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Machine learning-assisted sparse observation assimilation for real-time aerodynamic field perception

Science China(Technological Sciences) 2024年第5期67卷 1458-1469页

作者： ZHAO QingYu huang Jun GUO YuXin PAN YuXuan JI JingJing huang yongan State Key Laboratory of Intelligent Manufacturing Equipment and Technology School of Mechanical Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Accurate aerodynamic distribution perception and real-time flight state evaluation are crucial for flight safety,e.g.,stall ***,the observations are usually sparse due to limitations in sensor mounting space and cost,and a reconstruction technology is urgently ***,a machine learning-assisted assimilation method based on sparse observations has been *** from the traditional reconstruction methods focusing on boundary condition correction,the proposed method formulates the flow field pressure distribution as a linear superposition of flow field modes,thereby forming a real-time reconstruction pattern that combines offline modal extraction using computational fluid dynamics(CFD)with real-time determination of modal weights using a neural *** this study,CFD simulations were conducted under 800different operating conditions for common modal extraction and model *** weights of these modes were determined online based on merely five observations for reconstructing the full pressure field.A pressure reconstruction with a relative error of 6.1%and a mean square error of 0.003 was achieved within the prescribed condition *** computational cost was just2 ms for each reconstruction run,significantly faster than the 20 min required by the classical reconstruction ensemble transform Kalman *** also showed that the method maintains almost the same accuracy amidst 1.5%measurement *** practical examples,shock waves and the change of lift coefficient were analyzed using the proposed method,providing remarkable evidence for the capability of the method in supporting stall *** validate the method’s effectiveness and explore its potential in real-time and accurate monitoring of an aircraft.

关键词： aerodynamic force sparse observation neural networks pressure field reconstruction

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Experimental study of solid-liquid origami composite structures with improved impact resistance

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Theoretical & Applied Mechanics Letters 2024年第2期14卷 118-123页

作者： Shuheng Wang Zhanyu Wang Bei Wang Zhi Liu Yunzhu Ni Wuxing Lai Shan Jiang Yong An huang AML Department of Engineering MechanicsLaboratory of Flexible Electronics TechnologyTsinghua UniversityBeijing 100084China Institute of Advanced Structure Technology Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and StructuresBeijing Institute of TechnologyBeijing 100081China Hangzhou Institute of Technology Xidian UniversityHangzhou 311200China Nanjing Research Institude of Electronics Technology Nanjing 210039China The Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China State Key Laboratory of Intelligent Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan 430074China

In this paper,a liquid-solid origami composite design is proposed for the improvement of impact *** this design strategy,Kresling origami composite structures with different fillings were designed and fabricated,namely air,water,and shear thickening fluid(STF).Quasi-static compression and drop-weight impact experiments were carried out to compare and reveal the static and dynamic mechanical behavior of these *** results from drop-weight impact experiments demonstrated that the solid-liquid Kresling origami composite structures exhibited superior yield strength and reduced peak force when compared to their empty ***,the Kresling origami structures filled with STF exhibited significantly heightened yield strength and reduced peak *** example,at an impact velocity of 3 m/s,the yield strength of single-layer STF-filled Kresling origami structures increased by 772.7%and the peak force decreased by 68.6%.This liquid-solid origami composite design holds the potential to advance the application of origami structures in critical areas such as aerospace,intelligent protection and other important *** demonstrated improvements in impact resistance underscore the practical viability of this approach in enhancing structural performance for a range of applications.

关键词： Solid-liquid design Origami structure Impact resistance Shear thickening fluid

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基于改进离散-连续参数化的结构和连续材料方向协同拓扑优化方法

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Acta Mechanica Sinica 2024年第1期40卷 197-209页

作者：罗云锋刘书田仇政麻耀辉黄永安 State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and Technology Wuhan 430074 China State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of TechnologyDalian 116024China

结构和材料方向的并行拓扑优化是过去几十年来的一个热门话题.然而,如何避免此类问题掉入局部最优相当具有挑战性。为了解决这个问题,我们在以前的工作中提出了一种将离散材料优化方法和连续纤维取向优化方法相结合的方法,称之为离散-... 详细信息

结构和材料方向的并行拓扑优化是过去几十年来的一个热门话题.然而,如何避免此类问题掉入局部最优相当具有挑战性。为了解决这个问题,我们在以前的工作中提出了一种将离散材料优化方法和连续纤维取向优化方法相结合的方法,称之为离散-连续参数化(DCP),该方法同时继承了离散方法的全局搜索能力和连续方法的全设计空间然而,DCP方法需要太多设计变量,导致了巨大的计算负担.因此,我们在本工作中提出了一种改进的DCP方法,以减少设计变量的数量,同时又不牺牲优化问题的凸性。在该方法中,我们提出了一种扩展的多材料插值方法,该方法能够大大减少设计变量的数量。然后,我们将所提出的插值方法集成到DCP方法中,最终建立了结构拓扑和纤维取向协同优化的改进DCP方法.几个基准优化实例表明,该方法可以在能大大降低陷入局部最优的风险的同时,使用更少的设计变量.

