基于有限元模型的喷雾机喷杆弹性变形分析与控制  

Deformation analysis and control of elastic deformation for spray boom based on finite element model

作　　者：何耀杰 邱白晶[1] 杨亚飞[1] 马靖[1] 

机构地区：[1]江苏大学现代农业装备与技术省部共建教育部重点实验室,镇江212013

出　　处：《农业工程学报》2014年第6期28-36,共9页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家公益性行业(农业)科研专项(201203025-04);江苏省科技支撑计划(BE2011334);国家农业科技成果转化资金项目(2012GB2C100154);江苏省高校自然科学研究重大项目(10KJA470007);江苏省高校优势学科建设工程资助项目(苏财教(2011)8号)

摘　　要：以研究和抑制喷杆弹性变形为目的，基于ANSYS平台建立了喷杆的有限元模型并进行了数值模态分析，利用试验模态分析的方法对有限元模型及其模态信息进行了验证。依据所建立模型及其模态信息，在ADAMS平台中建立了机架喷杆模型，并对偏转、振荡以及翻滚3种典型运动引起的喷杆末端弹性变形量分别进行了谐响应分析，结果表明振荡是造成喷杆弹性变形的主要因素。为了抑制喷杆的弹性变形，在喷杆与机架之间添加了拉索，并分析了拉索安装在4种不同位置时，喷杆受到频率范围为0～10 Hz振荡激励后的弹性变形情况，结果表明：3/4喷杆位置处为4种安装位置中最合适处，此时喷杆各处形变量均小于10 mm，为4种中最小，相较未添加拉索时喷杆末端产生接近80 mm弹性变形来说，对弹性变形的抑制效果明显。The accelerations of boom sprayer caused by soil unevenness may lead to the spray boom’s elastic deformation, which would cause uneven spray deposit. In order to attenuate spray boom’s elastic deformation, a finite element model was built based on ANSYS, and then the modal information of the model was obtained by numerical modal analysis. For the simplification of spray boom’s finite element model, modal test was used to validate the finite element model and its modal information, the test introduced a way that multi points and multi directions exciting, one point and one direction response to obtain the frequency response functions （FRFs）. Exciting signal was generated by a hammer （LC-1） and detected by a force sensor （AD-YD305）. Response signal was measured by an acceleration sensor （YD-1）. After the exciting and response signals were measured, the FRFs were obtained in SD380 dynamic signal analyzer through fast frourier transform （FFT）, and the modal parameters were identified in STAR7. After the test, a comparison was conducted between test and calculation. The result showed that the first 6 modes’ resonance frequency difference between finite element model and test modal model were less than 10%, the modal assurance criterion （MAC） between finite element model and test modal model of the first 6 modes were more than 0.8, which indicated that the finite element model and the modal information that the model contained could be used for engineering research. Modal analysis result showed that the first mode frequency of spray boom was 9.16 Hz, while the excitation frequency of spray machine chassis was 0-10 Hz. It was apparent that the first mode frequency of spray boom was between the range of the excitation frequency of spray machine chassis. Since the spray boom was fixed on the chassis’s frame, the motions of chassis caused by uneven ground would directly transfer to the spray boom, which may lead to spray boom’s elastic deformation. In order to study the elastic deformati

关 键 词：弹性变形 模态分析 模型 喷杆 有限元 

分 类 号：S49[农业科学—植物保护]