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学者姓名：刘志峰
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Abstract ：
The loosening is one of the main failure modes of bolted joints. Currently, researchers only focused on bolt loosening behavior under simple axial or transverse loads. Understanding the loosening failure mechanism of bolted joints under complex load is important for improving reliability. A multi-directional loading test device was designed, and bolt loosening experiments were conducted. The effect of load direction and amplitude on bolt loosening behavior were investigated. The results indicate that bolt loosening can be divided into two stages. Load direction and load amplitude are critical factors determining the loosening trend in the later stage. In addition, a refined finite element model of bolted joints was established to verify and explain the experimental results. The FEA results show that the relative sliding between internal and external threads and the stress redistribution on the threads are the main reasons for the bolt loosening. The smaller the angle between the load direction and the tangential direction of the contact surface, the relative sliding more likely to occur.
Keyword ：
Mechanical testing Mechanical testing Finite element analysis Finite element analysis Mechanical engineering Mechanical engineering Fasteners Fasteners Steel Steel Bolted joint Bolted joint Loosening failure Loosening failure
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| GB/T 7714 | Yan, Xing , Liu, Zhifeng , Zhao, Yongsheng et al. Experimental and numerical study on the effect of load direction on the bolt loosening failure [J]. | ENGINEERING FAILURE ANALYSIS , 2024 , 163 . |
| MLA | Yan, Xing et al. "Experimental and numerical study on the effect of load direction on the bolt loosening failure" . | ENGINEERING FAILURE ANALYSIS 163 (2024) . |
| APA | Yan, Xing , Liu, Zhifeng , Zhao, Yongsheng , Li, Ying , Chen, Wentao , Li, Ming . Experimental and numerical study on the effect of load direction on the bolt loosening failure . | ENGINEERING FAILURE ANALYSIS , 2024 , 163 . |
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Abstract ：
Mobile manipulators have been widely used in modern industrial fields due to their advantages of large operating workspace and high motion dexterity. For the application, the path planning has been a core foundation for its motion control. However, as the environmental complexity and performance requirements increase, existing methods are limited by low execution efficiency, and lack of comprehensive consideration of motion performances. A motion planning technique is proposed for mobile manipulators with continuous trajectory task. In this technique, a hierarchical constraints dimension reduction (HCDR) strategy is presented based on the task decomposition and performance requirements analysis of each stage. HCDR strategy aims to improve the execution efficiency of the algorithm through local operations of performance constraints and the local simplification of the distance calculation at different stages of the task. Models of inverse kinematics and performance indexes are established to provide basis for constraint conditions, including distance models with different accuracy, manipulability index model and trajectory tracing error model. Two optimization strategies are presented to solve the motion planning problem considering the overall performance of the system. And simulation results show that the three-level strategy has the higher convergence efficiency than the bi-level strategy, as well as can guarantee the motion performance of the system.
Keyword ：
Mobile manipulators Mobile manipulators motion planning motion planning hierarchical constraints dimension reduction (HCDR) hierarchical constraints dimension reduction (HCDR) performance indexes performance indexes continuous trajectory task continuous trajectory task
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| GB/T 7714 | Xu, Jingjing , Tao, Long , Pei, Yanhu et al. HCDR-based motion planning for mobile manipulators with the continuous trajectory task [J]. | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE , 2024 , 238 (12) : 5813-5832 . |
| MLA | Xu, Jingjing et al. "HCDR-based motion planning for mobile manipulators with the continuous trajectory task" . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE 238 . 12 (2024) : 5813-5832 . |
| APA | Xu, Jingjing , Tao, Long , Pei, Yanhu , Liu, Zhifeng , Liu, Tiantian , Chen, Jianzhou . HCDR-based motion planning for mobile manipulators with the continuous trajectory task . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE , 2024 , 238 (12) , 5813-5832 . |
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Abstract ：
Controlling the friction coefficient is crucial for smart friction management and the reduction of energy consumption. The exploration of the mechanisms for regulating friction coefficients is at the core of this issue. In this study, it is proposed that microviscosity plays a pivotal role in influencing the rapid response of the friction coefficient variation in polymer-water-based lubrication systems. The change in microviscosity induced by salt ions was investigated using fluorescent probes and molecular dynamic simulation. The friction contact region was divided into core, corona and blank regions based on functional specificity to investigate microviscosity. The results of the study showed that the microviscosity exhibited by salt ions which are more readily adsorbed in the corona region is the key to determining changes in the friction coefficient. The high microviscosity in the core region of the polymer coating serves as the basis for maintaining a low friction coefficient. The blank region ensures low shear viscosity during friction. Therefore, the regulation of the friction coefficient can be achieved by controlling the microviscosity in the corona region using salt ions. This study not only presents a novel method for characterizing microviscosity but also establishes a theoretical basis for the intelligent regulation of friction.
