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윤문철,조현덕,김성근,김영국,조희근 한국공작기계학회 2001 한국생산제조학회지 Vol.10 No.4
In this study, the static and dynamic characteristics of turning process was modelled and the analytic realization of regen-erative chatter mechanism was discussed. In this regard, we have discussed on the comparative assessment of recursive time series modeling algorithms that can represent the machining process and detect the abnormal machining behaviors in precision turning operation. In this study, simulation and experimental work were performed to show the malfunction behaviors. For this purpose, new Recursive Extended Instrument Variable Method(REIVM) was adopted for the on-line system identification and monitoring of machining process. Also, we can apply REIVM algorithm in real process for the detection of chatter frequency and dynamic property and analyze the stability lobe of the system by changing a parameter of cutting dynamics in regenerative chatter mechanics, if it is stable or unstable. Also, The stability lobe of chatter was analysed.
윤문철,조현덕,김성근,김종수 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.3
In this paper, we have discussed on the characteristics and modeling of machined geometry which was established for the case of round shape machining, also the effects of externally machined profile are analyzed and its modeling realia-biliy was verified by the experiments of roundness testing, especially in lathe operation. In this study, we established a harmonic geometric model with the parameter harmonic function. In general, we can calculate the theoretical roundness profile with an arbitrary multilobe parameter. But in real experiments, only 2-5 lobe profile was frequently measured. the most frequently measured ones are 3 and 5 lobe profile in experiments. With these results, we can predict that these results may be applied to round shape machining such as turning, drilling, boring, ball screw and cylindrical grinding operation in bearing and shaft making operation with the same method. In this study, simulation and experimental work were performed to show the profile behaviors. we can apply these new modeling methods in real process for the predic-tion of part profile behaviors machined such as in round shape machining operation.
윤문철 釜慶大學校 1999 釜慶大學校 論文集 Vol.4 No.1
In this paper, a modeling of machined geometry was established for the case of round shape machining, and the effects of externally machined profile analyzed and its realiability was verified by the experiments of roundness, especially in lathe operation. In this study, harmonic geometric model was proposed with the parameter harmonic function. In general, we can calculate the theoretical roundness profile with arbitrary multilobe. But in real experiments, only 2-6 lobe profile was measured. The most freguently measured ones are 3 and 5 lobe profile in experiments. With these results, we can predict that these results may be applied to round shape machining such as drilling, boring, ball screw and cylindrical grinding operation with the same method.
윤문철,김광희,김종도 한국기계가공학회 2006 한국기계가공학회지 Vol.5 No.3
The analytical realization of uncoupled system was introduced in this study using times series and its spectrum analysis. The ARMAX spectra of time series methods were compared with the conventional FFT spectrum. Also, the response of second order system uncoupled was solved using the Runge-Kutta Gill method. In this numerical analysis, the displacement, velocity and acceleration were calculated. The displacement response among them was used for the power spectrum analysis. The ARMAX algorithm in time series was proved to be appropriate for the mode estimation and spectrum analysis. Using the separate response of first and second mode, each modes were calculated separately and the response of mixed modes was also analyzed for the mode estimation using several time series methods.