摘要
为更加真实地模拟驾驶室内声学环境和提高驾驶室内高频噪声的预测精度,将泄漏量应用到SEA建模中,建立了考虑泄漏量的商用车SEA模型。利用伯努利方程推导等效总泄漏面积,将等效总泄漏面积按各个泄漏点的贡献量比例进行分配并添加到模型中仿真。与未考虑泄漏的SEA模型对比,结果显示仿真精度提高,误差减小了1.5 dB(A)左右,与试验结果间的绝对误差在2 dB(A)以内,满足工程上在汽车产品开发设计阶段对车内高频噪声分析预测的要求,从而验证了考虑泄漏量的SEA模型的有效性。在不同泄漏值下对驾驶室内噪声进行仿真计算,得到泄漏量对噪声值影响曲线。结合影响曲线和其他多方面因素,确定了合适的泄漏值为150 SCFM。对主要泄漏点开展有针对性的优化整改,气密性由整改前的268.5降到了149.1 SCFM。对优化整改后的驾驶室内噪声进行测量,结果显示,相比于优化前噪声值在两个工况下分别降低了1.82和1.31 dB(A)。
In order to simulate the acoustic environment in the cab more truly and improve the interior noise prediction accuracy,the leakage is applied to SEA modeling and a commercial vehicle SEA model considering leakage is established.Bernoulli equation is used to derive the equivalent leakage area.The equivalent total leakage area is divided by the leakage contribution and added to the model for simulation.In contrast with the SEA model without considering leakage,the results show that the simulation accuracy is improved and the error is reduced by about 1.5 dB(A)with the absolute error less than 2 dB(A),which meets the engineering requirement of high frequency noise analysis and prediction in vehicle product development and design stage.The SEA model considering leakage is fully validated.Under different leakage values,the interior noise is simulated and the curve of effect of leakage on the noise value is obtained.Combined with the influence curve and many other factors,the suitable leakage value of 150 SCFM is determined.The main leakage points are targeted for optimization and the leakage value drops from 268.5 to 149.1 SCFM.The interior noise after optimization is measured and the results show that the noise values are reduced by 1.82 and 1.31 dB(A)respectively under two working conditions compared with those before optimization.
作者
唐荣江
童浙
郑伟光
李申芳
黄莉
Tang Rongjiang;Tong Zhe;Zheng Weiguang;Li Shenfang;Huang Li(School of Mechanical&Electrical Engineering,Guilin University of Electronic Technology,Guilin 541000;R&D Center of Commercial Vehicle,Dong Feng Liuzhou Automobile Co.,Ltd.,Liuzhou 545005)
出处
《汽车工程》
EI
CSCD
北大核心
2019年第11期1327-1334,共8页
Automotive Engineering
基金
广西青年科学基金项目(2018GXNSFBA281012)
广西中青年教师基础能力提升项目(2018KY0205)
广西制造系统与先进制造技术重点实验室主任基金(17-259-05-010Z)
柳州市科学研究与计划开发项目(2018AA20301)资助
关键词
车内噪声
统计能量分析
泄漏量
等效泄漏面积
interior noise
statistical energy analysis
leakage
equivalent leakage area
