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学者姓名：刘志峰
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Abstract ：
There are many bolted structures in heavy-duty gantry machine tools, and the structural performance of these components greatly impacts the dynamic properties of the entire machine. Firstly, based on the fractal theory, a bolt preload-contact stiffness and damping model was established by characterizing the load, deformation and strain energies of the bolted joint surfaces. In order to precisely forecast the dynamic features, a dynamic response model of the tip point of the gantry machine was first proposed by adopting the multi-body system transfer matrix method. The feasibility of the contact mechanism and the dynamic response model were verified by modal tests respectively. Finally, the effect of bolt preload loosening on the dynamic response of the whole machine is analyzed. In the scaled model of the gantry machine, when the bolt preloads on the lathe bed-column and crossing beam-column joint surfaces are loosened by 30 %, the displacement response of the tool tip point increases by 41.2 % and 40.1 % respectively, which indicates that the effect of lathe bed-column interface is more significant. This paper seeks out the weak link in the gantry machine tool, which helps to carry out the design optimization of its assembly processing afterward.
Keyword ：
Multibody systems transfer matrix method Multibody systems transfer matrix method Machine dynamics Machine dynamics Bolted joint surface property Bolted joint surface property Fractal theory Fractal theory Gantry machine tool Gantry machine tool
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| GB/T 7714 | Liu, Zhifeng , Wu, Yiming , Zhang, Tao et al. Analysis of dynamic characteristics of heavy-duty gantry machine tool in bolt loosening [J]. | PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY , 2025 , 94 : 486-504 . |
| MLA | Liu, Zhifeng et al. "Analysis of dynamic characteristics of heavy-duty gantry machine tool in bolt loosening" . | PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY 94 (2025) : 486-504 . |
| APA | Liu, Zhifeng , Wu, Yiming , Zhang, Tao , Yang, Congbin , Li, Ying , Xu, Jingjing . Analysis of dynamic characteristics of heavy-duty gantry machine tool in bolt loosening . | PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY , 2025 , 94 , 486-504 . |
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Abstract ：
Threaded fasteners are one of the most commonly used connection methods for mechanical structures. Its primary function is to generate appropriate clamping forces and fasten the connected parts. An inappropriate preload can cause loosening, fatigue fracture, and other problems. This will affect the safety and reliability of mechanical equipment. The precise control of the preload has become a critical issue in mechanical assembly processes. Over the past few decades, various tightening measures and methods have been proposed to address this issue. However, many problems continue to exist with practical applications that have not been reviewed comprehensively and systematically. First, various control methods were summarized systematically, and their advantages and disadvantages in engineering applications were analyzed. Torque control is the most widely used tightening method owing to its simple operation and low cost. Therefore, the research on the torque control method was summarized systematically from three aspects: the torque-preload correlation formula, effective friction radius, and friction characteristics during tightening. In addition, the special circumstances that may increase preload uncertainty were discussed. Finally, based on a summary of the current research status, the prospects for future research were discussed. This study would aid researchers in extensively understanding the problems in preload control.
Keyword ：
Threaded fasteners Threaded fasteners Torque control method Torque control method Friction characteristics Friction characteristics Preload Preload Tightening method Tightening method
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| GB/T 7714 | Yan, Xing , Liu, Zhifeng , Zheng, Mingpo et al. Preload Control Method of Threaded Fasteners: A Review [J]. | CHINESE JOURNAL OF MECHANICAL ENGINEERING , 2024 , 37 (1) . |
| MLA | Yan, Xing et al. "Preload Control Method of Threaded Fasteners: A Review" . | CHINESE JOURNAL OF MECHANICAL ENGINEERING 37 . 1 (2024) . |
| APA | Yan, Xing , Liu, Zhifeng , Zheng, Mingpo , Li, Ying , Wang, Yuezhen , Chen, Wentao . Preload Control Method of Threaded Fasteners: A Review . | CHINESE JOURNAL OF MECHANICAL ENGINEERING , 2024 , 37 (1) . |
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Abstract ：
A method has been developed to quantify the bearing surface friction coefficient in bolted joints based on the mechanics of the tightening process. By measuring the surface topography under different tightening torques, a strong correlation between the variation of the microscopic topography and the friction coefficient was revealed. The friction coefficient initially decreases and subsequently increases due to surface wear and microstructural transformations. A genetic algorithm (GA) and backpropagation neural network (BP) were employed to create a predictive model, optimizing network parameters for enhanced learning efficiency and accuracy. The experimentally validated GA-BP prediction model forecasts friction behavior with a maximum relative error of 3.57 %, offering valuable insights for the design and optimization of bolted joints.
