作者： Huang, Long;Yin, Lairong*;Liu, Bei;Yang, Yang

期刊： Journal of Mechanical Design,2021年143(1):013301 ISSN：1050-0472

通讯作者： Yin, Lairong

作者机构： [Yin, Lairong; Huang, Long] Changsha Univ Sci & Technol, Sch Automot & Mech Engn, Changsha 410114, Peoples R China.;[Liu, Bei] Changsha Univ Sci & Technol, Sch Automot & Mech Engn, Hunan Prov Key Lab Intelligent Mfg Technol Highpe, Changsha 410114, Peoples R China.;[Yang, Yang] Beihang Univ, Sch Mech Engn & Automat, Beijing 100191, Peoples R China.

通讯机构： [Yin, Lairong] C;Changsha Univ Sci & Technol, Sch Automot & Mech Engn, Changsha 410114, Peoples R China.

关键词： remote center of motion;cable transmission;error evaluation;cable loop;minimally invasive surgery;kinematics

摘要： In a minimally invasive surgical (MIS) robot, the remote center of motion (RCM) mechanism is usually used to realize the constrained motion of the surgical instrument. In this paper, a novel design method for planar 2DOF RCM mechanisms is proposed based on closed-loop cable transmissions. The concept is to utilize several coupled cable transmissions to constrain a serial kinematic chain. Through the analysis and determination of the transmission ratios for these cable transmissions, a class of planar 2DOF RCM mechanisms without any active or passive translational joints is obtained, which provides large workspace and low collision risk for the MIS robots. One of the resulting mechanisms is designed in detail and kinematically analyzed. To evaluate the influence of the elastic cables, a new error model for the proposed RCM mechanism is established through the static analysis and cable deformation analysis. Utilizing this model, the cable-induced error distributions of the tip and the RCM point are obtained, which show that these errors are within a relatively small range. Furthermore, the prototype of the proposed mechanism is built, and the accuracy experiments are conducted.

语种： 英文

作者： 刘鑫;尹来容;胡林

期刊： 机械工程学报,2020年56(2):130-137 ISSN：0577-6686

作者机构： [尹来容; 胡林] Hunan Province Key Laboratory of Safety and Reliability Technology for Engineering Vehicle, Changsha University of Science and Technology, Changsha, 410004, China;State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an, 710049, China;[刘鑫] Hunan Province Key Laboratory of Safety and Reliability Technology for Engineering Vehicle, Changsha University of Science and Technology, Changsha, 410004, China<&wdkj&>State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an, 710049, China

关键词： 缓冲气囊;装备空降;相关性;混合模型;可靠性分析

摘要： 针对多重不确定性因素对缓冲气囊防护特性的影响,提出一种基于概率-椭球混合模型的缓冲气囊防护特性可靠性分析方法。首先,利用概率模型和椭球凸集模型对装备空降过程中的不确定性因素进行描述,并建立缓冲气囊防护特性可靠性分析模型;然后,利用Karush-Kuhn-Tucker最优化条件将可靠性指标求解时面临的双层嵌套优化问题转化成单层优化问题,实现循环嵌套优化问题的解耦,从而提高可靠性指标的求解效率;最后,利用隔代映射遗传算法对气囊防护可靠性指标进行求解,并通过开展装备落地碰撞试验对缓冲气囊的防护特性进行验证。结果表明,该方法能有效对缓冲气囊的防护特性进行可靠性评估,并确保空降装备的安全性,在装备空降技术领域具有一定的实际工程意义。

语种： 中文

作者： Yin, Lairong;Tian, Lei;Huang, Long*;Huang, Juan;Zhou, Dang;...

期刊： Journal of Mechanical Science and Technology,2020年34(2):829-834 ISSN：1738-494X

通讯作者： Huang, Long

作者机构： [Huang, Juan; Tian, Lei; Yin, Lairong; Zhou, Dang; Huang, Long; Jiang, Anwei] Changsha Univ Sci & Technol, Sch Automot & Mech Engn, Changsha 410114, Peoples R China.;[Tian, Lei] Key Lab Safety Design & Reliabil Technol Engn Veh, Changsha 410114, Hunan, Peoples R China.;[Huang, Juan] Hunan Agr Univ, Orient Sci & Technol Coll, Changsha 410012, Peoples R China.;[Zhou, Dang; Jiang, Anwei] Hunan Prov Key Lab Intelligent Mfg Technol High P, Changsha 410114, Peoples R China.

通讯机构： [Huang, Long] C;Changsha Univ Sci & Technol, Sch Automot & Mech Engn, Changsha 410114, Peoples R China.

