The invention discloses an aircraft bearing
retainer guide surface lubricating
oil film thickness ultrasonic measurement method and
system, and belongs to the technical field of bearing lubricating
oil film thickness measurement. The invention aims to solve the problem that the existing method cannot accurately measure the thickness of the aircraft bearing
retainer guide surface lubricating
oil film. Comprising the following steps: transmitting ultrasonic
waves to a bearing
retainer guide surface through an ultrasonic
transducer; initial reference signals and measurement signals are collected for linear
frequency modulation Z transformation, and a retainer guide surface
transfer function is obtained; obtaining a mapping relation between a lagging phase of the retainer
coating and a
transfer function by combining a multi-layer medium structure ultrasonic
transfer model; setting an
estimation range of the oil film thickness; on the basis of the mapping relation, the lagging phase of the cage
coating corresponding to the oil film thickness
estimation value in the
estimation range is calculated; and
linear fitting is carried out on all the cage
coating lagging phases, and an oil film thickness estimation value corresponding to a minimum fitting error value is extracted as a final oil film thickness measurement value. The method is used for oil film thickness measurement.