Browsing by Author "LO, SC"

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MEASUREMENT OF RESIDUAL-STRESSES IN WELDED STEEL JOINTS USING HOLE DRILLING METHOD
(1992-03-01)
WENG, CC
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LO, SC
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交大名義發表
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土木工程學系
;
National Chiao Tung University
An experimental investigation of the residual stresses in three types of welded structural steel joint is presented. A total of twelve specimens was tested. In this investigation, the blind hole-drilling method of ASTM E837 was used - adapted and improved for determination of residual stresses. To account for the effect of local plasticity due to stress concentration near the drilled hole, new calibration coefficients were obtained by carrying out a series of calibration tests. Then, the residual stresses in the welded joints were determined using the new coefficients. The improved hole drilling method presented in this paper was found to be much less time consuming than the conventional sectioning (saw cutting) method for residual stress measurement. The final results obtained in this study showed good agreement with the residual stresses obtained by previous researchers using the sectioning method.
SLIDING-MODE CONTROLLER-DESIGN FOR SPACECRAFT ATTITUDE TRACKING MANEUVERS
(1993-10-01)
CHEN, YP
;
LO, SC
;
交大名義發表
;
電控工程研究所
;
National Chiao Tung University
This paper presents a robust sliding-mode control law to deal with the spacecraft attitude tracking problems. Two important natural properties related to the spacecraft model of motion are shown and then by using these properties and the second method of Lyapunov theory, the system stability in the sliding mode can be easily achieved. The success of the sliding-mode controller and the robustness to uncertainties are illustrated by an example of multiaxial attitude tracking maneuvers.
SLIDING-MODE CONTROLLER-DESIGN FOR SPACECRAFT ATTITUDE TRACKING MANEUVERS
(1993-01-01)
CHEN, YP
;
LO, SC
;
電控工程研究所
;
Institute of Electrical and Control Engineering
SMOOTH SLIDING-MODE CONTROL FOR SPACECRAFT ATTITUDE TRACKING MANEUVERS
(1995-11-01)
LO, SC
;
CHEN, YP
;
交大名義發表
;
電控工程研究所
;
National Chiao Tung University
A sliding-mode control (SMC) algorithm is derived and applied to quaternion-based spacecraft attitude tracking maneuvers. Based on some interesting properties related to the spacecraft model, a class of linear sliding manifolds is selected. Significantly, a Lyapunov function is introduced in the SMC design, which can avoid the inverse of the inertia matrix and thus simplify the controller design. To improve the transient response before reaching the sliding manifold, the smoothing model-reference sliding-mode control (SMRSMC) is further developed, which requires well-estimated initial conditions. Simulation results are included to demonstrate the usefulness of the SMRSMC method.
Spacecraft attitude tracking control
(1995)
LO, SC
;
CHEN, YP
;
電控工程研究所
;
Institute of Electrical and Control Engineering