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学者姓名:程强
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Abstract :
As increasingly extensive applications of flexible manufacturing systems (FMSs) arise, their reliability allocation has been a research hot spot. But, since FMSs are always composed of transfer and buffer devices, production machines, and complex control systems, the large number of basic elements makes the number of variables and constraints of reliability-allocation optimization increase greatly, which leads to the difficulty and inefficiency of optimization. To solve the above problem, two dimension-reduction strategies are proposed for the FMS reliability optimization with low cost and a high level of reliability as the objectives, and they are the reliability-weight double-threshold qualification strategy (RWTS) and the bi-level optimization strategy (BLOS), respectively. Based on these two strategies, an overall reliability-allocation optimization model and a bi-level reliability-allocation optimization model are established based on the FMS reliability evaluation presented in our previous work, and their algorithms based on particle swarm optimization (PSO) are presented. In terms of their contributions, for the RWTS, thresholds of reliability and the weight index of each basic element are set to dynamically reduce the number of variables in each iteration of the optimization; for the BLOS, the overall reliability-allocation optimization problem for transitioning from the FMS to basic elements can be transformed into simpler allocation optimizations from the FMS to subsystems and from subsystems to basic elements, which have fewer variables, and this can largely improve the optimization convergence performance. Through applying this to a box-parts finishing FMS, compared with the traditional optimization method, the high efficiency and the good allocation effect of the optimization based on these two strategies for improving convergence speed are verified by the simulation results. The proposed method has great significance for FMS design due to its limited cost but high-reliability requirement.
Keyword :
reliability evaluation reliability evaluation reliability allocation reliability allocation reliability index system reliability index system dimension-reduction strategy dimension-reduction strategy flexible manufacturing system (FMS) flexible manufacturing system (FMS)
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GB/T 7714 | Xu, Jingjing , Tao, Long , Pei, Yanhu et al. An Optimization Method of Flexible Manufacturing System Reliability Allocation Based on Two Dimension-Reduction Strategies [J]. | MACHINES , 2024 , 12 (1) . |
MLA | Xu, Jingjing et al. "An Optimization Method of Flexible Manufacturing System Reliability Allocation Based on Two Dimension-Reduction Strategies" . | MACHINES 12 . 1 (2024) . |
APA | Xu, Jingjing , Tao, Long , Pei, Yanhu , Liu, Zhifeng , Yan, Qiaobin , Cheng, Qiang . An Optimization Method of Flexible Manufacturing System Reliability Allocation Based on Two Dimension-Reduction Strategies . | MACHINES , 2024 , 12 (1) . |
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Ionic liquids (ILs) are molten organic salts consisting of organic cations and weakly coordinating organic/inorganic anions at room temperature. ILs have excellent physical and chemical properties such as high thermal stability, high combustible temperature, high miscibility with organic compounds and so on, making them good candidates for high performance lubricants and lubricant additives. The functional designability of ILs makes them novel lubrication materials that can break through the bottleneck of the active control of friction and lubrication. This paper firstly briefly introduces how to design the physical and chemical properties of the ILs required for different friction conditions by bonding specific cations with anions. Then, the lubrication mechanisms of ILs as base lubricants and additives for oils and water are focused on. The correlation between the structure of ILs and the lubrication results are established, which can guide the structural design of ILs in different applications. The response behaviors of friction characteristics under external electric fields are analyzed, which can provide a theoretical basis for the intelligent control of friction based on ILs.
