초록 ▼

For automatically predicting machine failure a transducer sensor, such as piezoelectric crystal, is applied to a machine for sensing machine motion and structure-borne sound, including vibration friction, and shock waves. The structure-borne sound and motion sensed is converted to electrical signals

For automatically predicting machine failure a transducer sensor, such as piezoelectric crystal, is applied to a machine for sensing machine motion and structure-borne sound, including vibration friction, and shock waves. The structure-borne sound and motion sensed is converted to electrical signals which are filtered to leave only the friction and shock waves, which waves are processed, as by detecting the envelope and integrating beneath the envelope, resulting in a measure of friction and shock wave energy, i.e., stress wave energy. This measure is computed and processed for producing fault progression displays for periodic and aperiodic damage. This is accomplished in a personal computer, menu-driven environment.

대표청구항 ▼

[ What I claim is:] [14.] A system for predicting failures in rotary and reciprocating machinery, including bearings, gears, lubricants, and the like, said system comprising:a plurality of stress wave sensor transducers for attachment to the machinery at selected points to produce a corresponding nu

[ What I claim is:] [14.] A system for predicting failures in rotary and reciprocating machinery, including bearings, gears, lubricants, and the like, said system comprising:a plurality of stress wave sensor transducers for attachment to the machinery at selected points to produce a corresponding number of electrical signals corresponding to vibration, friction, and shock waves produced in the machinery during operation;multiplexing means, in electrical communication with said transducers, for receiving said electrical signals from said transducers and transmitting at least one selected signal corresponding to at least one preselected transducer;filtering means, in electrical communication with said multiplexing means, for filtering out frequencies corresponding to vibration and passing only friction and shock waves, said filtering means deriving a resultant signal for each said preselected signal, said resultant signal being in a predetermined frequency range corresponding to said transducers;digital processor means, in electrical communication with said filtering means, for converting analog signals to digital, for computing stress wave energy corresponding to said envelopes and for providing control and display logic to select transducers to be monitored; andcontrol processing means, in electrical communication with said multiplexing means and said digital processing means for selecting said at least one selected signal, for communicating with said transducers and for displaying friction and shock wave energy measurements and envelope measurements.