The Experts below are selected from a list of 1959 Experts worldwide ranked by ideXlab platform
Zhinan Yang - One of the best experts on this subject based on the ideXlab platform.
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development of and perspective on high performance nanostructured bainitic bearing steel
Engineering, 2019Co-Authors: Fucheng Zhang, Zhinan YangAbstract:Abstract Bearings are the most important component of nearly all mechanical equipment, as they guarantee the steady running of the equipment, which is especially important for high-end equipment such as high-speed trains and shield Tunneling Machines. Requirements regarding the quality of bearings are increasing with the rapid development in technology. A country’s bearings manufacturing level directly reflects the level of that country’s steel metallurgy and machinery manufacturing. The performance of the bearing steel is the critical factor that determines the quality of a bearing. The development of new bearing steel with higher performance is the ambition of material researchers and the expectation of the manufacturing industry. Many famous bearing manufacturing enterprises are competing to develop the new generation of bearing steel. Nanostructured bainitic bearing steel (NBBS), which is a newly developed bearing steel, not only possesses high strength and toughness, but also exhibits excellent wear resistance and rolling contact fatigue (RCF) resistance. In recent years, relevant achievements in NBBS in China have led to significant progress in this field. NBBS was first used in China to manufacture large bearings for wind turbines and heavy-duty bearings, with excellent performance. As a result, NBBS and its corresponding heat-treatment process have been included in the national and industry standards for the first time. The bearing industry considers the exploitation of NBBS to be epoch-making, and has termed this kind of bearing as the second generation of bainitic bearing. In this paper, the development of NBBS is reviewed in detail, including its advantages and disadvantages. Further research directions for NBBS are also proposed.
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Development of and Perspective on High-Performance Nanostructured Bainitic Bearing Steel
Elsevier, 2019Co-Authors: Fucheng Zhang, Zhinan YangAbstract:Bearings are the most important component of nearly all mechanical equipment, as they guarantee the steady running of the equipment, which is especially important for high-end equipment such as high-speed trains and shield Tunneling Machines. Requirements regarding the quality of bearings are increasing with the rapid development in technology. A country’s bearings manufacturing level directly reflects the level of that country’s steel metallurgy and machinery manufacturing. The performance of the bearing steel is the critical factor that determines the quality of a bearing. The development of new bearing steel with higher performance is the ambition of material researchers and the expectation of the manufacturing industry. Many famous bearing manufacturing enterprises are competing to develop the new generation of bearing steel. Nanostructured bainitic bearing steel (NBBS), which is a newly developed bearing steel, not only possesses high strength and toughness, but also exhibits excellent wear resistance and rolling contact fatigue (RCF) resistance. In recent years, relevant achievements in NBBS in China have led to significant progress in this field. NBBS was first used in China to manufacture large bearings for wind turbines and heavy-duty bearings, with excellent performance. As a result, NBBS and its corresponding heat-treatment process have been included in the national and industry standards for the first time. The bearing industry considers the exploitation of NBBS to be epoch-making, and has termed this kind of bearing as the second generation of bainitic bearing. In this paper, the development of NBBS is reviewed in detail, including its advantages and disadvantages. Further research directions for NBBS are also proposed. Keywords: Nanostructured bainitic bearing steel, Bearing steel, Nanostructured bainite, Developmen
Yan Wei Zhang - One of the best experts on this subject based on the ideXlab platform.
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multi objective optimization of a parallel fine tuning manipulator for segment assembly robots in shield Tunneling Machines
2017Co-Authors: Guo Hua Cui, Yan Wei Zhang, Haidong Zhou, Haibin ZhouAbstract:A new 6-DOF serial/parallel hybrid segment assembly robot that includes a 3-DOF redundant parallel orientation fine-tuning manipulator is developed. Redundancy can, in general, improve the ability and performance of parallel manipulators by implementing the redundant degree of freedom to optimize the objective function. A multi-objective optimization model of the proposed manipulator is likewise established with consideration of kinematic and dynamic dexterity, load-bearing capacity, stiffness, and actuating force equilibrium. To accomplish optimization, a new multi-objective optimization method is proposed using the application Isight, which integrates various engineering softwares. Results indicate that this method can automatically accomplish the calculation of the kinematic and dynamic performance index, modeling, and solving using Isight. Thus, decision makers can select the proper optimal solution based on the obtained Pareto plot and Pareto frontier. Finally, optimizing its design variables considerably improves the performance of the proposed parallel manipulator.
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Local Stiffness and Dexterity Analysis of a 3-SPS-S Orientation Fine-Tuning Manipulator for Segment Assembly Robots in Shield Tunneling Machines
Applied Mechanics and Materials, 2011Co-Authors: Yan Wei Zhang, Bin Wei, Guo Hua Cui, Nan WangAbstract:This study focus on the stiffness analysis of a three-DOF orientation fine-tuning manipulator for segment assembly robots in shield Tunneling Machines. In underground space development, shield Tunneling Machines are widely used in subway tunnels, channel tunnels and other kinds of tunnels. As one of the key sub-devices in a shield Tunneling machine, a segment assembly robot is used to automatically form the segment lining. In order to evaluate the operational capacity, an analysis of the inverse kinematics is conducted. The local performance atlas, including stiffness and dexterity, are investigated. The results show that the proposed orientation fine-tuning manipulator has good performances and it can meet the needs.
Nan Wang - One of the best experts on this subject based on the ideXlab platform.
