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摘要 ：
An adaptive control strategy is developed for active degradation compensation of fuel cells, so as to improve output performance stability during long-time operation. Two groups of long-time tests of DMFC under different operating parameters are designed and implemented. The parameter adjustment significance that defines the adjusting priority is obtained from experimental analyses, based on which, the adaptive control strategy is developed and systematically tested. The results show that temporary degradation and permanent degradation for fuel cell performance could be differentiated in the process of performance degradation and recovery. The operation condition which would bring a higher energy conversion efficiency may lead to more serious degradations. The developed control strategy could help to adaptively alleviate fuel cell degradation during long-time operation. The temporary degradation and permanent degradation rates both decreased in daily operation, and the errors between output voltage and objective values are controlled within 2 %. The study provides an effective reference for improving the fuel cell stability during long-time operation and prolonging its service life. (c) 2021 Published by Elsevier Ltd.
关键词 ：
Adaptive control strategy Adaptive control strategy Degradation compensation Degradation compensation Energy conversion efficiency Energy conversion efficiency Parameter adjustment Parameter adjustment Stability Stability
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| GB/T 7714 | Yang, Qinwen , Gao, Bin , Cheng, Qiang et al. Adaptive control strategy for power output stability in long-time operation of fuel cells [J]. | ENERGY , 2022 , 238 . |
| MLA | Yang, Qinwen et al. "Adaptive control strategy for power output stability in long-time operation of fuel cells" . | ENERGY 238 (2022) . |
| APA | Yang, Qinwen , Gao, Bin , Cheng, Qiang , Xiao, Gang , Meng, Min . Adaptive control strategy for power output stability in long-time operation of fuel cells . | ENERGY , 2022 , 238 . |
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摘要 ：
机械制造训练是培养机械工程专业人才解决复杂工程问题能力的综合性实践训练环节.文章探讨在机械制造训练环节通过线上学习与线下实训相混合、虚拟仿真与实践加工相混合的双层混合式教学,并进行多阶段考核与多角度评价,实现对学生综合实践能力的培养并有利于这个教学环节的持续改进.
关键词 ：
混合式教学 混合式教学 机械制造训练 机械制造训练 虚拟仿真 虚拟仿真 考核评价方式 考核评价方式
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| GB/T 7714 | 初红艳 , 程强 , 刘志峰 et al. 机械制造训练线上线下混合式教学实践探索 [J]. | 大学教育 , 2021 , (4) : 89-92 . |
| MLA | 初红艳 et al. "机械制造训练线上线下混合式教学实践探索" . | 大学教育 4 (2021) : 89-92 . |
| APA | 初红艳 , 程强 , 刘志峰 , 赵永胜 , 杨聪彬 . 机械制造训练线上线下混合式教学实践探索 . | 大学教育 , 2021 , (4) , 89-92 . |
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摘要 ：
基于工程教育专业认证"产出导向"基本理念,以我校两次机械工程专业认证为契机,对机械工程专业实践教学体系进行了"6"模块重构,提出了以减速器为对象的机械工程专业"1+5+1"纵贯式实践教学模式.以培养学生实践动手能力和创新意识为目标,在夯实学生以绘图为"1"基本功的基础上,以减速器为对象纵贯式培养学生机电产品设计、制造、装配、检测、分析等"5"大核心技能,以及以团队管理与协作能力为"1"综合素质,培养学生解决复杂工程问题的能力及工程师素养.
