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建立了汽车噪声预测的统计能量分析(SEA)模型,模型共分成42个子系统。在模型的两侧创建半无限流场。规则结构的结构损耗因子和模态密度可以用解析公式计算。复杂子系统的模态密度采用有限元法计算。结构-结构之间,结构-空腔之间的耦合损耗因子采用解析公式进行计算。通过发动机悬置元件主动被动侧之间的加速度传递关系计算发动机对车身的激励力。通过声压法测量发动机的声功率作为模型中发动机声激励。利用多体动力学仿真手段计算悬架对车身的激励。运用计算流体力学的方法计算风激励。通过实验的手段测量排气噪声和轮胎噪声。运用该SEA模型对车外噪声进行了预测,车外噪声比实际测量值高1.41dB(A),误差为1.94%。结果表明,利用SEA模型进行车外噪声预测的方法可以应用到汽车产品开发阶段。
The statistical energy analysis (SEA) model of car noise prediction is established. The model is divided into 42 sub-systems. Create a semi-infinite flow field on both sides of the model. The structural loss factor and modal density of the regular structure can be calculated using analytic formulas. The modal density of complex subsystems is calculated by finite element method. Structural-structural, structural-cavity coupling loss factors are calculated using analytical formulas. The excitation force of the engine on the vehicle body is calculated by the acceleration transmission relation between the active passive side of the engine suspension element. The sound pressure of the engine is measured by sound pressure as the acoustic excitation of the engine in the model. Using Multibody Dynamics Simulation Method to Calculate Suspension ’s Excitation to Bodywork. Calculate wind excitation using computational fluid dynamics. Exhaust noise and tire noise were measured experimentally. The SEA model is used to predict the noise outside the car. The noise outside the car is 1.41dB (A) higher than the actual measured value, and the error is 1.94%. The results show that the SEA model can be applied to the vehicle product development stage.