基于导航定位原理的火箭涡轮泵轴承故障诊断

为准确判断火箭发动机涡轮泵轴承在试验台上试验时发生故障的部位，同时避免通过轴承特征频率诊断轴承故障的方法所带来的不确定性，基于GPS卫星导航定位原理，利用时幅曲线的相位信息，提出一种新的轴承故障诊断方法:振源坐标定位法，即通过四个已知坐标的振动传感器测得同一振动波的时幅曲线相位差判定振源位置。将试验台上轴承和四个振动信号传感器安放在坐标已知的直角坐标系中，利用时幅曲线拐点分析法准确捕获振动信号到达四个传感器的时刻，再利用这四个时刻和已知坐标计算出振源位置坐标，最后根据振源位置坐标判断其是否为轴承故障及具体故障部位。通过仿真计算证明该方法理论上可行。

Fault Diagnosis of Rocket Turbine Pump Bearing Based on Navigation and Position Principle

 In order to determine the fault position of a turbine pump bearing and avoid the ambiguity of the fault diagnosis of the turbine pump bearing by the characteristic frequency, a new method of the bearing fault diagnosis is proposed by using the phase information of the amplitude-time curve. Just like GPS, the high speed rolling element bearing and four vibration signal sensors are set in the rectangular coordinate system with known coordinates. The exactly arrival moments of the characteristic frequency signals to the sensors can be figured out accurately by the amplitude-time inflection algorithm from the vibration data. The vibration source position coordinates can be deduced from these four moments and the four known sensor’s coordinates. According to the vibration source coordinates, whether it is the bearing failure because of different element bearing occupying different space can be determined. The simulation results show that the method is feasible theoretically.