引用：
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| GB/T 7714 | 程强 , 初红艳 , 杨聪彬 et al. 以减速器为对象的机械工程专业纵贯式实践教学改革 [J]. | 中国现代教育装备 , 2021 , (19) : 89-91,100 . |
| MLA | 程强 et al. "以减速器为对象的机械工程专业纵贯式实践教学改革" . | 中国现代教育装备 19 (2021) : 89-91,100 . |
| APA | 程强 , 初红艳 , 杨聪彬 , 刘志峰 , 张彩霞 . 以减速器为对象的机械工程专业纵贯式实践教学改革 . | 中国现代教育装备 , 2021 , (19) , 89-91,100 . |
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摘要 ：
At present, wear models and accuracy prediction of guideway are established based on elastoplastic mechanics of continuous media. These methods are limited to describe the process of accuracy degradation by using the material performance defined based on macroscopic hypothesis condition. In this paper, the multiscale method based on quasicontinuum medium(QM) principle is proposed to describe the degradation process of guideway linear precision with an exponential model. According to the wear distribution of the guideway surface with the micro-morphology evolution process, the measurement value of the guideway linear precision is modeled systematically. Then, using the quasicontinuum medium method instead of the continuum hypothesis, the exponential wear model of guideway is established. The exponential wear model uses the wear exponent to describe the wear status based on linear precision measurement rather than tremendous wear volume tests. By means of Depth From Defocus (DFD) method, the micro-topography information of the guideway surface is obtained. Therefore, the wear state of the guideway is verified under different loading conditions, and the validity of using the QM method to establish the guideway exponential wear model is verified.
关键词 ：
exponential wear model exponential wear model Guideway Guideway precision retention precision retention quasicontinuum medium method quasicontinuum medium method wear wear
引用：
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| GB/T 7714 | Cheng, Qiang , Qi, Baobao , Ren, Weida et al. A new exponential wear model to analyze precision retention of guideway based on macro-micro multiscale method [J]. | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY , 2021 , 235 (8) : 1499-1513 . |
| MLA | Cheng, Qiang et al. "A new exponential wear model to analyze precision retention of guideway based on macro-micro multiscale method" . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY 235 . 8 (2021) : 1499-1513 . |
| APA | Cheng, Qiang , Qi, Baobao , Ren, Weida , Liu, Zhifeng . A new exponential wear model to analyze precision retention of guideway based on macro-micro multiscale method . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY , 2021 , 235 (8) , 1499-1513 . |
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摘要 ：
盘形锻件等效应力分析及神经网络预测
关键词 ：
等效应力 等效应力 灰关联分析 灰关联分析 主成分分析法 主成分分析法 质量控制 质量控制 钛合金锻件 钛合金锻件 BP神经网络 BP神经网络
引用：
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| GB/T 7714 | 初红艳 , 赵凯林 , 程强 et al. 盘形锻件等效应力分析及神经网络预测 [J]. | 初红艳 , 2021 , 47 (2) : 103-111 . |
| MLA | 初红艳 et al. "盘形锻件等效应力分析及神经网络预测" . | 初红艳 47 . 2 (2021) : 103-111 . |
| APA | 初红艳 , 赵凯林 , 程强 , 北京工业大学学报 . 盘形锻件等效应力分析及神经网络预测 . | 初红艳 , 2021 , 47 (2) , 103-111 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
锻件等效应力对锻件质量有较大的影响,而实现其在锻造生产中的在线测量并进行综合评价较为困难.利用弹塑性有限元法对钛合金盘形锻件进行有限元仿真分析并进行了实验验证,分析了加载完成后等效应力的分布情况;利用灰关联分析方法对结果进行分析,结果表明坯料初始温度对锻件等效应力影响程度最大,室温影响最小.基于等效应力分布情况,利用主成分分析法建立应力综合评价模型,以坯料温度、模具温度、下压速度、室温、摩擦因数为输入层,应力综合评价值为输出层,建立了预测综合等效应力的反向传播(back propagation,BP)人工神经网络模型.结果表明BP神经网络的预测结果与实验所得结果较为一致,证明了建立的人工神经网...
