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김완두(Kim Wan-Doo),허신(Hur Shin),김석원(Kim Suk-Won),김영구(Kim Young-Gu) 한국철도학회 2000 한국철도학회 학술발표대회논문집 Vol.- No.-
An air spring which is a part of the railroad vehicle suspension system is used to reduce and absorb the vibration and the noise. Main components of the air spring are a cord reinforced rubber bellows, a upper plate, a lower plate and a stopper rubber spring. The characteristics of the air spring which are the load capacity, the vertical and the horizontal stiffness are depended on the configuration of rubber bellows, the angle of cord and the mechanical properties of cord. The computer simulation using commercial finite element analysis codes are executed to predict and evaluate the load capacity and the stiffness. The appropriate shape and cord angle of the air spring are selected to adjust the required performance of the air spring. Several samples of the air spring are manufactured and experimented. It is shown that the results by computer simulation are in close agreement with the test results.
김완두(Kim Wan-Doo),최병의(Choi Byung-Ik),한승우(Han Seung-Woo),김정훈(Kim Jung -Hoon) 한국자동차공학회 1993 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
To enhance the strength of gears for transmission. generally caburizing heat treatments is applied. But there are some problems in this technology - the distortion of gears during heat treatment process.<br/> and the discontinuity of manufacturing process. For these reasons, the high frequency induction hardening process is widely used. This method is one of the surface hardening process to improve<br/> the wear resistance and fatigue life of the machine components.<br/> In this study, to compare the bending fatigue strength of caburized gear with that of induction hardened gear, bending fatigue testing of gears with two different cases was performed by using an electrohydraulic servo-controlled fatigue testing machine and double tooth bending fatigue test fixture.<br/> Fatigue life distributions at constant stress levels were established directly from fatigue data. For gear design, the fatigue strength distribution at specified life is more important. To obtain the fatigue strength distribution, fatigue life distribution was transformed statistically. Reliability of bending fatigue strength was estimated by P-S-N curves and Weibull distribution.<br/>
김완두(Wan-Doo Kim),허신(Shin Hur),이학주(Hak-Joo Lee),김석원(Suk-Won Kim),김영구(Young-Gu Kim) 한국철도학회 2000 철도저널 Vol.3 No.3
An air spring which is a part of the railroad vehicle suspension system is used to reduce and absorb the vibration and the noise. Main components of the air spring are a cord reinforced rubber bellows, a upper plate, a lower plate and a stopper rubber spring. The characteristics of the air spring which are the load capacity, the vertical and the horizontal stiffness are determined by the configuration of the rubber bellows, the angle of cord, and the mechanical properties of cord. Computer simulations using a commercial finite element analysis codes are executed to predict and evaluate the load capacity and the stiffness. The appropriate shape and cord angle of the air spring are selected to meet the required specifications of the air spring. Several samples of the air spring are manufactured and experimentally evaluated. It is shown that the results by computer simulation are in close agreement with the test results.
김완두(Wan Doo Kim) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
The ball bearing with thin-section raceways which is much lighter than other conventional bearings is used in most modern passenger cars and small trucks. The important design parameters of this bearing is the groove radius of raceways, the diametral clearance, the free contact angle and so on. The optimal value of these parameters were determined considering the dynamic load capacity, the contact angle and the calculated fatigue life. The contact angle of a ball and raceways was calculated by considering the local contact deformation and the structural deformation of thin-section raceways which was estimated by FEM. The raceway was made by means of the press-forming process. The fatigue life test were executed and the reliability of this bearing was confirmed.<br/>
김완두(Wan Doo Kim),조성도성(Seong Do Seong Cho) 한국고무학회 2000 엘라스토머 및 콤포지트 Vol.35 No.1
N/A A rubber diaphragm is a critical element of accumulators. The material of a diaphragm is nitrite rubber so as to recover and adjust the large deformation under external pressure fluctuation. The performance of accumulators is influenced by the deformation behaviors of the diaphragm. A large deformation behavior of the diaphragm has been investigated using the commercial finite element program MARC K7.1. The several elastic moduli have been used in linear analysis and Ogden`s coefficients have been used in non-linear analysis. As a result, it has been shown that the deformation behavior with a elastic modulus of 0.3 ㎏/㎟ is similar to the behavior of non-linear analysis. And, the modified diaphragm shape to reduce the stress concentration has been proposed.
김완두(Wan-Doo Kim),우창수(Chang-Su Woo),최경진(Kyung-Jin Choi) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
The air spring is used in secondary suspension system for railway vehicle to reduce and absorb the vibration and noise. In this paper, the characteristics and durability test was conducted in laboratory by using servo hydraulic fatigue testing system to evaluate the reliability. And to guarantee the adaptation of this air spring, the ride comfort and air pressure variation were measured in train test. The experimental results show that the characteristics and durability of domestic development productions are obtained the good results and the stiffness of the air spring which had become 6 year over increased. Also, the dynamic characteristics of domestic and existing product agree well the results obtained.
김완두(Wan-Doo Kim),김완수(Wan-Soo Kim),우창수(Chang-Soo Woo),정승일(Seung-ll Jung),김석원(Seok-Won Kim),김영구(Young-Koo Kim) 한국철도학회 2001 철도저널 Vol.4 No.4
A chevron rubber spring is used in primary suspension system for rail vehicle. The chevron spring support the load carried and reduces vibration and noise in operation of rail vehicle. The computer simulation using the nonlinear finite element analysis program MARC executed to predict and evaluate the load capacity and stiffness for the chevron spring. The appropriate shape and the material properties are proposed to adjust the required characteristics of chevron spring in the three modes of flexibility. Also, several samples of chevron spring are manufactured and experimented. It is shown that the predicted values agree well the results obtained from experiment.
트라이보 부품 신뢰성 시험기 개발 및 오일레스베어링의 마찰특성에 관한 실험적 연구
김완두(Wan-Doo Kim),조준행(Joon-Haeng Cho),김동진(Dong-Jin Kim) 한국트라이볼로지학회 2003 한국트라이볼로지학회 학술대회 Vol.36 No.-
The scroll compressor with alternative refrigerant has been developed and generally main rotational shaft of it has been supported by oilless bearing. This paper deals with the development of oilless bearing reliability tester and investigation of the frictional characteristics of it. The coefficient of friction has been calculated from the measured normal force and torque of shaft under various speeds, loads and pressures. Especially, the effects of test parameters was evaluated for the life of oilless bearings.