Keyword ：
Molecular fluorescent probes Molecular fluorescent probes Molecular dynamics simulation Molecular dynamics simulation Friction regulation Friction regulation Superlubricity Superlubricity Microviscosity Microviscosity
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| GB/T 7714 | Zhang, Caixia , Wang, Lihui , Liang, Weihao et al. Fast-response mechanism for regulating friction coefficients induced by microviscosity in polymer-based aqueous lubrication systems [J]. | APPLIED SURFACE SCIENCE , 2024 , 654 . |
| MLA | Zhang, Caixia et al. "Fast-response mechanism for regulating friction coefficients induced by microviscosity in polymer-based aqueous lubrication systems" . | APPLIED SURFACE SCIENCE 654 (2024) . |
| APA | Zhang, Caixia , Wang, Lihui , Liang, Weihao , Li, Ying , Cheng, Yanhong , Liu, Zhifeng et al. Fast-response mechanism for regulating friction coefficients induced by microviscosity in polymer-based aqueous lubrication systems . | APPLIED SURFACE SCIENCE , 2024 , 654 . |
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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 ：
本发明公开了一种基于表面主应变测量内六角螺栓预紧力的试验系统与方法，测试系统由预埋应变片内六角螺栓、缩比试验件、三轴应变花、动态应变仪和上位机组成，三轴应变花对称粘贴在距离内六角螺栓轴线nd位置，测试方法包括：S1、应用动态应变仪和上位机采集螺栓预紧力与测点三个方向的应变；S2、基于测点三向应变数据计算测点主应变ε1和ε2；S3、获取测点主应力σ1和σ2，设计四个测点主应力标准差的阈值；S4、建立表征内六角螺栓预紧力与测点平均应力关系的数据驱动模型。本发明属于数控机床高性能装配技术领域，能够准确测量不同材料和尺寸的内六角螺栓连接结构预紧力，解决了内六角螺栓预紧力在线无损测量方法缺失问题。
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| GB/T 7714 | 李迎 , 李赫 , 刘志峰 et al. 一种基于表面主应变测量内六角螺栓预紧力的试验系统与方法 : CN202310703260.4[P]. | 2023-06-14 . |
| MLA | 李迎 et al. "一种基于表面主应变测量内六角螺栓预紧力的试验系统与方法" : CN202310703260.4. | 2023-06-14 . |
| APA | 李迎 , 李赫 , 刘志峰 , 赵永胜 , 王子龙 , 陈继民 . 一种基于表面主应变测量内六角螺栓预紧力的试验系统与方法 : CN202310703260.4. | 2023-06-14 . |
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Abstract ：
本发明公开了一种内反馈式静压转台节流器设计方法，计算扇形油垫的流量。采用有限差分法对二阶偏微分方程进行离散，采用高斯赛德尔迭代法对上式进行求解，得到油腔的无量纲压强，得不同方向的速度三维分布；矩形缝隙流量计算。由于矩形缝隙节流器的短边尺寸非常小，将矩形缝隙节流器看成是矩形油垫，其只有长边封油边起作用。转台旋转后，流经矩形缝隙的油液带有离心力。在求解矩形缝隙节流器的流量时，将矩形油垫等效成扇形油垫，其中心和扇形油垫中心重合，等效前后面积不变。在初始状态下，上下油腔油膜厚度相同，根据内反馈结构特点，经过下油腔的流量和过节流边的流量相等。本发明关于节流器长度计算方法更符合实际。
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| GB/T 7714 | 杨聪彬 , 马弘列 , 张涛 et al. 一种内反馈式静压转台节流器设计方法 : CN202310230978.6[P]. | 2023-03-12 . |
