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김태진(Kim, Tae-Jin),김병진(Kim, Byung-Jin),김승오(Kim, Seung-Oh),민제홍(Min, Je-Hong),정진태(Chung, Jin-Tai) 한국소음진동공학회 2012 한국소음진동공학회 논문집 Vol.22 No.1
In this study, a multi-body dynamic model is developed for a washing machine and the dynamic behaviors of the machine are investigated. The mechanical properties such as spring constants and damping factors are measured from vibrational experiments. With these experimentally obtained mechanical properties, a computer simulation model for the washing machine is established by using a commercial multi-body dynamics software DAFUL. In order to verify the developed simulation model, the dynamic responses computed from simulation are compared to the responses measured from vibration experiments. In addition, the effects of the stiffness and damping factors on the dynamic responses are also analyzed.
가변시간간격을 갖는 Newmark 시간적분법의 사다리꼴법칙에 대한 안정성과 정확도
노용수,정진태,배대성,Noh, Yong-Su,Chung, Jin-Tae,Bae, Dae-Seong 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.10
Stability and accuracy for the trapezoidal rule of the Newmark time integration method are analyzed when variable time step sizes are adopted. A new analytic approach to stability and accuracy analysis is also proposed for time integration methods with variable time step sizes. The trapezoidal rule with variable time step sizes has the "actual" unconditional stability which is the same as that of the method with constant time step sizes. However, the method with variable time step sizes is first-order accurate while the method with constant time step sizes is second-order accurate. accurate.
권태종,채호철,한창수,정진태,안강호 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.6
Spinning mechanism is generally used in coating process on grass plates. Rebounding PR(Photo Resist) which leads to occur inferiority of coating process is caused by vibrational energy of whole coating system. In this study, the sensitivity analysis is performed to analyze and reduce vibrational terns in the spin coating system. The sensitivity analysis is bared on the numerical expression of this system. By the bond graph method, power flow of each system is represented by some basic bond graph elements. Any energy domain system is modeled using the unified elements. The modelled spin coater system is verified with power spectrum data measured by FFT analyzer. As the results of verifying model parameters and sensitivity analysis, principal factors causing vibration phenomenon are mentioned. A study on vibration reduction method in the spin coating system is discussed.