关键词： Mathematical models;Ball point;Burmester points;Complete solutions;Distribution diagram;Four-bar linkage;Mechanism synthesis;Region based approach;Straight-line mechanisms;Mechanical engineering

摘要： We present a solution-region based approach for the synthesis of straight-line linkages, which is based on the stationary curvature point on curve and higher order stationery point theory of infinite approximation geometry. The selection of the Ball-Burmester point and the distribution of the solution-regions are discussed in this work. Further, two alternative cases have been analyzed for finding the Ball-Burmester point positions of the crank-rocker straight-line mechanism, when one side-link is collinear with the frame. The distribution diagrams of the Ball-Burmester point positions are depicted to help the designers extract complete solutions. Infinite solutions for the mechanism can be expressed for each case on a diagram by employing the solution-region method. These diagrams will help the designers find the inherent mechanism intuitively and streamline the selection of results. The results indicate that the efficiency of design and reliability have been effectively improved owing to the implementation of these methods. © 2020, The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature.

语种： 英文

作者： Cai, Shuo*;He, Binyong;Wang, Weizheng;Liu, Peng;Yu, Fei;...

期刊： JOURNAL OF ELECTRONIC TESTING-THEORY AND APPLICATIONS,2020年36(4):469-483 ISSN：0923-8174

通讯作者： Cai, Shuo

作者机构： [Cai, Shuo; He, Binyong; Wang, Weizheng; Yu, Fei] Changsha Univ Sci & Technol, Sch Comp & Commun Engn, Changsha 410114, Hunan, Peoples R China.;[Liu, Peng] Guangdong Univ Technol, Sch Comp, Guangzhou 510006, Guangdong, Peoples R China.;[Yin, Lairong] Changsha Univ Sci & Technol, Sch Automot & Mech Engn, Changsha 410114, Hunan, Peoples R China.;[Li, Bo] Chinese Acad Sci, Key Lab Silicon Device Technol, Inst Microelect, Beijing 100029, Peoples R China.

通讯机构： [Cai, Shuo] C;Changsha Univ Sci & Technol, Sch Comp & Commun Engn, Changsha 410114, Hunan, Peoples R China.

关键词： Reliability evaluation;Multiple transient faults (MTFs);Bernoulli distribution;Fault simulation;Probability model

摘要： Radiation-induced single transient faults (STFs) are expected to evolve into multiple transient faults (MTFs) at nanoscale CMOS technology nodes. For this reason, the reliability evaluation of logic circuits in the presence of MTFs is becoming an important aspect of the design process of deep submicron and nanoscale systems. However, an accurate evaluation of the reliability of large-scale and very large-scale circuits is both very complex and time-consuming. Accordingly, this paper presents a novel soft error reliability calculation approach for logic circuits based on a probability distribution model. The correctness or incorrectness of individual logic elements are regarded as random events obeying Bernoulli distribution. Subsequently, logic element conversion-based fault simulation experiments are conducted to analyze the logical masking effects of the circuit when one logic element fails or when two elements fail simultaneously. On this basis, the reliability boundaries of the logic circuits can efficiently be calculated using the proposed probability model and fault simulation results. The proposed solution can obtain an accurate reliability range through single fault and double faults simulations with small sample sizes, and also scales well with the variation of the error rate of the circuit element. To validate the proposed approach, we have calculated the reliability boundaries of ISCAS'85, ISCAS'89, and ITC'99 benchmark circuits. Statistical analysis and experimental results demonstrate that our method is effective and scalable, while also maintaining sufficiently close accuracy.

语种： 英文

作者： Yin, Lairong;Huang, Long*;Huang, Juan*;Xu, Peng;Peng, Xuejun;...

期刊： MECHANICAL SCIENCES,2019年10(2):545-552 ISSN：2191-9151

通讯作者： Huang, Long;Huang, Juan

作者机构： [Zhang, Peng; Peng, Xuejun; Yin, Lairong; Huang, Long] Changsha Univ Sci & Technol, Sch Automot & Mech Engn, Changsha 410114, Hunan, Peoples R China.;[Huang, Juan] Hunan Agr Univ, Coll Engn, Changsha 410012, Hunan, Peoples R China.;[Xu, Peng] Hunan Changzhong Machinery Co Ltd, Changsha 410014, Hunan, Peoples R China.;[Zhang, Peng] Changsha Univ Sci & Technol, Hunan Prov Key Lab Intelligent Mfg Technol High P, Changsha 410114, Hunan, Peoples R China.

通讯机构： [Huang, Long] C;[Huang, Juan] H;Changsha Univ Sci & Technol, Sch Automot & Mech Engn, Changsha 410114, Hunan, Peoples R China.;Hunan Agr Univ, Coll Engn, Changsha 410012, Hunan, Peoples R China.

