Papers by Author: Hai Bo Huang

Abstract: In this paper, the L-shape arm of Motorman-HP20 robot is light-weighted. Multi-body dynamic model of the robot with flexible parts is built to get the mechanical behaviors in the most critical condition. Then the forces of both ends of L-shape arm are obtained and applied to the FE model. Then the topology optimization method is applied to the FE model. Refer to the topological structure, the refined structure is given due to experience. The results show that the weight and maximum displacement of the new structure are 5.2Kg and 0.066 mm respectively, which are less than those of the original design at the same condition in this paper.

Abstract: The dynamic characteristics of light-weighted structure are more important due to its flexible property. In this paper, the experiment of modal analysis for Motorman-HP20 robot is carried out. The method of one location for response and multi-locations for excitation are applied in the experiment. The orthogonal polynomials curve fitting method is used for modal parameters identification. The first six order modal parameters are obtained. The results show that the structure of L-shape arm may be re-designed due to the modal shapes due to severe vibration of L-shape arm in modal frequencies of some prior orders and the poor base frequency.

Abstract: The mold for cross wedge rolling (CWR) is difficult in making, complicated in adjustment and high in costs. It is extremely meaningful to optimize the parameters for wear reduction to extend the mold life. This paper analyzes the influence of the processing parameters on the mold wear based on orthogonal experimental design method and the computer simulation method, which can optimize the parameters in an efficient and simple way. The results show that the rolling process using optimized technological parameters can greatly extend the mold life of the cross wedge rolling.

Abstract: The rigid-flex coupled multi-body dynamic model of Motoman HP20 was built in this paper. The parts geometry shapes were modeled in 3D modeling software and imported into the multi-body platform. Then the joints were added to the parts. The arms were analyzed in FE software and modal neutral files were obtained. Then rigid parts were replaced by the modal neutral files. Driven curves of each arm joint were obtained by D-H method. The modal analysis of system was also made to analyze the robot dynamic characters. The results give some suggestions for robot motor selection and structural dynamic optimization.

Abstract: The paper is to simulate and analyze the mechanical behavior of the clamp system of an injection molding machine. Different commercial simulation tools are combined to create complete model of the system. The flexibility of several components is included by importing a FE model generated in ANSYS. Then the dynamic characters are presented in MBS software ADAMS. The mechanical behavior of connecting bars, tie bars were analyzed and quantified in order to work out improvements. The results show that the rear link and tie bar were the weakest parts in terms of safety.

Abstract: Movable platen is key component of a plastic injection machine. In this paper the movable platen of HBT80X/1 plastic injection moulding machine is redesigned using topology optimization method. The SIMP method and OC method were applied as the optimization principle and Optimality Criteria. After given the topology structure, the refined structure is designed with experience. The results show that the weight and maximum placement of the new shape were 53Kg and 0.009mm less than the original design.