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내진해석 시 응답스펙트럼의 해석시간을 줄이기 위한 방법에 관한 연구
박봉관(Bong Kwan Park),정환석(Hwan Seock Jeong),서성준(Seong Jun Seo),이성형(Mandy Lee),김동균(Calos Kim) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
In order to reduce the analysis time that occurs when performing response spectrum analysis with the mode combination method according to U. S NRC Regulatory Guide 1.92, only modes within 50 Hz are combined. Considering the modal influence of the remaining modes, an alternative to multiplying the zero-period acceleration by 1.5 when the Missing Mass Method is applied was suggested. Analysis is performed for tank that require a long mode combination until the mode where the sum of the total effective mass becomes 90%. In Case A, response spectrum analysis according to U. S NRC Regulatory Guide 1.92 is performed. In Case B, response spectrum analysis is performed with mode combinations up to 50 Hz. In Case C, the response spectrum analysis is performed by the method presented. The analysis time of Case B and Case C was lower than that of Case A. The stress was different for each part of the tank depending on the mode characteristics, and the maximum stress difference between Case A and Case B. The difference of stress between with Case C and Case A was very similar. In case of using the alternative method is used, the analysis time is greatly reduced and the effected for modes after 50 Hz.
내진해석 시 응답스펙트럼의 해석시간을 줄이기 위한 방법에 관한 연구
박봉관(Bong Kwan Park),정환석(Hwan Seock Jeong),서성준(Seong Jun Seo),이성형(Mandy Lee),김동균(Calos Kim) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
In order to reduce the analysis time that occurs when performing response spectrum analysis with the mode combination method according to U. S NRC Regulatory Guide 1.92, only modes within 50 Hz are combined. Considering the modal influence of the remaining modes, an alternative to multiplying the zero-period acceleration by 1.5 when the Missing Mass Method is applied was suggested. Analysis is performed for tank that require a long mode combination until the mode where the sum of the total effective mass becomes 90%. In Case A, response spectrum analysis according to U. S NRC Regulatory Guide 1.92 is performed. In Case B, response spectrum analysis is performed with mode combinations up to 50 Hz. In Case C, the response spectrum analysis is performed by the method presented. The analysis time of Case B and Case C was lower than that of Case A. The stress was different for each part of the tank depending on the mode characteristics, and the maximum stress difference between Case A and Case B. The difference of stress between with Case C and Case A was very similar. In case of using the alternative method is used, the analysis time is greatly reduced and the effected for modes after 50 Hz.
Chae-Sil Kim(김재실),Hoon-Hyung Jung(정훈형),Bong-Kwan Park(박봉관) 한국기계가공학회 2013 한국기계가공학회지 Vol.12 No.6
High speed rotor systems with magnetic bearings have been the subject of much research in recent years due to the potential for active vibration control. In this thesis, optimal design was conducted for an 8-pole heteropolar magnetic bearing used in the flexible rotor of a turbo blower. In connection with bearing stiffness, this optimal design process was conducted using a genetic algorithm(GA), which is based on natural selection and genetics. The maximum stiffness of the magnetic bearing-rotor was found by considering the critical speeds of the flexible rotor. As a result, the magnetic bearings were optimized to have maximum stiffness.