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学者姓名:刘志峰
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Abstract :
A large-scale manufacturing workshop includes a wide variety and a large amount of equipment. When equipment is mapped as a digital twin (DT) model, the DT model has complex and implicit or non-hierarchical relationships, which makes the development of a DT workshop system (DTWS) for a manufacturing plant challenging. To address this problem, this paper proposes a rapid construction method of equipment model (RCMEM) for a discrete manufacturing DT workshop system, which can meet the requirements of complex manufacturing business scenarios, improve the efficiency and quality of the DT model construction at the equipment level, and form an efficient equipment model construction method. First, a DT object (DTO), which represents a basic unit of the DT model, is defined. The DTO is used to derive the DT model at the equipment level. The DTO collects and wraps generalization-capable functions from equipment into components, and geometric, functional, and communicative descriptions are combined into a single model. The DT model can increase the scalability, reusability, and modeling quality by reusing the DTO capabilities. Further, a general construction process of the DTO model of multi-axis computer numerical control (CNC) machines is presented. This process standardizes the common capabilities of the equipment models and minimizes the construction time of machines' DT models. Furthermore, a rapid mounting and communication configuration mechanism (RMCCM) is proposed. This mechanism enables fast DTO network communication and improves interoperability in a multi-source data environment. This paper also proposes a DTWorks Software development kit, which can help developers to build digital factory standalone applications. The RCMEM is implemented into the DTWorks. Finally, a real DTWS case is used to examine the differences in equipment model building before and after the application of the RCMEM. The results demonstrate the good effectiveness of the RCMEM in complex business settings.
Keyword :
Rapid construction method Rapid construction method System framework System framework Digital twin system Digital twin system Digital twin Digital twin
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GB/T 7714 | Zhang, Yueze , Zhang, Caixia , Yan, Jun et al. Rapid construction method of equipment model for discrete manufacturing digital twin workshop system [J]. | ROBOTICS AND COMPUTER-INTEGRATED MANUFACTURING , 2022 , 75 . |
MLA | Zhang, Yueze et al. "Rapid construction method of equipment model for discrete manufacturing digital twin workshop system" . | ROBOTICS AND COMPUTER-INTEGRATED MANUFACTURING 75 (2022) . |
APA | Zhang, Yueze , Zhang, Caixia , Yan, Jun , Yang, Congbin , Liu, Zhifeng . Rapid construction method of equipment model for discrete manufacturing digital twin workshop system . | ROBOTICS AND COMPUTER-INTEGRATED MANUFACTURING , 2022 , 75 . |
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Abstract :
Hydrophilic polymer coatings on artificial implants generate excellent tribological properties. The friction properties of polymer coatings are affected by salt ion factors. Herein, the atomic force microscopy (AFM) was used to show that the superlubricity was achieved between poly(vinylphosphonic acid) (PVPA)-modified Ti6Al4V and polystyrene (PS) microsphere probe lubricated with monovalent salt solutions (LiCl, NaCl, KCl, and CsCl). Considering that adhesion is an important cause of friction changes, the AFM was further utilized to obtain adhesion between friction pairs in different salt solutions. The results indicated that the larger the cation radius in the lubricant, the smaller the adhesion, and the lower the friction coefficient of the PVPA coating. The electrostatic interaction between the PVPA and one-valence cations in lubricants was analyzed by the molecular dynamics (MD) simulation as it was found to be the main influencing factor of the adhesion. Combined analysis results of friction and adhesion indicated that by adjusting the size of cation radius in lubricant, the adhesion between the tribo-pairs can be changed, and eventually the magnitude of friction can be affected. This study opens up a new avenue for analyzing the friction characteristics of hydrophilic polymer coatings from the perspective of intermolecular forces.
