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本文运用频谱分析和相干函数理论,建立了识别拖拉机驾驶室内主噪声源的多输入单输出力学模型,利用自编程序计算了常相干函数、重相干函数和偏相干函数,并且通过实验分析,验证了力学模型的正确性,确定了驾驶室内主噪声源和主噪声传递通道。 实验分析表明,驾驶室内主噪声频率是发动机的燃烧基频,主噪声源是由驾驶室板件振动辐射出来的固体声,驾驶室的主激振源是发动机的振动。根据分析结果,对驾驶室采取了降噪措施,使驾驶员的耳旁噪声由96dB(A)降低到90.5dB(A)。
In this paper, a multi-input and single-output mechanical model for identifying the main noise source in a tractor cab is established by using spectrum analysis and coherence theory. The self-programming program is used to calculate the normal coherence function, the coherence function and the partial coherence function, and through experimental analysis and verification The correctness of the mechanical model has confirmed the main noise source and the main noise transmission channel in the cab. Experimental analysis shows that the main noise frequency in the driver’s cabin is the basic frequency of combustion of the engine. The main noise source is the solid sound radiated by the cab plate vibration. The main driving source of the cab is the vibration of the engine. Based on the results of the analysis, noise reduction measures were taken on the driver’s cab to reduce driver noise from 96 dB (A) to 90.5 dB (A).