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学者姓名：蔡力钢
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Abstract ：
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
Keyword ：
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
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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]. | 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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Abstract ：
提出了一种模锻成型过程中基于模具磨损的工艺参数优化方法和一种基于多项式拟合的模具寿命预测方法。将正交试验中的方差分析法与模锻加工过程中的有限元仿真试验相结合,推导出模锻成型过程中对模具磨损影响程度最大的工艺参数及使模具磨损量实现最小值的工艺参数最优解。以热模锻工艺为例,在Archard磨损模型的基础上,推导出适用于热模锻工艺的模具磨损修正模型,并且对热模锻中模具磨损过程进行基于Deform软件的有限元仿真分析。研究了热模锻加工过程中模具工作表面的磨损深度与模锻工艺参数之间的关系,利用正交试验设计和方差分析法推导出适用于热模锻的最优化工艺参数。通过计算模具表面多个关键性节点的磨损深度,根据模具平...
Keyword ：
模具寿命预测 模具寿命预测 方差分析法 方差分析法 模具磨损 模具磨损 Deform Deform 模锻工艺 模锻工艺
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| GB/T 7714 | 蔡力钢 , 刘海东 , 潘俊杰 et al. 基于方差分析的模锻模具磨损研究及模具寿命预测（英文） [J]. | Transactions of Nanjing University of Aeronautics and Astronautics , 2020 , 37 (06) : 872-883 . |
| MLA | 蔡力钢 et al. "基于方差分析的模锻模具磨损研究及模具寿命预测（英文）" . | Transactions of Nanjing University of Aeronautics and Astronautics 37 . 06 (2020) : 872-883 . |
| APA | 蔡力钢 , 刘海东 , 潘俊杰 , 程强 , 初红艳 . 基于方差分析的模锻模具磨损研究及模具寿命预测（英文） . | Transactions of Nanjing University of Aeronautics and Astronautics , 2020 , 37 (06) , 872-883 . |
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Abstract ：
Computer numerical controlled (CNC) machine tools are comprised of numerous parts mainly connected by bolts. Accurate modeling of the contact stiffness of bolted joints is therefore a crucial element in predicting the dynamic performance of CNC machine tools. This paper presents a contact stiffness model of a bolted joint based on multi-scale theory. The model uses a series of stacked three-dimensional sine waves to describe the multi-scale roughness of the contact surface, and each frequency level is considered to be a single layer of asperities, which are stacked on top of each other. A relationship between the contact area ratio and frequency level can be deduced. Moreover, the contact stiffness at each frequency level can be represented within the model as a spring in series, therefore, the total stiffness is obtained by summing the contact stiffness at each frequency level. An experimental setup consisting of a box-shaped specimen was used to validate the numerical model of the bolted joint for the case of equal bolt pre-tightening forces and relative errors between the multi-scale natural frequencies and experimental frequencies were found to be less than 5.91%. This suggests the multi-scale model can be used to effectively predict the dynamic characteristics of CNC machine tools.
Keyword ：
bolted joint bolted joint CNC machine tool CNC machine tool dynamic performance dynamic performance frequency level frequency level multi-scale theory multi-scale theory
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| GB/T 7714 | Yang, Cheng , Zhao, Yong-Sheng , Liu, Zhi-Feng et al. Stiffness Model of Bolted Joint of Machine Tool Based on Multi-scale Theory [J]. | JOURNAL OF THE CHINESE SOCIETY OF MECHANICAL ENGINEERS , 2020 , 41 (2) : 159-168 . |
| MLA | Yang, Cheng et al. "Stiffness Model of Bolted Joint of Machine Tool Based on Multi-scale Theory" . | JOURNAL OF THE CHINESE SOCIETY OF MECHANICAL ENGINEERS 41 . 2 (2020) : 159-168 . |
| APA | Yang, Cheng , Zhao, Yong-Sheng , Liu, Zhi-Feng , Cai, Li-Gang . Stiffness Model of Bolted Joint of Machine Tool Based on Multi-scale Theory . | JOURNAL OF THE CHINESE SOCIETY OF MECHANICAL ENGINEERS , 2020 , 41 (2) , 159-168 . |
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Abstract ：
Computer numerical controlled (CNC) machine tools are comprised of numerous parts mainly connected by bolts. Accurate modeling of the contact stiffness of bolted joints is therefore a crucial element in predicting the dynamic performance of CNC machine tools. This paper presents a contact stiffness model of a bolted joint based on multi-scale theory. The model uses a series of stacked three-dimensional sine waves to describe the multi-scale roughness of the contact surface, and each frequency level is considered to be a single layer of asperities, which are stacked on top of each other. A relationship between the contact area ratio and frequency level can be deduced. Moreover, the contact stiffness at each frequency level can be represented within the model as a spring in series, therefore, the total stiffness is obtained by summing the contact stiffness at each frequency level. An experimental setup consisting of a box-shaped specimen was used to validate the numerical model of the bolted joint for the case of equal bolt pre-tightening forces and relative errors between the multi-scale natural frequencies and experimental frequencies were found to be less than 5.91%. This suggests the multi-scale model can be used to effectively predict the dynamic characteristics of CNC machine tools. © 2020, Chinese Mechanical Engineering Society. All right reserved.