关键词 ：
BP神经网络 BP神经网络 主成分分析法 主成分分析法 灰关联分析 灰关联分析 等效应力 等效应力 质量控制 质量控制 钛合金锻件 钛合金锻件
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | 初红艳 , 赵凯林 , 程强 . 盘形锻件等效应力分析及神经网络预测 [J]. | 北京工业大学学报 , 2021 , 47 (02) : 103-111 . |
| MLA | 初红艳 et al. "盘形锻件等效应力分析及神经网络预测" . | 北京工业大学学报 47 . 02 (2021) : 103-111 . |
| APA | 初红艳 , 赵凯林 , 程强 . 盘形锻件等效应力分析及神经网络预测 . | 北京工业大学学报 , 2021 , 47 (02) , 103-111 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
机械制造训练线上线下混合式教学实践探索
关键词 ：
机械制造训练 机械制造训练 混合式教学 混合式教学 考核评价方式 考核评价方式 虚拟仿真 虚拟仿真
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | 初红艳 , 程强 , 刘志峰 et al. 机械制造训练线上线下混合式教学实践探索 [J]. | 初红艳 , 2021 , (4) : 89-92 . |
| MLA | 初红艳 et al. "机械制造训练线上线下混合式教学实践探索" . | 初红艳 4 (2021) : 89-92 . |
| APA | 初红艳 , 程强 , 刘志峰 , 赵永胜 , 杨聪彬 , 大学教育 . 机械制造训练线上线下混合式教学实践探索 . | 初红艳 , 2021 , (4) , 89-92 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Bolted joints are widely used in mechanical construction due to their ease of disassembly. When the bolting member is subjected to the alternating load, the pretightening force is gradually reduced, which may cause the interface contact performance to decrease, and the surface may be microslipped. Preload relaxation of threaded fasteners is the main factor that influences the joint failure under normal cyclic loading, but it is difficult to monitor the energy dissipation between the interface of the bolted joint. This paper presents an energy dissipation model for the bolted joint based on two-degree-of-freedom vibration differential mathematical model. The parameters of the model is calculated by using the fractal theory and differential operator method. The efficiency of the proposed model is verified by experiments. The results show that the experimental modal shape agrees well with the theoretical modal shape. According to the change of cyclic load and vibration frequency, the vibration response and the law of energy dissipation under different factors can be obtained. The results show that the vibration frequency and cyclic load are the main factors affecting the energy dissipation between interfaces. The energy dissipation of the contact surface of the bolted joints account for the main part of the energy dissipation of the bolted structure. The results provide a theoretical basis for reducing the looseness of the bolt connection and ensuring the reliability of the equipment. © 2021 American Society of Mechanical Engineers (ASME). All rights reserved.
关键词 ：
Bolted joints Bolted joints Bolts Bolts Cyclic loads Cyclic loads Degrees of freedom (mechanics) Degrees of freedom (mechanics) Energy dissipation Energy dissipation Mathematical operators Mathematical operators
引用：
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| GB/T 7714 | Cheng, Qiang , Xu, Wenxiang , Liu, Zhifeng et al. The effects of energy dissipation of the closure bolted joints under vibration behavior [J]. | Journal of Pressure Vessel Technology, Transactions of the ASME , 2021 , 143 (2) . |
| MLA | Cheng, Qiang et al. "The effects of energy dissipation of the closure bolted joints under vibration behavior" . | Journal of Pressure Vessel Technology, Transactions of the ASME 143 . 2 (2021) . |
| APA | Cheng, Qiang , Xu, Wenxiang , Liu, Zhifeng , Yang, Congbin , Li, Ying . The effects of energy dissipation of the closure bolted joints under vibration behavior . | Journal of Pressure Vessel Technology, Transactions of the ASME , 2021 , 143 (2) . |
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摘要 ：
In the actual production, it is expected to find several sensitivity geometric errors which have great influence on machining accuracy, so as to provide references for the manufacturing, assembly, and other links of the machine tool, and fundamentally improve the working performance. To study this problem, a novel global sensitivity analysis (GSA) method is proposed. Based on the MBS theory, the spatial error model is established to analyze the local influence of geometric error on machining accuracy. An improved second-order partial correlation coefficient based on the Pearson product moment is proposed to analyze the correlation between geometric errors. In addition, the error parameters will change greatly in the stroke of the moving parts. However, the rapid fluctuation of geometric error value will have a dynamic impact on the machining accuracy of machine tools, which is rarely noticed in the previous sensitivity analysis. This change is defined as the fluctuation of error. The high fitting degree function of error-displacement is obtained by using the high order Fourier series and sine series. Then, the fluctuation of the error in the machining stroke is analyzed by using the derivative of the function to the displacement. Through geometric error characteristics (including the local influence, correlation, and fluctuation) are studied comprehensively, the GSA of error is carried out. Finally, taking a machining center as an example and combining the sensitivity analysis results, the improvement measures are proposed to verify the correctness of the method. © 2021, The Author(s), under exclusive licence to Springer-Verlag London Ltd. part of Springer Nature.
