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Impact Force Localization and Reconstruction via ADMM-based Sparse Regularization Method

Chinese Journal of Mechanical Engineering 2024年第3期37卷 170-188页

作者： Yanan Wang Lin Chen junjiang liu Baijie Qiao Weifeng He Xuefeng Chen National Key Lab of Aerospace Power System and Plasma Technology Xi’an Jiaotong UniversityXi’an 710049China School of Mechanical Engineering Xi’an Jiaotong UniversityXi’an 710049China

In practice,simultaneous impact localization and time history reconstruction can hardly be achieved,due to the illposed and under-determined problems induced by the constrained and harsh measuring *** l_(1) regularization can be used to obtain sparse solutions,it tends to underestimate solution amplitudes as a biased *** address this issue,a novel impact force identification method with l_(p) regularization is proposed in this paper,using the alternating direction method of multipliers(ADMM).By decomposing the complex primal problem into sub-problems solvable in parallel via proximal operators,ADMM can address the challenge *** mitigate the sensitivity to regularization parameters,an adaptive regularization parameter is derived based on the K-sparsity ***,an ADMM-based sparse regularization method is developed,which is capable of handling l_(p) regularization with arbitrary p values using adaptively-updated *** effectiveness and performance of the proposed method are validated on an aircraft skin-like composite ***,an investigation into the optimal p value for achieving high-accuracy solutions via l_(p) regularization is *** turns out that l_(0.6)regularization consistently yields sparser and more accurate solutions for impact force identification compared to the classic l_(1) regularization *** impact force identification method proposed in this paper can simultaneously reconstruct impact time history with high accuracy and accurately localize the impact using an under-determined sensor configuration.

关键词： Impact force identification Non-convex sparse regularization Alternating direction method of multipliers Proximal operators

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Non-convex sparse optimization-based impact force identification with limited vibration measurements

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Frontiers of Mechanical Engineering 2023年第3期18卷 165-185页

作者： Lin CHEN Yanan WANG Baijie QIAO junjiang liu Wei CHENG Xuefeng CHEN National Key Laboratory of Aerospace Power System and Plasma Technology Xi'an Jiaotong UniversityXi'an 710049China School of Mechanical Engineering Xi'an Jiaotong UniversityXi'an 710049China

Impact force identification is important for structure health monitoring especially in applications involving composite *** from the traditional direct measurement method,the impact force identification technique is more cost effective and feasible because it only requires a few sensors to capture the system response and infer the information about the applied *** technique enables the acquisition of impact locations and time histories of forces,aiding in the rapid assessment of potentially damaged areas and the extent of the *** a typical inverse problem,impact force reconstruction and localization is a challenging task,which has led to the development of numerous methods aimed at obtaining stable *** classicalℓ2 regularization method often struggles to generate sparse *** solving the under-determined problem,ℓ2 regularization often identifies false forces in non-loaded regions,interfering with the accurate identification of the true impact *** popularℓ1 sparse regularization,while promoting sparsity,underestimates the amplitude of impact forces,resulting in biased *** alleviate such limitations,a novel non-convex sparse regularization method that uses the non-convexℓ1-2 penalty,which is the difference of theℓ1 andℓ2 norms,as a regularizer,is proposed in this *** principle of alternating direction method of multipliers(ADMM)is introduced to tackle the non-convex model by facilitating the decomposition of the complex original problem into easily solvable *** proposed method namedℓ1-2-ADMM is applied to solve the impact force identification problem with unknown force locations,which can realize simultaneous impact localization and time history reconstruction with an under-determined,sparse sensor *** and experiments are performed on a composite plate to verify the identification accuracy and robustness with respect to the noise of theℓ1-2-ADMM ***

关键词： impact force identification inverse problem sparse regularization under-determined condition alternating direction method of multipliers

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Signaling pathways in cancer-associated fibroblasts and targeted therapy for cancer

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Signal Transduction and Targeted Therapy 2021年第7期6卷 2034-2068页

作者： Fanglong Wu Jin Yang junjiang liu Ye Wang Jingtian Mu Qingxiang Zeng Shuzhi Deng Hongmei Zhou State Key Laboratory of Oral Diseases National Center of StomatologyNational Clinical Research Center for Oral DiseasesWest China Hospital of StomatologySichuan UniversityChengduSichuanPeople's Republic of China

To flourish,cancers greatly depend on their surrounding tumor microenvironment(TME),and cancer-associated fibroblasts(CAFs)in TME are critical for cancer occurrence and progression because of their versatile roles in extracellular matrix remodeling,maintenance of sternness,blood vessel formation,modulation of tumor metabolism,immune response,and promotion of cancer cell proliferation,migration,invasion,and therapeutic *** are highly heterogeneous stromal cells and their crosstalk with cancer cells is mediated by a complex and intricate signaling network consisting of transforming growth factor-beta,phosphoinositide 3-kinase/AKT/mammalian target of rapamycin,mitogen-activated protein kinase,Wnt,Janus kinase/signal transducers and activators of transcription,epidermal growth factor receptor,Hippo,and nuclear factor kappa-light-chain-enhancer of activated B cells,etc.,signaling *** signals in CAFs exhibit their own special characteristics during the cancer progression and have the potential to be targeted for anticancer ***,a comprehensive understanding of these signaling cascades in interactions between cancer cells and CAFs is necessary to fully realize the pivotal roles of CAFs in ***,in this review,we will summarize the enormous amounts of findings on the signals mediating crosstalk of CAFs with cancer cells and its related targets or ***,we hypothesize three potential targeting strategies,including,namely,epithelial-mesenchymal common targets,sequential target perturbation,and crosstalk-directed signaling targets,paving the way for CAF-directed or host cell-directed antitumor therapy.