Keyword ：
Bolted joints Bolted joints Bolt tightening Bolt tightening Computer control systems Computer control systems Machine tools Machine tools Stiffness Stiffness
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| GB/T 7714 | Yang, Cheng , Zhao, Yong-Sheng , Liu, Zhi-Feng et al. Stiffness Model of Bolted Joint of Machine Tool Based on Multi-scale Theory [J]. | Chung-Kuo Chi Hsueh Kung Ch'eng Hsuebo Pao , 2020 , 41 (2) : 159-168 . |
| MLA | Yang, Cheng et al. "Stiffness Model of Bolted Joint of Machine Tool Based on Multi-scale Theory" . | Chung-Kuo Chi Hsueh Kung Ch'eng Hsuebo Pao 41 . 2 (2020) : 159-168 . |
| APA | Yang, Cheng , Zhao, Yong-Sheng , Liu, Zhi-Feng , Cai, Li-Gang . Stiffness Model of Bolted Joint of Machine Tool Based on Multi-scale Theory . | Chung-Kuo Chi Hsueh Kung Ch'eng Hsuebo Pao , 2020 , 41 (2) , 159-168 . |
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Abstract ：
Harmonic drive is an indispensable device for robotic joint, and transmission accuracy of harmonic drive is one of its most important performance indexes. Due to the unsystematic research on the accuracy of harmonic drive, the accuracy consistency of harmonic drive is poor, and the prediction accuracy is seriously insufficient. This study focuses on modeling of transmission error system and prediction of transmission accuracy. Through tracing analysis of transmission error of harmonic drive, a transmission error model including manufacturing, assembly and tooth profile error is established. Based on Rayleigh distribution of error sources and considering multi-tooth meshing effect of harmonic drive, the transmission accuracy prediction model is built. Tooth profile error is measured by gear measuring center, dimension error and geometric tolerance are gauged by coordinate measuring machine. The transmission accuracy of three types harmonic drive (SHG14, SHG20 and SHG25) is measured by harmonic transmission error test bench under rated conditions. The comparison results show that the difference between the predicted and experimental values is less than 15%, which proves the validity of the accuracy prediction model. Prediction method play a crucial role for accuracy control of harmonic drive system.
Keyword ：
harmonic drive harmonic drive prediction method prediction method sensitivity analysis sensitivity analysis transmission accuracy transmission accuracy
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| GB/T 7714 | Hu, Qiushi , Liu, Zhifeng , Cai, Ligang et al. RESEARCH ON PREDICTION METHOD OF TRANSMISSION ACCURACY OF HARMONIC DRIVE [C] . 2020 . |
| MLA | Hu, Qiushi et al. "RESEARCH ON PREDICTION METHOD OF TRANSMISSION ACCURACY OF HARMONIC DRIVE" . (2020) . |
| APA | Hu, Qiushi , Liu, Zhifeng , Cai, Ligang , Yang, Congbin , Zhang, Tao , Wang, Guang . RESEARCH ON PREDICTION METHOD OF TRANSMISSION ACCURACY OF HARMONIC DRIVE . (2020) . |
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Abstract ：
本发明公开了一种基于改进惯性权重粒子群算法的装配序列规划方法，本方法主要是考虑装配问题求解过程中，粒子群算法的求解效率较低，因此，为了更好地更新粒子群的空间位置，本方法将传统标准的w固定模式改进为在考虑全局最优值的变化情况下，以迭代次数为变量的非连续性变化的可调节参数模式，可以有效提高粒子群算法的收敛准确性和全局搜索能力，得到较好的优化可行解。
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| GB/T 7714 | 蔡力钢 , 侯玉晴 , 赵永胜 et al. 一种基于改进惯性权重粒子群算法的装配序列规划方法 : CN202010030748.1[P]. | 2020-01-13 . |
| MLA | 蔡力钢 et al. "一种基于改进惯性权重粒子群算法的装配序列规划方法" : CN202010030748.1. | 2020-01-13 . |
| APA | 蔡力钢 , 侯玉晴 , 赵永胜 , 王建华 . 一种基于改进惯性权重粒子群算法的装配序列规划方法 : CN202010030748.1. | 2020-01-13 . |
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Abstract ：
本发明公开了一种基于改进惯性权重粒子群算法的装配序列规划方法，本方法主要是考虑装配问题求解过程中，粒子群算法的求解效率较低，因此，为了更好地更新粒子群的空间位置，本方法将传统标准的w固定模式改进为在考虑全局最优值的变化情况下，以迭代次数为变量的非连续性变化的可调节参数模式，可以有效提高粒子群算法的收敛准确性和全局搜索能力，得到较好的优化可行解。
