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Research on the temperature characteristics of movable tooth transmission motor of electromagnetic harmonic

Open Automation and Control systems Journal 2014年第1期6卷 1980-1986页

作者： Yubo, Ren Lizhong, Xu Parallel Robot and Electromechanical System Laboratory Yanshan University QinghuangdaoHebei China

Based on the heat transfer characteristics of electromagnetic harmonic movable tooth transmission motor, this paper adopted the finite element method to establish a three-dimensional temperature field model for numerical calculation on the basis of four basic assumptions. It analyzed the heat loss and gave out the functional to calculate the temperature field within each medium and obtain the temperature distributing curves. Then taking the prototype as an example, it calculated the steady-state temperature field of the system under different loading. The comparison between the results and measured values has verified the reasonableness of the established model and calculation method employed. The results could provide a theoretical basis for the optimized design of electromagnetic harmonic tooth transmission system. © Yubo and Lizhong;Licensee Bentham Open.

关键词： Temperature

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Influence of structural parameters of electromagnetic harmonic movable teeth transmission on system loss

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Open Mechanical Engineering Journal 2014年 8卷 778-785页

作者： Ren, Yubo Xu, Lizhong Liang, Yongli Parallel Robot and Electromechanical System Laboratory Yanshan University Qinghuangdao Hebei China

In view of the characteristics of electromagnetic harmonic movable teeth transmission system, the heat loss has been analyzed in this paper based on basic assumptions. At the same time, the calculation methods of electromagnetic loss and mechanical loss in system have been also discussed. Moreover, the influence of changes of system parameters on electromagnetic loss and mechanical loss has been analyzed through employing the field-circuit coupling finite element method. According to the analysis results, the numerical calculation model of the three-dimensional temperature field of system can be established. And the theoretical basis can be provided for the optimization design of electromagnetic harmonic movable teeth transmission system and the improvement of transmission efficiency of transmission system. © Ren et al.

关键词： Finite element method

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Cross Structured Light Calibration Based on Planar Target

SSRN

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SSRN 2022年

作者： Liu, Jianxin Dong, Zhikui Chen, Ziming Huo, Weihao Geng, Shihan Li, Yanwen School of Mechanical Engineering Yanshan University Hebei Qinhuangdao066004 China National Cold Rolling Strip Equipment and Process Engineering Technology Research Center Yanshan University Hebei Qinhuangdao066004 China Hebei Parallel Robot and Electromechanical System Laboratory Yanshan University Hebei Qinhuangdao066004 China

A calibration method of linear structure light based on a planar target is proposed to achieve high accuracy calibration of cross structured light. According to the Blinn-Phong illumination model, when laser stripe is projected on the edge of feature points on the planar target, the laser stripe cross profile does not follow the Gaussian distribution, and the Steger algorithm cannot accurately extract the laser stripe center. In order to solve this problem, firstly, extracted all laser stripe centers, removed the center points at the edge of feature points, and carried out fitting for the retained center points. In the second step, the image moments are used to extract the position of the intersection point of the cross structured light in the image, and the line fitting is carried out with the Ransac algorithm. Experimental results show that the proposed method can effectively improve the calibration accuracy of linear structure light. © 2022, The Authors. All rights reserved.

关键词： Calibration

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