共查询到20条相似文献,搜索用时 140 毫秒
1.
2.
进气系统噪声是汽车的主要噪声源之一,它直接影响着车内噪声和通过噪声,从而影响着驾乘人员的驾乘感受和能否满足通过噪声的法规要求。空气滤清器作为进气系统的关键零部件之一,它不仅仅起到保护发动机的能力,还具备着降低进气系统噪声的能力。空滤的壳体模态直接影响着进气系统的辐射噪声,提高空滤的壳体模态,可以降低噪声,也可以避免空滤壳体的损坏,而影响空滤模态的因素主要为材料的杨氏模量、泊松比和密度,而三个因素是如何影响空滤的模态就需要通过仿真分析进行验证。文章通过Hyper mesh和ABAQUS软件进行空滤壳体模态联合仿真分析,验证各个因素对其的影响。 相似文献
3.
4.
5.
正进气系统的阻力和声学是一对矛盾,顾此失彼都难以做到性能与成本的最优,是进气系统开发过程中的难点所在。本文详细阐述了在进气系统开发中,如何进行两者之间的合理平衡。针对不同的开发模式、开发阶段,提出了如何定义管道直径的方法,给出了流体设计的基本理念,以有效指导进气系统的初期开发工作。进气系统发动机进气系统主要包含进气引气管(脏管)、空气滤清器(以下简称"空滤器")、过滤后管路(干净管)、波纹管、消声器结构以及相应的固定连接小部件等。相较于自然吸气型发动机,增压发动机的进气系统通常设计有宽频消声器结构。跨入本世纪前,进气系统的开发主要关注其流动特性以及空滤器的过滤性能,以实现发动机优化 相似文献
6.
7.
摩托车空气滤清器性能检测方法探讨 总被引:1,自引:0,他引:1
空气滤清器(下简称空滤器)是摩托车发动机进气系统的重要部件,主要是滤去空气中的灰尘、杂物和水份,以减少发动机气缸、活塞、曲轴等运动部件的磨损及防止化油器孔道堵塞,部分空滤器还兼有进气消声作用。空滤器既是性能部件又是功能部件,尤其是滤清效率、通气阻力等性能参数直接影响发动机的动力性、燃油经济性、使用可靠性和耐久性等。很多整车厂和专业厂对空滤器各项检测试验数据不够重视, 相似文献
8.
9.
10.
应用流体分析软件Fluent和发动机模拟软件GT-Power分别对某型号空滤器进气系统的气动性能和消声性能进行了模拟计算。分别研究了进出气管的管径大小和插入长度对空滤器进气系统的气动性能和消声性能的影响。研究结果表明,减小空滤器的进出气管直径均能改善空气滤清器进气系统的消声性能,但其气动性能有所恶化,而且通过比较发现,进气管的管径大小比出气管对空滤器的气动性能和消声性能影响更大;进出气管的插入对于此种结构的空滤器进气系统的气动和消声性能并无改善。文章最后根据空滤器消声性能的不足和发动机进气口的阶次噪声曲线,设计了一个谐振腔,改善了其噪声性能。 相似文献
11.
12.
13.
汽车发动机双时无负荷测功仪是为适应当前汽车修保体制向着定项检测,视情合理的方向发展而研制的一种不解体检测发动机动力性能与磨损状况的仪器,其测量结果是科学评判发动机修保质量的有效指标和诊断发动机故障的可靠依据,可广泛用应用于汽车运输,修理行业和科研部门,对该项目的研制技术背景,理论方法,仪器的电路原理及现场实验等方面进行了详细地论述。 相似文献
14.
Recently, as climate changes have manifested worldwide, every country is making efforts to prevent ozone depletion and global
warming. In the automotive industry, R-134a refrigerant is widely used in air conditioning systems because it has zero ozone
depletion potential (ODP). Unfortunately, its global warming potential (GWP) is high. Therefore, alternative refrigerants
are needed as a replacement for R-134a. R-152a is considered to be one of the better alternative refrigerants due to zero
ODP and low GWP. In this paper, the performance of an automotive air conditioning system using R-134a and one using R-152a
are compared experimentally at the bench level. The experimental apparatus simulated a real automotive air conditioning system
consisting of a cabin and engine room structure. The cooling capacity, condensing capacity, coefficient of performance (COP)
and power consumption characteristics of the automotive air conditioning system are evaluated by changing the air velocity
entering the condenser and the compressor rotation speed with the optimized refrigerant charge amount. Also, the performance
of the R-152a system was investigated by changing the thermostatic expansion valve which is set of values. The results of
this study show that the R-152a system is slightly better than the R-134a system, not only under driving conditions but also
under idling condition. R-152a refrigerant thus shows promise as an alternative refrigerant to replace the current standard,
R-134a, in automotive air conditioning systems. 相似文献
15.
16.
17.
利用汽车故障模拟台的控制开关通断来模拟节气门位置传感器信号的有无,同时测量与发动机性能和排放等有关的参数,进而分析该传感器某些功能失效对发动机的影响,正确地检测出发动机的故障。 相似文献
18.
K. -B. Kim K. -W. Choi K. -H. Lee 《International Journal of Automotive Technology》2012,13(3):401-407
A relatively new approach for improving fuel economy and automotive engine performance involves the use of automotive combined
cycle generation technologies. The combined cycle generation, a process widely used in existing power plants, has become a
viable option for automotive applications due to advances in materials science, nanotechnology, and MEMS (Mico-Electro Mechanical
Systems) devices. The waste heat generated from automotive engine exhaust and coolant is a feasible heat source for a combined
cycle generation system, which is basically a Rankine cycle in the context of this study. However, there are still numerous
technical issues that need to be solved before the technology can be implemented in automobiles. A simulation was performed
to examine the amount of waste energy that could be recovered through the use of a combined cycle system. A simulation model
of the Rankine cycle was developed using Cycle-Tempo software. The simulation model was ultimately used to evaluate the rate
of waste heat recovery and the consequential increase in the overall thermal efficiency of the engine with the combined cycle
generation system under typical engine operating conditions. The most effective automotive combined cycle system recovered
68% of the waste heat from the exhaust and coolant, resulting in a 6% improvement in engine efficiency. The results are expected
to be beneficial for evaluating the feasibility of combined cycle generation systems in automotive applications. 相似文献
19.
车用柴油机排气微粒分流式稀释取样测量系统的研制 总被引:10,自引:1,他引:10
本文设计了一种测量车用柴油机排气微粒的分流式稀释取样系统并制出了实验样品。文中说明了系统的布置和主要参数。重点是用CO2示踪法标定了不同发动机工部下的稀释比。用该系统测量一台车用柴油机的排气微粒结果表明该系统效果好,很实用。 相似文献
20.
本文将介绍上海汽车集团股份有限公司在学习国外先进物流管理理论基础上,结合企业产品特点,形成汽车发动机生产线物流管理的思路和实施方法,供有关方面参考。 相似文献