摘要
为提高往复泵的设计水平,基于三柱塞单作用往复泵曲轴实例,通过将曲轴所受各力按相应坐标系分解,并将周期性作用力在时间相离散以及划分为若干计算断面,建立了曲轴疲劳可靠性分析模型。利用已开发的往复泵曲轴强度计算与校核软件计算并导出数据,应用半径矢量法分别求出曲轴各断面应力与疲劳极限的均值及标准偏差,使用联接方程求出各断面的联结系数,详细分析了曲轴模型的疲劳可靠性。通过对一系列实际使用效果良好和失效曲轴的疲劳可靠度进行计算与分析,得出了三柱塞单作用往复泵曲轴疲劳可靠度的合理取值;对于原可靠度过高的曲轴,反求出该曲轴实际能安全可靠承受的最大柱塞力,充分利用原机组的富余能力。往复泵曲轴疲劳可靠性分析具有重要的理论和实际应用价值。
Based on the example of crankshafts of three-plunger single-acting reciprocating pumps, analytic model for fatigue reliability of crankshaft is built by decomposing forces on it following the corresponding coordinate system, dispersing the periodic stress, and determining the computing cross-section. Data are derived by using the developed strength computation and verification software for reciprocating pump crankshaft and the fatigue reliability of crankshaft model is analyzed in detail by using the radius vector method. By the method, the fatigue reliability of a series of failed crankshafts and those with good actual use effect is computed and analyzed and reasonable value for fatigue reliability of crankshaft of three-plunger single-acting reciprocating pump is obtained. And the max plunger force that crankshaft can work safely and reliably is also calculated and applied to some crankshafts with too high original reliability, which make full use of the surplus capacity of the original reciprocating pump unit. Fatigue reliability analysis of reciprocating pump crankshaft has significant theoretical and practical application value.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2008年第10期272-276,共5页
Journal of Mechanical Engineering
基金
江苏省高技术研究资助项目(BG2006024)。
关键词
往复泵
曲轴
疲劳可靠性
疲劳极限
可靠度
Reciprocating pump Crankshaft Fatigue reliability Fatigue limit Reliability
