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通过有限元方法分析齿轮产生裂纹和断裂及销轨磨损的原因,并分别研究了直弧形和弧形优化后的齿轮齿型面的优化效果.分析了这两种优化方案在高速重载情况下轮齿的接触情况及不同型面的接触区域在轮齿啮合过程中的变化规律.计算结果显示,各位置中轮齿上的最大应力均位于轮齿的边缘处,在较大的接触应力作用下,轮齿边缘会产生裂纹并不断扩大,最终导致轮齿的断裂.对齿轮边缘进行圆弧倒角,可以改变最大应力的位置,并且最大Mises应力可降低20%以上,从而解决齿轮的轮齿断裂问题. 相似文献
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现代人力资源理论在高校办公室管理中的应用 总被引:1,自引:0,他引:1
在阐述以人为本的现代人力资源管理理论的基础上,对现代人力资源管理手段在高校办公室管理工作中的实施提出建议,指出高校应转变工作方式和管理理念,有效运用现代人力资源管理手段,拓宽思路,以人为本,提高管理绩效。 相似文献
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To predict the behavior of land subsidence due to groundwater withdrawal, a 3D numerical model is established. The model takes the confined aquifer and soft deposit of Ningbo into account. According to the pumping test data, changing regulations of groundwater level, and land subsidence during dewatering are analyzed. Comparison between the calculated value and measured value shows that the 3D model simulates the measured value fairly well. The future behavior of land subsidence during dewatering period provides the scientific basis for the construction of deep foundation. 相似文献
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Factors directly affecting the extraction rate of the piles pulled out by a vibratory pulling system are summarized and classified into five categories (excitation force, resistance, vibration amplitude, pile plumbness keeping, and slowing down at the later stage) from the mechanics and engineering practice. Field tests on steel sheet piles extracted by vibratory technique in different soil conditions are conducted to ascertain how these factors affect the extraction rate of a pile with regard to three major actors of vibratory pile pulling: the pile to be extracted, the selected pulling system, and the imposed soil conditions. The extraction rates of three different sheet pile types (having up to four different lengths) pulled out by two different vibratory pulling systems are documented. The piles with different lengths and types, pulled out with or without a clutch, have different extraction rates. The working parameters governing the vibratory hammer, such as excitation force and vibration amplitude, exert significant influences on the rate of pile extraction, especially in the early stages of up-lift process. The extraction rate of the piles driven in different soil conditions is uniform because different extraction resistances mainly refer to shaft friction. The properties of the pile-soil interface influence the extraction rate of the piles, and the extraction rate decreases with the time for which the piles have been buried in the earth. 相似文献
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