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컴퓨터 모델을 이용한 대형트럭의 승차성능 평가에 관한 연구
문일동,오재윤,Mun, Il-Dong,O, Jae-Yun 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.12
This paper develops a computational model for estimating the ride quality of a cabover type large-sized truck in a double wheel bumpy ride test. The computational model is developed using ADAMS. To verify the developed model, an actual vehicle double wheel bumpy ride test is performed. In the test, the vehicle maintains a straight course with a constant velocity such that the front two wheels are passed the bump at the same time. The bump has the height of 60mm, and the width of 550mm. In the test, four velocities are used. They are 10kph, 20kph, 30kph and 40kph. Since the large-sized truck's center of gravity location is high, and its weight is heavy, it is a quite severe test condition to perform the test with more than 30kph velocity. In the test, vertical accelerations on the floor of the cab are measured. The measured accelerations are compared to the simulation results. From the comparison, it is shown that the developed model can predict not only the measured acceleration's tendency but also peak accelerations quite well. In this paper, the validated model is utilized to compare the ride quality between a vehicle with a multi-leaf spring and a vehicle with a tapered leaf spring in the front suspension system in a double bumpy ride test.
문일동,오재윤,권혁조,이승호 전북대학교 공학연구원 ( 구 전북대학교 공업기술연구소 ) 2002 工學硏究 Vol.33 No.-
This paper develops a computational model using ADAMS for dynamic characteristic analysis of a large-sized commercial vehicle with an air suspension system at rear axle. The air suspension system is composed of an air spring and a half-long tapered leaf spring. Its ADAMS model has 24 rigid bodies and 15 degree-of-freedom. For its modeling, 24 rigid bodies are connected by 10 cylindrical joints, 4 translational joints, 9 spherical joints, 2 universal joints, and 4 revolute joints. For the analysis of handling performance, a double lane change maneuver simulation is performed using the full vehicle ADAMS model with a trunnion suspension or air suspension at rear axle. The simulation is performed with a constant speed of 50, 60, and 70kph respectively. In the simulation, lateral acceleration, roll angle, and yaw rate at the mass center of frame and cab are measured for the handling analysis. For the analysis of ride performance, a bumpy ride simulation is performed using the model. The simulation is performed with a constant speed of 20kph. The bump used in the simulation has the height of 50, 80, and 100㎜ respectively. In the simulation, vertical displacement and pitch angle at the mass center of cab are measured for the ride performance analysis.
로드 시뮬레이터를 이용한 대형트럭의 승차성능 평가에 관한 연구
문일동,오재윤,전지명,김진옥 전북대학교 공학연구원 ( 구 전북대학교 공업기술연구소 ) 2002 工學硏究 Vol.33 No.-
This paper proposes a scheme to assess a heavy truck's ride performance in an objective way using road simulator test results. The road simulator has six posters. They are excited in in-phase mode or out-of-phase mode to produce bounce, pitch or roll motion independently. In the road simulator test with a real vehicle, 8-accelerometer, 4-displacement sensor, and one gyro system are used for measuring the vehicle's vertical acceleration, vertical displacement, pitch angle and roll angle. The accelerometers are attached at each axle, left and right frame, and driver seat floor of the cab. They are used to monitor the vehicle's bouncing motion. The displacement sensors are attached at the center of the first and last cross member of the frame, and left and right of the deck. They are used to monitor pitch and roll motion of the frame. The gyro system is attached at the mass center of the cab. It is used to monitor the cab's pitch and roll motion. The real vehicle's road simulator test results are processed to identify the natural frequencies of bounce, pitch and roll mode with respect to a driver. The identified natural frequencies are compared with ride performance criteria defined by ISO2361 to assess the vehicle's ride performance.
범프 로드에서 대형트럭 프레임의 탄성효과를 고려한 컴퓨터 모델 개발
문일동(Moon, Il-Dong),지창헌(Chi, Chang-Hun),김병삼(Kim, Byoung-Sam) 한국소음진동공학회 2005 한국소음진동공학회 논문집 Vol.15 No.10
This paper develops a computer model for estimating the bump characterisitcs of a cat)over type large-sized truck. The truck is composed of front and rear suspension systems, a frame, a cab, and ten tires. The computer model is developed using MSC.ADAMS. A shock absorber, a rubber bush, and a leaf spring affect a lot on the dynamic characteristic of the vehicle. Their stiffness and damping coefficient are measured and used as input data of the computer model. Leaf springs in the front and rear suspension systems are modeled by dividing them three links and joining them with joints. To improve the reliability of the developed computer model, the frame is considered as a flexible body. Thus, the frame is modeled by finite elements using MSC.PATRAN. A mode analysis is performed with the frame model using MSC.NASTRAN in order to link the frame model to the computer model. To verify the reliability of the developed computer model, a double wheel bump test is performed with an actual vehicle. In the double wheel bump, vortical displacement, velocity, acceleration are measured. Those test results are compared with the simulation results.
문일동(Ildong Moon),김기태(Gitae Kim),임정환(Junghwan Lim),현상학(Sanghak Hyun),오재윤(Chaeyoun Oh) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The steering feel is one of the major handling performance of the vehicle. This paper develops a computational model for objective steering feel assessment of a commercial vehicle. In order to validate the reliability of the developed computation model, tests with a real vehicle are performed. Simulation results performed with the developed computational model shows a good correlation with test results performed with a real vehicle. The developed model is used for analyzing the influence of the characteristic of a steering system and tire on steering feel. That is, a study is performed to analyze the influence of the major parameters which significantly affect on the characteristic of the steering system and tire on steering feel with the developed model.
상용차량의 브레이크 시스템과 차량 시스템 주파수 분석을 통한 브레이크 저더의 실험적 고찰
문일동(Il-Dong Moon),김종대(Jong-Dae Kim),오재윤(Chae-Youn Oh) 대한기계학회 2007 大韓機械學會論文集A Vol.31 No.12
This paper studies experimentally on the building-up process for the amplitude of a commercial truck vibration induced by brake judder. A front axle drum equipped with a drum brake system is utilized for this experiment. A brake dynamo test, a real vehicle ride test and a real vehicle braking test are performed for the analysis of brake judder. The brake dynamo test measures judder by applying brake chamber pressures of 1, 2 and 3 bar at initial brake pad temperatures of 100℃ and 150℃. In order to assess the vertical acceleration at the front axle, the real vehicle ride test on a straight test road with velocities of 20, 40, 60 and 80 ㎞/h is performed. The real vehicle braking test is carried out at the deceleration rate of 0.2g from a velocity of 90㎞/h for evaluating the vertical, lateral and longitudinal accelerations both at the front axle and at the cab floor under the driver's seat. The magnitudes and frequencies of the measured peak accelerations from the brake dynamo test, the real vehicle ride test and the real vehicle braking test are comparatively analyzed. This paper shows that the vibration produced by brake judder is built up due to the brake system's peak acceleration frequency being close to the vehicle ride mode's frequency.