基于载荷识别的辅助变流器柜体振动模型修正
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摘要
为提高某地铁车辆辅助变流器柜体振动响应模拟结果的精度,提出一种结合动载荷识别与优化算法的振动模型修正方法。首先在辅助变流器柜体有限元模型的基础上,计算出载荷与响应之间的传递函数,并利用振动响应测试数据和传递函数计算出施加在各测点的载荷谱。然后采用序列二次规划算法对有限元模型进行模型修正,通过构造目标函数将多输出模型修正问题转化为单输出模型修正问题。最后,对修正后的有限元模型进行振动响应求解,分析结果与振动测试数据比较验证了模型修正方法的正确性。该方法可为进一步实现辅助变流器柜体的减振降噪创造必要条件。
In order to improve the accuracy of the results of vibration response simulation for a metro vehicle's auxiliary converter cabinet, a method of vibration model updating combining the load identification with optimization algorithm is proposed. Firstly, the transfer function between excitation and vibration response is calculated by means of the finite element model of the auxiliary converter cabinet, and the excitation spectrum applied at the measurement points of the auxiliary converter cabinet is calculated by using the transfer function and the test data. Then, sequence quadratic programming is adopted to carry out the model updating for the finite element model. The multi-output model updating problem can be transferred into a single-output model updating problem by constructing a proper objective function. Finally,the modified finite element model is analyzed and the vibration response results between numerical simulation and test are compared to verify the correctness of the proposed model updating method. The method can be used to create the necessary conditions for further vibration and noise reduction of the auxiliary converter cabinet.
In order to improve the accuracy of the results of vibration response simulation for a metro vehicle's auxiliary converter cabinet, a method of vibration model updating combining the load identification with optimization algorithm is proposed. Firstly, the transfer function between excitation and vibration response is calculated by means of the finite element model of the auxiliary converter cabinet, and the excitation spectrum applied at the measurement points of the auxiliary converter cabinet is calculated by using the transfer function and the test data. Then, sequence quadratic programming is adopted to carry out the model updating for the finite element model. The multi-output model updating problem can be transferred into a single-output model updating problem by constructing a proper objective function. Finally,the modified finite element model is analyzed and the vibration response results between numerical simulation and test are compared to verify the correctness of the proposed model updating method. The method can be used to create the necessary conditions for further vibration and noise reduction of the auxiliary converter cabinet.
引文
[1]张方,秦远田,邓吉宏.复杂分布动载荷识别技术研究[J].振动工程学报,2006,19(1):81-85.
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[5]毛玉明,郭杏林,赵岩,等.基于灵敏度分析的结构动态载荷识别研究[J].振动与冲击,2010,29(10):1-3.
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[8]宇振盛,张丽娜,秦毅.非线性优化问题的光滑化序列二次规划方法[J].上海理工大学学报,2015,37(4):317-321.
[9]刘崇茹.基于序列二次规划算法的多馈入直流输电系统功率优化[J].电网技术,2007,31(19):31-34+40.
[2]朱凼凼,冯咬齐,向树红.基于频率响应函数的动力学模型修正方法研究[J].中国工程科学,2005,7(8):89-94.
[3]芮强,王红岩,欧阳华江.机械结构动力学模型修正技术的现状与发展[J].装甲兵工程学院学报,2012,26(2):1-8.
[4]徐张明,高天明,沈荣瀛,等.一种改进的利用频响函数进行有限元模型修正的方法[J].振动与冲击,2002,21(3):43-45.
[5]毛玉明,郭杏林,赵岩,等.基于灵敏度分析的结构动态载荷识别研究[J].振动与冲击,2010,29(10):1-3.
[6]许立富.航天器虚拟振动试验模型修正软件开发[D].哈尔滨:哈尔滨工业大学,2010.
[7]徐菁,张方,姜金辉.计算参数对数值修正载荷识别算法的影响[J].南京航空航天大学学报,2016,48(1):143-148.
[8]宇振盛,张丽娜,秦毅.非线性优化问题的光滑化序列二次规划方法[J].上海理工大学学报,2015,37(4):317-321.
[9]刘崇茹.基于序列二次规划算法的多馈入直流输电系统功率优化[J].电网技术,2007,31(19):31-34+40.