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学者姓名：陈树君
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Abstract ：
Robotic friction stir welding (RFSW), with its wide application range, ample working space, and task flexibility, has emerged as a vital development in friction stir welding (FSW) technology. However, the low stiffness of serial industrial robots can lead to end-effector deviations and vibrations during FSW tasks, adversely affecting the weld quality. This paper proposes a dynamic dual particle swarm optimization (DDPSO) algorithm through a new comprehensive stability index that considers both the stiffness and vibration stability of the robot to optimize the installation position of complex space curve weldments, thereby enhancing the robot's stability during the FSW process. The algorithm employs two independent particle swarms for exploration and exploitation tasks and dynamically adjusts task allocation and particle numbers based on current results to fully utilize computational resources and enhance search efficiency. Compared to the standard particle swarm optimization (PSO) algorithm, the DDPSO approach demonstrated superior search capabilities and stability of optimization results. The maximum fitness value improved by 4.2%, the average value increased by 12.74%, and the concentration level of optimization results rose by 72.91% on average. The new optimization method pioneers fresh perspectives for optimizing the stability of RFSW, providing significant grounds for the process optimization and offline programming of complex spatial curve weldments.
Keyword ：
friction stir welding friction stir welding vibration stability vibration stability Cartesian stiffness ellipsoid Cartesian stiffness ellipsoid robot stability index robot stability index robot stiffness robot stiffness
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| GB/T 7714 | Zong, Guanchen , Kang, Cunfeng , Chen, Shujun et al. Optimization of Installation Position for Complex Space Curve Weldments in Robotic Friction Stir Welding Based on Dynamic Dual Particle Swarm Optimization [J]. | PROCESSES , 2024 , 12 (3) . |
| MLA | Zong, Guanchen et al. "Optimization of Installation Position for Complex Space Curve Weldments in Robotic Friction Stir Welding Based on Dynamic Dual Particle Swarm Optimization" . | PROCESSES 12 . 3 (2024) . |
| APA | Zong, Guanchen , Kang, Cunfeng , Chen, Shujun , Jiang, Xiaoqing . Optimization of Installation Position for Complex Space Curve Weldments in Robotic Friction Stir Welding Based on Dynamic Dual Particle Swarm Optimization . | PROCESSES , 2024 , 12 (3) . |
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Abstract ：
Al-Cu alloys show great potential for aerospace applications because of their remarkable advantages, and wire arc additive manufacturing (WAAM) provides a way to print large-scale metal structures. However, the high crack susceptibility is a limiting factor for WAAM of Al-Cu alloy parts. In this study, the primary mechanism of crack formation, including the grain structure, Cu segregation, and eutectic structure transition, of an as -deposited WAAM Al-Cu alloy were investigated. The results showed that macrocracks with lengths of approxi-mately 6-9 cm and depths of 5.6-7 mm occurred in the bottom of the part. The cracks in the WAAM part of the Al-Cu alloy were dominated by liquation cracks, which preferentially formed at high-angle grain boundaries (GBs) with GB angles in the range 30 degrees -60 degrees. Moreover, the discontinuous normal eutectics transform to continuous-strip divorced eutectics in the GBs. This is clear evidence for the temperature of the GB liquid in the partially melting zone exceeding the eutectic temperature (548 degrees C) during the subsequent re-heating process. An almost constant amount of solute segregation was calculated by Scheil solidification models. The microstructure showed the fine to coarse grain transformation in a deposited layer, resulting in lower GB density toward the inner-layer zone. Thus, the conditions that are needed for liquation cracking are low GB density to generate a wide eutectic liquid film and high intergranular strain in the partially melting zone. This means to liquation cracking is more prefer to nucleated in comparison with solidification cracking.
