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시변환 스트레스 조건에서의 와이블 분포의 모수 및 가속 모수에 대한 베이시안 추정을 사용하는 이산 시간 접근 방법
정인승(In-Seung Chung) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
This paper suggests a method using Bayesian inference to estimate the parameters of Weibull distribution and acceleration parameters under the condition that the stresses are time-dependent functions. A Bayesian model based on the discrete time approximation is formulated to infer the parameters of interest from the failure data of the virtual tests and a statistical analysis is considered to decide the most probable mean values of the parameters for reasoning of the failure data.
이산 시간 접근 방법을 사용하는 2 개의 직렬계 비동일 부품 고장의 와이블 분포 모수의 베이시안 추정에 대한 타당성 조사
정인승(In-Seung Chung) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.10
This paper investigates the feasibility of the Bayesian discrete time approximation method to estimate the parameters of Weibull distributions of failures for two non-identical components connected in series system. A Bayesian model based on the discrete time approximation method is formulated to infer the Weibull parameters of two non-identical components with the failure data of the virtual tests. The study of this paper comes to a conclusion that the method is feasible only for some special cases under the given constraints on the concerned parameters.
이산 시간 접근 방법을 사용하는 2개의 직렬계 비동일 부품 고장의 와이블 분포 모수의 베이시안 추정에 대한 타당성 조사
정인승(In-Seung Chung) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
This paper investigates the feasibility of the Bayesian discrete time approximation method to estimate the parameters of Weibull distributions of failures for two non-identical components connected in series system. A Bayesian model based on the discrete time approximation method is formulated to infer the Weibull parameters of two non-identical components with the failure data of the virtual tests. The study of this paper comes to a conclusion that the method is feasible only for some special cases under the given constraints on the concerned parameters.
모달중첩법을 이용한 ESC 어셈블리용 브라켓의 피로수명평가
이정환(Jung-Hwan Lee),김승중(Seung-Joong Kim),한민규(Min-Gyu Han),장세인(Sane Chang),정인승(In-Seung Chung) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
It is well known that the ESC (electronic stability control) system plays an important role in vehicle safety. In general, the structural integrity of ESC system should be assured over 10 years. This is because the fatigue life evaluation for ESC system under service loading is required. The purpose of this study is to find an appropriate condition of structural damping coefficient for frequency response analysis and to evaluate the fatigue life of a bracket for ESC assembly by using modal superposition method. To verify the results from fatigue analysis, an experiment was conducted under the same condition as numerical simulation, and their results were compared.
전동식 조향 장치용 ECU 의 환경 내구 시험 시간 단축을 위한 설계 검증 시험 사양 변경 사례
김태훈(Tae-Hun Kim),강동영(Dong-Young Kang),정인승(In-Seung Chung) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
This paper suggests an example of modification of the durability test specifications of electronic control unit for an automotive system in phase of design validation. The basic concept to redefine the specifications of durability test is based on the Arrhenius relationship for accelerated temperature test and the modified Coffin-Manson model for temperature cycle test. The ambient temperature of the powered-event durability test is increased to reduce the required test time of the current specification. Furthermore, the holding time between the events to cool down the temperature of the components is shortened and the resultant temperature rise affects the durability of the components. Thus, the acceleration factor due to the increased temperature range of temperature cycle is also estimated by the modified Coffin-Manson model.