关键词： Mechanisms;Trajectories;Four-bar linkage;Four-bar mechanisms;Installation locations;Motion performance;Multiple solutions;Rectilinear trajectories;Straight-line mechanisms;Synthesis theory;Computation theory

摘要： In this paper, a synthesis method is proposed for the 5-point-contact four-bar linkage that approximates a straight line with given angle parameters. The given parameters were the angles and the location of the Ball point. Synthesis equations were derived for a general Ball-Burmester point case, the Ball-Burmester point at an inflection pole, and the Ball point that coincided with two Burmester points, resulting in three respective groups of bar linkages. Next, taking Ball-Burmester point as the coupler point, two out of the three bar-linkage combinations were used to generate three four-bar mechanisms that shared the same portion of a rectilinear trajectory. Computation examples were presented, and nine cognate straight-line mechanisms were obtained based on the Roberts-Chebyshev theory. Considering that the given parameters were angles which was arbitrarily chosen, with the other two serving as the horizontal and vertical axes, so the solution region graphs of the solutions for three mechanism configurations were plotted. Based on these graphs, the distribution of the mechanism attributes was obtained with high efficiency. By imposing constraints, the optimum mechanism solution was straightforwardly identified by the designers. For the angular parameters prescribed in this paper, the solutions for three straight-line mechanism configurations were obtained, along with nine cognate straight-line mechanisms that shared the same portion of the rectilinear trajectory. All the fixed pivot installation locations and motion performances differed, thus providing multiple solutions to the trajectory of the synthesis of mechanisms. © Author(s) 2019.

语种： 英文

作者： 黄龙;尹来容;雷兆虹;杜荣华

期刊： 教书育人(高教论坛),2019年(12):106-107 ISSN：1008-2549

作者机构： 长沙理工大学汽车与机械工程学院;[尹来容; 杜荣华; 黄龙; 雷兆虹] 长沙理工大学

关键词： 机械设计专业;思政建设;教育方式;案例实施

摘要： 在高等教育中,课堂教学环节不仅是知识传授的主要途径,也是思想政治教育的重要渠道.高校教师应当响应习总书记号召,将思想政治理论融入基础课程、专业课程的课堂教学中,提升思政教学的针对性,与思想政治理论课形成协同效应.本文结合地方高校的工科专业机械设计专业课程的教学内容,探索该类课程的思政教育方式与案例实施方法.

语种： 中文

作者： Yin, Lairong;Huang, Long*;Huang, Juan;Tian, Lei;Li, Fangyi

期刊： MECHANICAL SCIENCES,2019年10(1):25-33 ISSN：2191-9151

通讯作者： Huang, Long

作者机构： [Li, Fangyi; Tian, Lei; Yin, Lairong; Huang, Long] Changsha Univ Sci & Technol, Sch Automot & Mech Engn, Changsha 410114, Hunan, Peoples R China.;[Huang, Juan] Hunan Agr Univ, Orient Sci & Technol Coll, Changsha 410012, Hunan, Peoples R China.;[Li, Fangyi; Tian, Lei] Changsha Univ Sci & Technol, Hunan Prov Key Lab Intelligent Mfg Technol High P, Changsha 410114, Hunan, Peoples R China.

通讯机构： [Huang, Long] C;Changsha Univ Sci & Technol, Sch Automot & Mech Engn, Changsha 410114, Hunan, Peoples R China.

关键词： Analytical method;Burmester points;Different mechanisms;Four-bar linkage;Four-bar mechanisms;Infinite numbers;Initial parameter;Linkage information;Mechanisms

摘要： In this paper, we present a solution-region-based synthesis approach for selecting optimal four-bar linkages with a Ball-Burmester point. We discuss both general and special cases of the Burmester point that coincide with the Ball point at the pole of the inflection circle. Given the coordinates of one fixed joint, any point on the target's straight line, and the direction of this straight line, we can synthesize an infinite number of mechanisms using a coupler curve with five-point contacts with its tangent by adopting the proposed approach. Each initial parameter corresponds to three side links that can generate three four-bar mechanisms. We generate different mechanism property charts by developing mechanism software that enables users to intuitively identify relevant linkage information and select the optimal linkage. This novel approach is a visualized analytical method for synthesizing and selecting optimal four-bar linkages with one Ball-Burmester point on its coupler curve. © Author(s) 2019. This work is distributed under the Creative Commons Attribution 4.0 License.

语种： 英文

作者： Yin, L-R*;Wu, B-Y;Qu, H.;Zhang, J.

期刊： Lasers in Engineering,2019年44(4-6):341-353 ISSN：0898-1507

通讯作者： Yin, L-R

作者机构： [Qu, H.; Yin, L-R; Wu, B-Y] Changsha Univ Sci & Technol, Sch Automot & Mech Engn, Changsha 410114, Hunan, Peoples R China.;[Zhang, J.] Changsha Univ Sci & Technol, Hunan Prov Key Lab Intelligent Mfg Technol High P, Changsha 410114, Hunan, Peoples R China.

通讯机构： [Yin, L-R] C;Changsha Univ Sci & Technol, Sch Automot & Mech Engn, Changsha 410114, Hunan, Peoples R China.

