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学者姓名：赵永胜
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摘要 ：
为提高加工过程中刀具磨损状态的识别精度,结合改进的变分模态分解算法(modified variational mode decomposition,MVMD)、自适应回溯搜索算法(adaptive backtracking search algorithm,ABSA)及最小二乘支持向量机(least squares-support vector machine,LS-SVM),提出一种刀具磨损快速识别模型.针对传统信号处理方法存在的模态混叠、噪声敏感等问题,采用瞬时频率均值法预先确定最佳分解模态数,引入降噪型变分模态分解算法进行信号分解;为提高优化效率与自适应性,提出一种改进的自适应回溯搜索算...
关键词 ：
振动信号 振动信号 回溯搜索算法 回溯搜索算法 最小二乘支持向量机 最小二乘支持向量机 变分模态分解 变分模态分解 刀具状态监测 刀具状态监测 特征优化 特征优化
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| GB/T 7714 | 蔡力钢 , 李海波 , 杨聪彬 et al. 基于改进VMD和自适应BSA优化LS-SVM的刀具磨损状态监测方法 [J]. | 北京工业大学学报 , 2021 , 47 (01) : 10-23 . |
| MLA | 蔡力钢 et al. "基于改进VMD和自适应BSA优化LS-SVM的刀具磨损状态监测方法" . | 北京工业大学学报 47 . 01 (2021) : 10-23 . |
| APA | 蔡力钢 , 李海波 , 杨聪彬 , 刘志峰 , 赵永胜 . 基于改进VMD和自适应BSA优化LS-SVM的刀具磨损状态监测方法 . | 北京工业大学学报 , 2021 , 47 (01) , 10-23 . |
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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
引用：
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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 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
基于改进VMD和自适应BSA优化LS-SVM的刀具磨损状态监测方法
关键词 ：
振动信号 振动信号 特征优化 特征优化 变分模态分解 变分模态分解 最小二乘支持向量机 最小二乘支持向量机 回溯搜索算法 回溯搜索算法 刀具状态监测 刀具状态监测
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 | 蔡力钢 , 李海波 , 杨聪彬 et al. 基于改进VMD和自适应BSA优化LS-SVM的刀具磨损状态监测方法 [J]. | 蔡力钢 , 2021 , 47 (1) : 10-23 . |
| MLA | 蔡力钢 et al. "基于改进VMD和自适应BSA优化LS-SVM的刀具磨损状态监测方法" . | 蔡力钢 47 . 1 (2021) : 10-23 . |
| APA | 蔡力钢 , 李海波 , 杨聪彬 , 刘志峰 , 赵永胜 , 北京工业大学学报 . 基于改进VMD和自适应BSA优化LS-SVM的刀具磨损状态监测方法 . | 蔡力钢 , 2021 , 47 (1) , 10-23 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
The machine bed and the concrete foundation are connected by anchor bolts. Foundation creep is a comprehensive manifestation of foundation stability. The size and change of foundation creep affect the dynamic characteristics of the bed-foundation interface and the working state of heavy machine tools. In this paper, the contact problem between bed and foundation made of heterogeneous materials is solved, a concrete crushing hypothesis is proposed, and the basis for determining the elastic-elastoplastic-crushing critical deformation parameters of the concrete surface is formulated. Based on the Hertz contact and fractal theories, an equivalent contact model of the joint is developed, revealing the nonlinear mechanical behavior of the bolted contact surface. The cement hydration and foundation creep factors under continuous loading are taken simultaneously into consideration, and the change trend of the compressive strength and elastic modulus of the concrete at the later stage of loading is determined. By comprehensively analyzing the simulation and experimental results, the error of the theoretical model was found to be within 10%, which verifies the correctness of the proposed theoretical model. Finally, by assuming that the external load remains unchanged, a contact stiffness prediction model based on foundation creep is developed, which can provide a new basis for the contact modeling of bed-concrete foundation joint surfaces.
关键词 ：
Heterogeneous materials Heterogeneous materials Contact stiffness Contact stiffness Prediction model Prediction model Joint surface Joint surface Foundation creep Foundation creep
引用：
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| GB/T 7714 | Zhao Yongsheng , Niu Nana , Chu Hongyan et al. Calculation method of the contact stiffness of bed-foundation interfaces considering foundation creep [J]. | JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING , 2021 , 43 (9) . |
| MLA | Zhao Yongsheng et al. "Calculation method of the contact stiffness of bed-foundation interfaces considering foundation creep" . | JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING 43 . 9 (2021) . |
| APA | Zhao Yongsheng , Niu Nana , Chu Hongyan , Li Ying , Jiang Kai , Meng Lingjun . Calculation method of the contact stiffness of bed-foundation interfaces considering foundation creep . | JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING , 2021 , 43 (9) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
The thermal contact resistance (TCR) of a spindle-bearing joint is crucial in the analysis of thermal characteristics of high speed motorized spindle, which could severely affect the machining accuracy of a machine tool. In this research, firstly, an experimental set-up was designed and the one-dimensional steady measurement method was introduced to obtain the TCR of an annular contact surface with various tolerance fits. Secondly, a TCR model of an annular contact surface for the spindle-bearing joint with various tolerance fits was proposed. The TCR model was obtained by the constrained thermal resistance, the bulk thermal resistance and the air thermal resistance. Finally, the clearance, transition and interference fits were considered as three typical cases. The TCR of the interference fit could be calculated based on the proposed model and the contact load derived from the contact formula. However, this method was not suitable for the cases of clearance and transition fits. In this case, a hybrid method was utilized to determine the corresponding equivalent contact load. The results demonstrated that the proposed model could be utilized to predict the TCR of annular surfaces with various tolerance fits.