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| GB/T 7714 | 蔡力钢 , 侯玉晴 , 赵永胜 et al. 一种基于改进惯性权重粒子群算法的装配序列规划方法 : CN202010030748.1[P]. | 2020-01-13 . |
| MLA | 蔡力钢 et al. "一种基于改进惯性权重粒子群算法的装配序列规划方法" : CN202010030748.1. | 2020-01-13 . |
| APA | 蔡力钢 , 侯玉晴 , 赵永胜 , 王建华 . 一种基于改进惯性权重粒子群算法的装配序列规划方法 : CN202010030748.1. | 2020-01-13 . |
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Abstract ：
本发明公开了一种基于改进粒子群算法的装配序列规划方法，本方法考虑装配问题求解过程中，粒子群算法容易陷入局部优化，出现多个优化解，但实际可行优化解效率较低，因此，根据迭代过程中全局最优值的实际更新情况，改进标准粒子群算法中的w参数，以前后两次的全局最优最优值的变化与否为基础，通过对w参数的自适应调整，提高算法的收敛精度和全局搜索能力。将传统标准的w固定模式改进为在考虑全局最优值的变化情况下，以迭代次数为变量的非连续性变化的可调节参数模式，可以有效提高粒子群算法的收敛准确性和全局搜索能力，较好地解决在装配序列规划问题中出现的可行解效率较低的问题。
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| GB/T 7714 | 蔡力钢 , 侯玉晴 , 赵永胜 et al. 一种基于改进粒子群算法的装配序列规划方法 : CN202010030756.6[P]. | 2020-01-13 . |
| MLA | 蔡力钢 et al. "一种基于改进粒子群算法的装配序列规划方法" : CN202010030756.6. | 2020-01-13 . |
| APA | 蔡力钢 , 侯玉晴 , 赵永胜 , 王建华 . 一种基于改进粒子群算法的装配序列规划方法 : CN202010030756.6. | 2020-01-13 . |
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Abstract ：
介绍了一种高架桥式重型龙门加工中心横梁从初始构型设计到最终确定板件具体尺寸的优化设计方法,首先针对高架桥式重型龙门加工中心横梁承受随动载荷的工况,以及焊接工艺及操作空间的制造限制条件,建立基于变密度法SIMP插值的拓扑优化数学模型,采用启发式调整法对变量进行迭代更新的优化准则法(optimality criteria,OC)算法,利用灵敏度过滤技术抑制棋盘格、增强网格独立性,借助MATLAB编程进行结构拓扑优化,得到横梁初始构型;再以横梁主要板件厚度为设计变量,建立响应面模型,计算刚度和固有频率对板件厚度的灵敏度;采用带有精英策略的第二代非劣排序遗传算法NSGA-II对响应面模型进行多目标优化,在Pareto解集中选出最优解,并基于灵敏度分析对设计变量进行取整修正,优化后的横梁动静态性能满足工程要求,目前已经应用到工程实践中,具有很强实用性.
Keyword ：
高架桥式 高架桥式 多目标优化 多目标优化 变密度法 变密度法 优化设计 优化设计 龙门横梁 龙门横梁 响应面模型 响应面模型
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| GB/T 7714 | 李志杰 , 蔡力钢 , 刘志峰 et al. 高架桥式重型龙门加工中心横梁优化设计 [J]. | 北京工业大学学报 , 2020 , 46 (5) : 440-447 . |
| MLA | 李志杰 et al. "高架桥式重型龙门加工中心横梁优化设计" . | 北京工业大学学报 46 . 5 (2020) : 440-447 . |
| APA | 李志杰 , 蔡力钢 , 刘志峰 , 郭铁能 . 高架桥式重型龙门加工中心横梁优化设计 . | 北京工业大学学报 , 2020 , 46 (5) , 440-447 . |
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Abstract ：
The effect of preload relaxation caused by the mechanical vibration on loosening of bolted joints with self-locking capability has been widely observed. This paper proposed a combination testing strategy involving tightening and relaxation to elucidate the loss mechanism of bolt preload. A logarithmic relationship between torque coefficient and tightening torque is reported based on the results of fastening tests. Two types of specimen were designed to evaluate the preload relaxation under axial and transverse vibration. A time-varying model is proposed for predicting the residual preload of bolts. An orthogonal test involving tightening torque, amplitude, and frequency was conducted. The results show that the relaxation evolution of bolted joints subjected to vibration is similar and can be divided into two stages.
Keyword ：
Torque coefficient Torque coefficient Vibration Vibration Bolted joint Bolted joint Preload relaxation Preload relaxation
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| GB/T 7714 | Li, Ying , Liu, Zhifeng , Wang, Yuezhen et al. Experimental study on behavior of time-related preload relaxation for bolted joints subjected to vibration in different directions [J]. | TRIBOLOGY INTERNATIONAL , 2020 , 142 . |
| MLA | Li, Ying et al. "Experimental study on behavior of time-related preload relaxation for bolted joints subjected to vibration in different directions" . | TRIBOLOGY INTERNATIONAL 142 (2020) . |
| APA | Li, Ying , Liu, Zhifeng , Wang, Yuezhen , Cai, Ligang , Zheng, Mingpo . Experimental study on behavior of time-related preload relaxation for bolted joints subjected to vibration in different directions . | TRIBOLOGY INTERNATIONAL , 2020 , 142 . |
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