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전도영(Doyoung Jeon),공경철(Kyoung-chul Kong) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
This paper applies the fuzzy logic controller to a semiactive seat suspension system in order to obtain the better ride comfort in constraint of specific rattle space. The seat suspension system used for this research is a scissors-type one with the MR (Magnetic Rheological) fluid damper. Since a seat suspension system with a driver can not be exactly modeled, it is effective to control with the fuzzy logic controller. The rule was carefully tuned to effectively reduce the vibration transmitted to a driver. The on-road ride was realized on a hydraulic excitor and the result shows that the fuzzy controller has reduced the vibration of a seat suspension system compared to the continuous skyhook controller.
전도영(Doyoung Jeon),이건(Gun Lee),김경호(Kyoungho Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
The detection of tool wear is very important in an automated manufacturing system. This paper presents a tool condition monitoring system based on the wavelet transform analysis of the AC servo motor current in drilling process. The current measurement is relatively simple and its mounting will not affect machining operations. The discrete wavelet transform was used to decompose the current signal of a spindle AC servo motor in the time-frequency domain. The feature vectors were extracted from the decomposed signals and compared for normal and wear conditions. The results show the possibility of an effective application of wavelet transform analysis on the tool condition monitoring.
안병일(Byungil Ahn),전도영(Doyoung Jeon) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
A controllable bus driver’s seat was developed using an MR fluid damper. A four bar linkage mechanism<br/> with the damper and spring replaced the fixed structure between the seat cushion and floor. The contrinuous<br/> skyhook algorithm changes the damping force of the damper according to sensor inputs. Experiments show<br/> that a person feels less vibration with the continuous skyhook algorithm compared to the skyhook algorithm<br/> and the fixed damper.