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Review and comparison of methods and benchmarks for automatic modal identification based on stabilization diagram

Journal of Traffic and Transportation Engineering(English Edition) 2024年第2期11卷 209-224页

作者： Min He Peng liang Jiuxian Liu zhiqiang liang School of Architecture and Civil Engineering Xi'an University of Science and TechnologyXi'an 710064China School of Highway Chang'an UniversityXi'an 710064China

Automatic modal identification via automatically interpreting the stabilization diagram provides key technique in bridge structural health *** paper reviews the progress in the area of automatic modal identification based on interpreting the stabilization *** whole identification process is divided into four steps from establishing the stabilization diagram to removing the outliers in the identification *** criteria and algorithms used in each step in the existing studies are carefully summarized and *** between typical methods in cleaning and interpreting the stabilization diagram are also *** structure benchmarks used in the existing studies to validate the proposed automatic modal identification methods are also *** on the review and comparison,the specific ratio method for cleaning the stabilization diagram,the hierarchical clustering method for interpreting the stabilization diagram and the adjusted boxplot for removing the outliers in the identification results are the most suitable methods for each *** key point of automatic modal identification based on interpreting the stabilization diagram has also discussed,and it is recommended to pay more attention to cleaning the stabilization *** study about automatic modal identification under situation with very few sensors deployed should be more *** review aims to help researchers and practitioners in implementing existing automatic modal identification algorithms effectively and developing more suitable and practical methods for civil engineering structures in the future.

关键词： Bridge structural health monitoring Automatic modal identification Stabilization diagram Eriteria and methods Real structure benchmarks

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Early chatter identification based on optimized VMD with multi-band information fusion and compression method in robotic milling process

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Chinese Journal of Aeronautics 2024年第6期37卷 464-484页

作者： Sichen CHEN zhiqiang liang Yuchao DU Zirui GAO Haoran ZHENG Zhibing LIU Tianyang QIU Xibin WANG School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China Beijing Institute of Technology Chongqing Innovation Center Chongqing 401120China

Undesirable self-excited chatter has always been a typical issue restricting the improvement of robotic milling quality and *** chatter identification based on processing signals can prompt operators to adjust the machining process and prevent chatter *** with the traditional machine tool,the uncertain multiple chatter frequency bands and the band-moving of the chatter frequency in robotic milling process make it more challenging to extract chatter *** paper proposes a novel method of chatter identification using optimized variational mode decomposition(OVMD)with multi-band information fusion and compression technology(MT).During the robotic milling process,the number of decomposed modes k and the penalty coefficient a are optimized based on the dominant component of frequency scope partition and fitness of the mode center ***,the mayfly optimization algorithm(MA)is employed to obtain the global optimal parameter *** order to conquer information collection about the uncertain multiple chatter frequency bands and the band-moving of the chatter frequency in robotic milling process,MT is presented to reduce computation and extract signal ***,the cross entropy of the image(CEI)is proposed as the final chatter indicator to identify the chatter *** robotic milling experiments are carried out to verify the proposed method,and the results show that it can distinguish the robotic milling condition by extracting the uncertain multiple chatter frequency bands and overcome the band-moving of the chatter frequency in robotic milling process.

关键词： Robotic milling Chatter detection Variational mode decomposition Information fusion and compression Chatter featur

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Enhancing the Efficiency and Durability of Perovskite Solar Cells by Donor-Acceptor Covalent Organic Framework with Thiazolo[5,4-d]thiazole Unit

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CCS Chemistry 2024年第7期6卷 1721-1730页

作者： Liyi Yao Shuainan Liu Lin Li Bangdi Ge Wenyu Jiao Siyu Zong Xiaowei Song Donglei Zhou zhiqiang liang State Key Lab of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012 State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012 Electron Microscopy Center Jilin UniversityChangchun 130012

