农机化研究2024，Vol.46Issue(3)：21-29,9.
基于二阶欠阻尼阶跃响应的收获机割台液压缸选型分析
Selection Analysis of Hydraulic Cylinder of Harvester Header Based on Second-order Underdamped Step Response
摘要
Abstract
Header is an important part of grain harvester.In the aspect of determining the type selection of header hy-draulic cylinder,the traditional method mostly adopts the analysis of header weight and hydraulic system working load,and uses the method of classical mechanics to select the type of header hydraulic cylinder.With the development of auto-matic control theory,more and more header height closed-loop control technology began to appear on foreign leading har-vester models.At present,the method of only considering mechanical load analysis can not meet the needs of header height automatic control system.According to the requirements of steady-state analysis of the control system,on the premise of meeting the working load,the header oil cylinder also needs to consider the overshoot,reaction time,overshoot oscillation time and other factors of the system.In this paper,the header lifting movement process is modeled and ana-lyzed,and it is demonstrated that the header control model is a second-order underdamped model system.It is determined that the natural frequency and damping ratio determine the effect on the system dynamic index.Through the internal anal-ysis of the hydraulic cylinder,the transfer function of the header hydraulic cylinder system is obtained,and it is deter-mined that when other mechanical parameters remain unchanged,the diameter of the header cylinder affects the natural frequency and damping ratio of the header hydraulic cylinder system.The four system steady-state indexes of rise time,peak time,overshoot and regulation time are comprehensively used to determine the optimal header cylinder parameters.Finally,Amesim simulation test is carried out.This study provides a theoretical basis for the control strategy of header de-vice for the research and design of unmanned grain combine harvester.关键词
谷物收获机/割台液压缸/阶跃响应/稳态分析Key words
grain harvester/hydraulic header cylinder/step response/steady state analysis分类
农业科技引用本文复制引用
王志超,杨然兵,陈栋泉,王婕,李晓波..基于二阶欠阻尼阶跃响应的收获机割台液压缸选型分析[J].农机化研究,2024,46(3):21-29,9.基金项目
泰山产业领军人才工程项目(LJNY201804) （LJNY201804）
