商用车白车身焊点模拟对模态分析的影响研究
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摘要
针对商用车驾驶室有限元模态分析中如何选择点焊模拟方式来建立有限元模型这一问题,以某重型商用车驾驶室白车身为研究对象,分析了RBE2、CWELD和ACM等几种典型的焊点模拟方式对其模态分析的影响。首先,阐述有限元分析中3种焊点模拟的典型方法,并较详细地说明3种焊点模拟方法的特点,以此为基础建立某型商用车驾驶室白车身有限元模型并进行模态分析,得到该白车身驾驶室的模态特征,再利用DHDAS动态信号采集分析系统,采用单点激励法对该驾驶室白车身进行模态试验及模态参数识别,并通过对比分析讨论了3种焊点模拟方式的精度。结果表明,柔性单元模拟焊点比刚性单元模拟更为准确,CWELD和ACM两种柔性单元模拟结果误差在2.5%以内,具有等效模型精度。引用误差函数验证了CWELD单元模拟焊点的有限元模型的可靠性。研究结果可为有效提高商用车驾驶室有限元建模质量提供了焊点模拟方式的选择参考。
The effect of spot weld modeling on modal analysis was investigated for the finite element modal analysis of commercial vehicle cab by applying typical spot weld modeling methods( RBE2、CDELD,ACD) based on a commercial vehicle's body-in-white cab. Firstly,the characteristics of three typical methods of spot weld simulation methods in finite element analysis were described in detail. Based on this,the finite element model of the cab was built and the modal characteristics of the body-in-white cab were obtained. Furthermore,single point excitation method was adopted to test for for modal analysis and modal parameter identification of the body-in-white cab by using DHDAS dynamic signal acquisition and analysis system. By comparative analysis,the accuracy of threetypical spot weld simulation methods was discussed. The results show that the flexible element spot weld modeling is more accurate than rigid element spot weld modeling. Meanwhile,the two flexible spot modeling elements CWELD and ACM have the equivalent model precision with the error of the simulation less than 2. 5%. Finally, the viability of using CWELD in spot weld modeling is confirmed by the application of error function. These results provide options of spot weld modeling for improving the finite element modeling quality of Commercial vehicle cab effectively.
The effect of spot weld modeling on modal analysis was investigated for the finite element modal analysis of commercial vehicle cab by applying typical spot weld modeling methods( RBE2、CDELD,ACD) based on a commercial vehicle's body-in-white cab. Firstly,the characteristics of three typical methods of spot weld simulation methods in finite element analysis were described in detail. Based on this,the finite element model of the cab was built and the modal characteristics of the body-in-white cab were obtained. Furthermore,single point excitation method was adopted to test for for modal analysis and modal parameter identification of the body-in-white cab by using DHDAS dynamic signal acquisition and analysis system. By comparative analysis,the accuracy of threetypical spot weld simulation methods was discussed. The results show that the flexible element spot weld modeling is more accurate than rigid element spot weld modeling. Meanwhile,the two flexible spot modeling elements CWELD and ACM have the equivalent model precision with the error of the simulation less than 2. 5%. Finally, the viability of using CWELD in spot weld modeling is confirmed by the application of error function. These results provide options of spot weld modeling for improving the finite element modeling quality of Commercial vehicle cab effectively.
引文
[1]谢小平,韩旭,陈国栋,等.某商用车驾驶室白车身模态分析[J].湖南大学学报(自然科学版),2010,37(5):24-30.
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[4]孟凡亮,张林波,吴泽勋.焊点模拟方法对疲劳仿真寿命的影响[J].计算机辅助工程,2014,23(6):32-36.
[5]吕彭民,周小进,李大涛.电焊对钢桥细部焊接结构疲劳寿命的影响[J].广西大学学报(自然科学版),2015,40(2):257-263.
[6]吕毅宁,吕振华.焊点连接模型对结构刚度的有限元模拟精度的影响分析[J].工程力学,2009,26(10):171-176.
[7]PALMONELLA M,FRISWELL M I,MOTTERSHEAD J E.Finite element models of spot welds in structural dynamics:Review and updating[J].Computes and Structures,2005,83(3):648-661.
[8]王力.基于白车身模态分析的有限元焊点模型研究[D].广州:华南理工大学,2016.
[9]LIANG Jian-yong,LIANG Jun,FANG Guo-dong,et al.Evaluation on spot weld models in structural dynamic analysis of automotive body in white[J].Chinese Journal of Mechanical Engineering,2011,12(24):84-90.
[10]陈欣,王军,张光明.某商用车白车身模态分析及试验研究[J].重型汽车,2015,4(5):45-48.
[11]贺岩松,张军锋,张志飞,等.重型商用车驾驶室悬置系统参数匹配研究[J].2011,33(2):182-184.
[12]谢小平,姜彪,雷飞.实验模态分析快速计算方法与应用研究[J].振动与冲击,2015,34(24):46-51.
[13]马天飞,王登峰,刘文平.重型商用车驾驶室白车身的模态分析与实验研究[J].汽车工程,2009,31(7):616-619.
[14]韩阳,李洪力,朱延鹏.某轿车白车身模态有限元分析与试验研究[J].机械研究与应用,2015,28(3):105-108.
[2]MARINA A P.A review of experimental techniques for NVH analysis on a commercial vehicle[J].Energy Procedia,2015,82:1017-1023.
[3]宋海生,史文库,龙岩,等.整车模态分析中焊点模拟方法的研究[J].汽车工程,2011,33(11):920-923.
[4]孟凡亮,张林波,吴泽勋.焊点模拟方法对疲劳仿真寿命的影响[J].计算机辅助工程,2014,23(6):32-36.
[5]吕彭民,周小进,李大涛.电焊对钢桥细部焊接结构疲劳寿命的影响[J].广西大学学报(自然科学版),2015,40(2):257-263.
[6]吕毅宁,吕振华.焊点连接模型对结构刚度的有限元模拟精度的影响分析[J].工程力学,2009,26(10):171-176.
[7]PALMONELLA M,FRISWELL M I,MOTTERSHEAD J E.Finite element models of spot welds in structural dynamics:Review and updating[J].Computes and Structures,2005,83(3):648-661.
[8]王力.基于白车身模态分析的有限元焊点模型研究[D].广州:华南理工大学,2016.
[9]LIANG Jian-yong,LIANG Jun,FANG Guo-dong,et al.Evaluation on spot weld models in structural dynamic analysis of automotive body in white[J].Chinese Journal of Mechanical Engineering,2011,12(24):84-90.
[10]陈欣,王军,张光明.某商用车白车身模态分析及试验研究[J].重型汽车,2015,4(5):45-48.
[11]贺岩松,张军锋,张志飞,等.重型商用车驾驶室悬置系统参数匹配研究[J].2011,33(2):182-184.
[12]谢小平,姜彪,雷飞.实验模态分析快速计算方法与应用研究[J].振动与冲击,2015,34(24):46-51.
[13]马天飞,王登峰,刘文平.重型商用车驾驶室白车身的模态分析与实验研究[J].汽车工程,2009,31(7):616-619.
[14]韩阳,李洪力,朱延鹏.某轿车白车身模态有限元分析与试验研究[J].机械研究与应用,2015,28(3):105-108.