应用梯度连接层的层合电工钢梁螺栓结合部简化模型研究

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (5) : 67-74.

论文

关天赐，王小鹏，奚延辉

作者信息 +

Simplified model of bolted joint of laminated electrical steel beam using gradient connection layer

GUAN Tianci, WANG Xiaopeng, XI Yanhui

Author information +

文章历史 +

摘要

表征电工钢片间螺栓结合部连接参数是进行铁心结构动力学分析的关键，针对现有变压器铁心动力学模型参数识别误差大的问题，提出了考虑螺栓结合面压强分布不均匀的梯度连接层模型。通过理论计算获得了螺栓结合部的压强分布，推导了梯度连接层弹性参数与螺栓结合部接触压强的关系式。在获得层合电工钢梁试件等效材料参数的基础上，对由螺栓连接的两根相同层合电工钢梁，建立了梯度连接层模型模拟层合电工钢梁之间的螺栓结合部。经模态对比修正了梯度连接层的弹性参数，修正后螺栓连接层合电工钢梁实验模态与计算模态的前8阶振型一致，对应固有频率的误差在1%以内，证明了梯度连接层模型的准确性。在变压器铁心中应用修正后的梯度连接层模型，能够提高建模精度。

Abstract

Characterizing the connection parameters of the bolted joint between the electrical steel sheets is the key to the dynamic analysis of the core. Aiming at the problem of large error in parameter identification of transformer core dynamic model, a gradient connection layer model considering the pressure distribution of the bolted joint was proposed. The pressure distribution of the bolted joint was obtained through theoretical calculation, and the relationship between the elastic parameters of the gradient connection layer and the contact pressure of the bolted joint was derived. Based on the obtained equivalent material parameters of laminated electrical steel beams, a gradient connection layer model was established to simulate the bolted joint between two identical laminated electrical steel beams connected by bolts. The elastic parameters of the gradient connection layer were updated by comparing the experimental modals with calculated modals. The calculated modals’ first eight order vibration shapes of the laminated electrical steel beams connected by bolt are consistent with the experimental modals’ after updating, and the relative errors of the corresponding natural frequency are within 1%, which proves the accuracy of the gradient connection layer model. Applying the updated gradient connection layer model in transformer core can improve the modeling accuracy.

导出引用

关天赐，王小鹏，奚延辉. 应用梯度连接层的层合电工钢梁螺栓结合部简化模型研究[J]. 振动与冲击, 2022, 41(5): 67-74

GUAN Tianci, WANG Xiaopeng, XI Yanhui. Simplified model of bolted joint of laminated electrical steel beam using gradient connection layer[J]. Journal of Vibration and Shock, 2022, 41(5): 67-74

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