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Ladle 내에서 기포에 따른 액상 영역의 유동학적 특성에 관한 가시적 연구
오율권,서동표,양호동 조선대학교 에너지.자원신기술연구소 2004 에너지·자원신기술연구소 논문지 Vol.26 No.2
In the present study, the gas injection system based on air-water model was designed to investigate the fluid-dynamics characteristics of liquid zone into a ladle. PIV system and camera techniques were applied to analysis flow patterns at the liquid zone. Gas flow rate is one of most important factors which could feature a flow pattern in a gas injection system. At low gas flow rate, upward bubble flow induced by buoyancy force is predominant and does not make an impact on mixing due to a weak circulation flow. However, with increasing gas flow rate, the kinetic energy of bubble increases and a strong circulation flow develops in the liquid. Such a flow in the liquid develops vortex and improve the mixing process. Due to the centrifugal force, circulation flow was well developed near both wall sides and upper region respectively.
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.
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.
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.