Papers by Author: Di Zheng

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Authors: Di Zheng, Feng Lu, Li Yong Hu, Yong Jie Shi
Abstract: In mechanical equipments or manufacturing processes, force control is definitely required to achieve desired performance or to ensure product quality. Aiming at this issue, this paper introduced an author-invented torque servo device that utilizes magnetorheological fluids (MRF) to provide a controllable torque. In the paper, the structure and working principle of the MRF-based torque servo device (MRT) were introduced, the constitutive model and the characteristics of the MRF were established and discussed. On the basis, the static and dynamic models of the MRT were both analytically and experimentally studied, and the control of the output torque of the MRT was demonstrated. As an example, the application of the MRT to the polishing of aspheric surfaces was presented in the end.
Authors: Di Zheng, Yong Jiang Yu, Xian Hua Zhang, Xiao Jun Zhao, Yuan Wang, Yong Jie Shi, Feng Lu
Abstract: The objective of this paper is to investigate the effect of shape and size of polishing pad on the material removal characteristics in the NC polishing. The material removal model was established based on Preston equation. The law of the effect of shape and size of polishing pad on the model was simulated. Experiments were carried out. Results showed that both of the shape and size of polishing pads influence the shape of material removal curves, polishing efficiency, and surface roughness. The amount of removed material increases with the increasing of size of polishing pad.
Authors: Jian Yu Bai, Zaihe Yu, Sen Lin Tong, Di Zheng
Abstract: The severe vibration and noise caused by inertia forces within a manufacturing machine are often the bottleneck in increasing the manufacturing speed. Based on kinematics analysis of the applied driving mechanism, this paper proposes an optimal design method for partially canceling the inertia force in pressing machine by using limited number of weight-balancing blocks. The proposed method has been validated by simulations.
Authors: Feng Lu, Di Zheng, Yong Jie Shi, Bin Huang
Abstract: Magnetorheological fluid torque servo (MRT) is a novel torque generating and controlling device. It converts the rotational input of active shearing disc into the torque output of passive shearing disc by controlling the rheological property of the magnetorheological fluid. In this paper, the working principle of the MRT was introduced. The effects of the input rotational speed on the shear stress of the magnetorheological fluid and then the output torque were analyzed. The model describing the relationship of the output torque with respect to the rotational speed of the active shearing disc as well as to other parameters was established. A critical rotational speed was deduced. The factors affecting the critical speed were discussed, and an experiment was conducted to ascertain the validity of the theoretical analysis.
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