퍼지 拘束條件을 考慮한 回轉軸系의 最適振動設計

Abstract

In general, the dynamic design object of rotor system is to optimize the systems in stability at the operating speed, unbalance resonance in the vicinity of the rotor critical speed, bearing weighing and system weighting, we examine the possibility of resonance and stability for rotating machinery design. A design of rotating shaft is to get a food stability at the operating speed and to minimize Q factor through critical speeds/ In conventional optimization method, designers have to set mathematical modeling, such as objective function, constraints and design parameters, strictly and quantitatively. But in actual design process, they do not treat all of these values strictly and some of them are somehow “fuzziness”. Recently, many studies have been done on fuzzy mathematical programming. In fuzzy non-linear programming, α-level cut method is considered as one of the most popular and useful method. In this paper, considering boundary conditions of seal diameter, seal clearance and seal length is fuzzy, this paper considered fuzziness in constraints. Fuzzy method is used α-level cut method. Then, the optimum dimension of seal are obtained and vibration characteristic are investigated.