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Synthetic Turbulence Constructed by Self-Learning Fractal Interpolation

Chinese Physics Letters 2012年第10期29卷 125-128页

作者： WANG Yan-Zhi ZHANG Zhi-Xiong SHI Yi-Peng SHE Zhen-Su State Key Laboratory of Turbulence and Complex Systems and College of Engineering Peking UniversityBeijing 100871 beijing aeronautical science and technology research institute of comac future science&technology park Changping DistrictBeijing 102211

A self-learning fractal interpolation algorithm to construct synthetic fields with statistical properties close to real turbulence is *** from our previous work[***.E 84(2011)026328,82(2010)036311],the position mapping and stretching factors between the adjacent large and small scales are learned from the initial *** this method,a turbulence-like field with K41 spectra and without dissipation is constructed well through a coarse grid velocity signal from one experiment's *** filtering the interpolated signal appropriately,the probability distribution of velocity,velocity structure functions and the anomalous scaling law of the synthetic field are close to those of the original signal.

关键词： turbulence stretching interpolation

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Fatigue Crack Detection in Steel Plates Using Guided Waves and an Energy-Based Imaging Approach

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Structural Durability & Health Monitoring 2021年第3期15卷 207-225页

作者： Mingyu Lu and Qiang Wang Kaige Zhu beijing Key Laboratory of Civil Aircraft Structures and Composite Materials COMAC Beijing Aircraft Technology Research InstituteFuture Science and Technology ParkBeijing102211China College of Automation&College of Artificial Intelligence Nanjing University of Posts and TelecommunicationsNanjing210023China

Tyre Pressure Monitoring Systems(TPMS)are installed in automobiles to monitor the pressure of the *** pressure is an important parameter for the comfort of the travelers and the safety of the *** methods have been researched and reported for *** them,vibration-based indirect TPMS using machine learning techniques are the recent *** literature reported the results for a perfectly balanced ***,if there is a small unbalance,which is very common in automobile wheels,‘What will be the effect on the classification accuracy?’is the question on *** paper attempts to study the effect of unbalance of the wheel on the classification accuracy of an indirect TPMS *** tyres filled with air are considered with different pressure values to represent puncture,normal,under pressure and overpressure *** vibration signals of each condition were acquired and processed using machine learning *** procedure is carried out with perfectly balanced wheels and known unbalanced *** results are compared and presented.

关键词： Tyre pressure monitoring system wheel unbalance random committee classifier machine learning

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Progress in additive manufacturing on new materials: A review

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Journal of Materials science & technology 2019年第2期35卷 242-269页

作者： Neng Li Shuai Huang Guodong Zhang Renyao Qin Wei Liu Huaping Xiong Gongqi Shi Jon Blackburn 3D Printing research & Engineering technology Center Beijing Institute of Aeronautical Materials TWI Ltd Granta Park Great Abington

Recent efforts and advances in additive manufacturing(AM) on different types of new materials are presented and reviewed. Special attention is paid to the material design of cladding layers, the choice of feedstock materials, the metallurgical behavior and synthesis principle during the AM process, and the resulted microstructures and properties, as well as the relationship between these factors. Thereafter,the trend of development in the future is forecasted, including: Effects of the particles size and size distribution of powders; Approaches for producing fine microstructures; Opportunities for creating new materials by AM; Wide applications in reconditioning of damaged components; Challenges for deep understanding and applications of the AMed new materials. The idea of "Develop Materials" or "Create Materials" by AM is highlighted, but a series of scientific, technological and engineering problems remain to be solved in future.

关键词： Additive manufacturing Feedstock material Laser and electron beam melting Microstructure Property

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An analytic model for transient heat conduction in bi-layered structures with flexible serpentine heaters

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Applied Mathematics and Mechanics(English Edition) 2021年第9期42卷 1279-1296页

作者： Zhao ZHAO Yuhang LI Sujun DONG Yi CUI Zheng DAI institute of Solid Mechanics Beihang UniversityBeijing 100191China School of Aeronautic science and Engineering Beihang UniversityBeijing 100191China Shanghai Aircraft Design&research institute of Commercial Aircraft Corporation of China(comac) Shanghai 201210China

Uniform heating of complex surfaces,especially non-developable surfaces,is a crucial problem that traditional rigid heaters cannot *** by flexible electronic devices,a novel design for the stretchable heating film is proposed with the flexible serpentine wire embedded in the soft polymer film,which can be attached to non-developable surfaces *** provides a new way for the stretchable heaters to realize uniform heating of complex ***,the thermal field of flexible serpentine heaters(FSHs)depends on the configurations of the embedded serpentine heating wire,which requires accurate theoretical prediction of real-time temperature ***,the analytical model for the transient heat conduction in FSHs is solved by the separation of variables method and validated by the finite element analysis(FEA)in this *** on this model,the effects of the geometric parameters,such as the radius and the length of the serpentine heaters,on the thermal uniformity are systematically *** study can help to design and fabricate flexible heaters with uniform heating in the future.

关键词： serpentine heater bi-layered structure transient heat conduction temperature distribution

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