Keyword :
ionic liquids ionic liquids additive additive external electric field external electric field lubricant lubricant lubrication mechanism lubrication mechanism
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GB/T 7714 | Liu, Mengmeng , Ni, Jing , Zhang, Caixia et al. The Application of Ionic Liquids in the Lubrication Field: Their Design, Mechanisms, and Behaviors [J]. | LUBRICANTS , 2024 , 12 (1) . |
MLA | Liu, Mengmeng et al. "The Application of Ionic Liquids in the Lubrication Field: Their Design, Mechanisms, and Behaviors" . | LUBRICANTS 12 . 1 (2024) . |
APA | Liu, Mengmeng , Ni, Jing , Zhang, Caixia , Wang, Ruishen , Cheng, Qiang , Liang, Weihao et al. The Application of Ionic Liquids in the Lubrication Field: Their Design, Mechanisms, and Behaviors . | LUBRICANTS , 2024 , 12 (1) . |
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Abstract :
A method of hyperstatic mechanics analysis of guideway assembly and motion errors prediction under thread friction coefficient uncertainties is proposed. Based on the probability distribution characteristics and uncer-tainty analysis of the friction coefficient, the hyperstatic mechanic's equations of guideway assembly are established. By the geometric relation between the guideway profile curve and the motion errors, the motion straightness and angle errors (SAEs) are predicted. The results show that the guideway assembly can offset a part of the manufacturing error wavelength, which makes an important contribution to the error averaging effect. Combined with the error test results, the prediction accuracy of motion errors is above 81%, which verifies the effectiveness of the proposed method.
Keyword :
Hyperstatic mechanics analysis Hyperstatic mechanics analysis Error averaging effect Error averaging effect Thread friction coefficient uncertainties Thread friction coefficient uncertainties Straightness and angle errors (SAEs) Straightness and angle errors (SAEs)
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GB/T 7714 | Niu, Peng , Cheng, Qiang , Zhang, Tao et al. Hyperstatic mechanics analysis of guideway assembly and motion errors prediction method under thread friction coefficient uncertainties [J]. | TRIBOLOGY INTERNATIONAL , 2023 , 180 . |
MLA | Niu, Peng et al. "Hyperstatic mechanics analysis of guideway assembly and motion errors prediction method under thread friction coefficient uncertainties" . | TRIBOLOGY INTERNATIONAL 180 (2023) . |
APA | Niu, Peng , Cheng, Qiang , Zhang, Tao , Yang, Congbin , Zhang, Ziling , Liu, Zhifeng . Hyperstatic mechanics analysis of guideway assembly and motion errors prediction method under thread friction coefficient uncertainties . | TRIBOLOGY INTERNATIONAL , 2023 , 180 . |
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Background and Objectives: The existing medical clinical treatment institutions mostly use rigid structures to come into contact with flexible skin. The rigid flexible coupled contact biomechanical model for the skin is the first step that urgently needs to be considered in the process of medical clinical operations. However, there has been currently no effective biomechanical contact model available. Methods: Based on the principle of elastic interface deformation, the basic biomechanical characteristics of oral and maxillofacial skin and soft tissues were analyzed to address the unknown mechanism of rigid body and maxillofacial contact in oral imaging operations. A nonlinear characterization method for the mechanical properties of oral and maxillofacial skin soft tissues was proposed by deriving a general contact force model that takes into account energy dissipation. However, the problem of the inability to obtain analytical solutions for the parameters of the dynamic model exists. It is necessary to perform particle swarm parameter identification on different nonlinear contact models and verify the accuracy of the algorithm through numerical simulation. A maxillofacial contact experiment was conducted to verify the operation process of an oral imaging robot. Results: After experimental analysis, it was found that the comprehensive average error between the model and the actual contact force was 0.13325 N. The absolute error of the maximum deformation displacement was below 0.18 N, which verified the effectiveness and safety of the contact model in the contact process of the oral imaging robot system. Conclusions: The results indicate that the output force of the model has been in good agreement with the actual contact force.
Keyword :
Oral imaging robot Oral imaging robot identification identification Particle swarm optimization parameter Particle swarm optimization parameter Biomechanics Biomechanics Oral and maxillofacial skin Oral and maxillofacial skin
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GB/T 7714 | Hao, Xiaolong , Cheng, Qiang , Xu, Jingjing et al. Rigid flexible coupling contact mechanism for oral and maxillofacial skin and soft tissues [J]. | JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS , 2023 , 150 . |
MLA | Hao, Xiaolong et al. "Rigid flexible coupling contact mechanism for oral and maxillofacial skin and soft tissues" . | JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS 150 (2023) . |
APA | Hao, Xiaolong , Cheng, Qiang , Xu, Jingjing , Sun, Ting , Wang, Yi , Liu, Zhifeng . Rigid flexible coupling contact mechanism for oral and maxillofacial skin and soft tissues . | JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS , 2023 , 150 . |
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With the increasing applications of the planetary roller screw mechanism (PRSM) in mechanical systems particularly machine tools, a comprehensive mathematical model is required to define the kinematic characteristics and relations of the PRSM, such that its performances can be predicted for reliability analysis and design of machine tools. In this paper, the influences of machining and assembly errors on the motion characteristics of the PRSM are analyzed, and the kinematic model of the PRSM is established considering runout errors and elastic deformation. The planetary roller screw mechanism can be considered as a spring-mass system for analysis of the elastic deformation of the ball screw's thread under inertial force. For the spring-mass system, adjacency matrix is introduced to define the relationships between the elastic displacements of the joints and the deformations of the elements. Then, by considering the balance of force and the coordination of deformation, the nonlinear motion model of the double-nut roller screw is established. The effectiveness of the proposed model is verified by comparing the analytical results with the experimental data.
