基于极值外推的特种车辆疲劳耐久性多轴载荷谱编制  

Compilation of Multiaxial Load Spectra for Fatigue Durability of Special Vehicle Based on Extreme Value Extrapolation

作　　者：郑国峰 杨思宇 陈柏先 隗寒冰[1] 赵树恩[1] ZHENG Guofeng;YANG Siyu;CHEN Baixian;WEI Hanbing;ZHAO Shu'en(School of Mechatronics and Vehicle Engineering,Chongqing Jiaotong University,Chongqing 400074,China;China Automotive Engineering Research Institute Co.,Ltd.,Chongqing 401122,China)

机构地区：[1]重庆交通大学机电与车辆工程学院,重庆400074 [2]中国汽车工程研究院股份有限公司,重庆401122

出　　处：《兵工学报》2024年第7期2414-2425,共12页Acta Armamentarii

基　　金：国家自然科学基金项目(52305147);重庆市自然科学基金面上项目(CSTB2022NSCQ-MSX1266);中国博士后科学基金面上项目(2022M713438);重庆市教委科学技术研究计划项目(KJQN2021000713)。

摘　　要：非道路特种车辆服役载荷谱是整车结构耐久性的关键,为此提出基于极值外推的特种车辆疲劳耐久性多轴服役载荷编制方法。考虑到多轴载荷谱外推时的载荷通道之间具有相位关系,开展以临界平面损伤参量为基础的多轴载荷等效合成研究;构建极值超出量服从广义Pareto分布的多轴外推模型。利用等效合成载荷谱进行载荷外推,将基于等效合成系数获取的外推量分配到每个载荷通道上,实现考虑相位关系的多轴载荷外推。以典型工况下特种车辆的轮端六向力信号为研究对象进行多轴外推,并对比外推前后的载荷谱与采集载荷谱通道之间的相位关系、穿级计数、雨流计数和功率谱密度。研究结果表明:基于极值外推的特种车辆整车疲劳耐久性多轴载荷编制,可以实现在相同典型工况下多轴载荷谱的有效预测。The service load spectrum of off-road special vehicle is the key to the structural durability of the vehicle.A method for compiling the multiaxial load spectra for the fatigue durability of special vehicle based on extreme value extrapolation is proposed.Considering the phase relationship between the load channels during the extrapolation of multiaxial load spectra,the equivalent synthesis of multiaxial loads based on the critical plane damage parameter is studied.A multiaxial extrapolation model for the exceedance of extreme value being subjected to the generalized Pareto distribution is extablished.The load spectra are extrapolated using the equivalent synthesized load spectra,and the extrapolated variation is allocated to each load channel based on the synthesis coefficient to achieve the multiaxial load extrapolation considering the phase relationship.The multiaxial extrapolation is conducted by taking the six-directional force signal at the wheel center of special vehicles under typical working conditions as the objective.The aspects of the load spectra before and after extrapolation and the load spectra acquisited are all compared in terms of phase relationship,level crossing counting,rainflow counting and power spectral density.The results indicate that the multiaxial load compilation of special vehicle fatigue durability based on extreme value extrapolation can be used to effectively predict the multiaxial load spectra under the same typical working conditions.

关 键 词：特种车辆 多轴载荷谱 极值外推 相位关系 

分 类 号：TJ306[兵器科学与技术—火炮、自动武器与弹药工程]