107. Weight Estimation of Hydraulic Cylinders for Aircraft


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R P Dodds: 107. Weight Estimation of Hydraulic Cylinders for Aircraft. 1954.



In the preliminary design stage of a new airplane a statistical method has been generally used for estimating hydraulic cylinder assembly weights. This method usually consists of a plot of net weight vs. (bore^2 x retracted length). As more design information is obtained it is felt that the purely statistical approach is inadequate and should be replaced by a semi-rational method that makes use of the new design information.
This semi-rational method is based on the general philosophy expressed by Shanley ref. 1 wherein the weight of a structure is divided into (a) optimum weight, which is the minimum weight of material that will transmit the design loads over the required distances, (b) non-optimum weight or the weight required for cut-outs, splices, joints, connections, standards, production requirements, etc., and (c) secondary weight which in this case is the weight due to design features such as integral locks, integral shuttle valves, swivel ends, or dashpots.
This paper therefore concerns itself with two ideas: (a) a statistical approach for use during the preliminary design phase, and (b) development of a quick, semi-rational method for use during the detail target weight breakdown.


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