Papers by Author: Yue Han

Abstract: Based on the theory of linear transformation and vector operations, an explicit analysis method is proposed for walking-beam oil pumping unit, which overcomes the difficulties of traditional method: roots discriminating of quadratic equations method and angle quadrant discriminating trigonometric functions method. The kinematics and torque factor of suspension point, and the crank torque of the three kinds of walking-beam pumping units are calculated in a new way according to the rule of power conservation, which avoids the complex calculation of the force bore by each rod. The validity of this proposed method is illustrated with a numerical example.

Abstract: The forward push lifting mechanism of a dump truck is simplified to a combination of a four-bar linkage and a triangular arm. Based on quasi-static assumption, using linear transform and vector operations, an explicit analysis method is proposed to calculate joints’ dynamic position of the link lifting mechanism, which overcomes the difficulties of traditional method: roots discriminating of quadratic equations method and angle quadrant discriminating trigonometric functions method. And the pushing force of the stroke is solved from a linear system of only two equations. The validity of this proposed method is illustrated with a real engineering problem.

Abstract: Acceleration time, as an important dynamic performance index of an automobile, is classified as acceleration time of shift and acceleration time at a given gear to evaluate an automobile’s acceleration performance. Compared with the traditional calculation method, this proposed algorithm calculates an automobile’s speed of optimal-power shift by using linear interpolation; calculates the acceleration time using Gauss integral, and calculates the acceleration time to a given distance by combining conversion method and interpolation method. A numerical example is given and the actual test results indicate that this algorithm is fit for automobile design.