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16. A Spatial Layout Method of Robots Relative to Operating Space Based on Its Flexible Workspace Simulation

Author

Wang, Jianhua, Li, Longfei, Liu, Zhifeng, Xu, Jingjing, Yang, Congbin, Cheng, Qiang, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Liu, Xin-Jun, editor, Nie, Zhenguo, editor, Yu, Jingjun, editor, Xie, Fugui, editor, and Song, Rui, editor

Published
2021
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18. Study on gear contact stiffness and backlash of harmonic drive based on fractal theory.

Author

Yang, Congbin, Ma, Honglie, Zhang, Tao, Liu, Zhifeng, and Cheng, Qiang

Abstract

Contact stiffness and backlash in the harmonic drive significantly impact a robot's positioning accuracy and vibration characteristics. The height of the harmonic drive tooth pair is typically less than 1 mm, making the measurement and modeling of backlash and contact stiffness inherently complex. This paper proposes a contact stiffness and backlash model by establishing a correlation between fractal parameters and tooth contact load. To obtain the fractal roughness parameters of the real machined tooth surface, a combination of a noncontact optical profiler and the RMS method is employed. Subsequently, the study explores the influence of rough tooth surface and contact force fractal parameters on contact stiffness and gear backlash. The results demonstrate the substantial impact of surface topography parameters and contact force on contact stiffness and backlash. Specifically, an increase in the fractal dimension correlates with a reduction in gear backlash and contact stiffness. Conversely, the fractal roughness parameter exhibits the opposite effect. Notably, an increase in contact force enhances contact stiffness. [ABSTRACT FROM AUTHOR]

Published
2024
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30. Performance Analysis and Restrictor Structure Improvement of an Internal Feedback Hydrostatic Turntable Oil Pad Considering Internal Flow.

Author

Yang, Congbin, Shao, Shuaihua, Li, Ying, Liu, Zhifeng, Zhao, Yongsheng, and Ma, Honglie

Subjects
*PUBLIC works, *FINITE difference method, *TURNTABLES, *FLOW coefficient, *REYNOLDS equations
Abstract

This paper provides a comprehensive exploration of the operational mechanism of an internal feedback hydrostatic turntable. It employs a self‐compensating gap restrictor mechanism, resulting in heightened load capacity and stiffness. In this paper, the concept of internal flow is innovatively introduced. Subsequently, the Reynolds equation is solved using the finite difference method. This methodology offers a more precise and efficient assessment of the load‐bearing performance of the oil pad within the turntable. Then this paper further investigates the influence of the internal flow coefficient and pressure ratio on oil pad performance, encompassing aspects like load capacity, stiffness, and flow rate. Ultimately, optimal parameters are selected to improve the structure of the gap restrictor, considering various operational scenarios. In conclusion, the method adopted in this study not only improves the calculation accuracy and efficiency but also improves the structure and performance of the oil pad. [ABSTRACT FROM AUTHOR]

Published
2024
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49. Contact stiffness attenuation model of bolted joint based on time-varying uncertainty

Author

Yang Congbin, Li Ying, Zhang Tao, Wu Hongchao, Niu Nana, and Zhao Yongsheng

Subjects
business.industry, Computer science, Mechanical Engineering, Attenuation, Joint surface, Stiffness, Structural engineering, Industrial and Manufacturing Engineering, Computer Science Applications, Nonlinear system, Control and Systems Engineering, Bolted joint, medicine, Initial value problem, Attenuation law, medicine.symptom, business, Software, Reliability (statistics)
Abstract

Various deterministic and uncertain factors are widely present in mechanical equipment and their working conditions. Attenuation of the contact stiffness of bolted joints caused by bolt loosening will directly affect the dynamic characteristics of the joint surface and the working state of the equipment. This paper proposes a contact stiffness attenuation model that considers time-varying uncertainty of the bolt pre-tightening force as a theoretical basis for designing the initial bolt pre-tightening force and secondary tightening strategies. First, the microscopic contact mechanism of the bolted joint surface was revealed, and then a joint contact load and contact stiffness model based on Hertz contact theory and fractal theory was established. A nonlinear mechanical model of the bolted contact surface was obtained. Considering the decrease in bolt pre-tightening force during service, a contact stiffness attenuation law for bolted joints is explored, and a model of the connection reliability of group bolt joints with time-varying uncertainty is established. The bolt pre-tightening force of a railway locomotive was taken as an example and the connection reliability of group bolt structures was predicted, and it is defined that the bolted structure fails when the contact stiffness drops to 80% of the initial value, and the reliability of the group bolts will drop sharply on the 15th day after service, and will almost completely fail on the 22nd day. The proposed theory improves the accuracy of contact modeling and provides a new direction for bolt tightening strategies.

Published
2021

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