Donor-Acceptor(D-A)alignment is considered a productive strategy to improve the charge separation efficiency of covalent organic frameworks(COFs)and enhance the charge-transfer yield(CTY)of ***,organic molecules containing heteroatoms can produce coordination interaction with PbI2 of perovskite precursor to affect the crystallization process,thereby impeding the decomposition and improving the stability of perovskite ***,a thiazolo[5,4-d]thiazole(TZ)-based D-A type COF_(TPDA-TZDA) was designed and synthesized from N,N,N′,N′-tetrakis(4-aminophenyl)-1,4-benzenediamine(TPDA)and 4,4′-(thiazolo[5,4-d]thiazole-2,5-diyl)dibenzaldehyde(TZDA).Upon incorporation into the FAPbI3 layer,COF_(TPDA-TZDA) not only restrained the perovskite defects and enhanced the grain size of perovskite films through the coordination effect of the N atoms of TZDA but also ameliorated the charge transport within the perovskite film,which was the benefit of the D-A structure of COF_(TPDA-TZDA).As a result,incorporation of COF_(TPDA-TZDA) into the perovskite solar cells(PSCs)led to a remarkable power conversion efficiency(PCE)of up to 23.51%.Furthermore,even after being stored in high relative humidity(RH≈60%)for 480 h,these PSCs maintained over 90.55%of their original *** work sets the foundation for the development of highly efficient and stable PSCs by utilizing TZ-based D-A type COFs.

关键词： thiazolo[5,4-d]thiazole perovskite solar cells donor-acceptor covalent organic frameworks charge-transfer

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Mitogenomic phylogeny,biogeography,and cryptic divergence of the genus Silurus(Siluriformes:Siluridae)

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Zoological Research 2024年第4期45卷 711-723页

作者： Weitao Chen Nicolas Hubert Yuefei Li Shuli Zhu Jun Wang Denggao Xiang Shang Gao Chunni Kou Jilong Wang Tai Wang zhiqiang liang Junjie Wu Xinhui Li Jie Li Pearl River Fisheries Research Institute Chinese Academy of Fishery SciencesGuangzhouGuangdong 510380China China Key Laboratory of Aquatic Animal Immune Technology of Guangdong Province GuangzhouGuangdong 510380China Key Laboratory of Prevention and Control for Aquatic Invasive Alien Species Ministry of Agriculture and Rural AffairsGuangzhouGuangdong 510380China Scientific Observing and Experimental Station of National Fisheries Resources and Environment GuangzhouGuangdong 510380China Institut de Recherche pour le Développement MontpellierUMR 226 ISEM(UM-CNRS-IRD)France State Key Laboratory of Eco-hydraulic in Northwest Arid Region of China Xi’an University of TechnologyXi’anShaanxi 710048China Heilongjiang River Fisheries Research Institute Chinese Academy of Fishery SciencesHarbinHeilongjiang 150076China Gansu Fisheries Research Institute LanzhouGansu 730030China Hunan Fisheries Science Institute ChangshaHunan 410153China Yunnan Institute of Fishery Sciences Research KunmingYunnan 650111China

The genus Silurus,an important group of catfish,exhibits heterogeneous distribution in Eurasian freshwater *** group includes economically important and endangered species,thereby attracting considerable scientific *** this interest,the lack of a comprehensive phylogenetic framework impedes our understanding of the mechanisms underlying the extensive diversity found within this ***,we analyzed 89 newly sequenced and 20 previously published mitochondrial genomes(mitogenomes)from 13 morphological species to reconstruct the phylogenetic relationships,biogeographic history,and species diversity of *** phylogenetic reconstructions identified eight clades,supported by both maximum-likelihood and Bayesian ***-based species delimitation analyses yielded multiple molecular operational taxonomic units(MOTUs)in several taxa,including the Silurus asotus complex(four MOTUs)and Silurus microdorsalis(two MOTUs),suggesting that species diversity is underestimated in the genus.A reconstructed time-calibrated tree of Silurus species provided an age estimate of the most recent common ancestor of approximately 37.61 million years ago(Ma),with divergences among clades within the genus occurring between 11.56 Ma and 29.44 Ma,and divergences among MOTUs within species occurring between 3.71 Ma and 11.56 *** reconstructions suggested that the ancestral area for the genus likely encompassed China and the Korean Peninsula,with multiple inferred dispersal events to Europe and Central and Western Asia between 21.78 Ma and 26.67 Ma and to Japan between 2.51 Ma and 18.42 *** factors such as the Eocene-Oligocene extinction event,onset and intensification of the monsoon system,and glacial cycles associated with sea-level fluctuations have likely played significant roles in shaping the evolutionary history of the genus Silurus.

