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。
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.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2014年第20期143-150,共8页
Journal of Mechanical Engineering
关键词
载荷谱
传动系
台架试验
时域外推
load spectnum
driveline
test bench
time-domain extrapolation
