曹蕾,武永顶,庄海飞,夏铭,王文魁
CAO Lei,WU Yongding,ZHUANG Haifei,XIA Ming,WANG Wenkui

• 1:中交疏浚技术装备国家工程研究中心有限公司
• 2:清华大学

摘要(Abstract)：

针对泵轴强度传统校核方法与经验公式不能反映泵轴动态力学特性的问题,应用应变测量技术,得到了小流量、设计流量、大流量3个工况下泵轴危险截面附近弯曲应力、剪切应力、拉应力的实测瞬态数据。结果表明,剪切应力与拉应力随时间脉动幅度较小,峰峰值约为相应时均值的20%;而弯曲应力脉动峰峰值大于相应工况下其他两类应力时均值的2倍,且存在正负方向的交变,是诱发疲劳破坏的主因。弯曲应力的脉动主要来源于叶轮水力径向力随叶轮旋转的周期性变化,脉动主频为1倍转频。小流量工况下泵轴安全系数较小,应是强度校核工作的重点关注工况。
In view of the fact that conventional shaft strength check method and empirical formula cannot reflect the dynamic mechanical characteristics of the shaft,strain measurement was conducted in this research,and the measured transient bending stress,shear stress and pulling stress around the risk section of the shaft under three working conditions,i.e.,small flow,design flow and large flow were obtained.The results indicate that shear stress and pulling stress fluctuate slightly by about 20% of the corresponding timeaveraged value,while bending stress has a much larger fluctuation,more than 2 times of the time-averaged value of the other two types of stresses in the corresponding condition,with the direction of the bending stress periodically alternating,which is the main cause for inducing fatigue damage.The fluctuation of bending stress is mainly induced by the periodical variation of hydraulic radial force with the rotation of impeller and the dominant frequency is equal to the shaft rotational frequency.The safety factor of pump shaft is smaller under small flow condition,which should be paid close attention to during the stage of shaft strength check.

关键词(KeyWords)： 泵轴;强度校核;应变测量;动态特性;试验研究
pump shaft;strength check;strain measurement;dynamic characteristics;experimental investigation

Abstract:

Keywords:

基金项目(Foundation): 2018年度交通运输行业重点科技项目（2018-MS1-026）

作者(Author): 曹蕾,武永顶,庄海飞,夏铭,王文魁
CAO Lei,WU Yongding,ZHUANG Haifei,XIA Ming,WANG Wenkui

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