关键词 ：
spindle-bearing joint spindle-bearing joint thermal contact resistance thermal contact resistance tolerance fit tolerance fit contact load contact load fractal theory fractal theory
引用：
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| GB/T 7714 | Fang, Cui , Yang, Cong-Bin , Hu, Qiu-shi et al. Thermal Contact Resistance Model of Annular Contact Surfaces with Various Tolerance Fits for Spindle-Bearing Joint [J]. | JOURNAL OF THE CHINESE SOCIETY OF MECHANICAL ENGINEERS , 2021 , 42 (3) : 285-294 . |
| MLA | Fang, Cui et al. "Thermal Contact Resistance Model of Annular Contact Surfaces with Various Tolerance Fits for Spindle-Bearing Joint" . | JOURNAL OF THE CHINESE SOCIETY OF MECHANICAL ENGINEERS 42 . 3 (2021) : 285-294 . |
| APA | Fang, Cui , Yang, Cong-Bin , Hu, Qiu-shi , Zhao, Yong-Sheng , Liu, Zhi-Feng . Thermal Contact Resistance Model of Annular Contact Surfaces with Various Tolerance Fits for Spindle-Bearing Joint . | JOURNAL OF THE CHINESE SOCIETY OF MECHANICAL ENGINEERS , 2021 , 42 (3) , 285-294 . |
| 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 ：
Various deterministic and uncertain factors are widely present in mechanical equipment and their working conditions. Attenuation of the contact stiffness of bolted joints caused by bolt loosening will directly affect the dynamic characteristics of the joint surface and the working state of the equipment. This paper proposes a contact stiffness attenuation model that considers time-varying uncertainty of the bolt pre-tightening force as a theoretical basis for designing the initial bolt pre-tightening force and secondary tightening strategies. First, the microscopic contact mechanism of the bolted joint surface was revealed, and then a joint contact load and contact stiffness model based on Hertz contact theory and fractal theory was established. A nonlinear mechanical model of the bolted contact surface was obtained. Considering the decrease in bolt pre-tightening force during service, a contact stiffness attenuation law for bolted joints is explored, and a model of the connection reliability of group bolt joints with time-varying uncertainty is established. The bolt pre-tightening force of a railway locomotive was taken as an example and the connection reliability of group bolt structures was predicted, and it is defined that the bolted structure fails when the contact stiffness drops to 80% of the initial value, and the reliability of the group bolts will drop sharply on the 15th day after service, and will almost completely fail on the 22nd day. The proposed theory improves the accuracy of contact modeling and provides a new direction for bolt tightening strategies.