关键词： targeted metabolism invasion

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Low-temperature epitaxy of transferable high-quality Pd(111)films on hybrid graphene/Cu(111)substrate

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Nano Research 2019年第11期12卷 2712-2717页

作者： Zhihong Zhang Xiaozhi Xu Ruixi Qiao junjiang liu Yuxia Feng Zhibin Zhang Peizhao Song Muhong Wu Lan Zhu Xuelin Yang Peng Gao Lei liu Jie Xiong Enge Wang Kaihui liu State Key Laboratory for Mesoscopic Physics International Centre for Quantum MaterialsCollaborative Innovation Centre of Quantum MatteSchool of PhysicsAcademy for Advanced Interdisciplinary StudiesPeking UniversityBejing 100871China Physical Science Laboratory Huairou National Comprehensive Science CentreBeijing 101400China School of Physics and Telecommunication Engineering South China Normal UniversityGuangzhou 510631China Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing 100871China Songshan Lake Materials Laboratory Institute of PhysicsChinese Academy of SciencesGuangdong 523808China Peking Union Medical College Hospital Beijing 100730China State Key Laboratory of Electroric Thin Films and ltegrated Devices University of Electronic Science and Teclmology of ChinaChengdu 610054China

The continuous pursuit of miniaturization in the electronics and optoelectronics industry demands all device components with smaller size and higher performance,in which thin metal film is one heart material as conductive ***,conventional metal filmns are typically polycrystalline with random domain orientations and various grain boundaries,which greatly degrade their mechanical,thermal and electrical ***,it is highly demanded to produce single-crystal metal films with epitaxy in an appealing *** epitaxy on non-metal single-crystal substrates has difficulty in exfoliating away due to the formation of chemical *** developed epitaxy on single-crystal graphene enables the easy exfoliation of epilayers but the annealing temperature must be high(typical 500-1,000℃ and out of the tolerant range of integrated circuit technology)due to the relative weak intertacial *** we demonstrate the facile production of 6-inch transferable high-quality Pd(111)filims on single-crystal hybrid graphene/Cu(111)substrate with CMOS-compatible annealing temperature of 150℃ *** interfacial interaction between Pd and hybrid graphene/Cu(111)substrate is strong enough to enable the low-temperature epitaxy of Pd(111)films and weak enough to facilitate the easy film release from *** obtained Pd(111)films possess superior properties to polyrystalline ones with-0.25 eV higher work function and almost half sheet *** technique is proved to be applicable to other metals,such as Au and *** the single-crystal graphene/Cu(111)substrates are obtained from industrial Cu foils and accessible in meter scale,our work will promote the massive applications of large-area high-quality metal fims in the development of next-generation electronic and optoelectronic devices.

关键词： single-crystal metal film graphene/Cu(111)substrate intertacial interactions meter scale

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Effect of electromagnetic stirring methods on solidification structures of Sn-11% Sb binary alloy

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Baosteel Technical Research 2012年第2期6卷 55-59页

作者： HOU Xiaoguang liu junjiang Baoshan lron&Steel Co. Ltd.Shanghai 200431China Northeasten University Shenyang 110004China

In this paper, a spiral magnetic field electromagnetic stirrer, which can separately induce two different magnetic fields ,is introduced. The corresponding central magnetic flux curves of the stirrer were measured by two different probes of the Tesla meter. Meanwhile, the mentioned spiral magnetic field electromagnetic stirrer was used, the effect of the two different magnetic fields on solidification of Sn-I 1% Sb binary alloy was studied,and the segregations and metallographic structures of the ingot samples were analyzed. The research results show that, with the same electromagnetic stirring parameters,the spiral magnetic field electromagnetic stirring is more effective in reducing the composition difference between the upper and lower parts of the ingot. The microstructure photos show that the grain size was more refined.

