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Assessing Method of Motif for Surface Topography and Its Algorithm of Realization

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Assessing Method of Motif for Surface Topography and Its Alg...

第三届国际仪器科学技术学术研讨会

作者： YANG Lian-gen a WANG Sheng-huai a SHEN bang-xing a xie tie-bang b aschool of mechanical engineering Hubei Polytechnic University Wuhan 430068 China bSchool of mechanical Science and engineering Huazhong University of Science and Technology Wuhan 430074 China

Motif method is a new important assessing method of surface topography. Firstly,the basic concept, basic characterization parameters, essential combination conditions, and elementary calculation proce

关键词： surface roughness surface waviness Motif parameter symbol bit combination algorithm

PROPULSIVE PERFORMANCE AND VORTEX SHEDDING OF A FOIL IN FLAPPING MOTION

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Journal of Hydrodynamics 2003年第5期15卷 7-12页

作者： Yang Yan, Lu Xi yun, Yin xie zhen Department of Mechanics and mechanical engineering, University of Science and Technology of China, Hefei 230026, China, Dept. of Mech. and Mech. Eng. Univ. of Sci. and Technol. of China Hefei 230026 China

The propulsive performance and vortex shedding of oscillating foil, whichmimics biological locomotion, were numerically investigated. The objectives of this study were todeal with unsteady force, in particular thrust force, exerted on the foil in pitching and plungingmotions, and to explore the relation of the propulsive performance with vortex structures near thefoil and vortex shedding in the near wake. The two-dimensional incompressible Navier-Stokesequations in the vorticity and stream-function formulation were solved by fourth-order essentiallycompact finite difference schemes for the space derivatives and a fourth-order Runge-Kutta schemefor the time advancement. To reveal the mechanism of the propulsive performance, the unsteady forceand the shedding of the trailing- and leading-edge vortices of the foil were analyzed. The effectsof some typical factors, such as the frequency and amplitude of the oscillation, the phasedifference between the pitching and plunging motions, and the thickness ratio of the foil, on thevortex shedding and unsteady force were discussed.

关键词： vortex dynamics vortex shedding thrust force unsteady flow flappingmotion

Advances in Graphene‑based Electrode for Triboelectric Nanogenerator

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Nano-Micro Letters 2025年第1期17卷 378-403页

作者： bin xie Yuanhui Guo Yun Chen Hao Zhang Jiawei Xiao Maoxiang Hou Huilong Liu Li Ma Xin Chen Chingping Wong State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment Guangdong University of TechnologyGuangzhou 510006People’s Republic of China School of Electromechanical engineering Guangdong University of TechnologyGuangzhou 510006People’s Republic of China School of Materials Science and engineering Georgia Institute of TechnologyAtlantaGA 30332USA

With the continuous development of wearable electronics,wireless sensor networks and other micro-electronic devices,there is an increasingly urgent need for miniature,flexible and efficient nanopower generation *** nanogenerator(TENG)technology can convert small mechanical energy into electricity,which is expected to address this *** the core component of TENG,the choice of electrode materials significantly affects its *** metal electrode materials often suffer from problems such as durability,which limits the further application of ***,as a novel electrode material,shows excellent prospects for application in TENG owing to its unique structure and excellent electrical *** review systematically summarizes the recent research progress and application prospects of TENGs based on graphene *** precision processing methods of graphene electrodes are introduced,and the applications of graphene electrode-based TENGs in various scenarios as well as the enhancement of graphene electrodes for TENG performance are *** addition,the future development of graphene electrode-based TENGs is also prospectively discussed,aiming to promote the continuous advancement of graphene electrode-based TENGs.

关键词： Triboelectric nanogenerator Precision processing Graphene electrode Self-powered sensor

Abnormal Twinning behavior and Constitutive Modeling of a Fine-Grained Extruded Mg-8.0Al-0.1Mn-2.0Ca Alloy under High-Speed Impact along Various Directions

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Acta Metallurgica Sinica(English Letters) 2023年第2期36卷 281-294页

作者： Fei-Yang Chen Peng-Cheng Guo Zi-Han Jiang Xiao Liu tie-Jun Song Chao xie College of mechanical and Electrical engineering Central South University of Forestry and TechnologyChangsha410004China College of mechanical engineering and Mechanics Ningbo UniversityNingbo315211China College of mechanical engineering Xiangtan UniversityXiangtan411105China College of Material Science and engineering Hunan University of Science and TechnologyXiangtan411201China

To understand the mechanical and twinning behaviors of a fine-grained extruded Mg-8.0Al-0.1Mn-2.0Ca alloy under high-speed impact,impact tests were carried out using a split Hopkinson pressure bar,and microstructures at strains of 0.05,0.10 and 0.20 were obtained using a series of stop rings manufactured by high-strength *** stress response and twinning behavior are closely related to loading direction and applied strain *** true stress-true strain curves are s-shaped in extrusion direction(ED)and c-shaped in transverse direction(TD),showing apparent anisotropy,while the yield strength is insensitive to loading *** identical strain-rate sensitivity is demonstrated by the stress in ED and ***,de-twinning is apparent as the applied strain increases to 0.20,and it is enhanced with increasing the applied strain *** contrast,the twin density in ED samples is clearly higher than that in TD *** modifying the terms of strain hardening and strain rate hardening in the classical JC model,an optimized model is built,which can accurately predict the stress response behavior of the studied alloy under high-speed impact along ED and *** correlation coefficient(R)and average absolute relative error(AARE)are 98.63%and 0.0199 for ED,and 96.88%and 0.0202 for TD,respectively.

