Papers by Author: Jian Liang Wang

Abstract: This paper introduces a simulation study on the executive mechanism of a recent invented controllable mechanism type novel planar 3-DOF mechanical excavator using simulation analysis software MSC.ADAMS. A virtual prototype model is established first, based on which the forward kinematics simulation is carried out employing the DIM functions to achieve an output trajectory similar to the excavating process of a flexible hydraulic excavator. Subsequently, an inverse kinematics simulation is performed accomplishing a given V type output trajectory. Angular displacements, velocities and accelerations of the three input variables are obtained. Results of the simulation study may provide some useful references for further researches such as dimensional synthesis, dynamics and design of the controller of the new type of mechanical excavator.

Abstract: This paper presents a new method to calculate control delay at signalized intersection or other types using speed-time data. For the control delay which composed of deceleration delay, stopped delay, and acceleration delay, it is important to determine the critical points of each delay. This paper uses speed as well as acceleration to determine the critical points and get an accurate result. Different with other researches, it uses the area that composed of real time speed curve and desired speed curve, divided by the downstream speed, to get the control delay precisely. This method needs less data than other methods and can be applied to any traffic condition including variant desired speed or volume. This paper also provides a rapid method, which doesn’t need to determine the critical points, to estimate control delay, and the precision is acceptable.