2089. Finite Element Model Weight Estimation
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Paper
Abstract
Weight is a primary criterion of aircraft performance and is frequently used as the basis for estimating aircraft cost. Weight and cost of future aircraft will be influenced by changes in design requirements and by new technologies incorporated to meet the goals set by our customers. To control and optimize the weight of aircraft structure and reduce cost, estimation procedures must be developed to reflect the weight effects of new materials and innovative configurations. This requires that weight estimation be performed at greater levels of detail than conventional weight estimation methods. The finite element model (FEM) is well suited for such detailed studies. This paper presents the technology MCAIR is developing to estimate weight from the structural FEM and distribute both structural and non-structural weight back into the FEM. Ibis technology is providing the capability to estimate and control the weight of detail parts such as individual spars, ribs, and skins. FEM weight estimates also reflect the weight impact of configuration details included in the model such as spar spacing, material properties, and construction techniques. The weight estimate can be distributed back into the FEM so that inertial loads, mode shapes, natural frequencies, flutter, and divergence speed can be calculated more accurately.