关键词： Maximum likelihood Bayesian inferences Ancestral area estimation Cryptic diversity Dispersal pathways Mitogenomes Sea levels

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基于改进Faster R-CNN与U-Net算法的桥梁病害识别与量化方法

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东南大学学报（自然科学版） 2024年第3期54卷 627-638页

作者：乔朋梁志强段长江马晨王思龙狄谨长安大学建筑工程学院西安710061 长安大学公路学院西安710061 重庆大学土木工程学院重庆400045

为实现桥梁病害检测的自动化,对基于图像处理技术的混凝土桥梁表观病害的智能识别和尺寸确定方法展开研究.提出基于改进Faster R-CNN算法的病害识别方法,利用K均值聚类和遗传算法对区域候选网络锚框进行优化设计;以裂缝预测区域为基础,... 详细信息

为实现桥梁病害检测的自动化,对基于图像处理技术的混凝土桥梁表观病害的智能识别和尺寸确定方法展开研究.提出基于改进Faster R-CNN算法的病害识别方法,利用K均值聚类和遗传算法对区域候选网络锚框进行优化设计;以裂缝预测区域为基础,提出ResNet34结合U-Net的裂缝形态提取方法,并结合裂缝形态学研究了裂缝像素宽度和长度的确定方法.结果表明:锚框优化设计可改进Faster R-CNN算法的表观病害识别效果,5类常见病害的预测准确率、召回率、平均精确率分别由68.40%、69.87%、74.64%提升到85.40%、83.59%、83.72%;利用病害预测框,结合改进U-Net算法的裂缝像素尺寸计算,可实现裂缝病害尺寸的自动测量;基于改进Faster R-CNN和改进U-Net的方法可实现混凝土桥梁常见病害的智能识别和尺寸量化,从而提高桥梁病害检测效率并促进桥梁技术状况评定的智能化.

关键词：桥梁工程表观病害识别裂缝尺寸确定改进Faster R-CNN 改进U-Net

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运动学对线膝单髁置换术的研究进展

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中华骨与关节外科杂志 2024年第9期17卷 851-857页

作者：李翀曾纪洲张宽梁志强首都医科大学附属北京潞河医院骨关节外科北京101149 首都医科大学生物医学工程学院北京100069

膝单髁置换术后的翻修率和膝关节功能很大程度上与力学对线相关。近几年,越来越多的研究者认为传统的机械学对线并未充分考虑到患者的个性化差异,而只是根据胫骨和股骨的机械轴进行截骨和假体植入,可能并非最佳的对线技术。运动学对线... 详细信息

膝单髁置换术后的翻修率和膝关节功能很大程度上与力学对线相关。近几年,越来越多的研究者认为传统的机械学对线并未充分考虑到患者的个性化差异,而只是根据胫骨和股骨的机械轴进行截骨和假体植入,可能并非最佳的对线技术。运动学对线作为一种新兴的对线技术,通过恢复两条运动轴,从三维空间恢复人体自然的关节面方向和膝关节生理软组织平衡,或将成为膝单髁置换术后降低翻修率、提升患者满意度的突破口。本文就运动学对线膝单髁置换术的优点、存在问题和前沿探索进行综述。

关键词：膝单髁置换术对线技术运动学对线机械学对线

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考虑不确定性的隧道工程稳定性分析与可靠性优化设计

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安全与环境工程 2024年第3期31卷 103-109页

作者：梁志强郑民总李剑朱尚明中国水利水电第十四工程局有限公司云南昆明650041 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室湖北武汉430071 湖北省交通规划设计院股份有限公司湖北武汉430051

不确定性是岩石工程的一个重要特性,对岩石工程的稳定分析、设计与安全施工具有重要影响,而传统的确定性分析与优化设计方法不能考虑岩石工程的不确定性。针对隧道工程中的不确定性,将可靠性理论、实验设计、数值模拟与响应面等方法有... 详细信息

不确定性是岩石工程的一个重要特性,对岩石工程的稳定分析、设计与安全施工具有重要影响,而传统的确定性分析与优化设计方法不能考虑岩石工程的不确定性。针对隧道工程中的不确定性,将可靠性理论、实验设计、数值模拟与响应面等方法有机结合,提出一种考虑不确定性的隧道工程稳定性分析与可靠性优化设计方法。该方法通过建立考虑不确定性的隧道工程稳定性分析模型,在此基础上结合可靠性优化设计,建立了考虑不确定性的隧道工程优化设计方法,并将提出的方法结合隧道工程算例进行了分析。结果表明,该方法对隧道工程设计、稳定性分析以及风险分析具有显著指导意义,为隧道工程的不确定性分析提供了一条有效的途径。