Keyword ：
Al-Cu alloy Al-Cu alloy Microstructure Microstructure Liquation cracking Liquation cracking Wire arc additive manufacturing Wire arc additive manufacturing
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| GB/T 7714 | Xu, Min , Zhang, Hongda , Yuan, Tao et al. Microstructural characteristics and cracking mechanism of Al-Cu alloys in wire arc additive manufacturing [J]. | MATERIALS CHARACTERIZATION , 2023 , 197 . |
| MLA | Xu, Min et al. "Microstructural characteristics and cracking mechanism of Al-Cu alloys in wire arc additive manufacturing" . | MATERIALS CHARACTERIZATION 197 (2023) . |
| APA | Xu, Min , Zhang, Hongda , Yuan, Tao , Yan, Zhaoyang , Chen, Shujun . Microstructural characteristics and cracking mechanism of Al-Cu alloys in wire arc additive manufacturing . | MATERIALS CHARACTERIZATION , 2023 , 197 . |
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Abstract ：
钛合金带筋壁板类T形结构常见于航空制造领域，其激光焊接工艺已经比较成熟.但是即便在激光高速焊接过程热输入已经很低，仍然会存在一定的焊后角变形.由于航空制造的高精度要求，需要施加额外的主动控制以最大限度减小此类角变形.文中提出并验证了基于可编程多点柔性支撑的主动变形控制方法.针对传统刚性装夹、预置应力不适应于弱刚性带筋壁板结构的问题，设计了一套以STM32单片机为主控，直线电动推杆为执行机构的多点柔性支撑装置.结果表明，可在焊接过程实时监测当前支撑位置的受力状态，并进行动态调节，从而达到有效抑制焊接角变形的效果.
Keyword ：
多点柔性支撑 多点柔性支撑 变形控制 变形控制 T形接头 T形接头 激光焊接 激光焊接
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| GB/T 7714 | 肖珺 , 雷一鼎 , 陈树君 et al. 基于多点柔性支撑的钛合金激光焊接变形控制 [J]. | 焊接学报 , 2022 , 43 (08) : 8-12,113 . |
| MLA | 肖珺 et al. "基于多点柔性支撑的钛合金激光焊接变形控制" . | 焊接学报 43 . 08 (2022) : 8-12,113 . |
| APA | 肖珺 , 雷一鼎 , 陈树君 , 芦苇 , 何恩光 . 基于多点柔性支撑的钛合金激光焊接变形控制 . | 焊接学报 , 2022 , 43 (08) , 8-12,113 . |
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Abstract ：
铝-镁复合结构可以利用两者的优良性能，在装甲外壳、飞机机身等工件中有较大的应用潜力。搅拌摩擦焊（FSW）能有效地避免气孔、夹渣等缺陷，对于异种焊接有较大的优势。但在铝镁异种合金搅拌摩擦焊过程中，焊接接头容易产生硬脆的铝镁金属间化合物，严重恶化焊接接头的力学性能。研究了工艺参数对3 mm厚5A06铝合金和AZ31B镁合金FSW接头焊缝成形的影响，得到成形良好的焊缝焊接工艺参数区间。观察焊缝横截面，分为5个区域，分别是Mg侧的热影响区、Mg侧的热机影响区、搅拌区、Al侧的热影响区、Al侧的热机影响区。并利用SEM和XRD分析发现，铝镁异种合金FSW金属间化合物主要为Al_3Mg_2和Al_(12)...
Keyword ：
金属间化合物 金属间化合物 异种合金 异种合金 搅拌摩擦焊 搅拌摩擦焊
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| GB/T 7714 | 孔德兵 , 陈树君 , 蒋晓青 . 铝镁异种合金FSW接头形貌及金属间化合物研究 [J]. | 热加工工艺 , 2022 , 51 (11) : 12-16 . |
| MLA | 孔德兵 et al. "铝镁异种合金FSW接头形貌及金属间化合物研究" . | 热加工工艺 51 . 11 (2022) : 12-16 . |
| APA | 孔德兵 , 陈树君 , 蒋晓青 . 铝镁异种合金FSW接头形貌及金属间化合物研究 . | 热加工工艺 , 2022 , 51 (11) , 12-16 . |
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Abstract ：
实践教学在工科专业的教学体系中占有重要地位，对于培养学生的创新精神与工程能力起到了不可替代的作用。然而，现有实践教学体系存在内容多呈碎片化、实践过程程式化、缺乏与应用高度融合、未能高效利用新技术等问题，从而难以满足社会需求。为此，以智能制造工程专业为例，结合制造岛概念，在校区范围内建立覆盖产品生产全流程的工业化、智能化、网络化、模块化智能学习工厂，并基于此建立实践教学体系，在实践环节构建、实践内容设置、实践手段运用、辅助措施建设等方面开展创新研究，使其具有前沿需求引导、工业特点突出、完整流程覆盖、内容主线明确、实践手段丰富的特点，以满足“新工科”形势下的人才培养需求。
Keyword ：
智能制造 智能制造 建设内涵 建设内涵 实践教学体系 实践教学体系 智能学习工厂 智能学习工厂
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| GB/T 7714 | 张自强 , 陈树君 . 基于智能学习工厂的实践教学体系探究——以智能制造工程专业为例 [J]. | 高等工程教育研究 , 2022 , PageCount-页数: 6 (02) : 87-92 . |
| MLA | 张自强 et al. "基于智能学习工厂的实践教学体系探究——以智能制造工程专业为例" . | 高等工程教育研究 PageCount-页数: 6 . 02 (2022) : 87-92 . |
| APA | 张自强 , 陈树君 . 基于智能学习工厂的实践教学体系探究——以智能制造工程专业为例 . | 高等工程教育研究 , 2022 , PageCount-页数: 6 (02) , 87-92 . |
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Abstract ：