关键词： Dual phase steel;Ductile fracture;Fiber lasers;Hardness;Martensite;Mechanical properties;Microstructure;Morphology;Shear strength;Soldered joints;Steel fibers;Welded steel structures;Welds;Yield stress;DP590;Laser lap welding;Microstructures and mechanical properties;Tempered martensite;Titanium powders;Welding joints;Welding parameters;Welding specimens;Welding

摘要： To study the microstructures and mechanical properties of the welded joints of a dual-phase (DP) steel after laser lap welding, we performed the laser lap welding and laser powder filling with titanium powder lap welding of DP590 steel using a fiber laser with optimized welding parameters. The experimental results show that the microstructures of weld seam region of DP590 steel are mainly composed of martensite. There exists a softening zone in the weld joints, which is mainly originated from the generation of tempered martensite due to the thermal effect during laser welding. The hardness and yield strength of weld seam region for the welding specimens filled with titanium powder are both decreased, while the shear strength is increased relative to the unfilled ones. Analysis of shear fracture morphology shows that the welded joints of powder filled specimen exhibit obvious ductile fracture, and they have the better toughness and ductility as compared with the unfilled ones. ©2019 Old City Publishing, Inc.

语种： 英文

作者： Liu, Xin;Fu, Qing;Ye, Nanhai*;Yin, Lairong

期刊： Structural Safety,2019年77:48-56 ISSN：0167-4730

通讯作者： Ye, Nanhai

作者机构： [Liu, Xin] Chongqing Univ, State Key Lab Mech Transmiss, Chongqing 400044, Peoples R China.;[Liu, Xin; Yin, Lairong; Fu, Qing] Changsha Univ Sci & Technol, Key Lab Safety Design & Reliabil Technol Engn Veh, Changsha 410004, Hunan, Peoples R China.;[Ye, Nanhai] Hunan Univ, State Key Lab Adv Design & Mfg Vehicle Body, Changsha 410082, Hunan, Peoples R China.

通讯机构： [Ye, Nanhai] H;Hunan Univ, State Key Lab Adv Design & Mfg Vehicle Body, Changsha 410082, Hunan, Peoples R China.

关键词： Multi-objective reliability-based design optimization;Probability model;Ellipsoidal convex model;Hybrid reliability analysis;Decoupling strategy

摘要： A multi-objective reliability-based design optimization method is proposed based on probabilistic and ellipsoidal convex hybrid model. With reliability index as the constraint, a three-layer nested multi-objective optimization problem is involved. To reduce the computation costs, an efficient decoupling strategy is presented to transform the original problem into a two-layer nested optimization problem. Then the intergeneration projection genetic algorithm and the micro multi-objective genetic algorithm are employed as inner and outer layer optimization operator to solve the multi-objective optimization problem, respectively. Finally, the present method is applied to three numerical examples and the results demonstrate the effectiveness of the present method.

语种： 英文

作者： 尹来容;张健;胡宏伟;毛聪;彭翠芳;...

期刊： 机械设计,2018年(S2):203-205 ISSN：1001-2354

作者机构： 长沙理工大学汽车与机械工程学院;[何志勇; 毛聪; 尹来容; 彭翠芳; 胡宏伟; 张健] 长沙理工大学

关键词： 机械设计;课程改革;反向设计

摘要： 根据机械设计类本科生实践课程内容与特点,对课程设计、毕业设计进行一体化反向设计,重点培养机械类本科生创新思维与解决工程问题的能力。根据CDIO与专业认证要求的"知识-能力-素质"体系,首先,整合机械原理与机械设计两门课程的课程设计,从课程理论知识体系上训练学生的创新思维与工程实践知识,其次,引入训练创新与工程实践的机械设计大作业,结合课程改革配备的专业指导教师,综合训练学生运用所学机械专业知识进行分析与解决问题的能力,进一步深入培养解决工程实际项目的能力,然后,基于课程大作业,开展机械类本科毕业选题工作。课程大作业选题来源分为学生根据自身兴趣选题、大学生科技立项、研究性学习与创新性实验项目、机械学科竞赛主题、专业指导教师横向/纵向项目等。

语种： 中文

作者： 刘鑫;付庆;尹来容;张志勇

期刊： 汽车工程,2018年40(5):521-527 ISSN：1000-680X

通讯作者： Liu, X.

作者机构： 长沙理工大学, 工程车辆安全性设计与可靠性技术湖南省重点实验室, 长沙, 410114;长安大学, 汽车运输安全保障技术交通行业重点实验室, 西安, 710064;[刘鑫] 长沙理工大学, 工程车辆安全性设计与可靠性技术湖南省重点实验室, 长沙, 410114 长安大学, 汽车运输安全保障技术交通行业重点实验室, 西安, 710064;[付庆; 尹来容; 张志勇] 长沙理工大学, 工程车辆安全性设计与可靠性技术湖南省重点实验室, 长沙, 410114

通讯机构： Changsha University of Science and Technology, Hunan Province Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle, Changsha, China

关键词： 乘员约束系统;多目标不确定性优化;局部加密;近似模型

摘要： 计及乘员约束系统不确定性参数对乘员安全性的影响,在非线性区间数规划(NINP)和局部加密近似模型相结合的基础上提出一种乘员约束系统多目标不确定性优化方法.根据实车前碰撞试验结果对乘员约束系统的数值模型进行校正,并利用区间序关系将乘员约束系统不确定性优化问题转换为确定性优化问题;采用隔代映射遗传算法(IP-GA)和微型多目标遗传算法(μMOGA)来求解满足乘员约束系统防护性能的非支配解集.结果表明:该方法能获得考虑不确定性影响的乘员约束系统最佳匹配参数,从而确保汽车乘员的安全性,在汽车安全领域具有广泛的工程应用前景.

