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FRF 기반 부분구조합성법을 이용한 차량 진동성능 강건설계
원영우(Young-Woo Won),이두호(Dooho Lee) 한국소음진동공학회 2022 한국소음진동공학회 논문집 Vol.32 No.2
In this study, a robust design procedure using the FRF-based substructuring (FBS) method was proposed for vehicle vibration performance. In the robust design procedure, global sensitivity analysis was used to obtain the design information of elastomers in structural systems considering uncertainties. The global sensitivity method combines the random balance design method for variance-based sensitivity information and the FRF-based substructuring (FBS) method for the calculation of vibrational responses, which establishes an efficient tool even in complex real structures. Moreover, a multi-objective optimization formulation was applied to obtain the optimal design of elastomers that give robust vibration responses. The objective functions were set to the mean and variance of the vibration responses. The Pareto optimal front was calculated using the non-dominated sorting genetic algorithm-II (NSGA-II). The genetic algorithm design variables were screened using the global sensitivity analysis results for the elastomers. These formulations were applied to a passenger car problem to obtain the optimal design of the engine mount systems. The numerical results showed that the newly introduced feature enhanced the calculation performance and the proposed procedure can be applied successfully in real complex structural problems.
이두호(Dooho Lee),원영우(Young-Woo Won) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.4
Plug-In Digital Framework (PIDF) is a system response analysis tool when the system components are composed of black-box modules. In the PIDF, it is crucial to identify the contributions of each substructure on a system response, but the system information (i.e. geometry, material properties ets.) of substructural component is hidden in the PIDF in the form of frequency response functions due to security issues. In this study, we introduced a global sensitivity analysis procedure for substructural components under the PIDF. We assumed that the FRF-based substructuring method provides points, the changes of the substructural FRF matrix were estimated using the first order approximations. Using the random balance designs (RBD), system responses were generated and the global first-order sensitivities of each substructure were estimated. The proposed global sensitivity analysis method were applied to an interior noise problem of a passenger car and the efficiency of the global sensitivity analysis method was evaluated.
플러그인 디지털 프레임웍을 위한 연결부 전역민감도 해석
이두호(Dooho Lee),원영우(Young-Woo Won),권종현(Jong-Hyun Kwon) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Plug-In Digital Framework is a system response analysis tool when the system components are composed of blackbox modules. Generally, the dynamic characteristics of joints between the system components affect largely on system responses, and have displacement- and frequency-dependent stiffness and loss factor. Thus, the sensitivity of each joint parameters should be estimated in global sense. In this study, we introduce a global sensitivity analysis procedure under the Plug-In Digital Framework. To efficiently calculate the system responses, the FRF-based substructuring method is introduced. Using the random balance designs (RBD) system responses are generated and the global first-order sensitivities of each joint stiffness are estimated. The proposed global sensitivity analysis method are applied to an interior noise problem of a passenger car and the efficiency of the global sensitivity analysis method is evaluated.
플러그인 디지털 프레임웍을 위한 연결부 전역민감도 해석
이두호(Dooho Lee),원영우(Young-Woo Won),권종현(Jong-Hyun Kwon) 대한기계학회 2016 大韓機械學會論文集A Vol.40 No.5
플러그인 디지털 프레임웍은 계의 구성요소가 블랙박스 형태로 구성되어 있을 때 계의 응답을 해석하는 도구이다. 일반적으로 구성요소를 연결하는 동역학계의 연결부는 계의 응답에 크게 영향을 미치게 되고, 많은 경우 연결부의 특성은 변위와 주파수에 따라 달라지는 특성을 보인다. 그러므로 연결부의 특성에 대한 민감도의 계산은 전역적으로 수행되어야 한다. 본 연구에서는 플러그인 디지털 프레임 웍에서 연결부의 전역민감도를 계산하는 방법을 주파수응답함수 기반의 부분구조합성법을 기반으로 제시한다. 일차 전역민감도는 무작위균형설계법을 이용하여 적은 수의 샘플링으로 각 인자영향을 계산할 수 있다. 이 방법은 승용차의 실내소음에 대한 각 연결부 강성의 민감도를 계산하는 예에 적용함으로써 그 효용성을 검증하였다. Plug-In Digital Framework is a system response analysis tool that is employed when system components are composed of black-box modules. Generally, the dynamic characteristics of joints between the system components significantly affect system responses, and they lead to displacement- and frequency-dependent stiffness and loss factor. Thus, the sensitivity of each joint parameters should be estimated from a global perspective. In this study, we introduce a global sensitivity analysis procedure under the Plug-In Digital Framework. To efficiently calculate the system responses, we introduce the frequency response function (FRF)-based substructuring method. Using the random balance designs (RBD), we generate the system responses and estimate the global first-order sensitivities for each joint stiffness. We apply the proposed global sensitivity analysis method to an interior noise problem of a passenger car, and we evaluate the efficiency of the global sensitivity analysis method.