Keyword :
atomic force microscopy (AFM) atomic force microscopy (AFM) poly(vinylphosphonic acid) (PVPA) poly(vinylphosphonic acid) (PVPA) molecular dynamics (MD) simulation molecular dynamics (MD) simulation superlubricity superlubricity cation cation adhesion adhesion
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GB/T 7714 | Cai, Hongyun , Zhang, Caixia , Li, Fuping et al. Study on the microcosmic superlubricity mechanism of PVPA affected by metal cations [J]. | FRICTION , 2022 , 11 (7) : 1150-1164 . |
MLA | Cai, Hongyun et al. "Study on the microcosmic superlubricity mechanism of PVPA affected by metal cations" . | FRICTION 11 . 7 (2022) : 1150-1164 . |
APA | Cai, Hongyun , Zhang, Caixia , Li, Fuping , Liu, Mengmeng , Zhang, Tao , Chu, Hongyan et al. Study on the microcosmic superlubricity mechanism of PVPA affected by metal cations . | FRICTION , 2022 , 11 (7) , 1150-1164 . |
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Abstract :
Accurate evaluation of preload in system with double-bolted connections is critical for the service performance of engineering structures or equipment. However, the theoretical framework for assessing preload is imperfect. An equivalent approach from the tightening process of double-bolted joints to second-order spectral problem of the energy-dependent potential is firstly established. This paper proposes a novel nonlinear model of bolt preload considering physical and geometric parameters by proving the completely integrability of systems used bolted connections. The experimental device for hmeasuring displacement and bolt preload was developed to verify the accuracy of proposed model. Results show that the maximum relative error is not more than 3%. Finally, the influences of elastic modulus, density, holes spacing, and height on preload are analyzed. (c) 2021 Elsevier Inc. All rights reserved.
Keyword :
Bolted connection Bolted connection Preload Preload Second-order spectral problem Second-order spectral problem Integrability Integrability
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GB/T 7714 | Liu, Zhifeng , Wang, Yuezhen , Dong, Xiangmin et al. A novel model for evaluating preload based on spectral problem in system with double-bolted connections [J]. | APPLIED MATHEMATICAL MODELLING , 2022 , 102 : 21-34 . |
MLA | Liu, Zhifeng et al. "A novel model for evaluating preload based on spectral problem in system with double-bolted connections" . | APPLIED MATHEMATICAL MODELLING 102 (2022) : 21-34 . |
APA | Liu, Zhifeng , Wang, Yuezhen , Dong, Xiangmin , Zhang, Caixia , Li, Ying . A novel model for evaluating preload based on spectral problem in system with double-bolted connections . | APPLIED MATHEMATICAL MODELLING , 2022 , 102 , 21-34 . |
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Abstract :
The superior performance of machining large parts with the free-form surface is demonstrated by a five-axis gantry machine tool composed of a gantry mainframe and a milling head. A turntable is used to adjust the position of the workpiece rather than a linear guideway when machining impellers or integral turbines. Furthermore, collisions between adjacent blades are almost unavoidable in the machining region, which is relatively narrow for milling heads. The majority of existing methods attempt to solve the problem by changing the tool's tilt angle. However, when an end-mill cutter is employed, this method will deteriorate surface quality and reduce efficiency. On the condition that the milling head has three rotary axes (TRA), a novel NC code generation method with a fixed tool orientation vector for narrow space surfaces is proposed in this paper. When the geometrical model, considered a supplementary condition, is combined with the kinematics model, an inverse kinematics solution to a general multi-axis gantry machine tool with a TRA milling head is obtained. The problem of multi-axis coupling in the inverse kinematics model is solved by combining the iteration method and geometrical model. In the narrow space for a milling head, the redundant degree of freedom, provided by a machine tool equipped with a TRA milling head, enables adjusting the posture of the milling head without changing the tool orientation vector. Feature points are extracted by preprocessing points selected from machined parts and the TRA milling head to choose the feasible posture and simulate the machining process. Collisions in the narrow space are successfully avoided throughout the cutting process. The NC code generation method is verified on CAM software and cut experiments, proven effective in this paper.
