【摘要】 为确认影响拖拉机驾驶员耳旁噪声的主要振动模态,建立了拖拉机驾驶室声场中声压值与结构模态及模态声学贡献度数值的计算模型.利用驾驶室声-固耦合有限元模型进行仿真,分析了驾驶员耳旁噪声各频段峰值处的各阶模态贡献度值,并确认了峰值处的主导振动模态;利用主导振动模态来指导驾驶室主要振动模态的整改,且对主要模态整改前后驾驶员耳旁噪声声压级进行了对比.结果表明:驾驶室主要模态的改进可明显降低驾驶员耳旁噪声信号峰值,且峰值所在频段内的声压级也有所降低,可以实现分频段控制噪声,有效降低噪声.更多还原

【Abstract】 To recognize the effect of major vibration models on the ear-side noise level of tractor driver,the calculation model among sound pressure in cab sound field,structural model and acoustic modal contribution factors was established. Based on the structure-acoustic coupling finite element model of tractor cab,the simulation was conducted to analysis the modal acoustic contribution to the peak noise in different frequency bands,and the main vibration modes were obtained according to the contribution value. The main vibration models were rectified,and the sound pressure levels( SPLs) of pre and post rectification were compared. The results show that the improved main modes can significantly reduce the peak noise level and the SPL at tractor driver’ s ear-side in the frequency band,and the noise can be effectively controlled by dividing frequency band.更多还原