Keyword ：
Friction coefficient Friction coefficient GA-BP prediction model GA-BP prediction model Bolted joints Bolted joints Surface topography Surface topography
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| GB/T 7714 | Chen, Wentao , Li, Ying , Liu, Zhifeng et al. Prediction model for bearing surface friction coefficient in bolted joints based on GA-BP neural network and experimental data [J]. | TRIBOLOGY INTERNATIONAL , 2024 , 201 . |
| MLA | Chen, Wentao et al. "Prediction model for bearing surface friction coefficient in bolted joints based on GA-BP neural network and experimental data" . | TRIBOLOGY INTERNATIONAL 201 (2024) . |
| APA | Chen, Wentao , Li, Ying , Liu, Zhifeng , Zhang, Caixia , Zhao, Yongsheng , Yan, Xing . Prediction model for bearing surface friction coefficient in bolted joints based on GA-BP neural network and experimental data . | TRIBOLOGY INTERNATIONAL , 2024 , 201 . |
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Abstract ：
本发明涉及输电线路自动化维修技术领域，公开了一种强风下输电导线状态偏差测量实验平台及测量方法，包括风机、风力调节机构、支撑机构、位置调节机构和风力检测机构，支撑机构设置有底板，底板上侧设置有半环形突起，底板上表面半环形突起内部固定安装有三角板，三角板为三角形，风力调节机构设置有升降台、安装盒和第一升降组件，风机固定安装在升降台上侧，第一升降组件安装在安装盒内，安装盒滑动安装在底板半环形突起内壁上；位置调节机构设置有固定块，固定块滑动安装在三角板内侧，风力检测机构设置有风杯、电路盒和第二升降组件，本发明实现了能够真实有效模拟强风干扰下的输电导线状态变化。
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| GB/T 7714 | 许静静 , 陶龙 , 刘志峰 et al. 一种强风下输电导线状态偏差测量实验平台及测量方法 : CN202310962750.6[P]. | 2023-08-02 . |
| MLA | 许静静 et al. "一种强风下输电导线状态偏差测量实验平台及测量方法" : CN202310962750.6. | 2023-08-02 . |
| APA | 许静静 , 陶龙 , 刘志峰 , 陈建洲 . 一种强风下输电导线状态偏差测量实验平台及测量方法 : CN202310962750.6. | 2023-08-02 . |
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Abstract ：
本发明公开了一种螺栓预紧力评估方法及其动态参数测量装置，该方法包括：考虑恒定和动态参数，建立基于能量法的螺栓预紧力评估模型；获取栓接结构几何尺寸、测点翘曲位移与材料物理属性参数数据；根据所述测点翘曲位移及其与拧紧螺栓轴线距离确定薄板角位移；基于所述参数数据、角位移和评估模型确定螺栓预紧力。此外，该装置包括测点翘曲位移和螺栓预紧力测量系统。本发明提供的技术方案通过对螺栓预紧力的有效评估，能提高结构可靠性设计水平，为机械装备高性能装配及使役性能提升提供了理论依据，可减低维护成本。
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| GB/T 7714 | 王月珍 , 刘志峰 , 李迎 et al. 一种螺栓预紧力评估方法及其动态参数测量装置 : CN202310045579.2[P]. | 2023-01-30 . |
| MLA | 王月珍 et al. "一种螺栓预紧力评估方法及其动态参数测量装置" : CN202310045579.2. | 2023-01-30 . |
| APA | 王月珍 , 刘志峰 , 李迎 , 赵永胜 , 闫兴 , 陈文涛 . 一种螺栓预紧力评估方法及其动态参数测量装置 : CN202310045579.2. | 2023-01-30 . |
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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 ：
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 ：
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 ：
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 ：
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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