Keyword :
Collision avoidance Collision avoidance Tool path generation method Tool path generation method Inverse kinematics Inverse kinematics Five-axis machining Five-axis machining
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GB/T 7714 | Cao, Zirui , Zhao, Yongsheng , Wang, Ruiyao et al. A novel collision-free NC code generation method with fixed tool orientation vector using the geometric decoupling strategy based on the three rotary axes milling head [J]. | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2022 , 122 (7-8) : 3255-3279 . |
MLA | Cao, Zirui et al. "A novel collision-free NC code generation method with fixed tool orientation vector using the geometric decoupling strategy based on the three rotary axes milling head" . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 122 . 7-8 (2022) : 3255-3279 . |
APA | Cao, Zirui , Zhao, Yongsheng , Wang, Ruiyao , Yang, Congbin , Wang, Yida , Liu, Zhifeng . A novel collision-free NC code generation method with fixed tool orientation vector using the geometric decoupling strategy based on the three rotary axes milling head . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2022 , 122 (7-8) , 3255-3279 . |
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Abstract :
Facing some special operating environments or conditions, existing control methods for the peg-in-hole assembly guided by robots always have their own disadvantages, for example, low efficiency or poor adaptability. For the above problem, in this article, a new circular peg-in-hole assembly control strategy is proposed for the 6-Degree of Freedom (DOF) robot based on hybrid visual measurements, avoiding peg-in-hole contacts during the robotic operation. In the strategy, the pose of the monocular camera mounted at the end-effector is adaptively adjusted to improve the image quality through an algorithm based on the rough pose measurement of the target hole by the binocular camera; the accurate 3-D pose of the hole is determined by an algorithm based on processing of high-quality images and the compensation of the orientation error. Combined with the robotic collision-free path planning, the automatic peg-in-hole assembly can be implemented in real setting. The assembly precision of the robotic system based on the proposed method is validated and discussed based on experimental results. Then, the minimal peg-in-hole interval relative to the alignment error is modeled through the spatial relation analysis to analyze the applicable condition of the robotic system with the control strategy. Also, the reliability of the proposed strategy is verified through experimental tests under some applicable conditions. Finally, suggestions and plans of future works are discussed for further extension of the application area of the proposed strategy, such as fields of precision and ultraprecision manufacturing. This contribution has the major significance on the automatic peg-in-hole assembly under 3-D operating environment.
Keyword :
assembly gap assembly gap Force Force Costs Costs Sensors Sensors Collision avoidance Collision avoidance End effectors End effectors Cameras Cameras hybrid visual system hybrid visual system applicable condition applicable condition peg-in-hole assembly peg-in-hole assembly Robots Robots 6-Degree of Freedom (DOF) robot 6-Degree of Freedom (DOF) robot
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GB/T 7714 | Xu, Jingjing , Liu, Kang , Pei, Yanhu et al. A Noncontact Control Strategy for Circular Peg-in-Hole Assembly Guided by the 6-DOF Robot Based on Hybrid Vision [J]. | IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT , 2022 , 71 . |
MLA | Xu, Jingjing et al. "A Noncontact Control Strategy for Circular Peg-in-Hole Assembly Guided by the 6-DOF Robot Based on Hybrid Vision" . | IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT 71 (2022) . |
APA | Xu, Jingjing , Liu, Kang , Pei, Yanhu , Yang, Congbin , Cheng, Yanhong , Liu, Zhifeng . A Noncontact Control Strategy for Circular Peg-in-Hole Assembly Guided by the 6-DOF Robot Based on Hybrid Vision . | IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT , 2022 , 71 . |
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Abstract :
Bolted joints are one of the most common fastening methods in engineering applications. To meet the requirements of structural parts, the torque method is often used for controlling the bolted joint performance. However, only a few investigations have been carried out on the conversion efficiency of bolt torque to the tensile force, leading to uncertainty and potential safety hazards during the bolt tightening. In order to study the input torque distribution and overcome problems caused by the Motosh method and experimental investigations, a new energy-based torque distribution model is established in the present study. In the proposed model, numerous affecting parameters, including the connector compression work, effective bearing radius, effective thread contact radius, and spiral angle are considered. Then a parameterized thread mesh model using finite element technology is proposed to analyze the influence of different bolt friction coefficients on the bolt tightening process. Based on 16 types of tightening analyses, it is concluded that as bolt friction coefficient increases, the corresponding torque conversion rate decreases from 14.45% to 7.89%. Compared with the Motosh method, the torque conversion rate obtained by the proposed method is relatively large, which makes the actual pre-tightening force larger than the design value. However, there is still a possibility of bolt failure.
