摘要 为了体例装载机事情装置载荷谱举办布局疲惫机能研究,提出了一种基于动臂截面弯矩等效的装载机外载荷当量要领,将装载机铲装物料时所受外载荷简化为一个浸染在铲斗上的会合载荷并举办载荷谱体例。以动臂前后两头铰点连线为基准构建动臂局部坐标系,将铲斗铰点实测载荷转化为局部坐标系下动臂铰点载荷,研究铲掘姿态下动臂截面弯矩和装载机外载荷的同步对应干系,确定了外载荷浸染点位置和浸染偏向,操作动臂最大弯矩截面的弯矩等效成立了装载机外载荷的当量数学模子。由实测的铲斗铰点载荷时间过程和装载机外载荷当量模子获得ZL50G装载机当量外载荷的时间过程,回收雨流计数获得典范功课介质下当量外载荷均值、幅值、频次的统计特性,体例多工况合成的事情装置疲惫试验措施载荷谱。功效表白:基于动臂截面弯矩等效要领可以或许获取牢靠姿态下装载机当量外载荷浸染位置和浸染偏向;操作动臂最大弯矩截面的弯矩获得当量载荷时间过程,且在当量载荷与实测载荷下动臂截面弯矩变革纪律和巨细保持一致;当量载荷均值听从正态漫衍、幅值听从三参数威布尔漫衍,操作雨流计数和参数外推法体例的合用于事情装置疲惫试验的变均值加快加载措施载荷谱,缩短了疲惫台架试验的加载时间。提出的基于动臂截面弯矩等效的装载机外载荷当量模子以及载荷谱体例要领,可为装载机事情装置疲惫寿命评估和台架试验类型的拟定提供依据。 To study the fatigue performance of the load spectrum of loader working device, an equivalent method of loader external load based on the bending moment section was suggested. When the loader loads the material, the load on the working device was simplified as a concentrated external load acting on the bucket and compiled the load spectrum. A boom coordinate system was constructed based on a hinge line at the front and rear ends of the moving arm, and the actual load of the bucket hinge point was transformed into a hinge load on the boom structure under the boom coordinate system. The synchronous relationship between the moment of the boom section and the external load of the working device was studied, and the action point position and direction of the external force was determined. The external load equivalent model of the working device based on the bending moment of the maximum bending moment section of the boom was established. Considering the load equivalent load of the bucket hinge point under typical working condition of the ZL50G loader working device as the basis, the statistical characteristics of mean load, frequency, and amplitude were obtained by rain flow counting. The load spectrum of the fatigue test program under various working conditions was determined. The results show that the position and direction of the equivalent external load on the working device can be accurately obtained based on the bending moment section equivalent method. The time history of the equivalent load is obtained by the bending moment section of the maximum bending moment section of the boom, and the value and change rule of the boom bending moment section are coincident under the conditions of equivalent load and measured load. The mean of the equivalent load is fit to the normal distribution and the amplitude is fit to the three-parameter Weibull distribution. The variable mean load spectrum for the fatigue test of the working equipment of the loader is compiled using rain flow counting and parameter extrapolation, and
作者 万一品 宋绪丁 吕彭民 员征文 WAN Yi-pin;SONG Xu-ding;LU Peng-min;YUAN Zheng-wen(Key Laboratory of Road Construction Technology and Equipment, Ministry of Education, Chang’an University,Xi’an 710064, Shaanxi, China;Engineering Machinery Research Institute, Xuzhou Construction Machinery Group, Xuzhou 221004, Jiangsu, China)
机构地域 长安大学阶梯施工技能与装备教诲部重点尝试室 徐工团体江苏徐州工程机器研究院
出处 《长安大学学报:自然科学版》 EI CAS CSCD 北大焦点 2019年第2期117-126,共10页 JOurnal of Chang’an University:Natural Science Edition
基金 “十二五”国度科技支撑打算项目(2015BAF07B02) 中央高校根基科研业务费专项资金项目(300102259304).