Procedure for the prognostic of a structure subject to loads
First Claim
1. A method for prognostics of a structure subject to loads, particularly an aircraft structure, comprising performing on a processor the steps of:
- providing a first database linking possible loads acting on the structure in operating conditions with a modified state of the structure, including values of a quantity indicative of the state of the structure as modified in the presence of said loads in a predetermined number of relevant points;
providing a second database linking changes of the state of the structure induced by pre-established defects in a predetermined number of relevant points of the structure, with possible classes of defects; and
,iteratively;
detecting the values of said quantity indicative of the state of the structure in a first plurality of primary detection points and in a second plurality of additional detection points;
determining from the first database the loads acting on the structure starting from the detected values of the state quantity;
estimating, based on the determined loads, the values of the state quantity in the additional detection points;
whereincomparing between the estimated values and detected values of the state quantity in the additional detection points;
wherein a condition of integrity of the structure is determined if the difference between the detected values and the estimated values of the state quantity in the additional detection points are within a predetermined tolerance, and a condition of defectiveness of the structure is determined if the differences between the detected values and the estimated values of the state quantity are outside a predetermined tolerance.
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Accused Products
Abstract
A method for prognostics of a structure subject to loads, particularly an aircraft structure, includes, detecting the state (strains) of the structure at multiple primary points and additional points. The loads acting on the structure associated with the state detected in the primary points are determined. Based on the determined loads, the state of the structure in the additional points is estimated. The estimated state of the structure is compared with the state detected in the additional points. A soundness state of the structure is assessed if the estimated and detected values of the state quantity are in agreement, or a defectiveness state of the structure if such values differ.
8 Citations
14 Claims
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1. A method for prognostics of a structure subject to loads, particularly an aircraft structure, comprising performing on a processor the steps of:
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providing a first database linking possible loads acting on the structure in operating conditions with a modified state of the structure, including values of a quantity indicative of the state of the structure as modified in the presence of said loads in a predetermined number of relevant points; providing a second database linking changes of the state of the structure induced by pre-established defects in a predetermined number of relevant points of the structure, with possible classes of defects; and
,iteratively; detecting the values of said quantity indicative of the state of the structure in a first plurality of primary detection points and in a second plurality of additional detection points; determining from the first database the loads acting on the structure starting from the detected values of the state quantity; estimating, based on the determined loads, the values of the state quantity in the additional detection points;
whereincomparing between the estimated values and detected values of the state quantity in the additional detection points; wherein a condition of integrity of the structure is determined if the difference between the detected values and the estimated values of the state quantity in the additional detection points are within a predetermined tolerance, and a condition of defectiveness of the structure is determined if the differences between the detected values and the estimated values of the state quantity are outside a predetermined tolerance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for prognostics of a structure subject to loads, particularly an aircraft structure, comprising:
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a first and a second plurality of detection sensors, located in primary detection points and additional comparison detection points, respectively; first storage comprising a first database linking possible loads acting on the structure in operating conditions with a modified state of the structure, including values of a quantity indicative of the state of the structure as modified in the presence of said loads in a predetermined number of relevant points; second storage comprising a second database linking changes of the state of the structure induced by pre-established defects in a predetermined number of relevant points of the structure, with possible classes of defects; and a processor configured for iteratively; detecting the values of said quantity indicative of the state of the structure in a first plurality of primary detection points and in a second plurality of additional detection points; determining from the first database the loads acting on the structure starting from the detected values of the state quantity; estimating, based on the determined loads, the values of the state quantity in the additional detection points;
whereincomparing between the estimated values and detected values of the state quantity in the additional detection points; determining a condition of integrity of the structure if the difference between the detected values and the estimated values of the state quantity in the additional detection points are within a predetermined tolerance, and determining a condition of defectiveness of the structure if the differences between the detected values and the estimated values of the state quantity are outside a predetermined tolerance. - View Dependent Claims (12, 13, 14)
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Specification