Browsing by Author "WU, JC"

Now showing 1 - 6 of 6

A 550MHz 9.3mW CMOS frequency divider
(1995)
WU, JC
;
CHANG, HH
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
A FUZZY MODEL OF RIDER CONTROL FOR A MOTORCYCLE UNDERGOING LANE CHANGE
(1994)
WU, JC
;
LIU, TS
;
交大名義發表
;
機械工程學系
;
National Chiao Tung University
A rider-motorcycle system can be treated as a representative man-machine system in view of the major role that both the rider and the motorcycle play in determining the performance of the integrated system. Of interest in this work is the handling property which is crucial to safety during riding. In this study, al mathematical model of three-dimensional multi-body dynamics is constructed, which accounts for not only motorcycle dynamics but also the rider's posture change. Since a fuzzy controller is essentially a nonlinear process representing the qualitative knowledge of human experts on the behaviour of systems and desired control actions, a fuzzy control method is applied to determine a rider's handling action. The fuzzy controller based on fuzzy rules and fuzzy reasoning methods plays the role of the rider in a rider-motorcycle system. Accordingly, a rider-motorcycle system undergoing lane change is simulated. The time variation of steering angle, yaw rate, and lateral acceleration are demonstrated. Effects of yaw rate and lateral acceleration on handling property are examined-based on Bode plots.
A MODEL FOR A RIDER MOTORCYCLE SYSTEM USING FUZZY CONTROL
(1993-01-01)
LIU, TS
;
WU, JC
;
交大名義發表
;
機械工程學系
;
National Chiao Tung University
A rider-motorcycle system is a representative man-machine system in view of the major role that the rider plays in determining the performance of the integrated system. The handling property of motorcycles influences safety during riding. In the study, a motorcycle model subjected to fuzzy control representing rider's perception and action is investigated to facilitate motorcycle design. A mathematical model of three-dimensional (3-D) multibody dynamics is constructed, which accounts for not only motorcycle structures but also the rider's posture change. The fuzzy controller based on control rules and fuzzy reasoning methods plays the role of the rider in a rider-motorcycle system. The fuzzy control is facilitated by the construction of look-up tables. A rider-motorcycle system undergoing circular motion is simulated. The study provides a viable means for computer-aided design of a representative man-machine control system.
EXPERIMENTAL INVESTIGATION OF GEYSER BOILING IN AN ANNULAR 2-PHASE CLOSED THERMOSIPHON
(1995-01-01)
LIN, TF
;
LIN, WT
;
TSAY, YL
;
WU, JC
;
SHYU, RJ
Geyser boiling in a vertical annular two-phase closed thermosyphon was experimentally studied. The effects of the heat load, condenser temperature, degree of liquid fill and length of the evaporator on the characteristics of the geyser boiling were investigated in detail for both water and ethanol as working fluids. Flow visualization at light heat load clearly illustrates the process of geyser boiling. It also indicates that it occurs more frequently and irregularly at high heat load. The wall temperature measurement dictates that the period of geyser boiling is shorter at a higher heat load, a shorter evaporator length and a smaller liquid fill. Additionally, the heat transfer coefficient is found to increase approximately linearly with the heat load on a logarithmic scale. An empirical equation was proposed to correlate the data for the heat transfer coefficient. A criterion was suggested for the occurrence of geyser boiling based on the present data.
FUZZY CONTROL OF RIDER-MOTORCYCLE SYSTEM USING GENETIC ALGORITHM AND AUTOTUNING
(1995-06-01)
WU, JC
;
LIU, TS
;
機械工程學系
;
Department of Mechanical Engineering
This study investigates the stability control of a rider-motorcycle system based on fuzzy control in conjunction with both genetic algorithm (GA) and an auto-tuning method. The autotuning method, which entails tuning rules, is employed to on-line adjust output gains of fuzzy control. Although a GA has been used for fuzzy control in the literature, it has been confined to aiding membership functions' enaction. By contrast, this study employs a GA to determine optimal parameters in control rules for fuzzy control and in tuning rules for the auto-tuning method. Both computer simulation and experiment with regard to an inverted pendulum hinged to a rotating disk are carried out to represent the circular motion of the rider-motorcycle system, in which the inverted pendulum represents a rider's body in banking motion. The relation between riding speeds of the motorcycle and leaning angles of the rider is examined based on speed variations and Bode plots. Simulation and experimental results show the significant effect of the rider's banking angle on stability control.
LOW COST MAGNETO-OPTIC DISK BYTE ERROR RATE TESTING SYSTEM
(1995)
WU, JC
;
JENG, GS
;
SHIEH, HPD
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics