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汽车底盘测功机计算机测控系统的研究与应用   总被引:2,自引:0,他引:2  
汽车底盘测功机是以工业控制计算机为核心的多功能测试系统,实现了不同工况、不同负荷下动力性能的连续测量,并且增加了燃油消耗的测量,采用自适应控制相结合的控制方案。本文介绍了该系统的硬件、软件、控制方式以及通过电涡流测功机加载来模拟汽车行驶阻力的方法。  相似文献
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以重型车燃油的排放贡献及经济性难以通过传统发动机台架真实反映出来为出发点,就重型车底盘测功机的测试原理展开分析,深入介绍了底盘测功机测试重型车燃油及排放的方法,进而为底盘测功机整体测试重型车提供可靠参考依据。  相似文献
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Experimental and theoretical methods were applied to find and understand the phenomenon of brake squeal noise of the Seoul Metro rolling stock on tracks. Generally, it is well known that brake squeal noise is strongly related to stick and slip between brake pad and disk. In most cases for rolling stock on tracks, trailer cars needed more particular attention through the tests, because they were the major sources of brake noise due to frictional braking. There are two types of rolling stocks in Seoul Metro: chopper and VVVF. Both types of rolling stocks for lines 1 and 3 in the Seoul Metro were used for experimental analyses. To study brake squeal noise under various braking conditions, dynamometer tests were performed at the S&T Brake, Co., which is one of major manufacturers of brake pads for rolling stock on tracks. For measuring brake squeal noise, acoustic tests were performed with a microphone in the Gunja depot. And modal tests for brake parts, which consisted of brake lining, brake lining pad, and back plates, were executed to obtain the natural frequencies related to the brake squeal noise. Also, modal tests of the whole brake assembly and lining block were performed at the heavy maintenance shop of the Gunja depot. The mode analysis using an ANSYS was simulated to determine the relations between the mechanisms of brake squeal noise. As the results of the tests and the simulations, it was found that specific natural frequencies of the brake parts affected squeal noise, and also, the reason to create squeal noise. Finally, improvements for reducing squeal noise were proposed, and applied to lines 2 and 3 at Seoul Metro rolling stock on tracks. This paper was recommended for publication in revised form by Associate Editor Yeon June Kang Seong Keol Kim received his B.S. in Mechanical Design and Production Engineering from Seoul National University, Korea, in 1986. He then received his M.S. and Ph.D. degrees from Seoul National University in 1988 and 1994, respectively. Dr. Kim is currently an Assistant Professor at the School of Mechanical Design and Automation Engineering at Seoul National University of Technology in Seoul, Korea. Also, he works as an Executive Director of R&BD division of Seoul Technopark. Dr. Kim’s research interests include reliability of Micro System Packaging and mechanical vibration.  相似文献
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动力总成的传动系统扭振问题一直是汽车噪声、振动和声振粗糙度(noise, vibration and harshness,简称NVH)领域研究的热点和难点,针对某型三缸机中型多用途汽车(multi-purpose vehicles,简称MPV)高挡位低转速加速时车内振动和噪声问题,基于半消声室转鼓客观测试试验,运用传递路径分析方法,建立了传动系路径激励的识别方法。针对该三缸机动力总成,建立六自由度三缸机传动系扭振集总参数动力学模型,利用Matlab-Simulink软件进行仿真分析,实现了传动系扭振的准确预测和传动系扭振关键参数的分析。研究发现,传动系扭振受到发动机燃烧扭矩、发动机转速、传动系转动惯量和扭转刚度的影响显著,提出的传动系扭振前期开发策略为整车NVH性能的开发奠定了基础。  相似文献
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