| MLA | 杨聪彬 et al. "一种内反馈式静压转台节流器设计方法" : CN202310230978.6. | 2023-03-12 . |
| APA | 杨聪彬 , 马弘列 , 张涛 , 刘志峰 , 程强 . 一种内反馈式静压转台节流器设计方法 : CN202310230978.6. | 2023-03-12 . |
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Abstract ：
本发明公开了一种基于PM流量控制器的内反馈静压油膜厚度控制方法，构成该方法的装置包括：第一油箱、第二油箱、粗滤油器、油泵、伺服电机、精滤油器、单向阀、先导型电磁溢流阀、PM流量控制器、导轨、第一节流器、第二节流器、上静压油垫、径向静压油垫、下静压油垫和静压工作台；利用PM流量控制器的优势，实现当负载增大时，油腔压力随之增大，流量通过控制也增大；反之，当负载减小时，油腔压力随之减小，流量也减小。PM流量控制器对流量的调节仅仅是依靠压差来使金属薄膜产生相应的变形来进行控制，不需要外部能量输入或电子控制，能够保证油膜在静压系统工作情况下能够长时间保持恒定，且工作稳定可靠，确保静压转台高效稳定长时间运行。
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| GB/T 7714 | 刘志峰 , 苏哲 , 杨聪彬 et al. 一种基于PM流量控制器的内反馈静压油膜厚度控制方法 : CN202310230977.1[P]. | 2023-03-12 . |
| MLA | 刘志峰 et al. "一种基于PM流量控制器的内反馈静压油膜厚度控制方法" : CN202310230977.1. | 2023-03-12 . |
| APA | 刘志峰 , 苏哲 , 杨聪彬 , 程艳红 , 张涛 . 一种基于PM流量控制器的内反馈静压油膜厚度控制方法 : CN202310230977.1. | 2023-03-12 . |
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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 ：
本发明公开了一种内反馈式静压转台偏载性能计算方法，包括步骤一：计算倾斜后各油腔油膜厚度。步骤二：根据流体润滑理论，计算上下油腔压强及支承力矩。步骤三：计算偏载下转台角度；定义油垫结构参数，选取油液属性参数：本发明具有的优点和积极效果是：本发明充分考虑了实际负载的影响，通过多层次迭代进行偏转角度的求解，而非直接给定偏转角，更符合实际转台运行工况。
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| GB/T 7714 | 杨聪彬 , 马弘列 , 程强 et al. 一种内反馈式静压转台偏载性能计算方法 : CN202310702345.0[P]. | 2023-06-14 . |
| MLA | 杨聪彬 et al. "一种内反馈式静压转台偏载性能计算方法" : CN202310702345.0. | 2023-06-14 . |
| APA | 杨聪彬 , 马弘列 , 程强 , 李迎 , 刘志峰 . 一种内反馈式静压转台偏载性能计算方法 : CN202310702345.0. | 2023-06-14 . |
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Abstract ：
本发明公开了一种内反馈式静压转台扇形单油垫实验装置，包括静压支撑系统，静压支撑系统由供油系统供油。静压支撑系统的上油垫、下油垫通过螺栓固定在支撑导轨上，支撑导轨设于U形支撑板内，上油垫、下油垫分别正对U形支撑板的上下内壁，U形支撑板与上油垫之间，U形支撑板与下油垫之间分别形成油膜厚度；内反馈的油路通过内孔隐藏在支撑导轨内部；支撑导轨由支撑杆支撑连接，U形支撑板的外部设有磁性水平尺；U形支撑板的底部设有压力传感器；压力传感器的底部设有竖向安装丝杠，由丝杠调节U形支撑板的高度；三个手轮与丝杠相连，通过转动手轮来调节丝杠高度；本发明可以检测单油垫的承载性能，不需要搭建整个静压转台，降低了成本。
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| GB/T 7714 | 赵永胜 , 罗嘉庆 , 杨聪彬 et al. 一种内反馈式静压转台扇形单油垫实验装置 : CN202310230975.2[P]. | 2023-03-12 . |
| MLA | 赵永胜 et al. "一种内反馈式静压转台扇形单油垫实验装置" : CN202310230975.2. | 2023-03-12 . |
| APA | 赵永胜 , 罗嘉庆 , 杨聪彬 , 李迎 , 刘志峰 . 一种内反馈式静压转台扇形单油垫实验装置 : CN202310230975.2. | 2023-03-12 . |
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