语种： 中文

作者： Mao, Cong*;Lu, Ji;Zhao, Zhihang;Yin, Lairong;Hu, Yongle;...

期刊： Precision Engineering-Journal Of The International Societies For Precision Engineering And Nanotechnology,2018年52:170-182 ISSN：0141-6359

通讯作者： Mao, Cong

作者机构： [Hu, Yongle; Mao, Cong; Zhao, Zhihang; Lu, Ji; Yin, Lairong; Bi, Zhuming] Changsha Univ Sci & Technol, Coll Automot & Mech Engn, Changsha 410114, Hunan, Peoples R China.;[Mao, Cong] Hunan Prov Key Lab High Efficiency & Precis Machi, Xiangtan 411201, Peoples R China.;[Bi, Zhuming] Purdue Univ, Dept Civil & Mech Engn, Ft Wayne, IN 46805 USA.

通讯机构： [Mao, Cong] C;Changsha Univ Sci & Technol, Coll Automot & Mech Engn, Changsha 410114, Hunan, Peoples R China.

关键词： Single fiber;cBN-WC-10Co;Cutting characteristics;Simulation;Single grain

摘要： To explore the cutting characteristics of single fiber, the cutting process of Ti-6Al-4 V titanium alloy by single cBN-WC-10Co fiber was simulated, and the fiber size was given as 6 mm in length and 0.8 mm &times;0.8 mm in cross-section. The geometry of single fiber was modeled and the material model of Ti-6Al-4 V titanium alloy was established using the Johnson-Cook constitutive equation. The minimal thermal resistance method was combined with the specific effective thermal conductivity method to obtain the thermal conductivity of cBN-WC-10Co composites. To evaluate the grinding performance of single cBN-WC-10Co fiber, both of the comparative experiment and simulation were conducted. The simulation was used to predict the deformation and cutting temperature occurring to the workpiece, as well as the cutting force and the wear depth occurring to the single fiber. The cutting experiments were conducted on Ti-6Al-4 V titanium alloy by both of grinding tools with single fiber and single conical grain for the comparison. It was found that the cutting temperatures of single fiber were 50&ndash;100 &deg;C lower, the wear depths were 7%&ndash;15% less, and the cutting forces were 1&ndash;5 N larger than those of single grain at the same process parameters. The cutting force ratios of single fiber were much less than those of single grain. The results from the comparative experiment were aligned with the simulation results that single fiber was able to develop chips easily, while more plastic deformation occurred on the workpiece cut by single grain. This indicated that the cBN-WC-10Co fiber improved the material removal performance greatly in comparison with the CBN grain.<br/> &copy;2017 Elsevier Inc.

语种： 英文

作者： Liu, Xin;Zhang, Zhiyong*;Yin, Lairong

期刊： Mechanics Based Design of Structures and Machines,2017年45(1):25-42 ISSN：1539-7734

通讯作者： Zhang, Zhiyong

作者机构： [Liu, Xin; Yin, Lairong; Zhang, Zhiyong] Changsha Univ Sci & Technol, Educ Dept Hunan Prov, Key Lab Lightweight & Reliabil Technol Engn Vehic, Wang Jia Li South Rd 960, Changsha 410004, Hunan, Peoples R China.;[Liu, Xin] Xi An Jiao Tong Univ, State Key Lab Strength & Vibrat Mech Struct, Xian, Shanxi, Peoples R China.

通讯机构： [Zhang, Zhiyong] C;Changsha Univ Sci & Technol, Educ Dept Hunan Prov, Key Lab Lightweight & Reliabil Technol Engn Vehic, Wang Jia Li South Rd 960, Changsha 410004, Hunan, Peoples R China.

关键词： Constrained optimization;Genetic algorithms;Numerical methods;Optimization;Pareto principle;Constraint optimization problems;Intergeneration-projection genetic algorithms;Interval number programming;Micro multi-objective genetic algorithm;Pareto-optimal sets;Penalty function methods;Single objective optimization problems;Uncertainty structure;Multiobjective optimization

摘要： A multi-objective optimization method for uncertain structures is developed based on nonlinear interval number programming (NINP) method. The NINP method is employed to transform each uncertain objective function into a deterministic single-objective optimization problem. Using the constraint penalty function method, a deterministic multi-objective and non-constraint optimization problem is formulated in terms of penalty functions. Then the micro multi-objective genetic algorithm and the intergeneration projection genetic algorithm are adopted as outer layer and inner optimization operator to solve the nesting optimization problem, respectively. Finally, four numerical examples are provided to demonstrate the effectiveness of the present method. © 2017 Taylor & Francis.

