共查询到19条相似文献,搜索用时 285 毫秒
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由于高速列车轴承造价昂贵、精度和可靠性要求极高等问题,在进行可靠性寿命试验时,只能做极小样本、短时间内的定时截尾寿命试验。为有效的对其进行可靠性评估,采用不完全混合Beta分布作为轴承累积失效概率的先验分布,结合多层Bayes可靠性评估方法,求解出极小样本无失效情况下的高速列车轴承可靠性数学模型。通过计算,在给定的可靠性指标要求下,所得结论符合实际情况,且采用不完全混合Beta分布作为先验信息的评估方法较传统Bayes方法具有明显的合理性。 相似文献
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随着我国经济水平的不断提高和综合国力的提升,动车事业得到了迅猛发展,推动了我国交通事业的发展,拉动区域经济,缩小贫富差距。目前,我国高速列车营运速度为330千米每小时,最高时速可达380千米,运营速度位居世界前列。高速列车引进中国后,在车下设备舱底板可靠性研究领域还不成熟,大多数设计师则凭借自身的设计经验对高速列车车下设备舱进行研究和探索,由于高速列车车下设备舱底板的零部件没有可靠的评估方式,只能对其进行寿命试验。基于此,本文对高速列车车下设备舱底板的可靠性进行深入的研究并分析了我国高速列车的现状。 相似文献
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滚动轴承的快速疲劳寿命试验及可靠性分析 总被引:1,自引:0,他引:1
介绍6308轴承的常规疲劳试验与加速疲劳试验,并根据试验结果和数据的多种方法处理,探索该型轴承疲劳失效的规律。在较大的P/C下,用较短的试验时间获得轴承的特征寿命值,来推断常规条件下的轴承特征寿命值,从而能有效地利用试验数据,分析轴承的可靠性。附图1幅,表3个,参考文献8篇。 相似文献
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通过台架试验的温升对比数据分析和分解检查,验证了铁路提速客车轴承设计的正确性,可完全满足我国铁路提速客车运用的需要,可以为装车试验做充分的准备。 相似文献
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用“正交试验法”优化滚锥轴承滚道粗超精工艺参数 总被引:2,自引:0,他引:2
高速铁路的发展,对与之配套的轴承提出了更高的要求,需进一步提高滚锥轴承的寿命,降低振动和噪声。通过采用“正交试验法”对滚锥轴承套圈滚道超精加工工艺参数进行试验研究,选择出滚锥轴承套圈滚道超精加工合理工艺参数,从而有效降低了滚锥轴承滚道表面粗糙度,提高了滚锥轴承滚道表面质量,取得了较好的效果。 相似文献
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开展了固体润滑轴承组件的真空加速寿命试验,以验证固体润滑轴承组件的设计是否满足在轨寿命要求。研究了MoS2基薄膜固体润滑轴承组件在小角度摆动情况下的寿命。试验采用4对轴承模拟在轨±6°连续往复摆动,通过检测轴承组件工作时的摩擦力矩、电机电流和轴承温升判断轴承运行状态。结果显示,寿命试验运行正常,累计摩擦次数为6.2×10~7次。寿命试验后对轴承进行了尺寸精度和旋转精度复测,然后对轴承组件进行了解剖分析。复测结果显示,轴承尺寸精度和旋转精度与试验前一致,轴承润滑状态良好。试验结果验证了固体润滑轴承组件寿命满足在轨任务要求,为其它空间相机小角度摆动的扫描机构固体润滑轴承组件的长寿命设计提供了依据。 相似文献
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Monte Carlo simulations combined with sudden death testing were used to compare resultant bearing lives to the calculated bearing life and the cumulative test time and calendar time relative to sequential and censored sequential testing. A total of 30,960 virtual 50-mm bore deep-groove ball bearings were evaluated in 33 different sudden death test configurations comprising 36, 72, and 144 bearings each. Variations in both life and Weibull slope were a function of the number of bearings failed independent of the test method used and not the total number of bearings tested. Variations in L 10 life as a function of number of bearings failed were similar to variations in life obtained from sequentially failed real bearings and from Monte Carlo (virtual) testing of entire populations. Reductions up to 40% in bearing test time and calendar time can be achieved by testing to failure or the L 50 life and terminating all testing when the last of the predetermined bearing failures has occurred. Sudden death testing is not a more efficient method to reduce bearing test time or calendar time when compared to censored sequential testing. 相似文献
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为在短时间内获得高频轻载自润滑关节轴承的寿命信息,通过增大载荷的方式建立了加速寿命试验模型,进行了2组恒定应力加速寿命试验。采用韦布尔分布对关节轴承寿命进行描述,并借助最小二乘法对韦布尔分布函数的2个参数进行估算,确定出关节轴承可靠性寿命的相关指标,最终计算出基准载荷下关节轴承的可靠性寿命。数据统计结果表明,关节轴承的寿命服从韦布尔分布,其加速模型符合逆幂律关系,从而验证了在不改变失效机理的前提下对高频轻载自润滑关节轴承进行载荷应力加速寿命试验的可行性,极大地提高了产品寿命的预测效率。 相似文献
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针对无轴泵喷轮毂布置式水润滑支撑/推力轴承的敞水自润滑结构,以桨叶做功后产生的高速高压流场为输入来设计轴承的润滑和冷却流动通道,形成一体化支撑/推力轴承的自循环润滑方案。鉴于桨叶水动力与轴承间隙流的耦合影响作用,提出了两者迭代的设计方法,建立了桨叶与轴承间隙水动力耦合计算模型,实现了无轴泵喷轴承间隙流量的定量计算与分析,完成了无轴泵喷推进器样机敞水试验和一体化水润滑轴承台架试验。在整个测试区间内,推力系数和轴承间隙流量计算值与测试值最大误差分别为6.2%和4.6%,验证了设计方法和计算模型的有效性与准确性。所提方法对无轴泵喷推进器水力性能的设计与优化具有重要的工程意义。 相似文献
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Joint bearings of attachments play a key role in the reliability of construction equipment. These joint bearings operate in very harsh environments with strongly varying dynamic impact loads and oscillating under low sliding speeds. The bearings therefore operate in boundary lubrication, which means that direct metal-to-metal contact inevitably renders the sleeve bearing highly prone to wear. The assessment of durability for sleeve bearings is carried out using a test bench with oscillatory motion. However, estimating a quantitative accelerated factor considering the actual operating conditions is limited. The aim of this work is to determine the experimental conditions of the accelerated life test and to analyze the quantitative accelerated factor considering the wear limits of bearings. The wear limits are determined by the analysis of dimensional management that simulates the dispersion of a bucket end position by using 3DCS dedicated software. The accelerated factor is obtained by the comparing the times required to reach the wear limits. This test duration is calculated by the prediction methodology of wear depth based on the correlation between wear rate and film parameter. After the wear tests are performed using a test bench with actual bearings, the wear depth is measured to verify the estimated bearings. The proposed methodology is useful to design an accelerated life test under periodically changed lubrication condition caused by oscillatory motion. 相似文献