Keyword :
PRSM PRSM Runout error Runout error Reliability Reliability Elastic deformation Elastic deformation Kinematic model Kinematic model
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GB/T 7714 | Wang, Chang , Zhang, Caixia , Cheng, Qiang et al. Kinematic modeling of a planetary roller screw mechanism considering runout errors and elastic deformation [J]. | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2022 , 124 (11-12) : 4455-4463 . |
MLA | Wang, Chang et al. "Kinematic modeling of a planetary roller screw mechanism considering runout errors and elastic deformation" . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 124 . 11-12 (2022) : 4455-4463 . |
APA | Wang, Chang , Zhang, Caixia , Cheng, Qiang , Zhang, Tao , Shi, Wei , Xue, Deyi . Kinematic modeling of a planetary roller screw mechanism considering runout errors and elastic deformation . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2022 , 124 (11-12) , 4455-4463 . |
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Abstract :
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.
Keyword :
Adaptive control strategy Adaptive control strategy Parameter adjustment Parameter adjustment Degradation compensation Degradation compensation Energy conversion efficiency Energy conversion efficiency 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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Abstract :
以智能化、绿色化作为机床产业的标志和发展方向,介绍了智能绿色制造技术在机床装备中的应用概况.在此基础上,围绕模块化功能设计、智能化工艺规划技术、过程监控和装备性能预测感知技术及智能数控系统和智能控制技术,对智能绿色机床装备技术研究进行了综述,并对先进智能绿色制造技术在机床中的具体应用和国际上机床的发展现状展开了详细分析.旨在通过汲取其他国家在智能绿色制造领域的发展经验和先进技术,以不断增强我国高端机床的行业竞争力.
Keyword :
技术分析 技术分析 模块化功能设计 模块化功能设计 机床装备 机床装备 应用发展 应用发展 智能化工艺规划 智能化工艺规划 智能绿色制造 智能绿色制造
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GB/T 7714 | 程强 , 徐文祥 , 刘志峰 et al. 面向智能绿色制造的机床装备研究综述 [J]. | 华中科技大学学报(自然科学版) , 2022 , 50 (06) : 31-38 . |
MLA | 程强 et al. "面向智能绿色制造的机床装备研究综述" . | 华中科技大学学报(自然科学版) 50 . 06 (2022) : 31-38 . |
APA | 程强 , 徐文祥 , 刘志峰 , 张妤 . 面向智能绿色制造的机床装备研究综述 . | 华中科技大学学报(自然科学版) , 2022 , 50 (06) , 31-38 . |
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Abstract :