关键词 ：
Errors Errors Fourier series Fourier series Geometry Geometry Machining Machining Machining centers Machining centers Manufacture Manufacture Sensitivity analysis Sensitivity analysis
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| GB/T 7714 | Niu, Peng , Cheng, Qiang , Liu, Zhifeng et al. A machining accuracy improvement approach for a horizontal machining center based on analysis of geometric error characteristics [J]. | International Journal of Advanced Manufacturing Technology , 2021 , 112 (9-10) : 2873-2887 . |
| MLA | Niu, Peng et al. "A machining accuracy improvement approach for a horizontal machining center based on analysis of geometric error characteristics" . | International Journal of Advanced Manufacturing Technology 112 . 9-10 (2021) : 2873-2887 . |
| APA | Niu, Peng , Cheng, Qiang , Liu, Zhifeng , Chu, Hongyan . A machining accuracy improvement approach for a horizontal machining center based on analysis of geometric error characteristics . | International Journal of Advanced Manufacturing Technology , 2021 , 112 (9-10) , 2873-2887 . |
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摘要 ：
Ball screw mechanisms (BSMs) are used as accuracy transmission components in a wide range of industries and are characterized by their high accuracy. More specifically, the positioning accuracy of BSM has a significant effect on the accuracy of machine tool. Based on the macro-micro multiscale method, an exponential prediction model for the BSM positioning accuracy was developed considering time-varying working conditions (load and rotational speed) and feed modes. Since the accuracy degradation is mainly caused by wear, a microscopic approach was proposed to describe the positioning accuracy retention and the microscopic wear process was investigated. The sliding contact of the asperities between the ball and raceway was analyzed, and the microscopic wear behavior of the asperities was determined. Considering the time-varying working conditions, the BSM positioning accuracy characteristics were obtained under the normal feed mode by conducting suitable tests. The exponential wear model used the wear index to describe the wear status based on the positioning accuracy measurement. The accuracy loss value and the prediction index of positioning accuracy were determined based on an exponential model, and the effective lifetime of the BSM was predicted. Finally, the exponential prediction model was used in negative/positive skew feed distribution, and the effective lifetime determined. © IMechE 2020.
关键词 ：
Ball screws Ball screws Forecasting Forecasting Machine tools Machine tools Predictive analytics Predictive analytics Wear of materials Wear of materials
引用：
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| GB/T 7714 | Cheng, Qiang , Qi, Baobao , Liu, Zhifeng et al. Positioning accuracy degradation and lifetime prediction of the ball screw considering time-varying working conditions and feed modes [J]. | Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture , 2021 , 235 (6-7) : 943-957 . |
| MLA | Cheng, Qiang et al. "Positioning accuracy degradation and lifetime prediction of the ball screw considering time-varying working conditions and feed modes" . | Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 235 . 6-7 (2021) : 943-957 . |
| APA | Cheng, Qiang , Qi, Baobao , Liu, Zhifeng , Yang, Congbin , Zheng, Jigui . Positioning accuracy degradation and lifetime prediction of the ball screw considering time-varying working conditions and feed modes . | Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture , 2021 , 235 (6-7) , 943-957 . |
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