关键词：纤维取向设计变量协同优化插值方法 DCP 材料优化拓扑优化结构拓扑

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飞行器智能蒙皮异质多层电路制造技术进展

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航空制造技术 2024年第13期67卷 68-83页

作者：戈家影文钧民叶冬黄永安华中科技大学智能制造装备与技术全国重点实验室武汉430074

智能蒙皮在飞行器承载结构蒙皮表面集成异质多功能电路系统,是实现未来变体飞行器“Fly-by-Feel”的使能技术。飞行器智能蒙皮涉及多功能分布式传感系统、共形天线、频率选择表面、防/除冰等功能模块,这提升了飞行器态势感知能力并促进... 详细信息

智能蒙皮在飞行器承载结构蒙皮表面集成异质多功能电路系统,是实现未来变体飞行器“Fly-by-Feel”的使能技术。飞行器智能蒙皮涉及多功能分布式传感系统、共形天线、频率选择表面、防/除冰等功能模块,这提升了飞行器态势感知能力并促进其结构向轻量化发展,其技术关键在于复杂3D结构表面异质多层电路的成型制造。针对智能蒙皮多功能电路制造难题,本文对不同种类曲面功能单元制造中的难点进行详细分析,并对比阐述适用于不同类型结构的制造技术,包括共形打印、通孔互联、曲面贴装、薄膜制备等。最后总结和展望了智能蒙皮异质多层电路制造技术面临的挑战和潜在解决方案,为下一代飞行器智能蒙皮制造技术的突破提供有益的参考。

关键词：智能蒙皮多层电路共形打印通孔互连曲面贴装薄膜制备

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Preface:Celebrating the 70th Anniversary of School of Mechanical Science and Engineering,Huazhong University of Science and Technology

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Science China(Technological Sciences) 2022年第9期65卷 1913-1914页

作者： huang yongan YIN ZhouPing State Key Laboratory of Digital Manufacturing Equipment and Technology School of Mechanical Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Huazhong University of Science and Technology (HUST) is a key research-based comprehensive university in Wuhan, China,under the direct supervision of the Ministry of Education of China. Renowned as the epitome of the development of higher education in new China, it is a “211” Project,“985” Project,“Double First-Class” university in China.

关键词： owned China education

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Flexible hybrid electronics:Enabling integration techniques and applications

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Science China(Technological Sciences) 2022年第9期65卷 1995-2006页

作者： WU Hao huang yongan YIN ZhouPing Flexible Electronics Research Center State Key Laboratory of Digital Manufacturing Equipment and TechnologySchool of Mechanical Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

The conventional electronic systems enabled by rigid electronic are prone to malfunction under deformation,greatly limiting their application *** an emerging platform for applications in healthcare monitoring and human-machine interface(HMI),flexible electronics have attracted growing attention due to its remarkable advantages,such as stretchability,flexibility,conformability,and wearing ***,to realize the overall electronic systems,rigid components are also required for functions such as signal acquisition and ***,flexible hybrid electronics(FHE),which simultaneously possesses the desirable flexibility and enables the integration of rigid components for functionality,has been emerging as a promising *** paper reviews the enabling integration techniques for FHE,including technologies for two-dimensional/three-dimensional(2 D/3 D) interconnects,bonding of rigid integrated circuit(IC) chips to soft substrate,stress-isolation structures,and representative applications of *** addition,future challenges and opportunities involved in FHE-based systems are also discussed.

关键词： deformation electronics bonding

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Conformable,programmable and step-linear sensor array for large-range wind pressure measurement on curved surface

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Science China(Technological Sciences) 2020年第10期63卷 2073-2081页

作者： XIONG WenNan GUO DongLiang YANG ZhaoXi ZHU Chen huang yongan State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan 430074China Flexible Electronics Research Center Huazhong University of Science and TechnologyWuhan 430074China

The wind pressure measurement,especially on curved surfaces is imperative in revealing flow *** flexible sensor with high linear sensitivity over large pressure range is still a significant challenge,especially for commutatively positive and negative pressure ***,we propose a conformable,range-programmable capacitive sensor that can extremely extend the measuring range but with high linear *** key point is to precisely control the reference pressure of the flexible capacitive sensor array through microchannel *** proposed sensor with reference pressure 0 kPa keeps stable at a highly-linear sensitivity of 0.28 kPa-1 in an initial measurement regime from 0 to 3 kPa,beyond which the linearity changes *** the tunable reference pressure,the linear ranges can be customized arbitrarily according to different flight conditions and measured positions,but without any deterioration of *** theoretical model is built for the flexible capacitive sensor with tunable reference pressure,agreeing well with the experimental and finite element method ***,the bending effect is discovered when the flexible sensor is conformed on curved *** surface-mounted sensor skin is tested on a plate and is integrated with acquisition circuits on a standard airfoil NACA0012 in a wind tunnel and compares with the standard destructive method of pressure *** shows great potential applications in measuring wind pressure on curved surfaces,such as for"Fly-by-Feel"of unmanned aerial vehicles and wind tunnel test.