为提高滚珠丝杠副的定位精度,提出了一种复合载荷作用下考虑滚珠几何误差的双螺母滚珠丝杠副载荷分布模型,分析了在不同轴向载荷和径向载荷复合作用下所有滚珠接触载荷分布状况,在此基础上分析了滚珠几何误差对滚珠动静态接触载荷分布的影响。仿真分析结果表明:本文提出的载荷分布模型对提高滚珠丝杠副的位置精度预测及其定位误差补偿有较好的参考意义。
Keyword :
滚珠丝杠副 滚珠丝杠副 结构误差 结构误差 双螺母 双螺母 接触载荷 接触载荷
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GB/T 7714 | 程强 , 王畅 , 齐宝宝 et al. 虑及结构参数误差的滚珠丝杠接触载荷建模与分析 [J]. | 吉林大学学报(工学版) , 2022 , 52 (02) : 353-360 . |
MLA | 程强 et al. "虑及结构参数误差的滚珠丝杠接触载荷建模与分析" . | 吉林大学学报(工学版) 52 . 02 (2022) : 353-360 . |
APA | 程强 , 王畅 , 齐宝宝 , 张彩霞 , 杨聪彬 , 刘志峰 . 虑及结构参数误差的滚珠丝杠接触载荷建模与分析 . | 吉林大学学报(工学版) , 2022 , 52 (02) , 353-360 . |
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Abstract :
可靠性分配是数控机床可靠性优化设计的重要任务,传统上可靠性分配方法存在分配影响因子单一和主观经验过多等缺陷。为了解决这些问题,运用主客观相结合的方法,综合考虑了多种影响因素,根据影响因素重要性给予不同的直觉梯形模糊数,运用最大熵有序加权算子(ME-OWA)赋予影响因素有序的权重最后综合多位专家判断,利用逼近理想点排序法(TOPSIS)来灵活分配子系统的可靠性。通过以数控机床八个子系统例分析并且与传统的FOO与模糊分配方法比较,证明了所提出的方法有效性、准确性。
Keyword :
数控机床 数控机床 TOPSIS TOPSIS 直觉梯形模糊数 直觉梯形模糊数 ME-OWA ME-OWA 可靠性分配 可靠性分配
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GB/T 7714 | 赵永胜 , 丁紫远 , 杨聪彬 et al. 直觉梯形模糊数与熵权-TOPSIS的可靠性分配 [J]. | 组合机床与自动化加工技术 , 2022 , PageCount-页数: 6 (01) : 76-80,84 . |
MLA | 赵永胜 et al. "直觉梯形模糊数与熵权-TOPSIS的可靠性分配" . | 组合机床与自动化加工技术 PageCount-页数: 6 . 01 (2022) : 76-80,84 . |
APA | 赵永胜 , 丁紫远 , 杨聪彬 , 程强 , 刘志峰 . 直觉梯形模糊数与熵权-TOPSIS的可靠性分配 . | 组合机床与自动化加工技术 , 2022 , PageCount-页数: 6 (01) , 76-80,84 . |
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Abstract :
滚珠丝杠副是数控机床机械传动的重要部件,机床切削参数的不断变化致使其承受的轴向负载具有动态时变的特性,进而其精度、预紧力、摩擦力矩等性能的衰退呈现出时变特性.为了研究滚珠丝杠副在时变轴向加载工况下的性能变化规律,在建立时变受力模型的基础上,通过弹性赫兹理论推导建立了时变轴向力工况下双螺母滚珠丝杠副的时变受力模型、时变磨损模型、时变预紧力和摩擦力矩衰退模型,并且通过滚珠丝杠副精度保持性试验台用激光干涉仪测量序进轴向力加载与恒定轴向力加载工况下的滚珠丝杠磨损深度变化情况,与理论模型对比,由此验证滚珠丝杠副时变轴向力加载性能衰退模型的有效性与合理性.论文的研究对于提升精密滚珠丝杠副的精度及其保持性具...
Keyword :
时变轴向载荷 时变轴向载荷 磨损规律 磨损规律 摩擦力矩 摩擦力矩 预紧力衰退 预紧力衰退 滚珠丝杠副 滚珠丝杠副 加速退化试验 加速退化试验
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GB/T 7714 | 程强 , 计冬雪 , 初红艳 et al. 时变轴向力负载影响下滚珠丝杠副性能衰退特性 [J]. | 北京工业大学学报 , 2022 , 48 (05) : 457-465,551 . |
MLA | 程强 et al. "时变轴向力负载影响下滚珠丝杠副性能衰退特性" . | 北京工业大学学报 48 . 05 (2022) : 457-465,551 . |
APA | 程强 , 计冬雪 , 初红艳 , 齐宝宝 , 郝小龙 , 刘志峰 . 时变轴向力负载影响下滚珠丝杠副性能衰退特性 . | 北京工业大学学报 , 2022 , 48 (05) , 457-465,551 . |
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