摘要
目前针对大型高地隙喷杆喷雾机在田间作业时,受到喷雾机车身摆动影响而产生振荡、摇摆和翻滚等有害运动的问题,结合现有喷杆悬架系统和功能,设计了一种具有地面仿形功能的双连杆梯形喷杆悬架,并对喷杆悬架的升降机构、喷杆的折叠机构、高度调节机构和防撞回弹机构进行了理论分析和结构设计,建立了三维模型。通过四因素三水平的正交试验设计,研究各因素对喷杆质量和第1阶固有频率的交互影响,并应用Design-Expert软件对试验结果进行分析优化。优化结果表明:当1号方钢管壁厚、2号方钢管壁厚、矩形钢管壁厚和四边形钢管壁厚分别为5、3、4.5、3.5mm时,质量最小,为1146.8kg,对应的第1阶固有频率为5.17Hz,有效避开了路面激励频率。利用ANSYS Workbench软件,以位移功率谱密度(PSD)函数为激励,对优化前后的喷雾机喷杆模型分别进行随机振动仿真,结果表明:喷杆尺寸优化后垂直方向振动位移响应量并没有显著变化。研究结果为喷雾机喷杆振动特性分析和疲劳特性分析提供了理论依据。
Aiming at the large-scale high ground clearance boom sprayer currently operating in the field,it is affected by the swing of the sprayer’s body and causing harmful motions such as oscillation,swaying and rolling.Combining the existing boom suspension system and functions,this article designs a ground-based.The double-link trapezoidal spray boom suspension with profiling function has carried out theoretical analysis and structural design on the lifting mechanism of the boom suspension,the folding mechanism of the boom,the height adjustment mechanism and the anti-collision rebound mechanism,and a three-dimensional model has been established.Through a four-factor and three-level orthogonal experimental design,the interactive effects of each factor on the quality of the spray bar and the first-order natural frequency are studied,and the design-expert software is used to analyze and optimize the experimental results.The optimization results show that when the wall thickness of No.1 square steel pipe,the wall thickness of No.2 square steel pipe,the wall thickness of rectangular steel pipe and the wall thickness of quadrilateral steel pipe are 5,3,4.5,3.5mm,respectively,the mass is the smallest,which is 1146.8kg.The first-order natural frequency is 5.17 Hz,which effectively avoids the road excitation frequency.Using ANSYS Workbench software,with displacement power spectral density(PSD)function as excitation,random vibration simulations were performed on the sprayer boom models before and after optimization.The results showed that the vertical vibration displacement response amount after the optimization of the boom size was not significant changes.The research results provide a theoretical basis for the analysis of the vibration characteristics and fatigue characteristics of the sprayer boom.
作者
付磊
杜岳峰
娄秀华
毛恩荣
李茂峰
Fu Lei;Du Yuefeng;Lou Xiuhua;Mao Enrong;Li Maofeng(College of Engineering,China Agricultural University,Beijing 100083,China;Key Laboratory of Optimized Design for Modern Agricultural Equipment,China Agricultural University,Beijing 100083,China)
出处
《农机化研究》
北大核心
2023年第11期27-35,共9页
Journal of Agricultural Mechanization Research
基金
山东省重大科技创新工程项目(2019JZZY010728)。
关键词
喷杆喷雾机
喷杆
正交试验
位移功率谱密度
boom sprayer
boom
orthogonal test
displacement power spectral density