隔离式双向有源全桥(DAB) DC-DC变换器具有电气隔离、高功率密度、宽电压传输范围和易于实现软开关等优点，被广泛应用于现代电力系统、能量转换和存储应用等领域。目前DAB的主电路仿真研究所采用的都是理想器件或是在算法层面进行仿真。针对此问题，建立了基于实际参数的器件模型和基于PSpice的实际电路拓扑模型，并建立了数学模型，对比分析了不同控制策略下DAB变换器的电流及回流功率特性。仿真结果与理论计算值相同，验证了所建仿真模型及仿真方法的准确性，为DAB研究提供了参考。
Keyword ：
电流 电流 PSpice仿真 PSpice仿真 双有源桥 双有源桥 控制策略 控制策略 回流功率 回流功率
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| GB/T 7714 | 陈树君 , 易榕仙 , 张景璋 et al. 隔离式双向有源全桥控制策略分析及仿真研究 [J]. | 电源技术 , 2022 , 46 (06) : 693-696 . |
| MLA | 陈树君 et al. "隔离式双向有源全桥控制策略分析及仿真研究" . | 电源技术 46 . 06 (2022) : 693-696 . |
| APA | 陈树君 , 易榕仙 , 张景璋 , 余悦 . 隔离式双向有源全桥控制策略分析及仿真研究 . | 电源技术 , 2022 , 46 (06) , 693-696 . |
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Abstract ：
The effect of stationary shoulder friction stir welding (SSFSW) on temperature gradient and material flow was investigated to optimize the SSFSW process. A three-dimensional numerical model of heat generation and material flow was established by using computational fluid dynamics, and thermo-physical phenomena of SSFSWed Ti-6Al-4V were quantitatively analyzed in terms of heat generation, heat transfer, material flow and viscosity. The temperature gradient was more uniform in a narrow stir zone produced by the SSFSW process. The distribution of velocity was studied, and instantaneous velocity center of tool was divided into two different velocity regions to study the material flow. The simulation results were verified by experimental thermal cycles of calculated position of model, which was in accordance with the experimental results.
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| GB/T 7714 | Jiang Xiaoqing , Jiang Wang , Yuan Tao et al. Numerical simulation of the stationary shoulder friction stir welding of Ti-6Al-4V [J]. | JOURNAL OF MATERIALS SCIENCE , 2022 , 57 (14) : 7367-7383 . |
| MLA | Jiang Xiaoqing et al. "Numerical simulation of the stationary shoulder friction stir welding of Ti-6Al-4V" . | JOURNAL OF MATERIALS SCIENCE 57 . 14 (2022) : 7367-7383 . |
| APA | Jiang Xiaoqing , Jiang Wang , Yuan Tao , Chen Shujun , Wang Lei , Liu Yongyong . Numerical simulation of the stationary shoulder friction stir welding of Ti-6Al-4V . | JOURNAL OF MATERIALS SCIENCE , 2022 , 57 (14) , 7367-7383 . |
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Abstract ：
Mg alloys have been extensively used in lightweight manufacturing owing to excellent mechanical properties. However, liquation cracking occurred during welding of dissimilar Mg alloys, significantly deteriorating mechanical properties. The temperature-stress distribution and generation law of liquation cracking in circularpatch welding of dissimilar Mg alloys were investigated by a combination of numerical simulation and experimental work. The peak temperature in the partially melted zone 0-2.5 mm from the outside of the weld exceeded 710 K (eutectic temperature of AZ91), which is prone to eutectic liquation. The radial tensile stress exerted on the partially melted zone during the cooling process. The peak value of radial tensile stress in the last stage of solidification of eutectic liquid phase reached about 24.4 MPa. Heat treatment before welding was used to dissolve the intermetallic compounds gamma(Mg17Al12) to prevent liquation cracking.
