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자동차용 칵핏의 모듈 단위에서 발생되는 Rattle 소음의 특성에 대한 시험적 고찰
이철현(Chulhyun Yi),양정민(Jeongmin Yang),조진호(Jinho Cho),이원구(Wonku Lee),정현주(Hyeonju Jeong) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
In this paper, among the indoor component of a vehicle, and is obtained by experimentally studied Rattle characteristics of the vibration and noise of the noise is a typical joints generated through the evaluation of the cockpit module units. Was constructed a profile used to perform the evaluation of these vehicle cockpit module units. The profile is measured vibration characteristics of the running conditions of the cockpit module is mounted on the actual vehicle, for the progress of the evaluation is performed by each module, and measured natural frequency to reflect the characteristics, structure was. And using the configuration profile, and the noise to about that is sporadically generated yet locally in the cockpit module to configure a list of the noise generated through subjective evaluation of the subject, the objective for the location I was using the visualization device. Was measured proximity noise and surface speed of the Rattle noise occurrence position of which is being grasped by the visualization results.
모듈 단위 열화조건을 고려한 자동차용 칵핏 모듈 이음(BSR Noise)에 대한 시험적 고찰
이철현(Chulhyun Yi),양정민(Jeongmin Yang),조진호(Jinho Cho),이원구(Wonku Lee),우창수(Changsu Woo) 한국소음진동공학회 2014 한국소음진동공학회 학술대회논문집 Vol.2014 No.10
In this paper, in order to impart the aging condition of the parts, by configuring the cycle of temperature from low temperature was performed by applying the aging conditions for vehicle cockpit module. The reason for the selected modules of the cockpit vehicle parts, because the joint occurrence typical components of the room component is a first module and ceiling cockpit module. After setting the excitation profile using the BSR exciter only that this is for the module degradation after the initial and grasp the change in the dynamic characteristics of the modules based on the before and after deterioration may be made in the module, grasp the noise generating position I measured the noise and proximity. Was also visualized on the position of the joint is generated using a sound camera to objective results occurring where the joint is selected through subjective evaluation.
자동차용 칵핏 모듈의 이음(BSR Noise) 재현을 위한 시험적 고찰
이철현(Chulhyun Yi),양정민(Jeongmin Yang),조진호(Jinho Cho),이원구(Wonku Lee),우창수(Changsu Woo),최재민(Jaemin Choi) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
Among the Vehicle components, BSR Noise generating components typical is the first module of the headlining and cockpit modules. In this paper, among the BSR Noise generating components typical, I studied the way of visualization and reproduction of BSR Noise generated in the cockpit module. BSR Noise evaluation method in the component units of the existing, BSR Noise Measuring the excitation forces are using the jig with the caliber of the dedicated attached in an actual car, and constitutes a profile of the excitation force for each frequency, I was using the method that is input to the caliber of the BSR Noise only. In this study, the dynamic of the cockpit module of profiles that are conventionally used I have configured the signal that reflects the characteristic frequency. For component using a profile that is configured as described above It has to measure the proximity and noise figure of BSR Noise generation position throughout the test"s subjective assessment, the noise visualization using sound camera Was objectively the results of noise generation position of the subjective assessment by proceeding.
온도범위에 따른 비침습적 자기공명 온도측정방법의 최적화
김종민,조영승,김정희,이철현,오창현,Kim, Jong-Min,Kumar, Suchit,Jo, Young-Seung,Park, Joshua Haekyun,Kim, Jeong-Hee,Lee, Chulhyun,Oh, Chang-Hyun 대한의용생체공학회 2015 의공학회지 Vol.36 No.6
Noninvasive temperature monitoring is feasible with Magnetic Resonance Imaging (MRI) based on temperature sensitive MR parameters such as $T_1$ and $T_2$ relaxation times, Proton Resonance Frequency shift (PRFs), diffusion, exchange process, magnetization transfer contrast, chemical exchange saturation transfer, etc. While the temperature monitoring is very useful to guide the thermal treatment such as RF hyperthermia or thermal ablation, the optimization of the MR thermometry method is essential because the range of temperature measurement depends on the choice of the measurement methods. Useful temperature range depends on the purpose of treatment methods, for example, $42^{\circ}C$ to $45^{\circ}C$ for RF hyperthermia and over $50^{\circ}C$ for thermal ablation. In this paper, MR thermometry methods using $T_1$ and $T_2$ relaxation times and PRFs-based MR thermometry are tried on a 3.0 T MRI system and their results are reported and compared. In addition, the scanning protocol and temperature calculation algorithms from $T_1$ and $T_2$ relaxation times and PRFs are optimized for the different temperature ranges for the purpose of RF hyperthermia and/or thermal ablation.
자동차 칵핏 모듈용 시편 소재의 열화 조건을 고려한 이음(Rattle) 발생 특성에 관한 시험적 고찰
양정민(Jeongmin Yang),이철현(Chulhyun Yi),조진호(Jinho Cho),이원구(Wonku Lee),우창수(Changsu Woo) 한국소음진동공학회 2014 한국소음진동공학회 학술대회논문집 Vol.2014 No.10
It is treated more seriously than ever as the customer requirements are becoming a high-quality and diversification. Among the various elements to affect customers evaluation of automobile quality, BSR(buzz, squeak, rattle noise) are considered to be a mostly contributing factor. Rattle Noises in cockpit modules are one of the major concerns mentioned above. Recently, measurements of the BSR noise between the parts that make up the products from the perspective that the structural causes. For structures that make up material has not been any consideration of the BSR noise characteristics. The aim of this study is to clarify the characteristics of noise occurrence in vehicle cockpit module that consist of plastic material after measuring noise by rattle special testing instrument.
