Avionic systems design- stability derivatives, Other Engineering

The idea of stability derivatives is to approximate the general functional relationship between any force ormoment variable and the dynamic or control variables as a Taylor series expansion of the perturbation (i.e.small changes) about a trimmed flight condition. In non mathematical terms this simply means that weassume that we can approximate the functional relationship of the perturbation as a linear combinationof of the dynamic variables and control variables with the coeficients of these termed aerodynamicderivatives. Thus for example the perturbation z of the vertical force Z is expressed in terms of theperturbations of dynamic variables u, uw, w etc. and control variable terms such as due to the elevator

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where the partial derivative coeficients are assumed constant at each particular flight condition. 

 

Posted Date: 8/27/2012 3:41:17 AM | Location : United States







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