关联用户的汽车传动系载荷谱室内台架试验编制方法
Weave Method Study of Customer Correlated Load Spectrum for Driveline Durability Indoor Test
摘要 为了编制汽车传动系室内台架耐久试验载荷,实车采集用户行驶载荷数据,采用雨流计数法和数理统计方法对测得的载荷数据进行压缩处理,在重构的载荷谱中找到不同转矩载荷等级所对应的转速和挡位信息,把传统的载荷-时间频次关系,转变为载荷-发动机飞轮旋转频次关系,同时记录各载荷等级对应的各个挡位的频次,获得基于不同载荷等级下转速和挡位的统计分布。利用门限峰值理论载荷外推方法获得包含转速和挡位信息的传动系时域外推载荷谱,运用重新定义采样率和样条插补方法对随机载荷进行处理,获得适合台架试验使用的随机载荷谱。把用户使用的实车工况数据与台架试验结合起来,避免了试验的盲目性,为准确评价汽车传动系零部件的可靠性和制定科学的室内台架试验规范提供依据。
Abstract:
In order to research the fatigue reliability of the vehicle powertrain system, a new load spectrum weave technique correlated customer usage is proposed based on automotive powertrain indoor test. It includes the compressive approach to random load time history based on rain-flow counting method and statistical theory, the speed and gear information corresponding the compression load are also received in the reconstruction spectrum. The traditional relationship between torque level and time is translated into torque level and speed range, meanwhile, the gear position is recorded. The statistical distribution based on different levels of Torque vs speed and vs gear are obtained. Using peak over threshold statistical extreme value theory, a method for extrapolation in the time domain is presented, the extrapolated load spectrum obtained from the extrapolated time signal contains the information about speed and gear. Defining new sampling rate and spline interpolation methods are used to modify the random load spectrum to the test rig properties. The technique can combine the real customer usage data to vehicle powertrain test bench, and avoid the test blindness. Provided an important foundation for precisely evaluating automotive powertrain reliability and establishing a reasonable principle of automotive powertrain reliability indoor test.
Author: LI Wenli SHI Xiaohui KE Jian SHI Quan ZOU Xihong YU Yong YI Peng
作者单位: 西南交通大学机械工程学院 成都 610031; 重庆理工大学汽车零部件先进制造技术教育部重点实验室 重庆 400054 重庆理工大学汽车零部件先进制造技术教育部重点实验室 重庆 400054 西南交通大学机械工程学院 成都 610031 重庆市科学技术研究院重庆轨道交通及汽车 摩托车 零部件研究中心 重庆 400054
刊 名 机械工程学报 ISTICEIPKU
年,卷(期): 2014, (20)
分类号: U467
机标分类号: TH1 U4
在线出版日期: 2014年12月3日