METHOD AND APPARATUS FOR NONDESTRUCTIVE INSPECTION OF ROLLER BEARING

PURPOSE:To make it possible to grasp deterioration degree quantitatively, by judging the deterioration degree from a ratio between the occurring frequency of envelop signals corresponding to the output of an acoustic emission (AE) sensor and the frequency of load applications. CONSTITUTION:The outpu...

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Bibliographische Detailangaben
Hauptverfasser:	MASUNO SHIGEMI, NAKAGAWA OSAMU, MISAWA ATSUSHI
Format:	Patent
Sprache:	eng
Schlagworte:	BEARINGS BLASTING ELEMENTS OR CRANKSHAFT MECHANISMS ENGINEERING ELEMENTS AND UNITS FLEXIBLE SHAFTS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES LIGHTING MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC ORINFRASONIC WAVES MEASURING MECHANICAL ENGINEERING PHYSICS ROTARY BODIES OTHER THAN GEARING ELEMENTS SHAFTS TESTING TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR THERMAL INSULATION IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	PURPOSE:To make it possible to grasp deterioration degree quantitatively, by judging the deterioration degree from a ratio between the occurring frequency of envelop signals corresponding to the output of an acoustic emission (AE) sensor and the frequency of load applications. CONSTITUTION:The output of an AE sensor 2, which is attached to a roller bearing 1, is processed in an preamplifier 3, an HPF 4, an LPF 5, a main amplifier 6 and an envelop detector circuit 7. A pulse signal outputted from a waveform shaping circuit 8 is supplied. The time interval of the AE signal is counted in a timer counter 9. The occurring frequency of the AE signal is counted in a pulse counter. When the time interval agrees with the time interval of a load which is applied to the roller bearing periodically, deterioration of the bearing 1 is specified. A ratio between the occurring frequency of the AE signal and the frequency of load applications is computed in an information processing circuit 11. The ratio is zero at the normal time and approaches 1 as the deterioration progresses. Thus, the deterioration degree of the bearing can be grasped quantitatively.