语种： 英文

作者： Liu, Xin*;Kuang, Zhixiang;Yin, Lairong;Hu, Lin

期刊： Structural Safety,2017年68:73-84 ISSN：0167-4730

通讯作者： Liu, Xin

作者机构： [Hu, Lin; Liu, Xin; Yin, Lairong] Changsha Univ Sci & Technol, Key Lab Safety Design & Reliabil Technol Engn Veh, Changsha 410004, Hunan, Peoples R China.;[Liu, Xin] Changan Univ, Minist Commun, Key Lab Automot Transportat Safety Enhancement Te, Xian 710064, Shaanxi, Peoples R China.;[Kuang, Zhixiang] Hunan Inst Sci & Tech Informat, Changsha 410013, Hunan, Peoples R China.

通讯机构： [Liu, Xin] C;Changsha Univ Sci & Technol, Key Lab Safety Design & Reliabil Technol Engn Veh, Changsha 410004, Hunan, Peoples R China.

关键词： Structural uncertainty;Hybrid reliability analysis;Probability;Probability box

摘要： In many structural reliability analysis problems, probability approach is often used to quantify the uncertainty, while it needs a great amount of information to construct precise distributions of the uncertain parameters. However, in many practical engineering applications, distributions of some uncertain variables may not be precisely known due to lack of sufficient sample data. Hence, a complex hybrid reliability problem will be caused when the random and non-precise probability variables both exist in a same structure. In this paper, a new hybrid reliability analysis method is developed based on probability and probability box (p-box) models. Random distributions are used to deal with the uncertain parameters with sufficient information, while the probability box models are employed to deal with the non-precise probability variables. Due to the existence of the p-box parameters, a limit-state band will be resulted and the corresponding reliability index will belong to an interval instead of a fixed value. According to the interval analysis, the hybrid reliability model based on random and probability box variables is constructed and the complex nesting optimization problem will be involved in this hybrid reliability analysis. In order to obtain the minimal and maximal reliability index, the corresponding solution strategy is developed, in which the intergeneration projection genetic algorithm (IP-GA) with fine global convergence performance is employed as inner and outer optimization solver. Four numerical examples are investigated to demonstrate the effectiveness of the present method. (C) 2017 Elsevier Ltd. All rights reserved.

语种： 英文

作者： Liu, Xin*;Yin, Lairong;Hu, Lin;Zhang, Zhiyong

期刊： Structural and Multidisciplinary Optimization,2017年56(1):167-181 ISSN：1615-147X

通讯作者： Liu, Xin

作者机构： [Hu, Lin; Liu, Xin; Yin, Lairong; Zhang, Zhiyong] Changsha Univ Sci & Technol, Key Lab Safety Design & Reliabil Technol Engn Veh, Changsha 410004, Hunan, Peoples R China.;[Liu, Xin] Xi An Jiao Tong Univ, State Key Lab Strength & Vibrat Mech Struct, Xian 710049, Peoples R China.

通讯机构： [Liu, Xin] C;[Liu, Xin] X;Changsha Univ Sci & Technol, Key Lab Safety Design & Reliabil Technol Engn Veh, Changsha 410004, Hunan, Peoples R China.;Xi An Jiao Tong Univ, State Key Lab Strength & Vibrat Mech Struct, Xian 710049, Peoples R China.

关键词： Uncertainty structure;Reliability analysis;Probability;Probability box

摘要： In this paper, a new reliability analysis method for engineering structures is developed based on probability and probability box (p-box) models. Random variable distributions are used to deal with the uncertain parameters with sufficient information, while the p-box models are employed to deal with the uncertain-but-bounded variables. Due to the existence of the p-box parameters, a limit-state band will result and a complex nesting optimization problem will be involved in this reliability analysis. To reduce the computational burden, an efficient decoupling strategy is developed to solve the nesting optimization problem. Through interval analysis for the probability transformation process, the complex nesting optimization problem can be transformed to a single-layer optimization model. Then, the optimum solution and corresponding reliability index can be obtained by introducing a sequential quadratic programming (SQP) method. Four engineering numerical examples are investigated to demonstrate the effectiveness of the present method.

语种： 英文

作者： Zhang, J.*;Qu, H.;Yan, S.;Yin, L. R.*;Yu, X. F.;...

期刊： Journal of Materials Science,2017年52(14):8681-8689 ISSN：0022-2461

通讯作者： Zhang, J.;Yin, L. R.

作者机构： [Qu, H.; Yin, L. R.; Yan, S.; Zhang, J; Yu, X. F.; Zhang, J.] Changsha Univ Sci & Technol, Hunan Prov Key Lab Safety Design & Reliabil Techn, Changsha 410114, Hunan, Peoples R China.;[Zhou, D. W.] Hunan Univ, State Key Lab Adv Design & Mfg Vehicle Body, Changsha 410082, Hunan, Peoples R China.

通讯机构： [Zhang, J; Yin, LR] C;Changsha Univ Sci & Technol, Hunan Prov Key Lab Safety Design & Reliabil Techn, Changsha 410114, Hunan, Peoples R China.