关键词： capacitive sensor flexible electronics smart sensing skin wind tunnel test unmanned aerial vehicles

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Real-time adaptive particle image velocimetry for accurate unsteady flow field measurements

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Science China(Technological Sciences) 2022年第9期65卷 2143-2155页

作者： OUYANG ZhenXing YANG Hua LU Jin huang yongan YIN ZhouPing State Key Laboratory of Digital Manufacturing Equipment and Technology School of Mechanical Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Almost all conventional open-loop particle image velocimetry(PIV) methods employ fixed-interval-time optical imaging technology and the time-consuming cross-correlation-based PIV measurement algorithm to calculate the velocity *** this study,a novel real-time adaptive particle image velocity(RTA-PIV) method is proposed to accurately measure the instantaneous velocity field of an unsteady flow *** the proposed closed-loop RTA-PIV method,a new correlation-filter-based PIV measurement algorithm is introduced to calculate the velocity field in real ***,a Kalman predictor model is established to predict the velocity of the next time instant and a suitable interval time can be *** adaptively adjust the interval time for capturing two particle images,a new high-speed frame-straddling vision system is developed for the proposed RTA-PIV *** fully analyze the performance of the RTA-PIV method,we conducted a series of numerical experiments on ground-truth image pairs and on real-world image sequences.

关键词： real-time adaptive particle image velocimetry flow field measurement high-speed vision correlation filter

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Analytical investigation on thermal-induced warpage behavior of ultrathin chip-on-flex(UTCOF) assembly

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Science China(Technological Sciences) 2016年第11期59卷 1646-1655页

作者： CHEN JianKui XU ZhouLong huang yongan DUAN YongQing YIN ZhouPing State Key Laboratory of Digital Manufacturing Equipment and Technology Flexible Electronics Research Center Huazhong University of Science and Technology

The serious warpage issues of ultrathin chip-on-flex(UTCOF) assembly induced by mismatched thermal stresses have greatly affected the mechanical stability and reliability of emerging ultrathin chip packaging technology. Currently, a theoretical prediction as a convenient and straightforward approach is still lacked for describing effectively the thermal-mechanical behavior of UTCOF during the adhesive curing and cooling process. In consideration of the adhesive thickness approximating to ultrathin chip and flexible substrate thickness, we develop a layerwise-model of ultrathin chip-adhesive-flex structure under plain strain condition, where the behavior of thick adhesive bonding can be described precisely through increasing the subdivided mathematical plies. Further, the analytical results show that the concave and convex forms of ultrathin chip warpage yield at the end of the curing and cooling process respectively. Meanwhile, the effects of its structure dimensions and material properties are also revealed for discussing a way to relieve the extent of ultrathin chip warpage. Additionally, in order to verify the validity of the theoretical prediction, we also introduce the corresponding numerical technique and experimental method. These results suggest that a kind of rigid and ultrathin flexible substrate such as metal foil should be adopted for small warpage of ultrathin assembly.

关键词： microelectronic packaging warpage layerwise theory ultrathin chip

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Driving force planning in shield tunneling based on Markov decision processes

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Science China(Technological Sciences) 2012年第4期55卷 1022-1030页

作者： HU XiangTao huang yongan YIN ZhouPing XIONG YouLun State Key Laboratory of Digital Manufacturing Equipment&Technology Huazhong University of Science&TechnologyWuhan 430074China

In shield tunneling, the control system needs very reliable capability of deviation rectifying in order to ensure that the tunnel trajectory meets the permissible criterion. To this goal, we present an approach that adopts Markov decision process (MDP) theory to plan the driving force with explicit representation of the uncertainty during excavation. The shield attitudes of possi- ble world and driving forces during excavation are scattered as a state set and an action set, respectively. In particular, an evaluation function is proposed with consideration of the stability of driving force and the deviation of shield attitude. Unlike the deterministic approach, the driving forces based on MDP model lead to an uncertain effect and the attitude is known only with an imprecise probability. We consider the case that the transition probability varies in a given domain estimated by field data, and discuss the optimal policy based on the interval arithmetic. The validity of the approach is discussed by comparing the driving force planning with the actual operating data from the field records of Line 9 in Tianjin. It is proved that the MDP model is reasonable enough to predict the driving force for automatic deviation rectifying.

关键词： shield tunneling Markov decision process automatic deviation rectifying interval arithmetic driving force planning

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