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aerodarmofal2005aerodynmaics100

aerodarmofal2005aerodynmaics100 - Sensitivity Analysis...

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Sensitivity Analysis Often in engineering analysis, we are not only interested in predicting the performance of a vehicle, product, etc, but we are also concerned with the sensitivity of the predicted performance to changes in the design and/or errors in the analysis. The quantification of the sensitivity to these sources of variability is called sensitivity analysis . Let’s make this more concrete using an example. Suppose we are interested in predicting the take off distance of an aircraft. From Anderson’s, Intro. To Flight, an estimate for take-off distance is given by Eqn (6.104): 7 f max 2 44 . 1 L LO SC g W S U To make the example concrete, let’s consider the jet aircraft CJ-1 described by Anderson. In that case, the conditions were: 0 . 1 19815 7300 / 2 . 32 @ / 002377 . 0 318 max 2 3 2 f L C lbs W lbs T s ft g level sea ft slugs ft S U Thus, under these “nominal” conditions: + , + ,+ ,+ ,+ ,+ , 7300 0 . 1 318 002377 . 0 2 . 32 19815 44 . 1 2 LO S ft S LO 3182 @ nominal conditions Suppose that we were not confident of the value and suspected that it might be ±0.1 from nominal.
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