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学者姓名:刘志峰
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摘要 :
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.
关键词 :
Bolted connection Bolted connection Integrability Integrability Preload Preload Second-order spectral problem Second-order spectral problem
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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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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
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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 . |
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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 :
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
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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 . |
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摘要 :
本发明公开了一种用于辅助定位摆角铣头B轴回转中心的装置,由主体固定支架和回转中心调整机构两部分组成:主体固定支架主要由为摆角铣头端面连接板、WR50转台连接板组成。回转中心调整机构主要由铅垂位置调整机构和水平位置调整机构组成。本发明通过调整铅垂位置调整机构和水平位置调整机构的位置,可以较精确的对摆角铣头B轴回转中心进行定位。铅垂位置调整机构和水平位置调整机构采用螺纹驱动,其定位较高且包含自锁功能。较现有仅通过手动松紧螺栓调整WR50转台的位置定位摆角铣头B轴回转中心的方法,通过该装置可显著提升效率和定位精度。
引用:
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GB/T 7714 | 刘志峰 , 曹子睿 , 赵鹏睿 et al. 一种用于辅助定位摆角铣头B轴回转中心的装置 : CN202110235524.9[P]. | 2021-03-03 . |
MLA | 刘志峰 et al. "一种用于辅助定位摆角铣头B轴回转中心的装置" : CN202110235524.9. | 2021-03-03 . |
APA | 刘志峰 , 曹子睿 , 赵鹏睿 , 李志雄 , 苏李航 . 一种用于辅助定位摆角铣头B轴回转中心的装置 : CN202110235524.9. | 2021-03-03 . |
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摘要 :
本发明公开了一种基于等参数曲线法的复杂曲面残余高度计算方法,主要用于计算球头铣刀加工复杂曲面时,曲面残余高度的计算。包括对自由曲面进行参数化,通过等参数曲线法生成加工刀路轨迹并根据曲面的uv离散成若散点,然后对其中一条轨迹上的散点进行投影和坐标变换,得到二维平面上的工件表面。对工件表面的坐标点采用多项式拟合,得到表征函数方程,对刀具切削曲面表面的过程进行数学建模,计算得到表面残余高度与行距之间的关系。本发明应用于球头铣刀加工复杂曲面时,计算不同加工行距下对曲面残余高度的计算,对加工过程中行距的选择起到一定的指导作用,从而在保证加工精度的同时尽可能提高加工效率。
引用:
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GB/T 7714 | 刘志峰 , 曹子睿 , 初红艳 et al. 一种基于等参数曲线法的复杂曲面残余高度计算方法 : CN202110024645.9[P]. | 2021-01-08 . |
MLA | 刘志峰 et al. "一种基于等参数曲线法的复杂曲面残余高度计算方法" : CN202110024645.9. | 2021-01-08 . |
APA | 刘志峰 , 曹子睿 , 初红艳 , 董亚 , 苏李航 . 一种基于等参数曲线法的复杂曲面残余高度计算方法 : CN202110024645.9. | 2021-01-08 . |
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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:
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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]. | 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 . |
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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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