[특허]Method of maintaining components subject to fatigue failure

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01B-003/44
출원번호	US-0101823 (1998-07-16)
국제출원번호	PCT/US97/21628 (1997-11-26)
§371/§102 date	19980716 (19980716)
국제공개번호	WO-9824042 (1998-06-04)
발명자 / 주소	Eastman Donald G. Elgin Richard L. Hao Beilene
출원인 / 주소	Hamilton Sundstrand Corporation
대리인 / 주소	Wood, Phillips, VanSanten, Clark & Mortimer
인용정보	피인용 횟수 : 45 인용 특허 : 9

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A method is provided for maintaining components subject to fatigue failure during in service use. The method uses statistical distributions (10) in a simulation of in service use (16) of a fleet of components to predict the failure rate (12) of the fleet over a fixed time increment (14, 26) for an a

A method is provided for maintaining components subject to fatigue failure during in service use. The method uses statistical distributions (10) in a simulation of in service use (16) of a fleet of components to predict the failure rate (12) of the fleet over a fixed time increment (14, 26) for an assumed inspection program. These predictions are used to determine an operating plan (20), including an inspection program, that will maintain an acceptable failure rate by detecting components with fatigue indications and removing the components prior to failure (22). The inspection program provides actual fatigue data resulting from in service use (18). As the inspection data base grows, the simulation is revised (24, 48) to incorporate the data. The predicted failure rates and the operating plan (20) are then updated based on the revised simulation.

대표청구항 ▼

[ What is claimed is:] [1.]1. A method of maintaining components subject to fatigue failure during in service use, the method comprising the steps of:a) determining a probabilistic distribution of a fatigue indication occurrence and a probabilistic distribution of a fatigue failure life for a given

[ What is claimed is:] [1.]1. A method of maintaining components subject to fatigue failure during in service use, the method comprising the steps of:a) determining a probabilistic distribution of a fatigue indication occurrence and a probabilistic distribution of a fatigue failure life for a given component that is subject to fatigue failure from actual in service use;b) setting an acceptable in service failure rate for the given component;c) forecasting each given components that will be in service during a first time increment;d) simulating in service use and inspection of the given components over the first time increment to determine an acceptable operating plan for the given components based on1) the probabilistic distributions of the fatigue indication occurrence and fatigue failure life,2) a probability of detecting a detectible fatigue indication during inspection of any one of the given components,3) the forecasted components that will be in service during the first time increment, and4) the acceptable in service failure rate;e) placing a plurality of the given component in service;f) inspecting the given components that are in service according to the operating plan to1) collect fatigue data produced by the in service usage of the given components, and2) if a fatigue indication is detected in one of the given components during inspection, removing the one given component from service to prevent an in service failure;g) determining revised probabilistic distributions of the fatigue indication occurrence and the fatigue failure life for the given component based on the fatigue failure data collected during inspection;h) forecasting each of the given components that will be in service during a subsequent time increment;i) re-simulating in service usage and inspection of the given components over the subsequent time period to determine a revised acceptable operating plan for the given components based on1) the revised probabilistic distributions of the fatigue indication occurrence and fatigue failure life,2) a probability of detecting a detectible fatigue indication during inspection of any one of the given components,3) the forecasted components that will be in service during the subsequent time increment, and4) the acceptable in service failure rate; andj) inspecting the given components that are in service according to the revised operating plan to1) collect additional fatigue failure data produced by the in service usage of the given components, and2) if a fatigue indication is detected in one of the given components during inspection, removing the one given component from service to prevent an in service failure.

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