多相关子系统输入中源识别的分析研究

摘要

建立了子系统输入单输出系统模型,分析双子系统输入单输出系统中各级输入之间的相关关系,给出集合平均的输入关系式.在此基础上推导多相关子系统输入各级输入之间的相关关系和集合平均输入模型.针对多相关子系统输入单输出系统中输入的源识别问题,分析了子系统各级输入各种相关情况下输入相关矩阵的数值变化以及对输出的影响,通过相干分析得到判断子系统各级输入对输出贡献量的方法.最后给出某汽车前后轴垂直平面内振动试验数据的处理结果,验证了理论分析的实用性.理论分析及试验对同类工程问题具有参考价值.%A subsystem-inputs/single-output system model was proposed.The correlation between inputs of a two subsystem-inputs/single-output system was analysed and the input relationship after average process was provided.On this basis, the correlation between inputs of a multi correlated subsystem-inputs/single-output system was derived and the model after average process was proposed.To address the source identification of inputs in multi correlated subsysteminputs system, the changes in values of correlated input matrix and the impact on the output in various relevant cases of subsystem-inputs were analyzed According to coherence analysis, the contributions of inputs to the output were obtained.The vibration test data, measured in the vertical plane of an automobile front and rear axes were presented and accordingly the usefulness of the theoretical analysis was verified.