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The novel lattice structure design for the SL investment casting patterns

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The novel lattice structure design for the SL investment cas...

Overview of the integrated layout design of multicomponent systems

中国力学大会——2013

作者： Gu Xiaojun Zhu Jihong Zhang Weihong The key laboratory of contemporary design & integrated manufacturing technology Northwestern Polytechnical University

In this paper,we first present some numerical analysis of the SL resin patterns filled with existing lattice *** the thermal expansion and the mechanical loads are taken into account and applied on the resin *** evaluating the stress level in the ceramic shell and the stiffness of the resin pattern itself, it is found that the existing solutions do not perfectly adapt to arbitrary patterns with different geometry ***,the lattice structures are further designed with topology optimization for different SL *** inner part of the resin pattern

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Overview of the integrated layout design of multicomponent s...

design and modeling of a free-piston engine generator

中国力学大会——2013

作者： Zhang Weihong Zhu Jihong Xia Liang The key laboratory of contemporary design&integrated manufacturing technology Northwestern Polytechnical University

We review several packing optimization and overlap detection strategies,some tree-based methods,such as oc-trees and sphere-trees,and a finite circle method(FCM) proposed to favor gradient-based optimization *** layout design techniques for simultaneous packing and structure topology optimization ofmulticomponent systems are reviewed;two typical approaches for system stiffness maximization are reviewed and compared in *** ofmulticomponent systems under inertia forces is presented using polynomial interpolation

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Frontiers in Energy 2023年第6期17卷 811-821页

作者： Jinlong WANG Jin XIAO Yingdong CHENG Zhen HUANG key laboratory for Power Machinery and Engineering(ministry of education) Shanghai Jiao Tong UniversityShanghai 200240China

Free-piston engine generators (FPEGs) can be applied as decarbonized range extenders for electric vehicles because of their high thermal efficiency, low friction loss, and ultimate fuel flexibility. In this paper, a parameter-decoupling approach is proposed to model the design of an FPEG. The parameter-decoupling approach first divides the FPEG into three parts: a two-stroke engine, an integrated scavenging pump, and a linear permanent magnet synchronous machine (LPMSM). Then, each of these is designed according to predefined specifications and performance targets. Using this decoupling approach, a numerical model of the FPEG, including the three aforementioned parts, was developed. Empirical equations were adopted to design the engine and scavenging pump, while special considerations were applied for the LPMSM. A finite element model with a multi-objective genetic algorithm was adopted for its design. The finite element model results were fed back to the numerical model to update the LPMSM with increased fidelity. The designed FPEG produced 10.2 kW of electric power with an overall system efficiency of 38.5% in a stable manner. The model provides a solid foundation for the manufacturing of related FPEG prototypes.

关键词： free-piston engine generator linear permanent magnet synchronous machine system design numerical model finite element method

Foveated glasses-free 3D display with ultrawide field of view via a large-scale 2D-metagrating complex

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Light(Science & Applications) 2021年第11期10卷 2217-2225页

作者： Jianyu Hua Erkai Hua Fengbin Zhou Jiacheng Shi Chinhua Wang Huigao Duan Yueqiang Hu Wen Qiao Linsen Chen School of Optoelectronic Science and Engineering&Collaborative Innovation Center of Suzhou Nano Science and technology Soochow University215006SuzhouChina key Lab of Advanced Optical manufacturing Technologies of Jiangsu Province&key Lab of Modern Optical Technologies of education ministry of China Soochow University215006SuzhouChina State key laboratory of Advanced design and manufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan University410082ChangshaChina SVG Optronics Co.Ltd215026SuzhouChina

Glasses-free three-dimensional(3D)displays are one of the game-changing technologies that will redefine the display industry in portable electronic ***,because of the limited resolution in state-of-the-art display panels,current 3D displays suffer from a critical trade-off among the spatial resolution,angular resolution,and viewing *** by the so-called spatially variant resolution imaging found in vertebrate eyes,we propose 3D display with spatially variant information *** experiences with smooth motion parallax are maintained at the central view,while the viewing angle is enlarged at the periphery *** is enabled by a large-scale 2D-metagrating complex to manipulate dot/linear/rectangular hybrid shaped ***,a video rate full-color 3D display with an unprecedented 160°horizontal viewing angle is *** thin and light form factors,the proposed 3D system can be integrated with off-the-shelf purchased flat panels,making it promising for applications in portable electronics.

关键词： portable spatially glasses

design and Magnetic Field Uniformity of Giant Magnetostrictive Ultrasonic Transducer for Progressive Sheet Forming

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Transactions of Nanjing University of Aeronautics and Astronautics 2020年第3期37卷 393-402页

作者： LI Pengyang LIU Qiang ZHOU Xuan LI Wei WANG Limeng The ministry of education key laboratory of NC Machine Tools and integrated manufacturing Equipment Xi’an University of TechnologyXi’an 710048P.R.China key laboratory of manufacturing Equipment of Shaanxi Province Xi’an University of TechnologyXi’an 710048P.R.China

design of a giant magnetostrictive ultrasonic transducer for progressive sheet forming was presented.A dynamic analysis of the theoretically designed ultrasonic vibration system was carried out using the finite element method(FEM).In addition,simulations were performed to verify the theoretical ***,a magnetically conductive material was added between the giant magnetostrictive rod and the permanent ***,magnetic field simulations of the transducer were *** influence of the material thickness of the magnetically conductive material on uniformity of the induced magnetic field was ***,the impedance analysis and amplitude measurement were performed to compare the performance of transducers with and without the magnetically conductive *** experimental results show that the magnetic field uniformity is the highest when the magnetically conductive material has a thickness of about 1.6 *** output amplitude of the giant magnetostrictive transducer is improved by adding the magnetically conductive ***,the mechanical quality factor and impedance are reduced,while the transducer operates more stably.