关键词： High-speed impact Magnesium alloy Twinning behavior Constitutive model Anisotropy

mechanical characteristics of composite honeycomb sandwichstructures under oblique impact

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Theoretical & Applied Mechanics Letters 2022年第5期12卷 359-370页

作者： Yuechen Duan Zhen Cui Xin xie Ying tie Ting Zou Tingting Wang School of mechanical and Power engineering Zhengzhou UniversityZhengzhou 450001China Department of mechanical engineering Memorial University of NewfoundlandSt.John’s A1B 3X5Canada

Carbon fiber reinforced polymer(CFRP)and CFRP-based composite honeycomb sandwich structures are particularly sensitive to *** mechanical characteristics of composite honeycomb sandwich structures under oblique impact are studied by numerical simulation and *** oblique impact model is established,and the reliability of the model is verified by the oblique impact *** further analyze the influence of structural parameters on energy absorption under oblique impact,the influence of impact angle,face sheet thickness and wall thickness of the honeycomb is numerically *** results show that the impact angle has an important effect on energy *** structural parameters also have an effect on the peak contact force,contact time,and energy absorption,and the effect is different from normal impact due to the presence of frictional dissipation *** with normal impact,the debonding of oblique impact will be reduced,but the buckling range of the honeycomb core will be expanded.

关键词： Composite sandwich structures Honeycomb Oblique impact mechanical characteristics Energy absorption

Dynamic Weighing Technology Combining Parameter Identification

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Dynamic Weighing Technology Combining Parameter Identificati...

第三届国际仪器科学技术学术研讨会

作者： GAO Zong-hai a MAO Jian-dong b aschool of mechanical & Instrumental engineering Xi’an University of Technology Xi’an 710048 China bDepartment of Electronic & Information engineering The Second Northwest University For Minorities Yinchuan 750021 China

In dynamic weighing system, in order to consider the speed and precision simultaneously when measureing, the problem of dynamic weighing is resolved through parameter identification based on least squ

关键词： dynamic weighing parameter identification Householder transformation least square method

Dynamic Characteristics of Touch-trigger Probe

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Dynamic Characteristics of Touch-trigger Probe

第三届国际仪器科学技术学术研讨会

作者： FEI Ye-tai a ZHAO Jing a CHEN Wei-fang b LIN Shen-wang b aschool of Instrumentation Hefei University of Technology Anhui China bDepartment of mechanical engineering Far East Institute of Technology Tainan China

Coordinate Measuring Machine (CMMs) are widely used in modern manufacturing industry. Fast probing now is a new trend for next generation CMMs. However, as the speed of CMMs increases, dynamic errors

关键词： Coordinate Measuring Machine (CMM) Touch-trigger probe Pre-travel Neural Network (NN)

Diffusion behavior of Cr in gradient nanolaminated surface layer on an interstitial-free steel

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Journal of Materials Science & Technology 2019年第3期35卷 460-464页

作者： S.L.xie Z.b.Wang K.Lu Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences School of Materials Science and engineering University of Science and Technology of China

Nanolaminated structures composed of low-angle grain boundaries(LAGbs) possess high thermal stability. In this paper, a gradient nanolaminated(GNL) surface layer with smooth finish was fabricated on an interstitial-free steel by means of surface mechanical rolling treatment. Microstructural observations demonstrated that the average lamellar thickness is about 80 nm in the topmost surface layer and increases with increasing depth. High thermal stability was confirmed in the GNL surface layer after annealing at 500℃. Diffusion measurements showed that effective diffusivity of Cr in GNL layer is 4–6 orders of magnitude higher than lattice diffusivity within the temperature range from 400 to 500℃. This might be attributed to numerous LAGbs or dislocation structures with a higher energy state in the GNL surface layer. This work demonstrates the possibility to advanced chromizing(or other surface alloying)processes of steels with formation of GNL surface layer, so that a thicker alloyed surface layer with a stable nanostructure is achieved.

关键词： Gradient nanolaminated structure Interstitial-free steel Diffusion Low-angle grain boundary Surface mechanical rolling treatment

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一种基于最优控制的车队协作算法

上海交通大学学报 2011年第7期45卷 949-953页

作者：谢强德杨明王冰王春香上海交通大学电子信息与电气工程学院上海200240 上海交通大学机械与动力工程学院上海200240

为缩短车队通过路口的时间,提出了一种基于最优控制的车队协作算法.首先,根据车辆运动的物理关系构建车队模型,并利用包含原理对其进行分解,获得车队系统的扩展模型.然后,使用最优输出跟踪控制算法,并根据车队安全性要求求取算法中的权... 详细信息

为缩短车队通过路口的时间,提出了一种基于最优控制的车队协作算法.首先,根据车辆运动的物理关系构建车队模型,并利用包含原理对其进行分解,获得车队系统的扩展模型.然后,使用最优输出跟踪控制算法,并根据车队安全性要求求取算法中的权重矩阵,得到车队系统的最优控制率.最后,通过收缩原系统获得车队的次优控制率.该方法可以在保证车辆安全行驶情况下,使车队能尽快达到目标巡航速度,从而快速通过路口.仿真和实际实验结果证明了该方法的有效性.

关键词：最优控制车队重叠结构分解仿真