http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
김관주(K. J. Kim),심규석(G. S. Shim) 한국자동차공학회 1997 한국자동차공학회 학술강연초록집 Vol.1997 No.4
Finite element method has been used to reduce the weight of the arm crane by changing both the shape and thickness of the boom. To verify the computational results of the baseline arm crane model, strain gage measurement was carried out. To obtain the optimal shape of the crane cross section. the sensitivity analysis of the stress with respect to boom thickness was performed. Based on proposed cross section of boom. a designer can reduce the weight of a arm crane efficiently and safely.
[論文] 다종의 가진방법을 이용한 비연성 경향을 가진 차실모형의 모우드 해석
김시조(S.J.Kim),조동우(D.W.Cho),김관주(K.J.Kim),한상욱(S.W.Han) 한국자동차공학회 1992 오토저널 Vol.14 No.1
Interior noise in a car is known to have an important influence on product acceptability. This noise is closely correlated with structural-acoustic vibration. When considering noise problem, the structural-acoustic relation of a vehicle cabin model needs to be identified. However, it is very difficult to get the modal parameters of this kind of cabin structure composed of thin plates: because it not only can be excited by the acoustic vibration of cavity, but also tends to have decoupling effects of one plate from another. In order to obtain modal parameters more precisely, various excitation techniques, i.e. impact, pure random, burst random, and swept sine testing are applied for the first step. In the case of the cabin model, impact and swept sine testing show good results. Next, the determination of the excitation point by trial-and-error and the accurate measurements of FRF's are performed with these methods. The modal parameter extraction is carried out for the final step. This paper proposes a new approach to find the modal parameters more reliably in the case of high decoupling effects. That is, the convergence of MIF and MCF in each panel, which provide some criteria for the validity of the obtained modal parameters, is observed. And from those results, the pretty accurate modal parameters can be determined. A comparative assessment between the modal testing and the FEM is also performed.
축소 모델 실험장치를 이용한 철도 스킬소음의 특성에 대한 실험적 연구
김지용(J. Y. Kim),황동현(D. H. Hwang),이준헌(J. H. Lee),김관주(K. J. Kim),김재철(J. C. Kim) 한국도시철도학회 2015 한국도시철도학회논문집 Vol.3 No.4
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 wheel’s 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.