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第八届国际振动工程会议

作者： Sanya Chen Wenhua Hu Yalu Zhao Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical EngineeringTianjin University of Technology National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology

The variable configuration of the folding wings is beneficial to take into account the maneuverability and endurance of the aircraft. During the flight, the elastic deformation and folding motion of the folding wing will induce additional aerodynamic forces, which will produce new deformation and new aerodynamic forces on the wing structure, and this reciprocal coupling will make the folding wing response may tend to diverge and lead to structural damage. In this paper,the principle of geometric similarity is used to simplify the folding wing into a folding plate and study its rigid-flexible aerodynamic coupling dynamics, which has certain practical significance as well as the theoretical value.

关键词： Rigid-flexible and Fluid-structure Coupling Dynamics of Folding Plate

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Orthogonal Experiment for Desalination Efficiency of Electromagnetic Desalination system

Orthogonal Experiment for Desalination Efficiency of Electro...

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2019 International Conference on Energy, Power, Environment and Computer Application(ICEPECA 2019)

作者： He TIAN Lu DANG Shi-min ZHOU Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology

Electromagnetic desalination system is designed by coupling effect of electric field and magnetic field. By designing the L27(313) orthogonal table as the experimental scheme, the electromagnetic desalination efficiency is used as the data of the range R analysis. The main and secondary factors influencing desalination efficiency are as follows: initial seawater concentration(F)>influent flow(G)>interaction of adsorption voltage(D) and magnetic field(E)> interaction of activated carbon pore size(A) and substrate material(B)>interaction of activated carbon pore size(A) and adsorption voltage(D)> adsorption voltage(D)>magnetic field(E)>number of electrodes(E)>substrate material(B)>activated carbon pore size(A).The best combination of seawater desalination is A2B2C1D3E3F1G2. The range R of factor F is 20.53, which indicates that the initial seawater concentration has a highly significant influence on the desalination effect of seawater.

关键词： Desalination system Orthogonal Experimental Design Seawater Desalination Efficiency Influence Factors

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The effective thermal conductivity of a screen-printed thermoelectric film of Bi 2 Te 3 and CsSnI 3

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International Journal of Heat and Mass Transfer 2025年 250卷

作者： Koji Miyazaki Anjum Mustafa Ajay Kumar Baranwal Shrikant Saini Kosuke Watanabe Asuka Miura Tomohide Yabuki Manabu Ishimaru Shoya Kawano Qing Wang Satoshi Iikubo Qing Shen Shuzi Hayase Department of Mechanical Engineering Kyushu University 744 Motooka Nishi-ku Fukuoka Fukuoka 819-0395 Japan Department of Mechanical and Control Engineering Kyushu Institute of Technology 1-1 Sensui-cho Tobata-ku Kitakyushu Fukuoka 804-8550 Japan Department of Electronics & Communication Engineering Madan Mohan Malaviya University of Technology Gorakhpur Uttar Pradesh 273010 India Department of Creative Engineering National Institute of Technology Kitakyushu College 5-20-1 Shii Kokuraminami-ku Kitakyushu Fukuoka 802-0985 Japan Department of Materials Science and Engineering Kyushu Institute of Technology 1-1 Sensui-cho Tobata-ku Kitakyushu Fukuoka 804-8550 Japan Department of Electronic Engineering Kyushu Institute of Technology 1-1 Sensui-cho Tobata-ku Kitakyushu Fukuoka 804-8550 Japan Department of Advanced Materials Science and Engineering Kyushu University 6-1 Kasuga-koen Kasuga Fukuoka 816-8580 Japan i-Powered Energy System Research Center (i-PERC) The University of Electro-Communications

In recent years, printed thermoelectric thin films have attracted attention due to their advantages in enabling large-area and flexible designs. We developed printable thermoelectric composites of bismuth telluride and halide perovskite, which were expected to exhibit superior thermoelectric properties compared to other printable materials, such as conductive organic materials. The measured dimensionless figure of merit was about 0.1 at room temperature due to its low thermal conductivity. We assessed the interfacial thermal resistance between bismuth telluride and halide perovskite using multilayered films to understand the measured low thermal conductivity. The calculated thermal conductivity using the measured interfacial thermal resistance was fairly consistent with the effective thermal conductivity observed. We also discussed the interfacial thermal resistance using a phonon transport model based on ab-initio calculations to confirm the validity of our measurements. Additionally, we found that the high interfacial thermal resistance was achieved due to the low group velocities of both materials in the composites. This mechanism can be applied not only to improve thermoelectric materials but also to address thermal issues in composites.

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Significant Wave Height Prediction Based on VMD-SA-MLP-BP

Significant Wave Height Prediction Based on VMD-SA-MLP-BP

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2023 China Automation Congress, CAC 2023

作者： Wu, Yining Zhang, Runfeng Liu, Fang Liu, Zhenzhong Wu, Jianguo Dong, Haonan School of Mechanical Engineering Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control Tianjin University of Technology Tianjin300384 China Tianjin University of Technology National Demonstration Center for Experimental Mechanical and Electrical Engineering Education China Yichang Research Institute of Testing Technology Yichang443003 China Tianjin Hanhailanfan Marine Technology Co. Ltd. Tianjin300457 China School of Computer Science and Engineering Tianjin University of Technology Tianjin300384 China

ISBN: (纸本)9798350303759

Waves seriously impact port construction, worldwide route planning, military activities, and wave power generation. To improve the accuracy of significant wave height prediction, we proposed a novel prediction method, a multi-layer perceptron combined with a backpropagation adjustment (MLP-BP) prediction model that combines mutation mode decomposition (VMD) and a simulated annealing optimization algorithm (SA). Firstly, we use the variable modulus method to decompose the significant wave height sequence data and transform the wave height sequence into multiple different sub-modes (IMF) to reduce the complexity and non-stationarity of the data. Secondly, the simulated annealing algorithm (SA) is used to optimize the weight and bias of the MLP-BP neural network to find the optimal parameter configuration and improve the performance and generalization ability of the prediction model. Finally, the decomposed sub-modal components of each significant wave height sequence are inserted into the MLP-BP neural network and the predicted values of each element are summed to obtain the final significant wave height prediction. The prediction results of the SSA-MLP-BP, PSO-MLP-BP, SA-MLP-BP, and VMD-SA-MLP-BP were compared and demonstrated that the VMD-SA-MLP-BP model performed best. The MAE, MAPE, MSE, RMSE, and R2 of the prediction evaluation indexes were 0.036 m, 11.7%, 0.004 m2, 0.067 m, and 0.983, respectively, which performed well in predicting significant wave height. © 2023 IEEE.

关键词： Variational mode decomposition

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Study on design method for dynamics of machine tools based on advanced process system

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Paper Asia 2018年第4期COMPENDIUM VOL. 1卷 102-105页

作者： Zhu, Peihao Li, Xiang Lu, KaiJie Zheng, QingChun Liu, JingNa Ma, WenPeng Hu, YaHui Yu, YangBin Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology Tianjin300384 China

Machining accuracy depends not only the manufacturing error, thermal deformation, elastic deformation and wear but also the vibration produced by it. Establishing the dynamics model provides the basis of dynamic analysis. The most common dynamic models of machine tool are finite element model, lumped parameter model, distributed mass model and parameters identification. Above methods are applied by using the methods of multi-body dynamics, finite element and the progress of technology. Design is finite optimization based on dynamic analysis to get limited improvements for existing empirical design. It is not possible to design the machine tool as required to achieve the expected dynamic performance. In order to comply with precision machine tool’s development demand and the challenge of machine structure design, This paper presents physical and dynamic models considering Machine-Tool-Workpiece Process system to discusses the dynamic cutting process of the dynamic cutting load, driving and executing devices under the excitations of non-equilibrium inertial load. The dynamic of machine tool is mapped to the relative displacement of tool nose. © 2018, SHPMedia Sdn Bhd. All rights reserved.

关键词： Dynamic models

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Optimal Design of High Power LED Lamp Heat Dissipation Based on Equivalent Thermal Circuit Method

Optimal Design of High Power LED Lamp Heat Dissipation Based...

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2015 5th International Conference on Computer Sciences and Automation engineering(ICCSAE 2015)

作者： Feng Liang Lianyu Zhao Youjun Yue Zhuoyin Tong Lizhu Wang School of mechanical engineering Tianjin University of Technology Tianjin Key Laboratory of the Design and Intelligent Control of the Advanced Mechatronical System School of automation Tianjin University of Technology

Since the heat dissipation problemis harsh in high power LED lamp, in our studywe suggest an optimal design method of high-power LED lamps radiator based on the equivalent thermal circuit method, we abstract mathematical model of the heat dissipation system of the lamps, then chose several key parameters of radiator--spacing of fins S, height of fins H, thickness of fins t and number of Micro Heat Pipe ArrayN Has design parameters, and set minimum temperature of the chips as optimization objective. Based on the optimization algorithm we have mentioned, we designed a new radiator for high power LED lamps, through steady-heat-thermal analysis in ANSYS software, the junction temperature is far below the requirement. Therefore, the optimization algorithm can be effectively applied to radiator design of high power LED devices with the advantage of accuracy and swiftness.

关键词： optimal design micro heat pipe array high power LED lamp dissipation equivalent thermal circuit method

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Gradient piezoelectric composites for ultrasonic transducer design and imaging applications

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Journal of Materiomics 2025年

作者： Chenxue Hou Zhaoxi Li Chunlong Fei Qibo Lin Xiaofei Luo Xiongwei Wei Yiheng Yang Qi Lu Yi Quan Guangzhi Dong Zeyu Chen Xiaozhou Lü Weimin Bao Yintang Yang Shaanxi Provincial Key Laboratory of Integrated Circuit and System Integration Faculty of Integrated Circuit Xidian University Xi’an 710071 China School of Aerospace Science and Technology Xidian University Xi’an 710071 China State Key Laboratory of Precision Manufacturing for Extreme Service Performance College of Mechanical and Electrical Engineering Central South University Changsha 410083 China College of Automotive and Mechanical Engineering Changsha University of Science and Technology Changsha 410114 China Hunan Province University Key Laboratory of Intelligent Testing and Control Technology for Engineering Equipment Changsha 410114 China School of Advanced Materials and Nanotechnology Xidian University Xi'an 710126 China Furong Laboratory (Precision Medicine) Changsha 410008 China National Engineering Research Center of Personalized Diagnostic and Therapeutic Technology Xiangya Hospital Central South University Changsha 410008 China Hunan Engineering Research Center of Skin Health and Disease Xiangya Hospital Central South University Changsha 410008 China

Ultrasonic imaging technology has advanced rapidly, the escalating demand for imaging quality has driven the continuous development of ultrasonic transducers featuring high-performance. Among them, the crucial factors constraining the further enhancement of imaging quality are the frequency of the device and the intensity of the echo signal. Piezoelectric composites have become a hotspot for ultrasonic transducers and imaging applications due to their excellent properties. However, due to the limitations of the accuracy of the cutting process, the development of piezoelectric/polymer composites is often undermined by undesirable pseudo-vibrations, especially in high-frequency applications, which will significantly reduce energy conversion efficiency. In this study, a novel design method of 1-3 piezoelectric composites with gradient nanoparticle doped polymer is proposed to eliminate the undesired lateral vibrations. Based on the optimized composites, a high-performance composite ultrasonic transducer with a center frequency of 8.51 MHz is prepared. Compared with the traditional composite transducer, the optimized transducer improves the echo voltage amplitude significantly, reaching nearly 3 times. The above advantages are further verified in high-quality ultrasound and photoacoustic imaging. The optimization method has valuable guidance for the design of high-frequency composite transducers, which have great potential in ultrasonic and photoacoustic imaging applications.

关键词： Piezoelectric composites Ultrasonic transducer Imaging applications Lateral vibration Finite element analysis

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Flow Mechanism of Cooling Effectiveness Improvement for the Cylindrical Film Cooling Hole with Contoured Craters

Flow Mechanism of Cooling Effectiveness Improvement for the ...