3년간의 피지컬 컴퓨팅 기반의 STEAM 프로그램의 효과 비교 연구
김석희 ( Sughee Kim ),이철현 ( Chulhyun Lee ) 한국컴퓨터교육학회 2016 컴퓨터교육학회 논문지 Vol.19 No.1
2011년부터 본격적으로 도입되기 시작한 융합인재교육은 2009개정 교육과정에 과학교과에 반영되기 이르렀다. 그러나 이러한 상황은 학문적 연구 성과에 기인하기 보다는 정책적으로 결정된 측면이 크다. 그러므로 융합인재교육에 대한 실천적 효과에 대한 연구가 요구된다. 본 연구자는 2012년부터 2014년까지 초등학교 4학년생들에게 피지컬 컴퓨팅 기반의 스팀 교육 프로그램을 구안하여 적용하였다. 효과를 연구하기 위해 과학적 태도, 과학적 문제해결력, 청소년 심리검사, 논리적 문제 해결력, 학교 교육과정만족도 등의 검사를 사전, 사후로 나누어 실시하였다. 그 결과 과학적 태도, 논리적 문제 해결력, 교육과정 만족도는 3년간 유의미한 효과가 있는 것으로 나타났다. 이러한 연구 결과는 스팀교육의 도입된 필요성인 학업성취도에 비해 낮은 과학에 대한 흥미와 호기심을 키우는데 스팀교육의 필요성을 확인하는 결과라고 할수 있다. 본 연구를 통해 컴퓨팅 기반의 스팀 프로그램은 과학적 태도, 논리적 문제 해결력, 학교 만족도등에 영향을 미친다는 결론을 얻을 수 있었다. STEAM education introduced full-scale since 2011, it was reflected in the 2009 modified science curriculum. Partially it was decided not by result of study, but by the government policy. So practical study was needed for steam education. The researchers have studied effect of steam education based on physical computing from 2012 to 2014 on fourth grader. To study of effects of steam education, the researcher administer pre-to-post of science attitude test, science achievement test, logical ability test, psychological test for youth, satisfaction level test for school curriculum. The result shows that science attitude, logical ability, and satisfaction level for school curriculum of steam treatment group were enhanced. We conclude that steam education solve the proposed problem which low motivation and interest for science in comparison with science achievement.
파워기반 소음감소 기법을 이용한 준중형 해치백 후석 고주파성 로드노이즈 전달특성 연구
이종현,조세현,이주완,이철현,양정민,Lee, Jonghyun,Cho, Sehyun,Yi, Juwan,Lee, Chulhyun,Yang, Jungmin 한국음향학회 2018 韓國音響學會誌 Vol.37 No.4
세단 타입에 비해 해치백 타입의 차량은 실링구조 확보에 어려움이 있기 때문에 후석에서 느껴지는 차폐성능이 열세한 것으로 알려져 있다. 차량의 차폐감 확보를 위해 강건한 실링 시스템과 충분한 흡음/차음 성능이 요구되지만 준중형 이하 세그먼트에서는 원가, 중량의 제약으로 인해 충분한 흡차음 사양 적용에 제한을 받고있어 효율적인 흡차음 사양의 적용이 요구되고 있는 실정이다. 본 연구에서는 정량적인 측정과 비교, 분석이 가능한 파워기반 소음감소(Power Based Noise Reduction, PBNR) 기반의 차음 윈도우 평가를 통해 준중형 해치백 차량의 후석 소음원의 전달 경로를 분석하고 후석 차폐성능 확보를 위한 흡차음 대안을 제시하였다. It is known that the road noise on the rear seat of a hatchback type car is worse than that of a sedan type car because of the weakness on sealing structure. Therefore, a sound sealing system and sufficient absorption/insulation performance are required. In the case of a compact segment car, however, the application of the sufficient absorption and insulation materials is limited, because of the restriction on the production cost and weight of the car. In this study, we estimate the noise transmission path on the vehicle's body structure from tires and ground using the PBNR (Power Based Noise Reduction) method which is useful in quantitative measurement. Based on these results, we suggest an alternative absorption/insulation method for the better performance of rear seat road noise reduction in a compact hatchback car.
패키지트레이 차일드앵커 커버의 래틀 소음 개선을 위한 실험적 연구
양정민(Jeongmin Yang),이철현(Chulhyun Yi),이상익(Sangik Lee),도현철(Hyuncheol Do),김영환(Younghwan Kim) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
Increasing amount of automotive technological innovation is driving manufactures to strengthen their NVH performance than ever before. To effectively test and evaluate NVH performance of automotive parts many NVH measuring techniques are under development. One of which is testing for BSR noise. BSR is induced by micro-interactions between vibrating automotive parts that cause discomforting noise to the driver. Unlike NVH issues, due to its intermittent behavior of BSR noise, the best approach to manage BSR is to eliminate its source than try to decrease its noise level. The BSR improvement discussed in this paper is about BSR noise becoming apparent after changing the design of child anchor attached to the package tray. Functionally the part had no problem, yet rattle noise had been developed over time. This paper proposes analyzing and eliminating the problematic noise source through experimental study to enhance noise performance.