Liu Shanzeng

Dynamics of 3-DOF spatial parallel manipulator with flexible links

The dynamics of 3-DOF spatial parallel manipulators with flexible links were performed. Firstly, a model of spatial flexible beam element was proposed, and the dynamic equations of elements and branches of the parallel manipulator were derived. Secondly, using the kinematic and dynamic constraint equations of the parallel manipulator, the overall system dynamic equations of the parallel manipulator were obtained by assembling the dynamic equations of branches. Thirdly, the dynamic responses of the 3-RRS parallel mechanism with flexible links were analyzed through numerical simulation. This paper can provide necessary information for the dynamic performance analysis, dynamics optimization design and control of the 3-RRS flexible parallel mechanisms.

Virtual prototype simulation of a 3-RRS flexible parallel manipulator

In applications where high structural stiffness, position accuracy, speed motion, and good dynamic performance are predominant requirements, parallel manipulators offer obvious advantages over serial ones. However, dynamic modeling and analysis of parallel manipulator, which are characterized by multiple closed-loop chains, are generally more complex than in the serial mechanism case. Especially, dynamic problems of the parallel manipulators with flexible links have not been studied as extensively. The primary goal of this research is the virtual prototype simulation of spatial flexible parallel manipulator. Firstly, the virtual prototype of a 3-RRS flexible parallel manipulator is established on the basis of the finite element software SAMCEF. Then, the displacement, velocity and acceleration of the 3-RRS flexible parallel manipulator are analyzed. The simulation results show that the flexibility of link has important influence on kinematics and dynamics performance of the flexible parallel manipulator.

Kinematics and Force Analysis of Lifting Mechanism of Detachable Container Garbage Truck

The kinematics and force analysis of the lifting mechanism of the detachable container garbage truck is performed in this article. First of all, the structural features and working mechanism of detachable container garbage truck are introduced. Then, for each working condition of the DCG truck, kinematic models are established, and the force analysis of the lifting mechanism is performed. Finally, the movement of a 20 ton DCG truck is calculated and analyzed as an example. This study provides a theoretical basis for the optimized design of DCGgarbage truck.

Kinematic constraint conditions and dynamic equations of spatial flexible parallel manipulator

The primary goal of this research is dynamics modeling and analysis of spatial parallel manipulator with flexible links. A new model of spatial finite element beam model is proposed. The kinematic constraint conditions of the moving platform and the branches of the spatial flexible parallel manipulator are derived. The dynamic model of the moving platform is developed based on the Newton-Euler principle. Then, using the kinematic constraint equations and dynamic model of the moving platform, the overall system dynamic equations of the parallel manipulator are obtained through assembling the dynamic equations of elements. Finally, the numerical simulation of a 3-RRS parallel manipulator was presented and compared with the results of SAMCEF software simulation. The results showed that the effectiveness and correctness of the dynamic models proposed in this paper.

Dynamic simulation of 3-RSR flexible parallel robot

With the increasing requirements of high precision and high efficiency, the flexible parallel robot characterized by both the flexible robot and the parallel robot will be a new hot topic in robotics research. The primary goal of this research is the dynamic simulation of 3-RSR flexible parallel robot. Firstly, the virtual prototype of a 3-RSR parallel robot with flexible links is established on the basis of the finite element software SAMCEF. Then, the displacement, acceleration and equivalent stress of the 3-RSR flexible parallel robot are analyzed. Numerical results show that the flexibility of link has important influence on dynamics performance of the flexible parallel robot.