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Experimental-based study of gear vibration characteristics incorporating the fractal topography of tooth surface

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International Journal of Mechanical System Dynamics 2023年第2期3卷 173-182页

作者： Qi'ao lei lei Yuan Xin Yu Yunyun Sun Hongguang Li School of Power and Mechanical Engineering Wuhan UniversityWuhanHubei ProvinceChina State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong UniversityShanghaiChina

Microscopic roughness is inevitable on the gear meshing surface,which is also a key parameter affecting the dynamic *** surface roughness exhibits self‐affine characteristics across *** explore the influence of surface fractal topography on the vibration amplitude of the gear system under different rotational speeds and loads,an experimental setup of spur gear transmission is *** fractal dimension and fractal roughness of the meshing surface are calculated by the power spectral density *** relationships between gear response and fractal parameters are revealed *** indicate that a rougher tooth surface,that is,a smaller fractal dimension or larger fractal roughness,corresponds to an intense vibration *** sensitivity of dynamic response to the tooth surface topography varies at different rotational speeds and *** low speed and light load conditions,the fractal dimension and fractal roughness have a more obvious influence on the dynamic response of the gear transmission *** the increase of speed and load,the macroworking conditions gradually become the main factor attributed to vibration amplitude.

关键词： spur gear fractal roughness vibration amplitude surface morphology

Real-time predictive sliding mode control method for AGV with actuator delay

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Advances in Manufacturing 2019年第4期7卷 448-459页

作者： Zhi Chen Jian Fu Xiao-Wei Tu ao-lei Yang Min-Rui Fei School of Mechatronic Engineering and Automation Shanghai UniversityShanghai 200444People's Republic of China College of Energy and Power Engineering Nanjing University of Science and TechnologyNanjing 210094People's Republic of China

In this paper,a predictive sliding mode control method based on multi-sensor fusion is proposed to solve the problem of insufficient accuracy in trajectory tracking caused by actuator *** controller,based on the kinematics model,uses an inner and outer two-layer structure to achieve decoupling of position control and heading control.A reference positional change rate is introduced into the design of controller,making the automatic guided vehicle(AGV)capable of real-time predictive control ability.A stability analysis and a proof of predictive sliding mode control theory are *** experimental results show that the new control algorithm can improve the performance of the AGV controller by referring to the positional change rate,thereby improving the AGV operation without derailing.

关键词： Predictive sliding mode control-Multi-sensor fusion Trajectory tracking Real-time decoupling

Multiple Robots Formation Manoeuvring and Collision Avoidance Strategy

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International Journal of Automation and computing 2017年第6期14卷 696-705页

作者： ao-lei Yang Wasif Naeem Min-Rui Fei Li Liu Xiao-Wei Tu Shanghai Key Laboratory of Power Station Automation Technology School of Mechatronic Engineering and AutomationShanghai University School of Electronics Electrical Engineering and Computer Science Queen's University Belfast

This paper presents a multiple robots formation manoeuvring and its collision avoidance strategy. The direction priority sequential selection algorithm is employed to achieve the raw path, and a new algorithm is then proposed to calculate the turning-compliant waypoints supporting the multi-robot formation manoeuvre. The collision avoidance strategy based on the formation control is presented to translate the collision avoidance problem into the stability problem of the formation. The extension-decomposition-aggregation scheme is next applied to solve the formation control problem and subsequently achieve the collision avoidance during the formation manoeuvre. Simulation study finally shows that the collision avoidance problem can be conveniently solved if the stability of the constructed formation including unidentified objects can be satisfied.

关键词： Path planning formation control manoeuvring waypoints line-of-sight collision avoidance

Advances on supramolecular assembly of cyclometalated platinum(Ⅱ) complexes

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Chinese Chemical Letters 2016年第8期27卷 1147-1154,1465页

作者： Teng-Fei Fu lei ao Zong-Chun Gao Xiao-Long Zhang Feng Wang CAS Key Laboratory of Soft Matter Chemistry iChEM (Collaborative Innovation Center of Chemistry for Energy Materials) Department of Polymer Science and Engineering University of Science and Technology of China Hefei Anhui 230026 China

Organoplatinum（Ⅱ） compounds have received enormous attention over the past decades due to their square-planar geometry as well as intriguing photo-physical ***-assembly has emerged as an excellent approach to create well-ordered supramolecular architectures with tunable properties,which underpin the role of solvent-directed approach for the design of functional *** this minireview,the recent advances on supramolecular self-assembly of cyclometalated platinum（Ⅱ） complexes have been *** the self-assembly process,non-covalent Pt-Pt and π-π interactions play crucial roles in controlling the structures and functions of the resulting assemblies.

关键词： Self-assembly Supramolecular chemistry Cyclometalated platinum(Ⅱ) complexes Metal-metal interactions

Double regularization control based on level set evolution for tablet packaging image segmentation

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Advances in Manufacturing 2015年第1期3卷 73-83页

作者： Li Liu ao-lei Yang Xiao-Wei Tu Wen-Ju Zhou Min-Rui Fei Jun Yue Shanghai Key Laboratory of Power Station Automation Technology School of Mechatronic Engineering and AutomationShanghai University School of Information Science and Electrical Engineering Ludong University School of Computer Science and Electronic Engineering University of Essex.Colchester CO4 3SQUK

This paper proposes a novel double regular- ization control （DRC） method which is used for tablet packaging image segmentation. Since the intensities of tablet packaging images are inhomogenous, it is difficult to make image segmentation. Compared to methods based on level set, the proposed DRC method has some advantages for tablet packaging image segmentation. The local re- gional control term and the rectangle initialization contour are first employed in this method to quickly segment un- even grayscale images and accelerate the curve evolution rate. Gaussian filter operator and the convolution calcula- tion are then adopted to remove the effects of texture noises in image segmentation. The developed penalty energy function, as regularization term, increases the constrained conditions based on the gradient flow conditions. Since the potential function is embedded into the level set of evo- lution equations and the image contour evolutions are bi- laterally extended, the proposed method further improves the accuracy of image contours. Experimental studies show that the DRC method greatly improves the computational efficiency and numerical accuracy, and achieves better results for image contour segmentation compared to other level set methods.

关键词： Tablet packaging image . Level setevolution - Image segmentation - Curvatures . Doubleregularization control (DRC)

Synthesis and Biological Evaluation of Pyranone Analogues of Territrem B

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Chinese Chemical Letters 2005年第9期16卷 1189-1192页

作者： Xiang Rui JIANG lei ao Chang Xin ZHOU lei Xiang YANG Hai Bo LI Xiu Mei WU Hua BAI Qi Jun ZHANG Yu ZHao Department of Traditional Chinese Medicine and Natural Drug Research. College of Pharmaceutical Sciences Zhejiang University Hangzhou 310031 Zhejiang Hisun Naturelite Pharmaceutical R＆D Co. Ltd. Hangzhou 310006

23 compounds containing pyranone pharmacophore of territrem B were designed and synthesized. Some of the analogues showed IC50 values of AChE inhibition at 10^-5 mol/L.

关键词： 2H-Pyran-2-one territrim B synthesis AChE inhibitor.

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多个柔性梁V型集群行为节能机理研究

力学学报 2022年第6期54卷 1706-1719,I0005页

作者：张磊敖雷裴志勇武汉理工大学绿色智能江海直达船舶与邮轮游艇研究中心武汉430063 绿色智能江海直达船舶湖北省工程研究中心武汉430063

V型排列是自然界中常见的动物(如大雁等迁徙性鸟类)集群模式,普遍推测该模式可以有效地降低能耗,然而目前没有研究给出相关的直接数据证据.开展其节能机理研究有助于提升对集群自然现象的认知水平,为集群仿生应用打下基础.本文采用基于F... 详细信息

