摘要
通过对比消声器传声损失的3种计算方法,发现基于三维数值计算的三点法是消声器性能预测的简便方法。在消声器扩张室直径和长度不变的情况下,分别采用三维有限元法和边界元法,对插入管长度变化的扩张式消声器声学特性进行了计算和分析。结果表明:有限元法和边界元法的计算结果都和试验值吻合良好,采用有限元法能节省大量计算时间,不过处理复杂结构消声器的有限元网格模型需要的劳动强度和时间要大些。消声器消声域的数量随插入管长度的增大而增多,而消声峰值频率降低,为消声器的设计优化提供了依据。
The three numerical methods used for calculating transmission loss of mufflers were com- pared firstly. It was found that three points method based on three-dimension numerical method is a Convenient method for predicting acoustic performance of mufflers. Transmission loss of the expansion mufflers when varying lengths of inserted ducts were computed by the finite element method （FEM） and the boundary element method （BEM） in the case of fixed diameter and length of expansion muffler. Results show that transmission loss based on FEM and BEM is in well agreement with the experimental data, more computing time can been saved by using FEM,but labors and time for handling the mesh model of the complicated muffler will be cost when using FEM, The number of attenuation domain increases with increase of the length of inserted ducts; however, the attenuation resonance frequencies reduce. The analytical results can provide a foundation for design and optimization of the mufflers.
出处
《内燃机工程》
EI
CAS
CSCD
北大核心
2008年第6期65-69,共5页
Chinese Internal Combustion Engine Engineering
基金
重庆市自然科学基金资助项目(CSTC
2006BA7013)
关键词
内燃机
插入管消声器
传声损失
三点法
IC engine
inserted ducts muffler
transmission loss
three points method
