Gas i.e. air, rate estimating method for e.g. hydrostatic bearing in aircraft field, involves acquiring signal emitted by pressurizing units using sensor, and estimating gas rate in liquid from characteristics of acquired signal

摘要

The method involves acquiring a vibro-acoustic signal emitted by oil pressurizing units using a vibro-acoustic signal sensor i.e. accelerometer (2), and estimating a gas i.e. air, rate in a lubricating liquid i.e. oil, from the characteristics of the acquired signal. The estimation comprises filtering and amplifying the acquired signal and determining signal's excitation frequencies. A signal's spectral power density is calculated based on the frequencies and attenuation of the density is calculated with respect to a spectral power density of a reference signal, during the gas rate estimation.