共查询到18条相似文献,搜索用时 109 毫秒
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为解决由于现有汽车制动检测台的滚筒中心距固定导致滚筒式制动台对不同直径车轮的测试能力差别过大的问题,本文设计了汽车反力式可变滚筒轴距制动检测台,通过滚筒变轴距装置自动调整滚筒中心距并调整链轮张紧程度,使检测台对各种车型的最大检测能力相同,对不同车型制动力检测技术的发展具有重要意义。 相似文献
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电涡流缓速器是一种利用电磁场原理将汽车行驶的动能转化为热能散发掉,从而实现汽车减速和制动作用的辅助制动装置。在分析车用缓速器性能要求的基础上,提出了缓速器的底盘测功机模拟道路试验方法,并以电涡流缓速器为例介绍了试验过程,模拟了缓速器平路制动、恒速下坡试验,进行了速度-功率试验和拖磨试验。缓速器的底盘测功机试验方法克服了道路试验的缺点,是对缓速器台架试验方法的必要补充,有助于进一步研究和开发车用电涡流缓速器。 相似文献
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为做好无轨胶轮车制动性能检测工作,介绍了无轨胶轮车制动性能主要评价指标,分析了无轨胶轮车制动性能安全检测手段现存的不足,提出了采用高精度智能检测的策略,总结了具体检测要求,建议增加制动效能恒定性与制动方向稳定性评价指标,以期通过建立无轨胶轮车制动性能的常态化检测机制,充分做好无轨胶轮车制动性能的检测工作,进而有效降低无轨胶轮车制动安全隐患,更好地保障无轨胶轮车的安全稳定运行. 相似文献
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从检测工作的需要出发,提出了重型动力负荷车的设计目标,并从底盘车、测功机、加载传动系统选择等3个方面进行了总体方案设计。根据匹配分析,基本确定了满足设计需求的配置方案,为生产制造提供了技术依据。 相似文献
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针对肖家洼煤矿现有轻型胶轮车在运行过程中存在车辆排放超标、动力性不足等问题,搭建轻型胶轮车动力性检测系统检测线,该检测线具备排放检测、转速表校正、底盘最大输出功率检测几项内容,为维护保养提供科学可靠的技术支持,从而确保入井车辆的安全可靠。 相似文献
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汽车轮胎橡胶摩擦试验研究 总被引:9,自引:2,他引:9
介绍了所开发的轮胎橡胶摩擦试验台,提出了轮胎橡胶摩擦试验方法。在该试验台上进行了干水泥路面、冰面等工况下的轮胎橡胶块摩擦试验,对所得试验结果进行了分析、处理。初步掌握了路面、温度、垂直压力和滑移速度等因素对摩擦因数的影响。在此基础上把动摩擦的概念引入轮胎半经验模型,对现有模型进行了改进。提出了应用轮胎低速试验数据预测高速下轮胎特性的方法。 相似文献
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研究轮毂直驱电动车轮胎垂向刚度与滚阻特性相匹配问题,揭示轮毂直驱电动汽车非簧载质量负效应产生机理,提出利用胎压改变轮胎垂向刚度进而改善悬架特性的方法。设计出四组不同胎压的轮胎垂向刚度试验,并将轮胎实际垂向刚度应用到悬架特性分析上。结果表明,通过调节轮胎垂向刚度改变了悬架特性的二阶共振频率使其远离人体敏感振动频率,并在一定程度上抑制其振动幅值。为解决轮毂直驱电动汽车轮胎刚度与滚阻特性匹配问题,研究胎压对轮胎滚阻特性和能量损耗的影响,并对四组胎压的轮胎进行滚阻特性及滞回特性试验。试验结果表明,胎压对轮胎滚动阻力有很大影响,胎压升高,轮胎滚动阻力系数和能量损耗变小。进一步表明,胎压与轮胎滚阻系数的关系及能量损耗的关系两者之间基本是一致的,揭示了轮胎滚动阻力产生机理。因此,利用胎压调节轮胎垂向刚度抑制了电动汽车非簧载质量负效应,兼顾了胎压对轮胎滚阻及能耗的影响,实现了轮胎垂向刚度与滚阻特性的匹配,为轮胎与悬架的相互作用机理提供了理论依据。 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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The cause of the ICE train derailment, which occurred in 1998 at Eschede, was fatigue failure originating on the inside of the wheel tire. Rubber-sprung resilient wheels were used for the trailer cars. The wheel tire is mounted on the wheel disc. Thirty-four rubber pads were arranged between the wheel disc and the wheel tire. It was postulated that fretting fatigue between the rubber block and the inner side of the tire might have an influence on the initiation of the incipient crack. In order to clarify the influence of the rubber contact on the fatigue strength of the tire, fretting fatigue experiments under rubber contact conditions were performed. During the fundamental fretting fatigue test using bridge pads and small size carbon steel specimens, no typical fretting damage such as fretting wear and minute cracks were observed due to contact of the rubber. Stress conditions of the rubber-sprung wheel under vertical and lateral wheel loads were evaluated by a three-dimensional elastic stress analysis. Since the rubber is a super-elastic material, the Mooney-Rivlin model was used in the FEM calculation. It was found that the wheel tire is subjected to a cyclic stress during one revolution of the wheel and the maximum stress occurred at the center of the inner surface of the tire where the fatigue crack initiated. Fatigue strength of the wheel tire was determined by the rotating bending fatigue testing of specimens taken from the tire. It was found that the tire with an 862 mm diameter at a wheel load of 80 kN had a safety factor more than 3.5 from a fatigue limit diagram with a failure probability of 0.01. To confirm the fretting damage under the rubber contact and the result of the fatigue strength evaluation, fatigue tests of a full size wheel were made. After 20 million cycles at the wheel load of 280 kN, which was just below the endurance limit estimated by the endurance limit diagram, no fretting damage and no fatigue cracks were observed. The wheel was, however, fractured at 1.56 million cycles under the maximum load of 308 kN, which was just above the endurance limit. The estimation of the safety factor of 3.5 estimated from the endurance diagram was confirmed by the full size fatigue testing. It was concluded that there was no effect of fretting due to the rubber contact on the fatigue strength of the rubber-sprung single-ring railway wheel. 相似文献
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针对实际现状,设计了一套密封试验夹具,通过多组试验,研究了橡胶圈压量以及沟槽同轴度对装配的影响,得到了当密封直径为105mm左右,胶圈直径3.55mm时,胶圈预压量为0.15~0.22mm,沟槽直径同轴度要求不大于0.05mm时,能够很好地保证零件在气压、油压、冲洗等试验中对密封元件的要求,保证压量适中、密封无泄漏的要求。 相似文献