。仿真结果与试验值在30 Hz～100 Hz有较好一致性，但在10 Hz～30 Hz低于试验值。通过对传递路径中的悬置隔振及动力总成刚体模态进行仿真与试验对比分析，发现悬置低频动刚度特性对P/T灵敏度有较大影响。根据悬置低频动刚度特性调整悬置动刚度，仿真计算与试验值在整个频带即0～100 Hz皆有较好的一致性。仿真与试验结果为车辆开发前期进行车内噪声水平控制提供一定参考。
준학예측차량내부대발동궤력구수입적성학령민도（즉P/T）대차량전기NVH개발구유중요의의，건립상세적정차결구급성강류체유한원모형，병추도류체—결구우합유한원방정，진행P/T방진계산，병재상동변계조건하진행시험。방진결과여시험치재30 Hz～100 Hz유교호일치성，단재10 Hz～30 Hz저우시험치。통과대전체로경중적현치격진급동력총성강체모태진행방진여시험대비분석，발현현치저빈동강도특성대P/T령민도유교대영향。근거현치저빈동강도특성조정현치동강도，방진계산여시험치재정개빈대즉0～100 Hz개유교호적일치성。방진여시험결과위차량개발전기진행차내조성수평공제제공일정삼고。
It is important to accurately calculate the sound pressure in vehicles induced by the powertrain torque excitation for advanced vehicle development. In this paper, a detailed finite element model for whole vehicle structure including the fluid in the acoustic cavity was established. The fluid-structure coupled finite element equations were formulated. The model was validated with the method of modal assurance criterion. Based on the model, the acoustic sensitivity defined by sound pressure over torque, P/T, was calculated. The test was carried out under the same boundary condition. It is shown that the simulation result has a good agreement with the test result in 30 Hz-100 Hz frequency range, while in 10 Hz-30 Hz frequency range the simulation result of P/T is lower than that of the test. The simulation and tests of the mount isolation and powertrain rigid-body modals were completed and the results were analyzed. It was found that the mount low-frequency dynamic-stiffness characteristics have large influence on P/T. When the mount dynamic-stiffness value increases, the P/T results of simulation and tests have a good consistency in whole frequency band of 0-100 Hz.