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The 5th advanced Materials,Mechanics and Structural engineering Conference(AMMSE 2018)

作者： Linchao Bai Chao Zhang Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control National Demonstration Center for Experimental Mechanical and Electrical Engineering Education (Tianjin University of Technology)

In this paper,a typical cylindrical hole with contoured craters is investigated in terms of the downstream flow field by numerical method at blowing ratios of 0.5,1 and *** flow field and the cooling effectiveness are analyzed using threedimensional Reynolds-averaged Navier-Stokes equations with the shear stress transport turbulence *** comparison to the cylindrical hole,the cratered hole shows a wider coolant coverage in lateral direction and a lower penetration into the mainstream flow due to the larger hole exit ***,the interaction between the coolant and the curved protrusion induces a new anti-kidney-shaped vortex pair,which can obviously improve the cooling coverage and thus the cooling *** areaaveraged cooling effectiveness for the cratered hole is always higher than that for the cylindrical hole at all three blowing ratios.

关键词： Flow Mechanism of Cooling Effectiveness Improvement for the Cylindrical Film Cooling Hole with Contoured Craters

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Comparison on Thermodynamic Performances Between Basic and Regenerative Sub-critical Organic Rankine Cycles Coupled with Low Grade Heat Source

Comparison on Thermodynamic Performances Between Basic and R...

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The 5th advanced Materials,Mechanics and Structural engineering Conference(AMMSE 2018)

作者： Pengfei Yuan Chao Zhang Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control National Demonstration Center for Experimental Mechanical and Electrical Engineering Education (Tianjin University of Technology)

The coupling effects of low grade heat source on thermodynamic performances of both the basic and regenerative sub-critical Organic Rankine cycle(ORC) systems are investigated and *** inlet pressure and turbine inlet temperature are treated as independent *** system exergy efficiency is selected as the thermodynamic performance *** low grade heat source are waste hot water with temperature range of 373.15 K to 423.15 *** studies are carried out using eight common organic working fluids to recover heat energy,and relevant operating conditions are obtained *** results indicate that both hot fluid inlet temperature and the allowable minimum hot fluid outlet temperature influence the optimal working fluid,relevant turbine inlet condition and system exergy *** system exergy efficiency increases monotonously with increasing of hot fluid temperature for both ORC *** comparison to the basic cycle configuration,optimal system exergy efficiency for the regenerative system using the same working fluid is not changed if relevant turbine inlet vapor is saturated,but is significantly improved if relevant turbine inlet vapor is ***,the optimal working fluid is dependent on the heat source temperature and specific cycle configuration.

关键词： Comparison on Thermodynamic Performances Between Basic and Regenerative Sub-critical Organic Rankine Cycles Coupled with Low Grade Heat Source Basic

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Numerical Simulation about Effects of Stress on Different Cumulative Second Harmonics

Numerical Simulation about Effects of Stress on Different Cu...

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2023 IEEE Far East NDT New Technology and Application Forum, FENDT 2023

作者： Niu, Xiao-Chuan Yang, Wen-Lin Zhu, Li-Qiang Shi, Hong-Mei Zhu, Xing-Hong Beijing Jiaotong University School of Mechanical Electronic and Control Engineering Beijing100044 China Frontiers Science Center for Smart High-speed Railway System Beijing100044 China Beijing Jiaotong University Key Laboratory of Vehicle Advanced Manufacturing Measuring and Control Technology Ministry of Education Beijing100044 China China Railway Lanzhou Group Co. Ltd. Lanzhou730000 China

ISBN: (纸本)9798350303544

Nonlinear ultrasonic guided waves technology has shown excellent application potential in the field of structural stress testing due to its unique nonlinear characteristics and long distance detection range. However, the diversity and complexity of effects about stress on different cumulative second harmonics constrain the development of related research. In this paper, a numerical study about the response Law of different cumulative second harmonics with stress is undertaken based on ABAQUS software. A plate finite element model is established and the corresponding simulation experiment is carried out. The simulation result demonstrates that the variation tendencies of different cumulative second harmonic modes with stress are different, and their relative nonlinear parameters are monotonically increasing or decreasing with the increase of tensile stress. Therefore, in the application of stress detection, it is essential to analyze the response law of the selected cumulative second harmonic mode with stress change in advance. The simulation method proposed in this paper is also applicable to other studies about nonlinear ultrasonic waves and has wide applicability. © 2023 IEEE.

关键词： Ultrasonic waves

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