共查询到20条相似文献,搜索用时 795 毫秒
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汽车净化消声器陶瓷蜂窝载体消声机理的理论及试验研究 总被引:1,自引:0,他引:1
基于多孔吸声材料的理论及声学传递矩阵理论,分析了目前广泛用于汽车净化消声器中的陶瓷蜂窝载体的消声机理,给出了其声学传递矩阵,并分析了影响声学性能的几个主要因素。对传声损失进行了模拟计算,计算结果与实例结果,基本一致。 相似文献
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降低摩托车排气噪声的试验研究 总被引:2,自引:0,他引:2
排气噪声是摩托车最主要噪声源之一,对某125摩托车进行了整车噪声评价声源识别、对其不带消声器而带空管的发动机排气噪声进行了频谱分析并对消声器消声性能做过改进试验和分析计算,结果表明,该摩托车主要噪声源仍为排气噪声;改进的 声 消声效果优于原消声器消声效果。 相似文献
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通过分析摩托车发动机进气噪声的产生机理,得出进气噪声的主要成分是低频空气动力性噪声。根据消声器设计的基本原理,对原空气滤清器的腔体及插入管进行了改进,通过计算机建立了三维模型并利用数值仿真分析技术对空气滤清器进行了仿真计算,得到改进前后的传递损失对比结果,验证了空气滤清器改进方案的可行性。 相似文献
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随着汽车产业的发展,以及客户满意度要求的不断提高,NVH已经成为评价汽车性能最重要的技术指标之一。文章介绍了汽车的NVH特性的意义,具体分析了A车型碳罐电磁阀电磁阀噪音传递到乘客舱的根本原因,并在不改变系统工作策略和标定的情况下,通过阻隔噪音的传播途径,解决了驾驶室内的噪音问题,大大提高了客户满意度。 相似文献
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J. -G. Ih C. -Y. Choi T. -K. Kim S. -H. Jang H. -J. Kim 《International Journal of Automotive Technology》2011,12(4):617-630
At the idle engine speed, the exhaust discharge noise is influenced by resonances in the whole system, which is composed of
connecting pipes and silencers. This pipe resonance radiates a high level of low frequency discharge noise, which is dominated
by the low order harmonics of the engine firing frequency. This low frequency noise deteriorates the vehicle’s interior noise
level and quality. The following study attempted to optimize the layout of an exhaust system to minimize low frequency noise
by changing the position of silencers and the lengths of inlet and outlet pipes in each silencer. After modeling the exhaust
system using four-pole parameters, the acoustical performance of the system was evaluated using the system insertion loss.
In the optimization, the virtual attenuation coefficient, which corresponds to the amount of attenuation coefficient required
for the silencers, was calculated to find a minimum value for the layout. The simulated annealing method, which is also known
as finding an optimal, was employed in searching for the optimized exhaust layout. Test examples of two cases, for two and
six design variables, were used. When the number of design variables was two, the positions of the center and rear silencers
were considered. When the number of design variables was six, the positions of the two silencers and the lengths of the inlet
and outlet pipes were considered. Three typical layouts for the exhaust system of each case were designed, including the given
system and an optimal system. By comparing the predicted and measured discharge noise level, it was confirmed that the optimized
exhaust layout has a higher noise reduction than the other layout designs. 相似文献
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针对某乘用车消声器在发动机转速1 500~3 000 r/min范围内尾管噪声偏大的问题,应用GT-Power软件建立发动机及排气系统模型,并对该模型进行了试验验证。应用DoE方法找到了对消声器性能影响较大的参数,建立了消声器性能综合评价体系。依据运行工况及指标的重要程度为各转速下的评价指标设计了相应的权重,通过多目标优化计算得到了最优化的消声器结构参数。优化后消声器的模拟计算结果表明,在发动机转速1 500~3 000 r/min范围内,尾管总噪声和2阶噪声有较大程度上的降低。 相似文献
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一种分析车内声传递特性的实验方法 总被引:2,自引:0,他引:2
以电-声传递测量替代声-声传递或振-声传递测量的方法来分析封闭腔室内的声传递特性,尝试用该方法对车内部件的声辐射传递特性进行了实验研究,结果表明该实验分析方法对于确定产生车内噪声的主要部件,研究车厢内的声特性十分有效,并具有物理概念明晰、实施简便的显著优点。 相似文献
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