Brake condition monitoring
First Claim
1. A method of monitoring the usage of aircraft brake members having facing friction surfaces, the method comprising:
- detecting each actuation of the brake members;
making a separate record of each actuation in which there is relative movement of the facing friction surfaces which causes wear; and
determining brake usage from that record, the method of determining relative movement of the facing friction surfaces which causes wear including the steps of;
detecting a change in temperature of the brake members on actuation thereof;
generating signals according to the detected changes in temperature;
twice differentiating said signals and;
identifying from said signals actuations of the brake members which cause a change in temperature that is an increase above a pre-selected threshold value by comparing said twice differentiated signals with said pre-selected thereshold value and identifying those actuations that cause a change in temperature that is an increase above said pre-selected threshold value as actuations in which there is relative movement of the facing friction surfaces that causes wear.
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Accused Products
Abstract
A system and method for monitoring the applications of carbon-carbon brakes of an aircraft to determine brake condition and operate a brake maintenance program or charge a brake system user. The system and method includes monitoring each actuation of the brakes and making a separate record of each actuation of the brakes in which there is relative movement of the facing friction surfaces that cause wear, and from that separate record determining brake usage. The monitoring may include measuring changes and processing the signals to distinguish between those which fall below and those which are above a threshold value. The method and system may comprise sensing a plurality of braking parameters having values dependent upon the wear in the system and different faults of the system, and identifying and recording wear and faults based on combinations of values of the parameters.
30 Citations
16 Claims
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1. A method of monitoring the usage of aircraft brake members having facing friction surfaces, the method comprising:
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detecting each actuation of the brake members; making a separate record of each actuation in which there is relative movement of the facing friction surfaces which causes wear; and determining brake usage from that record, the method of determining relative movement of the facing friction surfaces which causes wear including the steps of; detecting a change in temperature of the brake members on actuation thereof; generating signals according to the detected changes in temperature; twice differentiating said signals and; identifying from said signals actuations of the brake members which cause a change in temperature that is an increase above a pre-selected threshold value by comparing said twice differentiated signals with said pre-selected thereshold value and identifying those actuations that cause a change in temperature that is an increase above said pre-selected threshold value as actuations in which there is relative movement of the facing friction surfaces that causes wear. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. Aircraft brake monitoring apparatus for monitoring usage of aircraft brakes that comprise carbon-carbon multi-discs, said apparatus comprising:
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at least one sensor for sensing a brake output parameter and providing signals indicative of values of the sensed brake output parameter; a differentiator for twice differentiating said signals; a processor for receiving and processing said twice differentiated signals using at least one algorithm to determine when a wear generating application of the brakes has been made; and a store in which a record of each wear generating application is stored. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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Specification