Keyword ：
Numerical simulation Numerical simulation Pre-heat treatment Pre-heat treatment Intermetallic compounds Intermetallic compounds Liquation cracking Liquation cracking Dissimilar Mg welds Dissimilar Mg welds
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| GB/T 7714 | Yuan, Tao , Zhang, Hongda , Jiang, Xiaoqing et al. Investigation on liquation cracks of dissimilar magnesium alloy welds using the circular-patch experiment and numerical simulation [J]. | JOURNAL OF MANUFACTURING PROCESSES , 2022 , 75 : 49-59 . |
| MLA | Yuan, Tao et al. "Investigation on liquation cracks of dissimilar magnesium alloy welds using the circular-patch experiment and numerical simulation" . | JOURNAL OF MANUFACTURING PROCESSES 75 (2022) : 49-59 . |
| APA | Yuan, Tao , Zhang, Hongda , Jiang, Xiaoqing , Chen, Shujun , Xu, Min , Liu, Xusheng . Investigation on liquation cracks of dissimilar magnesium alloy welds using the circular-patch experiment and numerical simulation . | JOURNAL OF MANUFACTURING PROCESSES , 2022 , 75 , 49-59 . |
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Abstract ：
The WAAM (Wire Arc Additive Manufacturing) process is well-respected because of its low cost and high deposition efficiency; nevertheless, the process has the limitations of high heat input and low forming accuracy. Hybrid manufacturing processes employing both additive and subtractive processes can effectively reduce shape error. The predictive modeling of surface roughness in thermally assisted machining is described in this paper on the basis of three important parameters: feed per tooth, spindle speed, and workpiece temperature. The predictive model indicates that temperature has a very significant influence on the surface quality. An experimental study on thermally assisted machining was performed to obtain the variation law of cutting surface quality with temperature in order to determine the optimal process interval of subtractive processes. Through finite element simulation of thermally assisted machining, the influence law of external main cutting force and the internal mean stress of the cutting material were determined.
Keyword ：
WAAM WAAM surface roughness predictive surface roughness predictive response surface methodology response surface methodology FE simulation FE simulation thermally assisted milling thermally assisted milling
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| GB/T 7714 | Tian, Hongyu , Lu, Zhenyang , Chen, Shujun . Predictive Modeling of Thermally Assisted Machining and Simulation Based on RSM after WAAM [J]. | METALS , 2022 , 12 (4) . |
| MLA | Tian, Hongyu et al. "Predictive Modeling of Thermally Assisted Machining and Simulation Based on RSM after WAAM" . | METALS 12 . 4 (2022) . |
| APA | Tian, Hongyu , Lu, Zhenyang , Chen, Shujun . Predictive Modeling of Thermally Assisted Machining and Simulation Based on RSM after WAAM . | METALS , 2022 , 12 (4) . |
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Abstract ：
智能制造是新一轮工业革命的核心动力。北京工业大学面向北京“四个中心”建设及京津冀协同发展目标，积极开展智能制造工程专业建设探索。以典型产品为核心、以虚实结合为手段创新课程体系，并鼓励任课教师在科研上形成贯通机制，从而打破知识壁垒，实现课程体系与科研方向的主线化与集群化。最终在教学体系、师资队伍及专业平台等方面形成优势特色，培养面向“基于现代设计方法的产品智能设计、基于现代网络环境的分布式协同制造”的高素质应用型创新型人才，为推动京津冀先进制造产业转型升级作出贡献。
Keyword ：
科研优势 科研优势 课程体系 课程体系 专业建设 专业建设 智能制造工程 智能制造工程
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| GB/T 7714 | 陈树君 , 张自强 . 打破知识壁垒——智能制造工程专业建设探索 [J]. | 高教学刊 , 2022 , 8 (22) : 7-10 . |
| MLA | 陈树君 et al. "打破知识壁垒——智能制造工程专业建设探索" . | 高教学刊 8 . 22 (2022) : 7-10 . |
| APA | 陈树君 , 张自强 . 打破知识壁垒——智能制造工程专业建设探索 . | 高教学刊 , 2022 , 8 (22) , 7-10 . |
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