摘要
提出了改进的响度理论,采用等效矩形频带代替特征频带以提升特定频段内的响度精度,并考虑了耳蜗的声传递函数以增强响度结果与人耳听觉的关联度.基于改进的理论提出了内燃机辐射噪声响度的仿真与优化流程,采用有限元法、柔性多体动力学理论和边界元法分别研究了4缸柴油机机体的模态、振动响应和结构辐射噪声,结合MATLAB编程得到噪声响度.完成了机体的结构优化,使其噪声响度在分析频域内得到了下降,并铸造了新机体.机体优化前后的柴油机台架试验结果显示,整机噪声响度也有明显下降,验证了响度理论和优化方案的可行性和有效性.
A modified loudness theory was proposed, which employed equivalent rectangular bandwidths instead of critical bands to enhance the loudness accuracy in a specific frequency range. The acoustic trans-fer function of the cochlea to increase the relevancy of the loudness results and human auditory sense was taken into account. Loudness simulation and optimization procedure for the internal combustion engine noise was proposed based on the modified theory. Finite element method, flexible multi-body dynamics theory and boundary element method were adopted to conduct the modal analysis, vibration response and structural radiated noise of the block of a four-cylinder diesel engine, respectively. Noise loudness was calculated with MATLAB program. The loudness in the interested frequency range decreases as block structure was optimized. The optimal block was cast for bench tests. Experimental results show that opti-mization can remarkably decrease engine noise loudness, and this validates the feasibility and effective-ness of the loudness theory and optimal scheme.
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
2014年第1期78-83,共6页
Transactions of Csice
基金
国际科技合作资助项目(2011DFA50901-9)
关键词
柴油机
响度仿真
响度优化
diesel engine
loudness simulation
loudness optimization
