某拖拉机驾驶室声学特性分析与改进

为了降低拖拉机驾驶室内中高频噪声,建立基于统计能量分析(SEA)方法的驾驶室内噪声预测模型。通过理论计算和试验方法确定模型的基本参数和激励输入,通过仿真与试验对比验证了SEA模型的准确性。最后对驾驶室内声腔的功率输入分析,得到对驾驶室内噪声贡献较大的板件子系统,据此提出有针对性的声学包装改进方案,仿真结果表明该声学包装设计方案可以有效降低驾驶室内中高频噪声,总声压级降低1.87 d B(A),为拖拉机驾驶室内噪声控制及声学包装优化提供有效依据。

Analysis and Improvement for Acoustic Performance of a Tractor Cab

A prediction model of tractor cabin was established based on statistical energy analysis (SEA) method in order to decrease the middle and high frequency noise of the interior sound cavity . The basic parameters ,such as modal density, damping loss factor and coupling loss factor were calculated. The input of the vibration and noise excitation were measured. The validity of the SEA model was verified by comparing the test results with the simulation data. The subsystems that contribute mainly to the cabin noise were obtained by analyzing the power input to inner cavity. Based on that, the improvement cases of sound package were advised definitely. The simulation optimal results showed that the mid-high frequency noise of the tractor cabin was reduced effectively by using the sound package design treatments. The paper provides the effective reference for noise control and sound package optimization of the tractor cabin.