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축소 모델 실험장치를 이용한 철도 스킬소음의 특성에 대한 실험적 연구
김지용(Jiyong Kim),황동현(Donghyeon Hwang),이준헌(Junheon Lee),김관주(Kwanju Kim),김재철(Jaechul Kim) 한국소음진동공학회 2015 한국소음진동공학회 논문집 Vol.25 No.5
Squeal noise is a harsh, high-pitched sound that occurs when railways are running at sharp curve tracks. The cause of squeal noise is known to be the transient lateral traction force between wheel and rail. Field measurements are too difficult to control the parameters. Thus, the scaled test rig should have been made in order to investigate the generating mechanism of squeal noise. The unique feature of our test rig, HSTR(Hongik Squeal Testing Rig), is that DOFs of its wheelset are as close to as those of the real railway. The attack angle and running speed of the rail roller are controlled in real time for simulating a transient characteristic of driving curve. The environment conditions, such as given axle load, running speed, and wheels yaw angle have been identified for generating squeal noise and the squeal noise itself has been measured. The relation between wheel creepage and creep force in lateral direction and the criteria for squeal noise have been investigated, which results has been verified by finite element method.
HSTR(Hongik Squeal Test Rig) 이용한 스킬 소음의 실험적 특성 연구
김지용(Jiyong Kim),황동현(Donghyeon Hwang),이준헌(Junheon Kim),김관주(Kwanju Kim),김재철(Jaechul Kim) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
Squeal is a harsh noise of the high-frequency range occurring at the sharp curve tracks. The noise generates while lateral traction force excites the wheel and the rail. Field measurements are difficult to control the parameters and the contact force. Thus, we have made the scaled test rig. The unique feature of our test rig is that wheelset’s movement is similar to that of the railway, as real as possible. The left and right rail roller can be controlled independently for realization of difference of left and right speed at the curved rail. The attack angle and rail roller speed are controlled in real time for simulating a transient characteristic of the driving curve. the contact force between the wheel and the rail are measured by the stain-gage mounted on the rail roller. The relation between creepage and creep force and the criteria for squeal noise have been investigated.
김지용(Jiyong Kim),황동현(Donghyeon Hwang),이준헌(Junheon Lee),김관주(Kwanju Kim),김재철(Jaechul Kim) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10
스킬 소음은 급격한 곡선 부분에서 발생하는 듣기 싫은 고주파수 영역의 소음을 말한다. 이러한 소음은 차륜과 레일간 횡 방향 접촉력이 차륜, 레일을 가진 하면서 발생한다. 실제 차량에서는 접촉력과 관련 인자들을 제어하기 어려움이 있으므로, 스킬소음 축소 실험장치를 제작하였다. 제작한 실험 차륜은 가능한 실지 차량과 유사한 동특성을 갖도록 좌우 차륜을 가지고 있으며, 좌우 레일 롤러를 독립적으로 제어하여 곡선부에서의좌우 속도 차를 구현 가능토록 하였다. 또한 곡선구간 주행 시의 과도 특성을 나타낼 수 있도록 구동각 및 구동속도를 실시간으로 제어가능하다. 레일 롤러에 장착된 스트레인게이지를 이용하여, 차륜과 레일 사이의 접촉력을 측정한다. 여러 인자가 접촉력과 스킬소음을 발생시키는데 미치는 영향을 살펴보고자 한다. Squeal is a harsh noise of the high-frequency range occurring at the sharp curve tracks. The noise generates while lateral traction force excites the wheel and the rail. Field measurements are difficult to control the parameters and the contact force. Thus, we have made the scaled test rig. The unique feature of our test rig is that wheelset’s movement is similar to that of the railway, as real as possible. The left and right rail roller can be controlled independently for realization of difference of left and right speed at the curved rail. The attack angle and rail roller speed are controlled in real time for simulating a transient characteristic of the driving curve. the contact force between the wheel and the rail are measured by the stain-gage mounted on the rail roller. The relation between creepage and creep force and the criteria for squeal noise have been investigated.
CARSIM과 Simulink를 이용한 직렬형 하이브리드 자동차의 동력성능 시뮬레이션에 관한 연구
이준헌(Junheon Lee),김관주(Kwanju Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Hybrid cars are developed by the reason of environment at isssues. Conventional computer program for hybrid vehicles are focusing on the fuel efficiency matters. But this models can’t show vehicle stability analysis. Vehicle stability is analyzed considering with series hybrid cars dynamic. The fuel efficiency simulation can be provided with this method.
차량 날개의 형상 변화가 경주용 차량의 주행 안정성에 끼치는 영향에 대한연구
김관주(Kwanju Kim),김현준(Hyunjun Kim),이준헌(Junheon Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The purpose of the study is to optimize the down force of the formula vehicle in order to enhance the vehicle handling stability. Required data for the dynamic analysis of the vehicle are as follows: Mass, moment of inertia, and tire dynamic properties. Mass and moment of inertia data are calculated using Siemens NX 5.0. And those are verified by VIMF measurements of GMDAT. Dynamic data for the tire is supplied by Kumho Tire. Aerodynamic forces for two types of the rear wing are calculated using Fluent software. Full vehicle analysis using Carsim software has been carried out to find out the improvement of the vehicle stability by changing the shape of the rear wing.