再制造抽油杆纵向共振模糊可靠性分析

发布时间：2018-05-11 00:13

本文选题：再制造抽油杆 + 模糊可靠性　；参考：《石油学报》2017年04期

【摘要】：针对再制造抽油杆设计参数的离散性和共振准则的模糊性,所导致的再制造抽油杆疲劳强度设计偏于危险的缺陷,将模糊可靠性理论引入再制造抽油杆疲劳强度设计中,根据再制造抽油杆实际工况,从实验出发,研究再制造抽油杆弹性变形应力刚化对其振动特性的影响,并以实验为基础,建立并验证再制造抽油杆纵向振动数值模型;基于随机有限元理论,采用一次二阶矩法推导了再制造抽油杆固有频率的均值及方差;利用正态型隶属函数描述再制造抽油杆共振边界的模糊性,推导了具有多阶固有频率再制造抽油杆模糊可靠度计算公式,数值算例验证了该方法的有效性和可行性。在此基础上,研究了变异系数和隶属度对再制造抽油杆振动模糊可靠度的影响,分析了不同阻尼比下再制造抽油杆共振产生的悬点处附加动反力和纵向位移响应特性曲线,为再制造抽油杆合理疲劳强度设计提供理论基础。
[Abstract]:Aiming at the discreteness of design parameters and the fuzziness of resonance criterion, the fatigue strength design of remanufacturing sucker rod is more dangerous, so the fuzzy reliability theory is introduced into the fatigue strength design of remanufacturing sucker rod. According to the actual working conditions of the remanufacturing sucker rod, the effect of elastic deformation stress stiffening on the vibration characteristics of the remanufacturing sucker rod is studied. Based on the experiment, a numerical model of longitudinal vibration of the remanufacturing sucker rod is established and verified. Based on the stochastic finite element theory, the mean and variance of the natural frequency of the remanufactured sucker rod are derived by using the first-order second-order moment method, and the fuzziness of the resonance boundary of the remanufacturing sucker rod is described by using the normal membership function. The calculation formula of fuzzy reliability of sucker rod with multi-order natural frequency is derived. Numerical examples show that the method is effective and feasible. On this basis, the influence of variation coefficient and membership degree on vibration fuzzy reliability of remanufacturing sucker rod is studied, and the characteristic curves of additional dynamic reaction force and longitudinal displacement response at the suspension point caused by resonance of remanufacturing sucker rod under different damping ratio are analyzed. It provides a theoretical basis for rational fatigue strength design of sucker rod.
【作者单位】：东北石油大学机械科学与工程学院;
【基金】：国家自然科学基金项目(No.11502051)“采油螺杆泵漏失机理的刚柔螺旋曲面与液膜多场耦合研究”资助
【分类号】：TE933.2

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