共查询到20条相似文献,搜索用时 156 毫秒
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消声器的研究与试验方法 总被引:2,自引:0,他引:2
在介绍消声器理论和计算方法的基础上,着重说明了消声器设计存在的问题,并指出消声器试验对消声器研究及设计的重要意义,最后还系统地介绍了国内消声器试验的一般情况和一些典型的试验内容。 相似文献
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四冲程摩托车的排气消声器内孔表面在使用过程中,由于基体金属与周围介质发生化学反应(主要是电化学反应)会逐渐腐蚀,严重的会阻塞排气消声器的内孔,穿透排气消声器的外皮,而影响排气消声器的性能;采用耐热防腐蚀涂料,对排气消声器内孔表面进行处理,防腐蚀效果良好。 相似文献
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EQ140汽车消声器的失效原因分析与改进方向的探讨 总被引:1,自引:0,他引:1
叙述了国内与国外发达国家消声器设计与制造上的差距,对EQ140汽车消声器进行了解解分析,找出了导致消声器失效的主要原因,并指出了以后改进方向以及加速开发消声器的重要性。 相似文献
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本文两次利用正交方法对汽车的排气消声器进行优化设计,弄清了不同参数对消声器的影响程序变化规律,通过正交设计,使新消声器的各项指标得到了提高。为消声器的设计提供了试验研究方法。 相似文献
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一、消声器放炮 消声器放炮是未燃烧完的可燃混合气在消声器内重新燃烧发出的爆炸声,常伴有火星冒出,俗称放炮。消声器放炮会导致发动机工作温度过高、加速性能差和行驶无力,其原因通常有以下几种。 相似文献
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采用汽车排气消声器是最主要、最有效、最简单的降低排气噪声的方法。目前,我国对汽车消声器的结构设计仅停留在经验设计或借鉴成熟设计的水平上,满足不了愈来愈严格的汽车排放法规对排气消声器的要求。本文就排气消声器结构设计、噪声的计算方法及其最新的设计发展方向等进行了阐述,并在此基础上提出了排气消声器优化设计的原则,探讨了声学在排气消声器结构设计中的应用。 相似文献
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通过对TCM叉车消声器的消声量测试,得知共对中高频段噪声消声效果不好。对该消声器进行结构参数分析,并在改进设计中增大了消声器容积比和改进排气尾管结构形式。改进后的消声器经装车试验,表明改进是成功的。 相似文献
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郑郧 《中国汽车保修设备》2000,(3):20-25
两次使用正交设计方法对汽车的排气消声器进行优化设计,找出了不同参数对消声器性能的影响程度和变化规律,使新消声器的各项指标得到了提高。为消声器的改进提供了试验研究方法。 相似文献
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摩托车消声器是一种允许气流通过而衰减噪声的装置,它是摩托车上的重要零部件之一,也是摩托车零部件中极易发生损坏的部件之一。消声器性能的好坏不仅影响摩托车噪声的大小.而且对发动机的功率、油耗、扭矩等性能都有较大的影响,因此,我们在市场上购买摩托车消声器的时候,一定要了解一些挑选它的相关注意事项.以便选出优质的消声器.从而减小摩托车的噪声.延长发动机的使用寿命。本期我们将劣质消声器同MSC标识部件的消声器作对比, 相似文献
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复杂汽车消声器内部流场数值模拟 总被引:2,自引:0,他引:2
汽车消声器是降低排气噪声的主要装置。近年来随着汽车工业的发展,国际上已经开始对汽车的各个零部件分别加以优化设计,其中利用计算流体力学对消声器的流场进行模拟是消声器设计的一个新动向。但是,对于比较复杂的消声器其内部流场复杂,计算量大,计算往往费时过多。本文利用并行计算机群,克服了硬件的困难,用计算流体力学对一复杂消声器内部流场进行了模拟。消声器以穿孔管为主要内件,共有2080个小孔。模拟结果清楚地反映了孔喷射和腔内涡流等流动现象,计算了多个工况,得到进口流速和背压关系。本文计算结果对消声器的设计有指导意义。 相似文献
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This paper focuses on the mechanisms of combustion noise during the accelerating operation of multi-cylinder diesel engines
using testing technology for the transient conditions of IC engines. Based on impact factors, such as the gas dynamic load
and cylinder pressure oscillations, tests and analysis of the combustion noise during transient and steady-state conditions
for different loads are made on four-cylinder naturally aspirated engines, turbocharged engines, EGR-introduced engines, and
high pressure common rail engines. The laws of combustion noise difference for the same engine speed and load are researched
during transient and steady-state conditions. It is found that during transient conditions, the maximum pressure rise rate
and the high frequency oscillation amplitude of the cylinder pressure are all higher than those observed during steadystate
conditions for the same engine speed and load. With their joint action, the combustion noise during transient conditions is
greater than that during steady-state conditions. Turbocharging is useful in reducing the combustion noise during transient
conditions. Turbocharging has a better effect on the control over the combustion noise during transient conditions with a
constant engine speed and an increasing torque than in conditions with a constant torque and an increasing engine speed. One
of the main reasons for different control effects on the combustion noise is that turbocharging causes different wall temperatures
inside combustion chambers. The introduction of the appropriate EGR is helpful in the reduction of the combustion noise during
transient conditions. The key to the control of combustion noise with EGR during transient conditions is whether a real-time
adjustment to the EGR rate can be made to achieve the optimization of the EGR rates for different transient conditions. By
means of analyzing the differences in the combustion noise between the transient and steady-state conditions for different
pilot injection controls, we obtain a strategy for controlling the combustion noise during transient conditions with a pilot
injection. Compared with the steady-state conditions, a larger pilot injection quantity and a longer interval between the
main injection and pilot injection should be selected for transient conditions, and this is verified through tests. 相似文献
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Using multiple regression analysis to estimate the contributions of engine-radiated noise components
《JSAE Review》1999,20(3):363-368
The respective contributions of combustion noise, mechanical noise, load-dependent noise and other engine noise components must be identified in order to devise effective measures for reducing diesel engine noise under full load operation. This paper describes a method for estimating the contributions of engine noise components using multiple regression analysis. With this method, the engine noise level is regarded as a criterion variable and the cylinder pressure level and engine torque as explanatory variables. The accuracy of this method has been confirmed by comparing the results with experimental data. Some examples of its application are also presented. 相似文献
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《JSAE Review》2001,22(1):57-62
As automobiles become quieter, the noise of wiper blade rubber in motion may become a problem for passengers. To resolve this noise, especially the squeal noise, we constructed an equation of motion for the wiper blade vibration by observation and FEM stress analysis. Based on the derived equation, we discovered several important design and material items which can be utilized to reduce squeal noise. 相似文献