V型排列是自然界中常见的动物(如大雁等迁徙性鸟类)集群模式,普遍推测该模式可以有效地降低能耗,然而目前没有研究给出相关的直接数据证据.开展其节能机理研究有助于提升对集群自然现象的认知水平,为集群仿生应用打下基础.本文采用基于Fluent二次开发的数值方法求解多个柔性体−流体介质相互作用的流固耦合问题,其中流体动力学方程采用有限体积法进行求解,柔性体动力学控制方程通过用户自定义模块(UDF)嵌入,并采用模态叠加法和4阶龙格库塔法求解,流固交界面形变使用动网格技术处理.实现了多个自推进二维柔性梁自主形成V型集群运动过程的数值模拟,并将得到的推进性能参数(平均速度,输入功率和效率)与单独自推进柔性体的数据进行对比.研究发现:该V型集群运动中不仅后排柔性梁的速度和推进效率得到提升,领头柔性梁性能也得到大幅提升,增幅均超过14%.此外,对V型集群运动的流场细节(涡量和压力云图)开展分析,揭示了多柔性梁V型集群行为产生的原因和节能的内在机理,特别是对领头柔性梁的节能机理进行了阐述.

关键词：集群行为计算流体力学流固耦合数值模拟节能

选举法修改的成果与缺憾——从王春立案件和梁广镇事件谈起

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烟台大学学报（哲学社会科学版） 2010年第4期23卷 41-46,63页

作者：秦奥蕾中国政法大学法学院北京100088

"王春立等诉民族饭店案"与"梁广镇身兼两地人大代表事件"是有关我国选举制度与选举法适用的比较典型的案件。两起案件明显反映出在救济公民政治权利、选举中的选民登记程序、对人大代表提名候选人的监督方面,原选举法的规定存在不足。... 详细信息

"王春立等诉民族饭店案"与"梁广镇身兼两地人大代表事件"是有关我国选举制度与选举法适用的比较典型的案件。两起案件明显反映出在救济公民政治权利、选举中的选民登记程序、对人大代表提名候选人的监督方面,原选举法的规定存在不足。本次选举法修改回应社会现实问题,在选举服务机构、禁止人大代表两地兼职、代表身份的真实公开等方面作出相应规定,部分解决了两起案件中存在的问题,但在如何救济公民政治权利等方面未作改善,解决这些问题应成为未来选举法修改的方向。

关键词：选举法修改公民政治权利选举服务机构王春立案梁广镇事件

Changes of histology and capsular collagen in a rat shoulder immobilization model

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Chinese Medical Journal 2011年第23期124卷 3939-3944页

作者： LIU Yu-lei ao Ying-fang CUI Guo-qing ZHU Jing-xian Institute of Sports Medicine Peking University Third Hospital Beijing 100191 China

Shoulder immobilization can induce adhesion of the joint, capsular contracture or lead to the condition of frozen shoulder. However, little is known about the histological effects of immobilization on the shoulder joint. This study aimed to explore the effect of immobility on the subscapular bursa （SSB） and the joint capsular content, including the distribution of typesⅠ and Ⅲcollagen, within an immobilized rat shoulder. Methods Forty-six Sprague-Dawley rats were randomly divided into one control group （n=6） and four immobilization groups （n=10 in each group）, in which the left shoulders were immobilized with plaster for 1,2, 3 and 4 weeks. At the end of each time point, 2 rats from each group were euthanized and shoulders prepared for serial histological observations of the glenohumeral joints, as well as picrosirius red and immunohistochemical observation of type Ⅲcollagen. Histological sections of the remaining rat shoulders were used for the immunohistochemical detection of the capsular content of types Ⅰand Ⅲcollagen. Results The hyperplastic synovium of the anterior capsule obstructed the communication between the SSB and the glenohumeral joint cavity at 2 and 3 weeks. The adhesion of the SSB appeared at 3 and 4 weeks. The quantitative and qualitative results showed that the capsular contents of types Ⅰand Ⅲcollagen progressively increased at 2, 3 and 4 weeks, and that type Ⅲcollagen was distributed extensively within the joint capsule at 2 and 3 weeks. Conclusion Immobilization of the rat shoulder induced synovial hyperplasia of the joint capsule, adhesion of the SSB and an increase of the capsular content of types Ⅰ and Ⅲcollagen.

关键词： immobilization glenohumeral joint subscapular bursa frozen shoulder