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李旭
煤炭学报, 06/2019, Volume: 44, Issue: 6Journal Article
TD421.5; 为得到掘进机回转油缸的疲劳载荷谱,利用大容量数据记录仪(黑匣子)对回转油缸工作载荷进行测取,采用幅值门限法去除载荷数据中的异常峰值点,对测取的载荷进行预处理,得到经载荷平稳性和各态历经性检验的回转油缸拉动载荷样本数据.采用雨流计数法对回转油缸载荷样本数据进行统计处理,结合大量统计分析经验,对幅值和均值概率分布分别作威布尔分布和正态分布的假设,并对其幅值与均值的分布规律进行了研究,利用卡方检验,对幅值和均值的独立性进行检验,针对均值提出了三模态正态概率分布模型.结果 表明:在检验水平0.05的条件下,回转油缸拉动载荷的幅值和均值相互独立;幅值服从形状参数为1.156、尺度参数为3.345的威布尔分布;提出的三模态正态概率分布模型,真实反映出均值的统计特征,实现回转油缸载荷信息的准确识别.为保留回转油缸全寿命周期内的工作载荷特征以反映工程实际,根据回转油缸推拉工况作业时间比例,将回转油缸样本拉动载荷数据的累积频次扩展到5×105次循环,基于二维概率分布函数,建立了回转油缸拉动载荷数据8×8级幅均值二维载荷谱.根据疲劳累积损伤理论,应用Good-man方法将幅均值二维载荷谱转化为回转油缸拉动载荷数据8级一维载荷谱,可为回转油缸疲劳寿命预测及疲劳寿命试验提供理论基础.
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