关键词： Ball milling;Calculations;Charge transfer;Dehydrogenation;Desorption;Differential scanning calorimetry;Graphite;Hydrogen storage;Magnesium compounds;Nickel compounds;Scanning electron microscopy;Stability;X ray diffraction;First principle calculations;First-principles investigations;High-energy ball milling;Hydrogen desorption;Peak temperatures;Potential hydrogens;Structural distortions;Structural stabilities;Fluorine compounds

摘要： The high dehydrogenation temperature is still the impediment for the practical application of magnesium-based hydride (MgH2) as a potential hydrogen storage medium. In order to improve the hydrogen desorption properties of MgH2, the graphite and NiF2 are selected as additives, and the MgH2–graphite and MgH2–graphite–NiF2 composites are prepared by high-energy ball milling. Using experimental X-ray diffraction, scanning electron microscopy, differential scanning calorimetry characterizations and first-principle calculations, the effects and mechanisms of graphite and NiF2 addition on the hydrogen desorption properties of MgH2 are systematically investigated. Experimental results show that the single addition of graphite is beneficial to the refinement of MgH2 grains and particles. The size of MgH2 particles can be further decreased after the co-addition of graphite and NiF2. Either the single addition of graphite or the co-addition of graphite and NiF2 reduces the dehydrogenation temperature of MgH2. As compared with pure milled MgH2, the dehydrogenation peak temperatures are decreased by 31 and 63°C for MgH2–graphite and MgH2–graphite–NiF2 composites, respectively. Apparently, the co-addition of graphite and NiF2 exhibits the synergistic catalytic effects in improving the hydrogen desorption properties of MgH2. The first-principle calculations reveal that the co-addition of graphite and NiF2 leads to the structural distortion of MgH2 and results in the charge transfer between the additives and MgH2, which induce the weakened structural stability and decreased dehydrogenation enthalpy of MgH2. These may be the underlying reasons for the reduced dehydrogenation temperature of MgH2 with graphite and NiF2 addition. © 2017, Springer Science+Business Media New York.

语种： 英文

作者： Zhang, J.;Qu, H.;Yan, S.;Yin, L. R.*;Zhou, D. W.

期刊： Metals and Materials International,2017年23(4):831-837 ISSN：1598-9623

通讯作者： Yin, L. R.

作者机构： [Qu, H.; Yin, L. R.; Yan, S.; Zhang, J.] Changsha Univ Sci & Technol, Hunan Prov Key Lab Safety Design & Reliabil Techn, Changsha 410114, Hunan, Peoples R China.;[Zhou, D. W.] Hunan Univ, State Key Lab Adv Design & Mfg Vehicle Body, Changsha 410082, Hunan, Peoples R China.

通讯机构： [Yin, L. R.] C;Changsha Univ Sci & Technol, Hunan Prov Key Lab Safety Design & Reliabil Techn, Changsha 410114, Hunan, Peoples R China.

关键词： Ball milling;Charge transfer;Chlorine compounds;Computer simulation;Dehydrogenation;Differential scanning calorimetry;Graphene;Hydrogen storage;Interfaces (materials);Nickel compounds;Particle size analysis;Scanning electron microscopy;Stability;Thermoanalysis;Atomic configuration;Dehydrogenation properties;First principle calculations;Hydrogen absorbing material;Hydrogen storage composites;Hydrogen storage system;Mechanical alloying/milling;Structural stabilities;Magnesium compounds

摘要： The four hydrogen storage systems including pure MgH2, MgH2-5 wt%NiCl2, MgH2-10 wt%NiCl2 and MgH2-10 wt%NiCl2-10 wt%graphene were prepared by ball-milling in this work. Using experimental X-ray diffraction, scanning electron microscopy and differential scanning calorimetry testing methods in combination with first-principle calculations, the dehydrogenation properties and mechanisms of NiCl2 single-doped and NiCl2-graphene co-doped MgH2 composites were systematically investigated. Experimental results show that the NiCl2 single-doping is conductive to decreasing the size of MgH2 grains and particles. The co-doping of NiCl2 and graphene not only reduces the size of MgH2 grains and particles, but also contributes to the uniformity of MgH2 particles. As compared with milled pure MgH2, the dehydrogenation peak temperatures are decreased by 24 °C and 47 °C for the 10 wt%NiCl2 single-doped and 10 wt%NiCl2-10 wt%graphene co-doped MgH2 systems, respectively. It is demonstrated that the co-doping of NiCl2 and graphene exhibits the synergistic effects of confinement and catalysis on improving the dehydrogenation properties of MgH2. The first-principle calculations indicate that the co-doping of NiCl2 and graphene leads to the distortion of MgH2 atomic-configuration and results in the charge transfer between the dopants and MgH2, which induce the weakened structural stability and decreased dehydrogenation enthalpy of MgH2. © 2017, The Korean Institute of Metals and Materials and Springer Science+Business Media B.V.

语种： 英文

作者： Mao, Cong;Zhou, Xin;Yin, Lairong*;Zhang, Mingjun;Tang, Kun;...

