Method for evaluating measured values for identifying a...

Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Mechanical measurement system

Reexamination Certificate

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C073S795000

Reexamination Certificate

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07930112

ABSTRACT:
In a method of evaluating measured values for recognizing defect conditions due to material fatigue on aircraft parts, strain sensors (6) are applied on the critical locations of an aircraft (1) and measured values of outputs of the strain sensors are detected at different loading conditions, amplified and stored through several measuring circuits. An evaluating apparatus (9) derives, signals or indicates a material fatigue by comparison of current measured values with previous measured values. The critical aircraft parts (1) are impinged on with prescribed loading conditions by loading elements (3). The strain effect caused thereby is detected by measuring circuits. The evaluating apparatus (9) forms, for at least each loading condition and each measuring circuit, an allocated reference value and a permissible limit value range. If current measured values exceed the limit value range, this represents a material fatigue manifestation.

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Simpson et al., The canadian and Australian F/A-18 International Follow-On Structural Test Project, ICAS 2002 Congress, 17 pp.
23rd Congress of International Council of the Aeronautical Sciences, Sep. 8-13, 2002, Toronto, Canada, Paper ICAS 2002-0.6, 1 page.

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