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초음파의 에코 높이를 이용한 미소(微小) 박리(剝離) 두께 측정에 관한 연구
한응교,장경영,황병일,이범성,박익근,Han, E.K.,Jang, K.Y.,Hwang, B.I.,Lee, B.S.,Park, I.G. 한국비파괴검사학회 1993 한국비파괴검사학회지 Vol.13 No.1
If the infinitesimal delamination exists and the two waves can hardly be distinguished from each other on account of being much closer, we cannot measure the thickness of delamination by the time difference method. On this study, we calculated the thickness of infinitesimal delamination model by means of measuring echo height due to the deflection of material particles and utilized Newton Ring for optical measurement as a delamination model. From the result of Newton Ring expressed in the delamination model, we can calculate the infinitesimal delamination thickness up to $0.2{\sim}0.3{\mu}m$ due to the difference of acoustic impedance by the ratio of the echo height to the total reflection.
김흥섭(H.S.Kim),이태연(T.Y.Lee),시준(J.Shin),조성오(O.S.Jo),방승현(S.H.Bang),장경영(K.Y.Jang),오재응(J.E.Oh) 한국자동차공학회 1992 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1992 No.11
With the advance of the starrlard of living, the demand on automobile reqires beyond the traffic device, therefore the interior noise has been the important factor for improvement of ride quality. The frequency components in the vehicle cabin on driving are effeted by the frequency of running engine. Specially, in low frequency ranges(20-200Hz), rooming noise of structual coupling noise is generated by the coupling of vibration of driving system and acoustical mode of interior. In this study, multichannel adaptive algorithm was realized and the noise of specific region in the interior of automobile was intended to be reduced through the control of engine noise in the vehicle cabine using developed algorithm.
신준(J.Shin),이정철(J.C.Lee),오재응(J.E.Oh),장경영(K.Y.Jang) 한국자동차공학회 1992 오토저널 Vol.14 No.5
There has been a suggestion of many techniques as the methods of diagnosis for rotational machi- nery. In this study, HFRT was used as the analysis method for ball bearing of automobile and was compared with the conventional ANC technique. And this paper presented the computer simulation process about fault types and noise for the validity of the algorithm and identification of the physical meanings of HFRT. Also, experiment was performed using ball bearing and the results showed that HFRT was much more effective than the conventional methods in diagnostic process.