Keyword :
energy method energy method input torque distribution input torque distribution bolt bolt different friction coefficients different friction coefficients contact contact FEA FEA
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GB/T 7714 | Jiang, Kai , Liu, Zhifeng , Wang, Yida et al. Effects of Different Friction Coefficients on Input Torque Distribution in the Bolt Tightening Process Based on the Energy Method [J]. | JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME , 2022 , 144 (7) . |
MLA | Jiang, Kai et al. "Effects of Different Friction Coefficients on Input Torque Distribution in the Bolt Tightening Process Based on the Energy Method" . | JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME 144 . 7 (2022) . |
APA | Jiang, Kai , Liu, Zhifeng , Wang, Yida , Tian, Yang , Zhang, Caixia , Zhang, Tao . Effects of Different Friction Coefficients on Input Torque Distribution in the Bolt Tightening Process Based on the Energy Method . | JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME , 2022 , 144 (7) . |
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Abstract :
以智能化、绿色化作为机床产业的标志和发展方向,介绍了智能绿色制造技术在机床装备中的应用概况.在此基础上,围绕模块化功能设计、智能化工艺规划技术、过程监控和装备性能预测感知技术及智能数控系统和智能控制技术,对智能绿色机床装备技术研究进行了综述,并对先进智能绿色制造技术在机床中的具体应用和国际上机床的发展现状展开了详细分析.旨在通过汲取其他国家在智能绿色制造领域的发展经验和先进技术,以不断增强我国高端机床的行业竞争力.
Keyword :
技术分析 技术分析 模块化功能设计 模块化功能设计 机床装备 机床装备 应用发展 应用发展 智能化工艺规划 智能化工艺规划 智能绿色制造 智能绿色制造
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GB/T 7714 | 程强 , 徐文祥 , 刘志峰 et al. 面向智能绿色制造的机床装备研究综述 [J]. | 华中科技大学学报(自然科学版) , 2022 , 50 (06) : 31-38 . |
MLA | 程强 et al. "面向智能绿色制造的机床装备研究综述" . | 华中科技大学学报(自然科学版) 50 . 06 (2022) : 31-38 . |
APA | 程强 , 徐文祥 , 刘志峰 , 张妤 . 面向智能绿色制造的机床装备研究综述 . | 华中科技大学学报(自然科学版) , 2022 , 50 (06) , 31-38 . |
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Abstract :
提升重型数控机床的加工精度是高端装备领域的研究热点,然而关于基础沉降变形对机床精度的影响这一问题却少有研究。为了研究由基础沉降变形引起重型数控机床加工精度变化的规律,基于欧拉伯努利梁单元理论,考虑基础和机床相互耦合作用关系,建立起机床结构-基础系统的一体化变形协调方程,以横梁中点位姿变化为目标,进行整体刚度矩阵求解过程中的节点坐标标定方案分析;根据相似理论,构造重型数控机床-基础系统的缩尺模型,分析设计的缩尺模型和机床原尺模型之间静力位移变形关系,给出缩尺模型和原尺模型的映射规律,为有效解决基础沉降引起的机床精度变化和精度补偿提供依据和技术支撑。
