基于ANSYS的共振装置三维系统建模及优化设计
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摘要
为提高小麦联合收割机的使用寿命、降低收割作业过程中产生的共振,基于ANSYS分析理论,对易产生共振的核心装置进行三维系统建模和优化设计。通过分析联合收割机工作机理及运动特点,根据机械振动理论和激振频率模型,利用UG软件,选取收割机的机架和收割系统作为研究对象,对其进行结构优化后得出三维系统物理模型,并导入ANSYS分析软件进行模态求解分析得出前4阶振型。从振型图可知:优化设计较好避开了共振点。振动试验结果表明:有限元计算的固有频率与振动试验值误差在±8%范围内,机架与割台质量分别降低15. 3%和8. 8%。由此验证了三维系统建模参数设计的合理性与可行性,从而为类似收割机的振动分析提供思路与参考。
In order to improve the service life of the wheat combine harvester and reduce the resonance defects in the harvesting operation,the three-dimensional system modeling and optimization design of the core device which would be easy to produce resonance were carried out based on the theory of ANSYS analysis. By understanding the working mechanism and movement characteristics of the combine harvester,the frame and the harvesting system of the harvester were selected as the research object,then the three-dimensional system physical model was obtained by UG software after the optimization of the structure according to the mechanical vibration theory and the excitation frequency model. The first four modes of vibration mode were obtained by introducing the model into the ANSYS analysis software,the optimal design avoided the resonance point from the mode of vibration then the vibration test was further verified,the results showed that the error between the natural frequency and the vibration test value of the finite element calculation was within the range of 8%,and the quality of the frame was reduced by 15. 3% and the cutting platform was 8. 8% respectively,which indicated that the 3 D system modeling parameter design were reasonable and feasible also could provide ideas and reference for similar harvester vibration analysis.
In order to improve the service life of the wheat combine harvester and reduce the resonance defects in the harvesting operation,the three-dimensional system modeling and optimization design of the core device which would be easy to produce resonance were carried out based on the theory of ANSYS analysis. By understanding the working mechanism and movement characteristics of the combine harvester,the frame and the harvesting system of the harvester were selected as the research object,then the three-dimensional system physical model was obtained by UG software after the optimization of the structure according to the mechanical vibration theory and the excitation frequency model. The first four modes of vibration mode were obtained by introducing the model into the ANSYS analysis software,the optimal design avoided the resonance point from the mode of vibration then the vibration test was further verified,the results showed that the error between the natural frequency and the vibration test value of the finite element calculation was within the range of 8%,and the quality of the frame was reduced by 15. 3% and the cutting platform was 8. 8% respectively,which indicated that the 3 D system modeling parameter design were reasonable and feasible also could provide ideas and reference for similar harvester vibration analysis.
引文
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[2]刘玉冬,潘俊兵,陈亚娅,等.枣园修剪机连接座的设计及有限元分析[J].农机化研究,2018,40(10):29-33.
[3]吴超,李金龙,廖敏.收割机变速器箱体模态分析及结构改进[J].中国农机化,2016(9):56-61.
[4]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(18):30-37.
[5]李海亮,汪春,胡军,等.宽幅播种机折叠机架的模态分析[J].农机化研究,2017,39(6):60-63,68.
[6]沈欣.传动轴精拔前处理工艺优化及冷拔过程有限元分析[D].长沙:南华大学,2013.
[7]何玉静,申江峰,余泳昌,等.喷雾车工作台支撑架的模态分析[J].农机化研究,2015,37(12):74-77.
[8]李尚平,王梦萍,莫翰宁,等.基于动态特性的甘蔗收获机刀架仿真和模态分析[J].农机化研究,2018,40(12):17-22,29.
[9]王瑞.履带式联合收割机载荷测试与传动轴强度分析[D].镇江:江苏大学,2015.
[10]董冠华,殷勤,刘蕴,等.基于模态分析理论的结合部动刚度辨识[J].振动与冲击,2017(20):125-131.
[11]马颖,李成华,张国梁,等.基于ANSYS的播种机牵引梁模态分析[J].农机化研究,2010,32(6):80-82,86.
[12]关卓怀,吴崇友,汤庆,等.联合收获机脱粒滚筒有限元模态分析与试验[J].农机化研究,2016,38(8):136-140.
[13]潘远香.小型半喂入水稻联合收割机割台系统设计研究[D].贵阳:贵州大学,2014.
[14]吴思浩,李粤,张喜瑞,等.基于模态分析的立式香蕉秸秆粉碎还田机机架优化[J].农机化研究. 2017,39(5):46-51.
[15]郭昌进,杨喜,王金丽,等.基于ANSYS Workbench的甘蔗叶粉碎机机架模态分析[J].农机化研究,2014,36(8):23-26.
[16]臧世宇.谷物联合收割机脱粒机机架有限元分析及优化[D].合肥:安徽农业大学,2016.
[17]张俊晶,董袖青.双轴转台装配体的模态分析[J].机械制造,2018(1):61-63.
[18]沈伟,廖敏,王强,等.基于拓扑优化的变速箱壳体轻量化设计[J].农机化研究,2018,40(4):234-241.
[19]孙朋朋.履带式联合收割机底盘机架振动试验研究与结构优化[D].镇江:江苏大学,2013.
[20]薛忠,郭向明,黄正明,等.芦笋施肥机机架有限元模态分析[J].农机化研究,2014,36(6):23-26,32.