Papers by Author: Ji Guang Han

Abstract: When the slot number of geneva is fixed, the kinematic coefficient of common geneva mechanism is a fixed value, too. Using the elliptic gear mechanism as the drive crank of the Geneva, the variable transmission ratio of the elliptic gear mechanism is utilized, which makes the kinematic characteristic of the geneva mechanism changed. A synthesis method of combined geneva mechanism is put forward according to the kinematic coefficients in this paper. The calculation methods of the maximum and minimum kinematic coefficient are proposed. The parameters of the combined geneva mechanism are presented, which the middle position of the kinematic range of the geneva has approximate constant velocity characteristics.

Abstract: By carefully researching and analyzing on cooling process of medium thickness steel plate, a mathematics model of heat transfer and its corresponding simulation model are established and evaluated with finite discrimination for a selected cooling object, and a simulation model is established. Through simulation and locate testing, the calculated values obtained are agreed very well with the measured ones. This indicates that the simulation model can preferably reveal the accelerated cooling process of medium thickness steel plate and can be applied to guide the manufacture of medium thickness steel plate.

Abstract: The traditional design and analysis method for the eccentric involutes gears transmission has model error. Some important parameters, such as minimum geometrical center distance and eccentricity, are not calculated accurately. The differential equation of eccentric involute gears transmission is established on account of the geometrical relationship of eccentric involute gears transmission. A calculating method of the geometrical center distance and eccentricity are derived. The relationship between the minimum geometrical center distance or maximum transmission ratio and initial meshing angle and eccentricity are analyzed. The minimum geometrical center distance and eccentricity are fitted by polynomial. The analysis and design can be completed fast and accurately by using polynomial fitting formals, so the process of analysis and design are simplified.