期刊： International Journal of Advanced Manufacturing Technology,2016年85(1-4):291-298 ISSN：0268-3768

通讯作者： Yin, Lairong

作者机构： [Zhang, Jian; Zhang, Mingjun; Mao, Cong; Tang, Kun; Zhou, Xin; Yin, Lairong] Changsha Univ Sci & Technol, Coll Automot & Mech Engn, Changsha 410114, Hunan, Peoples R China.;[Zhang, Jian; Zhang, Mingjun; Mao, Cong; Tang, Kun; Zhou, Xin; Yin, Lairong] Hunan Prov Key Lab Safety Design & Reliabil Techn, Changsha 410114, Hunan, Peoples R China.

通讯机构： [Yin, Lairong] C;[Yin, Lairong] H;Changsha Univ Sci & Technol, Coll Automot & Mech Engn, Changsha 410114, Hunan, Peoples R China.;Hunan Prov Key Lab Safety Design & Reliabil Techn, Changsha 410114, Hunan, Peoples R China.

关键词： Nozzle;Simulation;Flow field;Grinding;Minimum quantity lubrication

摘要： Efficient application of minimum quantity lubrication (MQL) in grinding is not only related to grinding conditions and delivery parameters but also affected by spraying atomization characteristics. In this study, a double-outlet nozzle is proposed and the flow field of the MQL grinding is investigated by two-stage atomization model. The side-mixing structure of double-outlet nozzle indicates that the grinding fluid is atomized at the windward side and the flow rate of grinding fluid for a single radial hole is smaller than that for the liquid pipe. Therefore, more excellent atomization performances, in terms of liquid droplet size, uniformity, and velocity of the liquid droplets, are obtained for double-outlet nozzle in comparison with single-outlet nozzle. The liquid droplets sprayed from auxiliary outlet of double-outlet nozzle impact on the grinding wheel and change the airflow direction around the grinding wheel. Thus, the air barrier around the grinding wheel is disturbed and the liquid droplets sprayed from main outlet can be injected into the grinding zone easily. Experimental results indicate that two-stage atomization model is reliable.

语种： 英文

作者： Wu, Gang;Zhang, Jian*;Li, Yuelin;Yin, Lairong;Liu, Zhiqiang

期刊： INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS,2016年13(5):1650023 ISSN：0219-8762

通讯作者： Zhang, Jian

作者机构： [Li, Yuelin; Zhang, Jian; Yin, Lairong; Wu, Gang; Liu, Zhiqiang] Changsha Univ Sci & Technol, Sch Automot & Mech Engn, South Wanjiali Rd, Changsha 410114, Hunan, Peoples R China.;[Wu, Gang] Coll Hunan Prov, Key Lab Efficient & Clean Energy Utilizat, South Wanjiali Rd, Changsha 410114, Hunan, Peoples R China.

通讯机构： [Zhang, Jian] C;Changsha Univ Sci & Technol, Sch Automot & Mech Engn, South Wanjiali Rd, Changsha 410114, Hunan, Peoples R China.

关键词： Cells;Computational mechanics;Cytology;Delta functions;Galerkin methods;Heat transfer;Interpolation;Numerical methods;Stresses;Thermoelasticity;Convergence rates;Displacement and stress fields;Kronecker delta functions;Mechanical problems;Mesh-free method;Radial point interpolation method;thermo-elastic;Transient heat transfer;Convergence of numerical methods

摘要： The transient thermo-elastic problems are solved by a cell-based smoothed radial point interpolation method (CS-RPIM). For this method, the problem domain is first discretized using triangular cells, and each cell is further divided into smoothing cells. The field functions are approximated using RPIM shape functions which have Kronecker delta function property. The system equations are derived using the generalized smoothed Galerkin (GS-Galerkin) weak form. At first, the temperature field is acquired by solving the transient heat transfer problem and it is then employed as an input for the mechanical problem to calculate the displacement and stress fields. Several numerical examples with different kinds of boundary conditions are investigated to verify the accuracy, convergence rate and stability of the present method. © 2016 World Scientific Publishing Company.

语种： 英文

作者： 尹来容;杜荣华;吴茵;毛聪;雷兆虹;...

作者机构： [尹来容; 杜荣华; 吴茵; 毛聪; 雷兆虹; 刘鑫] 长沙理工大学汽车与机械工程学院

会议名称： 2016’第十五届全国机械设计教学研讨会

会议时间： 2016-07-01

会议地点： 北京

会议论文集名称： 2016’第十五届全国机械设计教学研讨会 论文集

关键词： 机械设计;课程改革;工程实践;反向设计

摘要： 根据机械原理与机械设计课程内容与特点,对机械原理与机械设计课程进行一体化反向设计,重点培养本科生创新意识与工程实践能力。根据国际工程教育专业认证要求的"知识一能力一素质"培养体系,首先,整合机械原理与机械设计现有的课程体系,训练学生的创新意识与工程实践所需的基础理论知识;其次,重构实验教学环节,锻炼学生的实际操作与实践探索能力;然后,引入创新与工程实践大作业,结合指导教师工程项目,训练学生运用所学

语种： 中文