3154. Electrical Power Generation and Distribution System Estimation


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Robert M. Bond: 3154. Electrical Power Generation and Distribution System Estimation. 2001.



It is important to be able to influence the design of aircraft electrical systems in the definition phase. This makes it possible to influence weight at a lower cost than is possible in the design or production phases. A method is described that synthesizes an approximate part-level design from a combination of airplane level configuration data, fundamental engineering theory, cross-functional design/analysis practices, and refinement of results as more detailed real data becomes available. Automated knowledge based engineering (KBE) up front provides the initial characterization of the electrical system.
Electrical power generation and distribution system designs are evaluated from five viewpoints. These are weight, body station center of gravity, dependability cost, reliability, and maintainability. Calculation of multiple attributes allows rapid trade study capability using a variety of measures. This cuts cycle time in the risk assessment process. This software tool is useful to both weights and electrical power system engineers.
Sizing generation-associated components relies upon data extracted from the loads and architecture modules. The load module dictates the required capacities and the architecture module specifies the quantities of the various components.
Feeder wire sizing involves determination of feeder heating effects as a function of current, altitude, ambient temperature of the feeder’s location, wire type, and bundle configuration derating. System voltage distortion due to harmonics is estimated as a function of frequency.
The method is user friendly, robust, and documented in an understandable manner. Default values for all parameters are constructed from two inputs: number of engines and maximum take-off weight. An on-line help function is provided and includes a feature that displays all equations used in the calculations. Detailed weight and body station center of gravity reports are provided in several formats.


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