宽幅往复式割草机护刃器梁疲劳寿命分析  

Fatigue Life Analysis of the Blade Guard Beam of a Wide Reciprocating Mower

作　　者：武文亮 郭志平[1] 贺占清 李渊[1] 杨莉 包德胜 无 WU Wenliang;GUO Zhiping;HE Zhanqing;LI Yuan;YANG Li;BAO Desheng;无(School of Mechanical Engineering,Inner Mongolia University of Technology,Huhehaote 010051,China;Inner Mongolia Huade New Technology CO,Ltd.Huhehaote 010020,China;Chinese Academy of Agricultural MechanizationHohhot Branch,Huhehaote 010020,China)

机构地区：[1]内蒙古工业大学机械工程学院,呼和浩特010051 [2]内蒙古华德新技术有限公司,呼和浩特010020 [3]中国农业机械化科学研究院呼和浩特分院有限公司,呼和浩特010020

出　　处：《机械设计与研究》2020年第4期200-204,209,共6页Machine Design And Research

基　　金：国家重点研发计划资助项目(2016YFD0701700);内蒙古自治区科技重大专项(zdzx2018003)。

摘　　要：针对华德9GQS-4.6型往复式宽幅割草机护刃器梁长宽比大、刚度差,且作业环境荷载复杂,疲劳损伤严重关键问题,对其载荷特性和疲劳寿命展开研究。首先对护刃器梁进行模态分析获得固有频率和振型;在有限元分析的基础上,确定护刃器梁疲劳损伤危险点,搭建测试系统采集割草机作业的时变数据并编制路面谱;利用功率密度与时频分析相结合的疲劳寿命分析方法计算护刃器梁疲劳寿命,得到危险点寿命为2671296 h,接近实际工作寿命。In this paper,the aspect ratio of the beam Ward 9GQS-4.6 type reciprocating wide mower blade protection is large,stiffness is poor,and complex operating environment loads,severe fatigue damage critical issues,its load and fatigue life properties of a study.This paper first performs a modal analysis on the blade guard beam to obtain the natural frequency and mode shape.Based on the finite element analysis,the fatigue damage danger point of the blade guard beam is determined,and a test system is set up to collect time-varying data of the lawnmower operation and compile it.Pavement spectrum.The fatigue life analysis method combining power density and time-frequency analysis was used to calculate the fatigue life of the blade guard beam.The life of the dangerous point was 2671296 h,which was close to the actual working life.

关 键 词：往复式割草机 护刃器梁 载荷特性 路面载荷谱 疲劳寿命 

分 类 号：S23-0B[农业科学—农业机械化工程]