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허덕재,장한기 한국소음진동공학회 1996 소음 진동 Vol.6 No.3
본 글에서는 대형차량의 엔진 마운트 과정과 마운트 설계시 필요한 사항들에 대하여 간략히 정리해 보았다. 먼저 2장에서는 비교적 형상이 간단한 대형 차량의 마운트 강성을 정확히 설계하는 과정을 제시하였는데, 이 방법에 따라 아운트 재질에 대한 탄성계수를 데이터 베이스화 함으로써 다양한 경우에 원하는 특성을 갖는 마운트를 쉽게 설계할 수 있음을 보였다. 3장에서는 마운팅 설계를 위한 기초 데이터 -관성특성 및 가진력 등에 대하여 기술하였으며, 4장에서는 마운트 최적 설계과정을 정리하였다. 여기서 마운트의 강성을 선정하는 방법과 프레임의 유연성이 엔진 동특성에 미치는 영향을 고찰 최적화하는 과정을 기술하였다. 또한 시혐적 검토에 의한 평가방법을 5장에서 서술함으로 일반적인 엔진 마운트에서의 최적 설계에 대한 내용을 서술하였다.
허덕재,조연,김희석,이근수,박태원 한국소음진동공학회 2000 소음 진동 Vol.10 No.2
the reduction of the interior nosie level has been the main interest of NVH engineers in the development of vehicles. However, the consumer's perception on the car noise is affected largely by the psychoacoustic characteristics of the noise, as well as the sound pressure level. In this study, the quality of the vehicle interior nosie is analyzed by employing the subjective evaluations and by representing them in temrs of the objective quantities. The subjective evaluatins were performed for the seven vehicles in the range of subcompact to luxury cars. The methods of paired comparisons and semantic differential were used to study the preference, the quality of interior noise and their correlation. The linear regression models were obtained for the subjective evaluation and the sound quality metrics.
모드해석을 이용한 L, T 자형 구조물의 결합 강성 평가 방법에 대한 연구
허덕재,정재엽,조연,박태원 한국소음진동공학회 1999 소음 진동 Vol.9 No.5
This paper describes the dynamic characteristics of the joint structures in case of using the simplified beam model in the F. E. analysis. The modeling errors, when replace the shell with the beam, are investigated through F. E. normal modes analysis. Normal mode analysis were performed to obtain the natural frequencies of the L and T shaped joints with various type of channels. The results were analyzed to access the effects of the models on the accuracy of F.E. analysis by identifying the geometric factors which cause the error. The geometric factors considered are joint angle, channel length, thickness and area ratio of the hollow section to the filled one. The joint stiffness evaluation technique is developed in this study using normal modes analysis with Lumped Mass. With this method, the progressively improved results of F. E. analysis are obtained using the simplified beam model. The static and normal modes analysis are performed with the joint stiffness values obtained by the Kazunori Shimonkakis' virtual stiffness method and the proposed method and these simplified modeling errors are compared.
주파수응답함수의 부분구조합성 법을 이용한 차 실내소음 예측
허덕재,박태원 한국소음진동공학회 2001 한국소음진동공학회 논문집 Vol.11 No.4
This paper presents the simulation methodology of the interior noise of vehicle using the frequency response function based hybrid modeling of the system which consists of multi-subsystem models obtained by the test or analysis. The complex systems such as a trimmed body of high modal density and a powertrain were modeled by using experimental data, and a sub-frame of a vehicle of low modal density was modeled by finite element data. Modeling of the whole system was executed and validated in the two stages. The first stave is combining the trimmed body and the sub-frame, and the second stage is attaching the powertrain, which is a exciting source, to the combined model of the first stage. The input force to the system was modeled as an equivalent force in the virtual space, which was obtained from impedance method using the FRFs of the powertrain and the responses. The interior noise predicted by the proposed method was very close to the direct measurement, which showed feasibility of the proposed modeling procedure. Since the methodology is easily applied to both the transfer path analysis of structure-borne noise and the analysis of noise contribution of a sub-system, it is expected to be a strong tool for design change of a vehicle in the earlier stare.
CAE를 이용한 대형 상용차 배기계의 구조적 특성에 관한 연구
허덕재(Deog-Jae Hur),김병곤(Byoung-Gon Kim),최석환(Seok-Hwan Choi) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this study. a CAE techinique is developed in order to identify and optimize the characteristics of a heavy truck exhaust system. Under the given three loading conditions. the strength is investigated through static stress analysis along with parameter optimization. The dynamic performance is also evaluated by modal analysis. For the simplification and idealization of bellows in F. E. model. three ways of modeling techique are attempted and the results are compared.<br/>
수평 착자형 액추에이터의 전자기력 성능 향상에 관한 연구
허덕재(Deog Jae Hur),이재혁(Jai Hyuk Lee),권상엽(Sang Youp Kwon),이성수(Sung Su Lee) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
This paper describes optimization design to improve the performance of bandwidth and the maximum acceleration of the linear AC vibrator with horizontal magnetization. The variable was set the electromagnetic force of the exciting force of the haptic vibrator. Optimization in horizontal magnetization design leads the maximum electromagnetic force when the permanent magnet and coil are centrally aligned. In addition, when increasing the width and height of magnet, the electromagnetic force has increased also. The final optimized design is applied with the parameter combination, and the electromagnetic force has risen about 81.4% compared to the previous model.