Keyword :
缩尺模型 缩尺模型 基础沉降 基础沉降 梁单元 梁单元 相似理论 相似理论 重型数控机床 重型数控机床
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GB/T 7714 | 张建涛 , 刘志峰 , 李彦生 et al. 基于相似理论的重型数控机床-基础系统位移变形研究 [J]. | 机械工程学报 , 2022 , 58 (07) : 309-316 . |
MLA | 张建涛 et al. "基于相似理论的重型数控机床-基础系统位移变形研究" . | 机械工程学报 58 . 07 (2022) : 309-316 . |
APA | 张建涛 , 刘志峰 , 李彦生 , 姜凯 , 杨聪彬 , 张彩霞 . 基于相似理论的重型数控机床-基础系统位移变形研究 . | 机械工程学报 , 2022 , 58 (07) , 309-316 . |
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Abstract :
为提高滚珠丝杠副的定位精度,提出了一种复合载荷作用下考虑滚珠几何误差的双螺母滚珠丝杠副载荷分布模型,分析了在不同轴向载荷和径向载荷复合作用下所有滚珠接触载荷分布状况,在此基础上分析了滚珠几何误差对滚珠动静态接触载荷分布的影响。仿真分析结果表明:本文提出的载荷分布模型对提高滚珠丝杠副的位置精度预测及其定位误差补偿有较好的参考意义。
Keyword :
滚珠丝杠副 滚珠丝杠副 结构误差 结构误差 双螺母 双螺母 接触载荷 接触载荷
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GB/T 7714 | 程强 , 王畅 , 齐宝宝 et al. 虑及结构参数误差的滚珠丝杠接触载荷建模与分析 [J]. | 吉林大学学报(工学版) , 2022 , 52 (02) : 353-360 . |
MLA | 程强 et al. "虑及结构参数误差的滚珠丝杠接触载荷建模与分析" . | 吉林大学学报(工学版) 52 . 02 (2022) : 353-360 . |
APA | 程强 , 王畅 , 齐宝宝 , 张彩霞 , 杨聪彬 , 刘志峰 . 虑及结构参数误差的滚珠丝杠接触载荷建模与分析 . | 吉林大学学报(工学版) , 2022 , 52 (02) , 353-360 . |
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Abstract :
长期以来,我国以数控机床为代表的装备制造业重点产品技术差距缺乏量化测度研究,导致无法用客观的表征方法来衡量和评价数控机床技术发展水平。针对以上问题,从共性技术、典型主机产品、数控系统和关键功能部件4个方向出发进行技术要素项细分,构建了对标世界先进领先水平的高档数控机床技术差距评价体系;提出我国机床技术水平与国际(地区)先进水平的年代差距量化表征方法;建立了基于模糊数据处理的分项技术水平评价模型、共性技术产品水平评价模型和产品关键技术综合评价模型。最后,基于该体系进行了大样本数据调研,基于评价模型进行了机床技术年代差距量化分析,评价结果可为政府科学决策及行业发展规划提供重要支撑。
Keyword :
机床技术差距 机床技术差距 模糊数据处理 模糊数据处理 评价体系 评价体系 差距量化表征 差距量化表征 技术评价模型 技术评价模型
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GB/T 7714 | 苏铮 , 李丽 , 许静静 et al. 基于模糊数据处理的我国机床技术差距评价体系 [J]. | 制造技术与机床 , 2022 , PageCount-页数: 8 (06) : 84-91 . |
MLA | 苏铮 et al. "基于模糊数据处理的我国机床技术差距评价体系" . | 制造技术与机床 PageCount-页数: 8 . 06 (2022) : 84-91 . |
APA | 苏铮 , 李丽 , 许静静 , 刘炳业 , 刘志峰 , 杨聪彬 . 基于模糊数据处理的我国机床技术差距评价体系 . | 制造技术与机床 , 2022 , PageCount-页数: 8 (06) , 84-91 . |
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