摘要
阐述了模态密度的基本理论,给出了曲面曲率变化时模态密度的半经验计算公式。建立了某国产轿车的统计能量分析模型,计算了各简化子系统的模态密度,并采用FEA方法对车身各子系统的模态密度进行了计算,将简化子系统时计算的模态密度与FEA计算的模态密度进行了对比分析。分析预测了车速为100km/h时车内驾驶员耳旁噪声的1/3倍频程频谱,并将采用简化子系统计算模态密度时的车内噪声1/3倍频程频谱和采用FEA方法计算模态密度时的车内噪声1/3倍频程频谱分别与试验测量结果进行了对比,分析了各子系统模态密度的计算精度对车内噪声预测精度的影响。结果表明,准确获取车身各个子系统的模态密度可以有效地提高SEA模型预测精度,使车内噪声预测误差在1dB(A)以内,满足工程上在汽车产品开发设计阶段对车内中高频噪声分析预测的要求,可为汽车产品开发设计阶段的声学设计提供参考。
The fundamentals of the modal density was introduced,and a semi-empirical formula calculating the modal density when the surface curvature changes was deduced.A statistical energy analysis（SEA）model was built for a certain domestic car,and the modal densities of the simplified car subsystems were calculated.The modal density of each subsystem was also calculated with the finite element analysis（FEA）method.Both results were compared each other.The 1/3 octave band spectrums of the car interior driver ear-vicinity noise were predicted at speed 100 km/h by both the subsystem modal density calculation and the FEA calculation.Both results were compared with the test results.The effects of calculation precision of the subsystem modal density on the precision of car interior noise prediction were discussed.The results indicate that the car interior noise prediction precision by the SEA model can be improved effectively by enhancing the modal density calculation precision of the car subsystems,the predicted error of the car interior noise can be kept within 1 dB（A）.The model results satisfy the requirement on car interior medium-and high-frequency noise prediction at the car development phase,providing a reference for the car acoustic design.
出处
《吉林大学学报（工学版）》
EI
CAS
CSCD
北大核心
2010年第2期335-340,共6页
Journal of Jilin University:Engineering and Technology Edition
基金
“863”国家高技术研究发展计划项目(2006AA110102-3)
吉林省科技发展计划重点项目(20040332-1)
关键词
车辆工程
车内噪声
统计能量分析
模态密度
噪声预测
vehicle engineering
car interior noise
statistical energy analysis（SEA）
modal density
noise prediction
