ロケットエンジンの信頼性解析におけるＳｉｘ　Ｓｉｇｍａ手法の導入

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  • Reliability Analysis of a Rocket Engine Using Design for Six Sigma
  • ロケットエンジン ノ シンライセイ カイセキ ニ オケル Six Sigma シュホウ ノ ドウニュウ

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Six Sigma is the management strategy developed by Motorola to reduce defects in products. Design for Six Sigma (DFSS) is a methodology for determining the values of the design parameters, which maximize the performance of some system without tightening the material, manufacturing or environmental tolerances. This paper presents the implementation of DFSS for redesign of the LE-7 engine. Uncertainties with design parameters and operational conditions are considered in evaluating thrust performance, thrust chamber life, turbo-pump cavitation, and combustion stability. Traditional deterministic optimization results and probabilistic optimization results are compared. It is found that robustness of rocket engine is not always consistent with the extension of thrust chamber life.

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