联合收获机脱粒滚筒模态分析与结构参数优化
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摘要
联合收获机在工作时会产生振动等,为避免联合收获机脱粒滚筒在工作时发生共振,利用Solid Works软件对雷沃RG50稻麦联合收获机的脱粒滚筒进行CAD参数化建模,利用ANSYS Workbench软件中的模态分析模块对脱粒滚筒进行模态分析,得到其固有频率与相应的振型图。为了验证有限元模型的可靠性,对联合收获机脱粒滚筒进行模态试验,结果表明:脱粒滚筒的固有频率与联合收割机的外部激励频率均不相同,故不会产生共振。为了降低制造成本,对脱粒滚筒的幅盘进行结构优化改进,并对其进行强度校核,最大应力为16MPa,远小于材料屈服极限。改良后的脱粒滚筒与改良前相比,滚筒的质量缩减了17%,满足了脱粒滚筒结构优化设计的目标。该研究结果为联合收获机脱粒滚筒结构优化提供了设计依据。
When combine harvesters work,there will be the problems of vibration and noise. Therefore,we need to avoid resonance when working with threshing roller. The parametric modeling of the combine harvester threshing roller was developed using the three-dimensional modeling software Solidworks. The modal frequency and vibration mode of the threshing cylinder were solved by ANSYS Workbench. Through the modal test of threshing roller,it was verified the accuracy of theoretical analysis and the reliability of the finite element model. Moreover,from the test results,the natural frequency of threshing cylinder was different from the external excitation frequency of combine harvester. So there was no resonance. In order to reduce the manufacturing cost,the structure of the threshing drum is optimized. Then we checked the strength stiffness. The maximum stress is 16 MPa,which is far less than the yield limit of the material. Compared with the improvement,the quality of the drum was reduced by 17%,and the optimization design of the threshing roller is achieved. The study provided some reference for the design and optimization of the combined harvester threshing cylinder.
When combine harvesters work,there will be the problems of vibration and noise. Therefore,we need to avoid resonance when working with threshing roller. The parametric modeling of the combine harvester threshing roller was developed using the three-dimensional modeling software Solidworks. The modal frequency and vibration mode of the threshing cylinder were solved by ANSYS Workbench. Through the modal test of threshing roller,it was verified the accuracy of theoretical analysis and the reliability of the finite element model. Moreover,from the test results,the natural frequency of threshing cylinder was different from the external excitation frequency of combine harvester. So there was no resonance. In order to reduce the manufacturing cost,the structure of the threshing drum is optimized. Then we checked the strength stiffness. The maximum stress is 16 MPa,which is far less than the yield limit of the material. Compared with the improvement,the quality of the drum was reduced by 17%,and the optimization design of the threshing roller is achieved. The study provided some reference for the design and optimization of the combined harvester threshing cylinder.
引文
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[14]姚艳春,宋正河,杜岳峰,等.玉米收获机割台振动特性及其主要影响因素分析[J].农业工程学报,2017,33(13):40-49.
[15]Fukushima T,Inoue E,Mitsuoka M,et al.Collision Vibration Characteristics with Interspace in Knife Driving System of Combine Harvester[J].Engineering in Agriculture,Environment and Food,2012,5(3):115-120.
[16]权龙哲,佟金,曾百功,等.玉米根茬收获系统的有限元模态分析与试验[J].农业工程学报,2011,27(11):15-20.
[17]许光辉,王安斌,宋月超,等.一种多层弹性部件轨道系统的动态特性试验研究[J].机械工程学报,2018,54(8):74-82.
[18]唐斌,刘广彬,许海平,等.大型工艺往复压缩机系统振动分析[J].中国机械工程,2014,25(7):873-877.
[19]杨景义.试验模态分析[M].北京:北京理工大学出版社,1990.
[20]俞云书.结构模态试验分析[M].北京:宇航出版社,2000.
[21]沃德·海伦,斯蒂芬·拉门兹,波尔·萨斯.模态分析理论与试验[M].北京:北京理工大学出版社,2001.
