Browsing by Author "Huang, KJ"

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Characteristics of monolithically integrated two-wavelength laser diodes with aluminum-free active layers
(2001-02-12)
Lu, TC
;
Fu, R
;
Shieh, HM
;
Huang, KJ
;
Wang, SC
A two-wavelength integrated laser diode (TWINLD) with aluminum-free active areas (AAA) has been realized by monolithically combining two different laser material structures in a single chip utilizing the metalorganic chemical vapor deposition growth and regrowth techniques. The single TWINLD chip comprises two ridge wave-guide lasers, one is an InGaP/InGaAlP material structure for a 650 nm red laser, and another is an InGaAsP/AlGaAs material structure with AAA for a 780 nm infrared laser. The chip geometry is 300 mum long and 300 mum wide with a separation of 150 mum between two laser emission spots. The ridge widths are 3.5 and 2 mum for the red and IR laser, respectively, and both lasers emit a single transverse mode with a threshold current of 12 mA for a 650 nm laser and 14 mA for a 780 nm laser under continuous wave operation condition. (C) 2001 American Institute of Physics.
Dynamic analysis of a spur gear by the dynamic stiffness method
(2000-07-06)
Huang, KJ
;
Liu, TS
;
機械工程學系
;
Department of Mechanical Engineering
This study treats a spur gear tooth as a variable cross-section Timoshenko beam to construct a dynamic model, being able to obtain transient response for spur gears of involute profiles. The dynamic responses of a single tooth and a gear pair are investigated. Firstly, polynomials are used to represent the gear blank and the tooth profile. The dynamic stiffness matrix and natural frequencies of the gear are in turn calculated. The forced response of a tooth subject to a shaft-driven transmission torque is calculated by performing modal analysis. This study takes into account time-varying stiffness and mass matrices and the gear meshing forces at moving meshing points. The forced response at arbitrary points in a gear tooth can be obtained. Calculation results of fillet stresses and strains are compared with those in the literature to verify the proposed method. (C) 2000 Academic Press.
Dynamic analysis of rotating beams with nonuniform cross sections using the dynamic stiffness method
(2001-10-01)
Huang, KJ
;
Liu, TS
;
機械工程學系
;
Department of Mechanical Engineering
This study develops dynamic analysis based on the dynamic stiffness method for a rotating beam of nonuniform cross-section. To deal with nonuniform beams, coefficients related to material and geometric properties in the equation of motion are expressed in a polynomial form. A dynamic stiffness matrix is accordingly formulated in terms of power series. The dynamic response of the rotating beam is calculated by performing modal analysis. It is demonstrated that the present method provides an alternative to the finite element method in dealing with nonuniform rotating beams.