关键词： spiral magnetic field rotating magnetic field segregation grain refinement Sn-Sb alloy

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基于天线扫描形状的信号聚类算法介绍

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电子信息对抗技术 2022年第5期37卷 24-27页

作者：刘俊江周旭徐立中国电子科技集团公司第二十九研究所成都610036 海军装备部成都610036

雷达信号分选技术作为现代信息对抗领域重要发展方向之一,对雷达侦察信号处理非常重要。首先介绍几种常见的雷达信号分选方法,并对每种算法的优缺点进行简要说明。随后提出一种基于天线扫描的能量域信号聚类方法,介绍该算法的原理,给出... 详细信息

雷达信号分选技术作为现代信息对抗领域重要发展方向之一,对雷达侦察信号处理非常重要。首先介绍几种常见的雷达信号分选方法,并对每种算法的优缺点进行简要说明。随后提出一种基于天线扫描的能量域信号聚类方法,介绍该算法的原理,给出仿真的结果。通过仿真试验,证明该信号聚类算法对于机械扫描雷达能够取得较好的聚类效果。

关键词：天线扫描雷达信号分选信息对抗

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基于数字全息显微术的液体透镜参数测量方法

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中国激光 2014年第11期41卷 234-238页

作者：刘俊江李恩普邸江磊赵建林西北工业大学理学院、教育部空间应用物理与化学重点实验室、陕西省光信息技术重点实验室陕西西安710072

提出了一种利用数字全息显微术测量液体透镜表面曲率半径及焦距参数的实验方法。针对液体透镜表面不能接触、直径较小、侧壁材料非透明等因素,采用具有像差校正功能的立式马赫-曾德尔干涉仪光路实验记录液体透镜液面的数字全息图,数值... 详细信息

提出了一种利用数字全息显微术测量液体透镜表面曲率半径及焦距参数的实验方法。针对液体透镜表面不能接触、直径较小、侧壁材料非透明等因素,采用具有像差校正功能的立式马赫-曾德尔干涉仪光路实验记录液体透镜液面的数字全息图,数值再现得到携带液面信息的物光波前相位分布信息,并经数值计算和拟合得到液面轮廓曲线,最终得出液面曲率半径以及液体透镜的焦距等参数,进而利用该方法对标准平凹透镜的曲率半径和焦距等参数进行了测量,以验证其正确性。结果表明,所提出的方法是一种高精度、非接触测量液体透镜液面曲率及焦距参数的有效手段。

关键词：全息数字全息显微术液体透镜曲率半径焦距

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化工机械设备维修过程中常见问题研究

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当代化工研究 2021年第20期 140-141页

作者：刘俊江新疆天利石化控股集团有限公司新疆833699

在我国当前的经济发展中离不开大型机械化设备,而保证机械化设备正常运行是保障企业生产、社会经济发展的一个重要因素,不过在某些企业设备的具体使用中常常会出现问题,像机器的故障等,这大大影响了企业的生产进度,让企业付出更多的成... 详细信息

在我国当前的经济发展中离不开大型机械化设备,而保证机械化设备正常运行是保障企业生产、社会经济发展的一个重要因素,不过在某些企业设备的具体使用中常常会出现问题,像机器的故障等,这大大影响了企业的生产进度,让企业付出更多的成本。对此,本文针对化工机械设备维修过程中常见的问题进行了分析和研究,并提出一些科学的维修措施,以期达到提高企业设备工作效率,减少企业不必要支出,提高企业经济利益的目标。

关键词：化工机械化设备解决措施维修与保养

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基于自适应相关的雷达信号分选

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电子信息对抗技术 2020年第3期35卷 35-39页

作者：刘俊江电子信息控制重点实验室成都610036

雷达信号分选技术作为现代信息对抗领域重要发展方向之一,对雷达侦察信号处理非常重要。首先介绍几种常见的雷达信号分选方法,并对每种算法的优缺点进行简要地说明。随后提出一种基于自适应相关的雷达信号分选方法,介绍该算法的原理,给... 详细信息

雷达信号分选技术作为现代信息对抗领域重要发展方向之一,对雷达侦察信号处理非常重要。首先介绍几种常见的雷达信号分选方法,并对每种算法的优缺点进行简要地说明。随后提出一种基于自适应相关的雷达信号分选方法,介绍该算法的原理,给出仿真的结果。通过仿真试验,所采用的雷达信号分选算法对于某些雷达取得了较好的分选效果。

关键词：自适应相关雷达信号分选信息对抗

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机载火控雷达工作模式识别

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电子测量技术 2016年第2期39卷 131-133,146页

作者：刘俊江中国电科集团公司第29所成都610036

机载火控雷达是战斗机主要的火力引导单元,因此在机载电子战领域中,机载火控雷达就是最主要的对抗对象。其中识别机载火控雷达的工作模式则是电子战的工作重点和难点。本文分析了机载火控雷达的基本工作原理和波形特性,通过对机载火控... 详细信息

机载火控雷达是战斗机主要的火力引导单元,因此在机载电子战领域中,机载火控雷达就是最主要的对抗对象。其中识别机载火控雷达的工作模式则是电子战的工作重点和难点。本文分析了机载火控雷达的基本工作原理和波形特性,通过对机载火控雷达各种工作状态的数据分析,从工程意义上提出了基于机载火控雷达的工作模式识别和编队飞机识别的包络分析法。该方法通过暗室辐射实验验证,正确识别出了机载火控雷达的扫描、跟踪、SAM状态。实验证明该方法切实可行。

关键词：机载火控雷达工作模式识别

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