[22]周莉,李爱平,古志勇,等.基于实验模态分析的机床动态性能测试[J].中国工程机械学报,2014,12(4):360-363.
[23]李耀明,李有为,徐立章,等.联合收获机割台机架结构参数优化[J].农业工程学报,2014,30(18):30-37.
[24]王震虎,周巧英,刘开勇,等.基于响应面模型的白车身多目标轻量化设计[J].中国机械工程,2018,29(1):75-81.
[2]严帅,曹京生.基于ANSYS的滚筒轴优化设计[J].机械设计与制造工程,2014(1):42-45.
[3]徐中明,余烽,张志飞,等.小型机动平台车体动态特性分析与减振优化[J].机械设计,2011,28(3):84-87.
[4]申秀敏,刁金冬,李进,等.轿车车身顶棚的有限元模态分析[J].车辆与动力技术,2011(2):42-45.
[5]余启志,陈丹晔,陈燕.车身有限元与试验模态分析比较[J].东华大学学报:自然科学版,2011,37(4):493-496.
[6]张克鹏,邵林,吕景春,等.牵引车车架的模态分析[J].汽车实用技术,2012(1):35-39.
[7]李长林,王雪亮,金晓萍,等.高速插秧机底盘快速设计专家系统[J].农业机械学报,2012,43(S1):323-328.
[8]谢军海,张雪坤,张锋伟,等.基于Ansys Workbench的脱粒滚筒模态分析及轴的拓扑优化[J].甘肃农业大学学报,2016,51(6):134-138.
[9]Weston J,Zhang W.Equivalent parameterized beam model for nailed connections in low-rise residential buildings[J].Engineering Structures,2017,145(8):12-21.
[10]Zhu K,Qing X P,Liu B.A two-step impact localization method for composite structures with a parameterized laminate model[J].Composite Structures,2018,192(8):500-600.
[11]李燕,张秀丽,但强,等.4LZ-2.0型稻麦联合收获机割台框架有限元模态分析[J].农机化研究,2011,33(11):90-92.
[12]梁振伟,李耀明,赵湛.纵轴流联合收获机籽粒夹带损失监测方法及传感器研制[J].农业工程学报,2014,30(3):18-26.
[13]Zhang Bo,Shi Zhongke,Li Jianjun.Flight Flutter Modal Parameters Identification with Atmospheric Turbulence Excitation Based on Wavelet Transformation[J].Chinese Journal of Aeronautics,2007,20(5):394-401.
[14]姚艳春,宋正河,杜岳峰,等.玉米收获机割台振动特性及其主要影响因素分析[J].农业工程学报,2017,33(13):40-49.
[15]Fukushima T,Inoue E,Mitsuoka M,et al.Collision Vibration Characteristics with Interspace in Knife Driving System of Combine Harvester[J].Engineering in Agriculture,Environment and Food,2012,5(3):115-120.
[16]权龙哲,佟金,曾百功,等.玉米根茬收获系统的有限元模态分析与试验[J].农业工程学报,2011,27(11):15-20.
[17]许光辉,王安斌,宋月超,等.一种多层弹性部件轨道系统的动态特性试验研究[J].机械工程学报,2018,54(8):74-82.
[18]唐斌,刘广彬,许海平,等.大型工艺往复压缩机系统振动分析[J].中国机械工程,2014,25(7):873-877.
[19]杨景义.试验模态分析[M].北京:北京理工大学出版社,1990.
[20]俞云书.结构模态试验分析[M].北京:宇航出版社,2000.
[21]沃德·海伦,斯蒂芬·拉门兹,波尔·萨斯.模态分析理论与试验[M].北京:北京理工大学出版社,2001.
[22]周莉,李爱平,古志勇,等.基于实验模态分析的机床动态性能测试[J].中国工程机械学报,2014,12(4):360-363.
[23]李耀明,李有为,徐立章,等.联合收获机割台机架结构参数优化[J].农业工程学报,2014,30(18):30-37.
[24]王震虎,周巧英,刘开勇,等.基于响应面模型的白车身多目标轻量化设计[J].中国机械工程,2018,29(1):75-81.