基于虚拟样机动力学仿真的大豆扶禾器参数优化

针对大豆扶禾器因结构及作业参数不合理而造成割台损失增加的问题,在大豆植株性状及秸秆材料物理性能测定的基础上,应用Solidworks软件虚拟设计了大豆植株及扶禾器,并应用机械系统动力学仿真软件MSC.ADAMS构建其三维运动仿真模型,实现了在ADAMS/View环境下扶禾过程的运动仿真。利用Design-Expert6.0.10软件,采用二因素三水平正交试验方法,以作业速度及扶禾器倾角为影响因素,以扶禾器对植株x(作业方向)、y(垂直向上)、z(水平向左)三轴方向作用力为目标函数表征扶禾性能及割台损失,对影响扶禾性能的参数进行优化模拟试验研究,并进行了田间验证试验。结果表明,当作业速度为0.9m/s,扶禾倾角为22°时,扶禾器对大豆植株作用力x轴52.3N、y轴73.2N、z轴95.9N,扶禾效果最好且割台损失率1.19%。该研究为大豆扶禾器设计提供了理论参考。

Optimization of parameters for soybean lifter based on dynamic simulation of virtual prototype

According to unreasonable parameters about structure and operation of soybean-lifter making the loss of header increased, based on measured the plant properties and the mechanical properties of soybean stalk, the soybean plant model and lifter were established by CAD-software Solidworks and the virtual dynamic prototype was established by using the dynamic simulation software-ADAMS. The motion of soybean stalk's lifting process was simulated in ADAMS/View. Virtual orthogonal test of the two factors with three levels was employed to study the optimization of structural and operation parameters which affected lifter properties. The travel speed and the lifter angle were selected as factors, and the impact-force of x(direction of operation), y(vertical upward), z(horizontal to left direction) axis between soybean plant and lifter was selected as response function to represent the performance of lifting and the loss of header by using software Design-Expert 6.0.10. And virtual optimization results were verified by field test. The results indicated that the impact-force of x, y, z axis was 52.31, 73.52 and 95.87 N respectively when the working velocity was 0.9m/s and the lifter angle was 22°in the virtual tests and the performance of lifting was the best and the loss rate of header was 1.19% .The paper provides theory references for designing the soybean lifter.