关键词： giant magnetostrictive material(GMM) ultrasonic transducer magnetic field uniformity finite element analysis

The Use of Genetic Algorithm and Annealing Algorithm for The Optimization of Dimension Chain

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The Use of Genetic Algorithm and Annealing Algorithm for The...

Adaptive modification of turbofan engine nonlinear model based on LSTM neural networks and hybrid optimization method

2012年计算机应用与系统建模国际会议

作者： Haiming Kan Haibin Li Jie Liu Weilong Zhang ministry of education key Lab of contemporary design & integrated Manu. Tech. Northwestern Polytechnical Uni

The error accumulation is currently working procedure dimension chain, an important problem in the increasing of the error will reduce production speed and increase production cost. Traditional mode of production in production efficiency and production cost above tend to attend. This paper using Simulated Annealing (SA) algorithm and genetic algorithm (GA) combination of mixed Simulated annealing and Genetic algorithm (SG algorithm), put genetic algorithm’s parallelism into annealing algorithm, thus improving annealing algorithm in computational speed. In a certain extent to optimize dimension chain, reduce error accumulation calculation speed, reduce production cost.

关键词： dimension chain SG algorithm parallelism optimize

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Chinese Journal of Aeronautics 2022年第9期35卷 314-332页

作者： Yanhua MA Xian DU Ximing SUN School of Microelectronics Dalian University of TechnologyDalian 116024China key laboratory of Intelligent Control and Optimization for Industrial Equipment Ministry of EducationDalian University of TechnologyDalian 116024China School of Control Science and Engineering Dalian University of TechnologyDalian 116024China

An accurate and reliable turbofan engine model which can describe its dynamic behavior within the full flight envelop and lifecycle plays a critical role in performance optimization, controller design and fault diagnosis. However, due to the performance differences caused by the tolerance of engine manufacturing and assembly, and performance degradation during continuously stringent environmental regulations, the model accuracy is severely reduced. In this paper, an adaptive modification method of turbofan engine nonlinear Component-Llevel Model(CLM) based on Long Short-Term Memory(LSTM) Neural Network(NN) and hybrid optimization algorithm is pro-posed. First, a dynamic compensator with a combined LSTM NN architecture is constructed to compensate for the initial error between the experimental data and CLM of a turbofan engine under health condition. Then, a sensitivity analysis approach based on the entropy coefficient and technique for order preference by similarity to an ideal solution integrated evaluation is developed to choose the unmeasurable health parameters to be adjusted. Finally, a parallel hybrid optimization algorithm is developed to complete the adaptive model modification when the performance degrades. The proposed method is verified on a military low-bypass twin-spool turbofan engine, and the experimental results show the effectiveness of the proposed method.

关键词： Hybrid optimization Long short-term memory Model modification and testing Sensitivity analysis Turbofan engines

A Generic Kinematic Model for Three Main Types of Five-axis Machine Tools

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International Journal of Plant Engineering and Management 2009年第4期14卷 243-249页

作者： YU Yang WEI Sheng-min LIU Ping AO Zhi-qiang key laboratory of ministry of education for contemporary design and integrated manufacturing technology Northwestern Polytechnical University Xi'an P. R. 710072 P.R. China Aeronautic and Mechanical Engineering College Nanchang Hangkong University Nanchang 330063 P.R. China

Material removal is one of the most used processes in manufacturing. Five-axis CNC machines are believed to be the best tools in sculptured surface machining. In this study, a generic and unified kinematic model was developed as a viable alternative to the particular solutions that are only applicable to individual machine configurations. This versatile model is then used to verify the feasibility of the two rotational joints within the kinematic chain of three main types of a five-axis machine-tool. This versatile model is very useful applied to the design of five-axis machine tools.

关键词： CNC machining of sculptured surfaces five-axis machine tool configuration kinematic model transformation matrix

Digital twin-driven green material optimal selection and evolution in product iterative design

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Advances in manufacturing 2023年第4期11卷 647-662页

作者： Feng Xiang Ya-Dong Zhou Zhi Zhang Xiao-Fu Zou Fei Tao Ying Zuo key laboratory of Metallurgical Equipment and Control technology Ministry of EducationWuhan University of Science and TechnologyWuhan430081People’s Republic of China Hubei key laboratory of Mechanical Transmission and manufacturing Engineering Wuhan University of Science and TechnologyWuhan430081People’s Republic of China Institute of Artificial Intelligence Beihang UniversityBeijing100191People’s Republic of China School of Automation Science and Electrical Engineering Beihang UniversityBeijing100191People’s Republic of China Research Institute for Frontier Science Beihang UniversityBeijing100191People’s Republic of China

In recent years,green concepts have been integrated into the product iterative design in the manufacturing field to address global competition and sustainability ***,previous efforts for green material optimal selection disregarded the interaction and fusion among physical entities,virtual models,and users,resulting in distortions and inaccuracies among user,physical entity,and virtual model such as inconsistency among the expected value,predicted simulation value,and actual performance value of evaluation ***,this study proposes a digital twin-driven green material optimal selection and evolution method for product iterative ***,a novel framework is ***,an analysis is carried out from six perspectives:the digital twin model construction for green material optimal selection,evolution mechanism of the digital twin model,multi-objective prediction and optimization,algorithm design,decision-making,and product function ***,taking the material selection of a shared bicycle frame as an example,the proposed method was verified by the prediction and iterative optimization of the carbon emission index.

关键词： Product iterative design Digital twin(DT) Green material optimal selection Evolution mechanism Iterative optimization