12th Plantema memorial lecture: Assessment of service load experience

12th Plantema memorial lecture: Assessment of service load experience

de Jonge, J.B.

National Aerospace Laboratory NLR

1989-03-10

The paper starts with a review of the various types of loading acting on the aircraft structure and our ability to accurately predict their magnitude and frequency of occurrence for a given aircraft usage. Next, attention is paid to the variation in load experience and its causes, with specific reference to the variation in aircraft usage. For transport type aircraft these variations are largely defined by the variation in flight length and payload. For combat type aircraft, on the other hand, the variability is considerably larger and consequently the prediction of load spectra considerably more difficult. For the assessment of actual service load spectra, operational flight load measurements and/or service usage monitoring are required. The rapid development of electronics during the last decades has opened the possibility for advanced processor based service fatigue load monitoring systems at relatively low price. However, it will be argued that specifically for transport aircraft simple usage monitoring may already provide highly relevant information. For combat type aircraft, the determination of average "mission type" spectra from in flight multiparameter recordings, in combination with mission usage monitoring for individual airplane tracking appears to be an adequate solution.

http://resolver.tudelft.nl/uuid:7c8c83d0-0734-4d4a-96d4-9996f0058a95

Nationaal Lucht- en Ruimtevaartlaboratorium

Campus only

NLR Technical Publication TP 89097 L

Aerospace Engineering Reports

report

(c) 1989 National Aerospace Laboratory NLR