某供油调节器卡涩故障的特征分析与诊断

Characteristic analysis and diagnostic method for jam faults of a fuel-controller

给出了考虑干摩擦力的某供油调节器的动态数学模型,分析了干摩擦力对供油调节器特性的影响。研究了由于摩擦力引起的参数变化,找出了油针正负向速度这一既反映干摩擦力大小又直接影响系统特性的参数。对从实际数据中分离出的反映油针正负向移动的序列,采用波形匹配的最小二乘拟合算法,得出油针正负向速度。经过理论计算和实验数据分析,验证了此方法的可行性。

A dynamic mathematic model of a fuel-controller was provided, and the influence of the dry friction was studied. The parameter change caused by the dry friction was analyzed, and the positive and negative speed of the small piston was proved to be an effective parameter that was reactive for the performance. The positive and negative speed of the small piston could be obtained by the method of least squares. The comparison between theoretical analysis and experimental calculation validates the feasibility of the method.