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Local Stiffness and Dexterity Analysis of a 3-SPS-S Orientation Fine-Tuning Manipulator for Segment Assembly Robots in Shield Tunneling Machines
Applied Mechanics and Materials, 2011Co-Authors: Yan Wei Zhang, Bin Wei, Guo Hua Cui, Nan WangAbstract:This study focus on the stiffness analysis of a three-DOF orientation fine-tuning manipulator for segment assembly robots in shield Tunneling Machines. In underground space development, shield Tunneling Machines are widely used in subway tunnels, channel tunnels and other kinds of tunnels. As one of the key sub-devices in a shield Tunneling machine, a segment assembly robot is used to automatically form the segment lining. In order to evaluate the operational capacity, an analysis of the inverse kinematics is conducted. The local performance atlas, including stiffness and dexterity, are investigated. The results show that the proposed orientation fine-tuning manipulator has good performances and it can meet the needs.
Guo Hua Cui - One of the best experts on this subject based on the ideXlab platform.
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multi objective optimization of a parallel fine tuning manipulator for segment assembly robots in shield Tunneling Machines
2017Co-Authors: Guo Hua Cui, Yan Wei Zhang, Haidong Zhou, Haibin ZhouAbstract:A new 6-DOF serial/parallel hybrid segment assembly robot that includes a 3-DOF redundant parallel orientation fine-tuning manipulator is developed. Redundancy can, in general, improve the ability and performance of parallel manipulators by implementing the redundant degree of freedom to optimize the objective function. A multi-objective optimization model of the proposed manipulator is likewise established with consideration of kinematic and dynamic dexterity, load-bearing capacity, stiffness, and actuating force equilibrium. To accomplish optimization, a new multi-objective optimization method is proposed using the application Isight, which integrates various engineering softwares. Results indicate that this method can automatically accomplish the calculation of the kinematic and dynamic performance index, modeling, and solving using Isight. Thus, decision makers can select the proper optimal solution based on the obtained Pareto plot and Pareto frontier. Finally, optimizing its design variables considerably improves the performance of the proposed parallel manipulator.
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Local Stiffness and Dexterity Analysis of a 3-SPS-S Orientation Fine-Tuning Manipulator for Segment Assembly Robots in Shield Tunneling Machines
Applied Mechanics and Materials, 2011Co-Authors: Yan Wei Zhang, Bin Wei, Guo Hua Cui, Nan WangAbstract:This study focus on the stiffness analysis of a three-DOF orientation fine-tuning manipulator for segment assembly robots in shield Tunneling Machines. In underground space development, shield Tunneling Machines are widely used in subway tunnels, channel tunnels and other kinds of tunnels. As one of the key sub-devices in a shield Tunneling machine, a segment assembly robot is used to automatically form the segment lining. In order to evaluate the operational capacity, an analysis of the inverse kinematics is conducted. The local performance atlas, including stiffness and dexterity, are investigated. The results show that the proposed orientation fine-tuning manipulator has good performances and it can meet the needs.
Kongshu Deng - One of the best experts on this subject based on the ideXlab platform.
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a load balancing oriented symmetrical uneven layout design for thrust system in Tunneling Machines under composite ground
Proceedings of the Institution of Mechanical Engineers Part C: Journal of Mechanical Engineering Science, 2019Co-Authors: Kongshu Deng, Zhurong Yin, Bangliang Meng, Cong XiangAbstract:Mechanized Tunneling is characterized by high automation, efficiency, safety, and environment-friendly during tunnel construction progress. Studies to improve the force transmission performance of ...
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a force transmission assessment method for thrust system in shield Machines based on the relative coefficient in compound ground
Automation in Construction, 2017Co-Authors: Kongshu Deng, Bangliang Meng, Cong Xiang, Huangong WangAbstract:Abstract An evaluation method for force transmission in the thrust system of Tunneling Machines in compound ground was investigated in this study. First, the mechanical model for a pushing system in heterogeneous ground was constructed. Then, the relative coefficient of eccentricity on a conical surface was determined based on the mechanical model. Subsequently, the uniformity degree of force transmission in the thrust system was measured using the relative thrust coefficients of eccentricity. Eventually, the performance of force transmission under various arrangements with an equal number of jacks was discussed in detail by applying the conical model of eccentricity to the thrust mechanism of a Tunneling machine used in engineering projects. The 3D parameter models for the thrust system of an earth pressure balance shield machine (diameter: 6.34 m) were established using SolidWorks. In addition, a propelling system with 22 hydraulic cylinders was simulated via the automatic dynamic analysis of mechanical systems (ADAMS). Results of the numerical analysis agree well with those simulated by ADAMS. The results provide a theoretical basis and support for choosing a non-equidistant driving system in a composite stratum.
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Adaptability to stratum characteristics for layout of thrust system in Tunneling Machines based on variation coefficient
Advances in Mechanical Engineering, 2016Co-Authors: Kongshu Deng, Meng Bangliang, Xiang CongAbstract:This study aims to investigate the characteristics of adaptability to stratum for thrust system in Tunneling Machines in composite stratum. Initially, variation coefficient thrust model has been co...
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on the analysis of force transmission performance for the thrust systems of shield Tunneling Machines
International Conference on Intelligent Robotics and Applications, 2009Co-Authors: Kongshu Deng, Liping Wang, Xiaoqiang Tang, Pingfa Feng, Xu ChenAbstract:Earth pressure balance is normally used in excavating Tunneling due to high automation, quick construction, environmental friendliness, etc. Based on minimum mean square error, optimized mechanical models for non-group and group thrust systems of the earth pressure balance have been constructed. Through the offset load, the force transmission performances for the two thrust systems were studied, respectively. By applying force ellipse to the thrust system of a shield machine, the difference between the two configurations was analyzed. It provides an important theoretical foundation for the development and design of thrust systems.
