切割厚度可调甜菜切顶机构的分析与参数优化

针对现有甜菜切顶机构在切顶过程中切割厚度不能随甜菜青顶大小自动调节问题,提出一种新的切顶机构。对其工作原理进行分析,建立其运动学模型,推导机构各关键点的（角）位移、（角）速度和（角）加速度方程。基于Visual Basic 6.0编写机构的运动学仿真与优化软件,利用该软件分析链轮传动比、齿轮节圆半径、摆臂长度、仿形轮半径等主要参数对切刀切顶轨迹和甜菜青顶切割厚度的影响,并通过人机交互优化方法得到一组较优的机构参数,其对应的切顶轨迹曲线能满足甜菜切顶的农艺要求。基于Matlab语言编程,采用遗传算法对仿形轮线速度和牵引速度进行了分析与优化,优化结果优于经验值。最后,根据优化所得机构参数建立了切顶...

Full description

Saved in:
Bibliographic Details
Published in农业工程学报 Vol. 29; no. 18; pp. 26 - 33
Main Author 张国凤 徐文龙 范素香
Format Journal Article
LanguageChinese
Published 浙江理工大学 机械与自动控制学院,杭州,310018%华北水利水电学院 机械学院,郑州,450011 2013
Subjects
仿形机构
优化
农业机械
切顶机构
参数
模型
甜菜
agricultural machinery
models
参数
模型
切顶机构
甜菜
sugar beet
beet top cutting mechanism
optimization
仿形机构
优化
农业机械
profiling mechanism
Online AccessGet full text
ISSN1002-6819
DOI10.3969/j.issn.1002-6819.2013.18.004

Cover

More Information
Summary:针对现有甜菜切顶机构在切顶过程中切割厚度不能随甜菜青顶大小自动调节问题,提出一种新的切顶机构。对其工作原理进行分析,建立其运动学模型,推导机构各关键点的（角）位移、（角）速度和（角）加速度方程。基于Visual Basic 6.0编写机构的运动学仿真与优化软件,利用该软件分析链轮传动比、齿轮节圆半径、摆臂长度、仿形轮半径等主要参数对切刀切顶轨迹和甜菜青顶切割厚度的影响,并通过人机交互优化方法得到一组较优的机构参数,其对应的切顶轨迹曲线能满足甜菜切顶的农艺要求。基于Matlab语言编程,采用遗传算法对仿形轮线速度和牵引速度进行了分析与优化,优化结果优于经验值。最后,根据优化所得机构参数建立了切顶机构三维模型,通过ADAMS虚拟样机进行试验验证,虚拟试验结果与理论分析结果一致。
Bibliography:11-2047/S
optimization, models, agricultural machinery, sugar beet, beet top cutting mechanism, profiling mechanism
Zhang Guofeng, Xu Wenlong, Fan Suxiang （1. College of Mechanical Engineering and Automation, Zhejiang Sci-Tech University, Hangzhou 310018, China; 2. School of Mechanical Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, China）
As one of the key components of the beet harvester, the beet top cutting mechanism plays a role in the first step of the harvest. The cutting quality has an important impact on the economic benefits of the sugar industries and farmers. In order to solve the problem that the existing beet top cutting mechanism can＇t adjust the cutting thickness while the mechanism runs, a new profiling top cutting mechanism was proposed, which consists of a parallel four-bar linkage, chain transmission, gear-rack mechanism, and profiling wheel. When the profiling wheel runs over the big beet top, the cutter attached on the rack will move down by the
ISSN:1002-6819
DOI:10.3969/j.issn.1002-6819.2013.18.004