关键词 ：
Bolted joint surface Bolted joint surface Reliability prediction Reliability prediction Stiffness attenuation Stiffness attenuation Time-varying uncertainty Time-varying uncertainty
引用：
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| GB/T 7714 | Nana, Niu , Zhao Yongsheng , Yang Congbin et al. Contact stiffness attenuation model of bolted joint based on time-varying uncertainty [J]. | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2021 . |
| MLA | Nana, Niu et al. "Contact stiffness attenuation model of bolted joint based on time-varying uncertainty" . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY (2021) . |
| APA | Nana, Niu , Zhao Yongsheng , Yang Congbin , Wu Hongchao , Ying, Li , Tao, Zhang . Contact stiffness attenuation model of bolted joint based on time-varying uncertainty . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2021 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
本发明公开了一种专用数控摆角铣头的动静热特性测试自动可调姿工装，通过该工装向铣头不同方向施加不同的载荷，从而得到该特种铣头的形变量，进而得到该铣头静刚度、模态振型、热变形等各项特性。由于该特种铣头具有A、B、C三个方向的旋转轴，使用该专用检验装置对铣头进行法向载荷加载后利用力、位移传感器(或百分表)测得施加载荷大小及铣头各方向的变形量。本发明针对该铣头三旋转轴特点，操作简单，可调性高，耐用性好。
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| GB/T 7714 | 王建华 , 李志雄 , 赵永胜 et al. 一种专用数控摆角铣头的动静热特性测试自动可调姿工装 : CN202110092960.5[P]. | 2021-01-25 . |
| MLA | 王建华 et al. "一种专用数控摆角铣头的动静热特性测试自动可调姿工装" : CN202110092960.5. | 2021-01-25 . |
| APA | 王建华 , 李志雄 , 赵永胜 , 赵鹏睿 , 曹子睿 , 苏李航 et al. 一种专用数控摆角铣头的动静热特性测试自动可调姿工装 : CN202110092960.5. | 2021-01-25 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
In actual engineering, material properties, load effects, and other factors of mechanical structures change due to long-term use. In order to understand the operation of a mechanical structure in real time, it is crucial to obtain the dynamic trajectory of its reliability. Considering the time variability of a mechanical structure over time, uncertain random variables are introduced to express the uncertainty of various parameters of structures, and the Wiener process is used to describe the strength degradation process of structures so as to solve the calculation problem of time-varying reliability of mechanical structures. Based on the advanced first-order and second moment method (AFOSM), the proposed linearized Nataf change is used to complete the transformation from related nonnormal variables to independent standard normal variables in order to simplify the calculation process of reliability solution and solve the reliability calculation problem of random parameters subjected to arbitrary distribution. The deduced random variable sensitivity factor indicates the degree of influence of different random variables on the reliability of the mechanical structure, providing a theoretical basis for the optimal design and maintenance of a mechanical structure. The proposed method is analyzed using the cantilever beam and compared with the nonlinear Nataf transform and verified by the Monte Carlo simulation results. The results show that the proposed method can effectively solve the reliability sensitivity problem of structural system strength degradation.
关键词 ：
advanced first‐ advanced first‐ linearized Nataf transformation linearized Nataf transformation order and second moment method order and second moment method reliability analysis reliability analysis sensitivity analysis sensitivity analysis strength degradation strength degradation
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| GB/T 7714 | Zhao, Yongsheng , Wang, Lixia , Wu, Hongchao et al. Time-varying reliability method based on linearized Nataf transform [J]. | QUALITY AND RELIABILITY ENGINEERING INTERNATIONAL , 2021 , 37 (5) : 1922-1938 . |
| MLA | Zhao, Yongsheng et al. "Time-varying reliability method based on linearized Nataf transform" . | QUALITY AND RELIABILITY ENGINEERING INTERNATIONAL 37 . 5 (2021) : 1922-1938 . |
| APA | Zhao, Yongsheng , Wang, Lixia , Wu, Hongchao , Chu, Hongyan , Yang, Congbin , Liu, Zhifeng . Time-varying reliability method based on linearized Nataf transform . | QUALITY AND RELIABILITY ENGINEERING INTERNATIONAL , 2021 , 37 (5) , 1922-1938 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
The stiffness and damping modeling of joint surfaces are important for analyzing the dynamic characteristics of bolted joints, which has a great influence on the working precision of the machine tool. In this paper, a damping model is presented to predict the tangential damping of the joint accurately. The fractal theory is introduced to characterize the rough contact surface by using fractal dimension D and fractal roughness parameter G. For each micro-contact, the contact region can be divided into stick section and slip one. The energy dissipation of the micro-contact, which can be described as the tangential damping of bolted joint, emerges in the slip section. The physics-based friction coefficient is introduced to define the energy dissipation function based on the relationship between the deformation of micro-contact and the normal pressure. The energy dissipation factor and the proportional damping of the micro-contact can be obtained. The total tangential damping of bolted joint can be obtained by integrating the whole contact surfaces. Experimental set-up is designed to verify the proposed model. Compared with the constant friction coefficient damping model, the results show that the proposed model can more accurately describe the tangential damping of bolted joint. © 2021, Korean Society for Precision Engineering.
关键词 ：
Bolted joints Bolted joints Bolts Bolts Damping Damping Energy dissipation Energy dissipation Fractal dimension Fractal dimension Friction Friction Machine tools Machine tools
引用：
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| GB/T 7714 | Zhao, Yongsheng , Wu, Hongchao , Yang, Congbin et al. Tangential Damping Model of Bolted Joint with the Physics-Based Friction Coefficient [J]. | International Journal of Precision Engineering and Manufacturing , 2021 , 22 (5) : 865-875 . |
| MLA | Zhao, Yongsheng et al. "Tangential Damping Model of Bolted Joint with the Physics-Based Friction Coefficient" . | International Journal of Precision Engineering and Manufacturing 22 . 5 (2021) : 865-875 . |
| APA | Zhao, Yongsheng , Wu, Hongchao , Yang, Congbin , Liu, Zhifeng , Cheng, Qiang . Tangential Damping Model of Bolted Joint with the Physics-Based Friction Coefficient . | International Journal of Precision Engineering and Manufacturing , 2021 , 22 (5) , 865-875 . |
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