结构准静态解耦载荷识别方法与结构随机载荷谱  

Quasi-static Decoupling Method for Structural Dynamic Load Identification and Random Load Spectrum Establishment for Bogie Frame

作　　者：孙晶晶[1] 孙守光[1] 王斌杰[1] 马爽 张亚禹 李强[1] SUN Jingjing;SUN Shouguang;WANG Binjie;MA Shuang;ZHANG Yayu;LI Qiang(School of Mechanical,Electronic and Control Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京交通大学机械与电子控制工程学院,北京100044

出　　处：《铁道学报》2021年第5期71-79,共9页Journal of the China Railway Society

基　　金：国家自然科学基金(11790281)。

摘　　要：在分析结构载荷识别过程中误差产生机理的基础上,针对现有载荷识别方法不适用低频响应结构载荷识别问题,建立了结构准静态解耦载荷识别方法。通过确保载荷响应传递矩阵的良性状态和省略传递矩阵主要的求逆运算过程,实现对载荷识别误差的有效控制。采用提速客车转向架构架这一典型的低频响应结构进行了方法验证。结果表明:该载荷识别方法可以有效控制长周期服役条件下的载荷识别误差,解决现有载荷识别方法不适用于低频响应结构载荷识别的问题。在构架可靠性设计现行国际规范的基础上,补充确立了蛇行载荷系,完善了构架基本载荷系,进一步结合构架各基本载荷系的实测运用载荷时间历程,可建立构架随机载荷谱。Based on the analysis of the error generation mechanism in the process of structural load identification,a quasi-static decoupling method was proposed in response to the problem that the existing load identification methods are not applicable to dynamic load identification of structures with low-frequency response.The load identification error can be effectively controlled by reducing the ill-posedness of load-strain transfer matrix and omitting the main inverse operation process.The proposed method was validated by identifying the long-term service loads of the bogie frame of a passenger car,a typical engineering structure with low frequency response.The results show that the proposed method can can effectively control the load identification error under long-term service conditions and solve the problem that the existing load identification methods are not applicable to low-frequency response structure load identification.With the measured load-time history,a random load spectrum of the bogie frame was established for the elementary load series according to the current international code for reliability design with the addition of the load corresponding to hunting motion of the bogie frame.

关 键 词：载荷识别 低频响应结构 载荷谱 可靠性设计 

分 类 号：U260.17[机械工程—车辆工程]