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液压机械无级变速箱动态特性研究 总被引:1,自引:0,他引:1
《机械强度》2017,(1):14-19
分析液压机械无级变速箱的工作原理,研究一种适合水、旱两用大功率拖拉机的液压机械无级变速箱。依据水、旱两用拖拉机复杂的多工况作业要求设计液压机械无级变速箱方案,并基于Matlab软件平台,对该液压机械无级变速箱部分动态特性进行仿真分析。仿真结果表明配备本液压机械无级变速箱的水、旱两用大功率拖拉机能够满足在水田和旱田中边行驶边工作的要求,实现连续无级变速。 相似文献
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At present, the water-cooling simulation of the water-cooled magnetic coupler is based on the water-cooled motor and the hydraulic coupler, which cannot accurately characterize the temperature distribution of the rotating watercooled coupling of the coupler. Focusing on rotating water cooling radiating, the present paper proposes simulating the water cooling temperature field as well as the flow field through the method of combining fluid-solid coupled heat transfer and MRF(Multiphase Reference Frame). In addition, taking an 800 kW magnetic coupling as an example, the paper optimizes the shape, number, cooling water inlet speed? and so on? of the cooling channel. Considering factors such as the complete machine's temperature, and drag torque, it is proved that the cooling e ect is best when there are 36 involute curved channels and when the inlet speed is 3 m/s. Further, through experiments, the actual temperature values at six di erent positions when 50 kW and 70 kW thermal losses di er are measured. The measured values agree with the simulation results, proving the correctness of the proposed method. Further, data have been collected during the entire experimental procedure? and the variation in the coupling's temperature is analyzed in depth, with the objective of laying a foundation for the estimation of the inner temperature rise as well as for the optimization of the structural design. 相似文献
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电场与磁场对轴承寿命的影响 总被引:2,自引:0,他引:2
对滚动轴承中电蚀现象研究的进展与发展现状进行了论述,结合电场或磁场对轴承寿命的影响,从电蚀失效的机理、实验研究方法与理论分析方法及结果等方面进行了分析,针对电场或磁场环境中工作轴承的特点,提出了理论研究中有待解决的问题,指出这类轴承寿命试验研究的特点与进一步发展的方向。 相似文献
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《机械设计与制造》2015,(8)
对某钢厂300t钢水罐进行瞬态温度场分析,得到了罐壁上关键节点温度随时间变化曲线和罐壁厚度方向上温度分布图。根据冶金工业部发布的《炼钢安全规程》中规定:要定期检查钢水罐,耳轴磨损大于耳轴直径的10%时应按规定进行检修或报废。故针对钢水罐的关键受力部件耳轴未磨损与磨损其直径的10%两种情况分别分析,将温度场结果作为初始条件进行热应力分析,然后将两种情况下得到的应力场对比分析。结果表明:磨损后的耳轴局部应力场最大应力值达到96.6MPa,较未磨损时应力增幅达73%。耳轴磨损其直径的10%后继续使用会对生产安全产生影响,日常维护和使用中重点关注耳轴磨损,定期检查其磨损情况并及时修复,有助于延长钢水罐寿命。 相似文献
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考虑摩擦副接触应力场和冷却流场的湿式离合器温度场分析 总被引:1,自引:0,他引:1
温度对湿式离合器摩擦副的摩擦特性和热失效具有重要影响。为了获取湿式离合器温度场的分布规律,建立摩擦副接触应力分布有限元模型和摩擦片沟槽内冷却流场数值计算模型,获得了摩擦副接触应力随离合器接合油压的变化规律和冷却流场对流换热随离合器转速的变化规律。在此基础上,提出考虑离合器摩擦副接触应力分布时变特性和冷却流场分布时变特性的离合器温度场数值计算模型。将所建温度场模型的仿真结果与试验结果作对比,验证了所建温度场模型的正确性。通过计算获得了湿式离合器接合过程中不同钢片在半径和厚度方向的温度分布规律,揭示了摩擦副接触应力场和摩擦片沟槽内冷却流场对离合器温度场的影响规律。结果表明,在离合器摩擦副半径方向上,摩擦副的温度分布规律与接触应力分布规律相一致。而摩擦片沟槽内冷却流场的对流换热主要影响离合器同步阶段的温度分布。 相似文献
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Field Bus applications 总被引:1,自引:0,他引:1
Richard H. Caro 《ISA transactions》1989,28(4):65-70
The ISA-SP550 Field Bus draft standard offers new opportunities to configure multivendor systems for a variety of applications never before possible with distributed control systems. It is not yet clear how vendors will respond with new types of products, but users of process control equipment will be sure to benefit as the conventional functions of measurement, control, display, and actuations become interchangeable commodity products. Not only does the Field Bus draft standard normalize data communications at practical and cost-effective levels, but for the first time the functions of process control become defined with common terminology and interfaces. The mystery has been removed, freeing the user to concentrate on solving the process problems rather than the instrumentation problems. This paper presents the details of the process control applications layer standard so that users may begin to understand how to apply Field Bus solutions to common process control problems. 相似文献
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介绍了聚合物电磁动态成型加工的特点,推导出振动力场作用下简单剪切流动中聚合物熔体的速度、剪切速率和剪切应力的计算公式,通过对动态流场的理论计算与分析表明,振动力场对于提高聚合物成型加工的综合性能具有显著效果。 相似文献