关键词：隧道工程不确定性稳定性分析可靠性优化设计

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Science China(Physics,Mechanics & Astronomy) 2007年第3期50卷 267-280页

作者： XIE BoSun ZHONG XiaoLi RAO Dan liang zhiqiang Acoustics Laboratory School of PhysicsSouth China University of TechnologyGuangzhou 510641China

Based on the measurements from 52 Chinese subjects (26 males and 26 females), a high-spatial-resolution head-related transfer function (HRTF) database with corre- sponding anthropometric parameters is established. By using the database, cues relating to sound source localization, including interaural time difference (ITD), interaural level difference (ILD), and spectral features introduced by pinna, are analyzed. Moreover, the statistical relationship between ITD and anthropometric parameters is estimated. It is proved that the mean values of maximum ITD for male and female are significantly different, so are those for Chinese and western sub- jects. The difference in ITD is due to the difference in individual anthropometric parameters. It is further proved that the spectral features introduced by pinna strongly depend on individual; while at high frequencies (f≥ 5.5 kHz), HRTFs are left-right asymmetric. This work is instructive and helpful for the research on bin- aural hearing and applications on virtual auditory in future.

关键词： head-related transfer function measurement interaural time difference binaural hearing

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风阻与电磁阻皮划艇测功仪专项训练的适用性评估

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上海体育大学学报 2024年第5期48卷 52-60页

作者：梁志强闫家祥李楠宋万翔李建设宁波大学大健康研究院浙江宁波315211 上海体育大学运动健康学院上海200438 浙江水电水利学院体军部浙江杭州310018 宁波大学体育学院浙江宁波315211 浙江经济职业技术学院文化艺术学院浙江杭州310018

目的皮划艇测功仪是皮划艇运动员训练的重要工具,对目前最常用的风阻和电磁阻皮划艇测功仪在一线训练中的适用性进行对比,为陆上专项训练选择何种阻力方式的测功仪提供建议。方法按从事项目对31名皮划艇运动员进行分类,分别在对应的风... 详细信息

目的皮划艇测功仪是皮划艇运动员训练的重要工具,对目前最常用的风阻和电磁阻皮划艇测功仪在一线训练中的适用性进行对比,为陆上专项训练选择何种阻力方式的测功仪提供建议。方法按从事项目对31名皮划艇运动员进行分类,分别在对应的风阻和电磁阻皮划艇测功仪上完成200m、500m和1000m全力划,实时采集运动时间、分段时间、桨频、速度和功率指标数据。结果在稳定性方面,电磁阻皮艇、划艇测功仪及风阻皮艇测功仪的运行指标稳定,可作为比较理想的陆上专项体能训练设备;在相关性方面,风阻和电磁阻皮划艇测功仪运动时间与水上运动时间均呈中低度相关,不适合用于专项技术训练;在差异性方面,2种皮艇测功仪的主要差异为长距离训练的功率指标,2种划艇测功仪的主要差异为中短距离训练的功率指标,这种差异均与阻力的产生方式与表现形式相关。结论风阻和电磁阻皮划艇测功仪均可作为陆上专项体能训练设备,但不适合作为专项技术训练设备。

关键词：风阻力电磁阻力测功仪皮艇划艇运动训练

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Dynamic subsidence basins in coal mines based on rock mass rheological theory

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Mining Science and Technology 2011年第3期21卷 333-335页

作者： Yang Yu Gong zhiqiang liang Bing School of Civil Engineering and Transportation Liaoning Technical University Fuxin 123000 China

In order to investigate the surface deformation caused by coal mining and to reduce environmental damage, more accurate information of dynamic subsidence basins, caused by coal mining, is needed. Based on theological theory, we discuss surface deformation mechanism of dynamic subsidence on the assumption that both the roof and the coal seam are visco-elastic media, put forward the idea that the principle of surface deformation is similar to that of roofs, except for their parameters. Therefore, a surface deforma- tion equation can be obtained, given the equation of the roof deformation *** using a HIM rhe- ological model. In the end, we apply the equation of surface deformation as a practical subsidence prediction in a coal mine. Given the theologic properties of a rock mass, the results of our research of a dynamic subsidence basin can predict the development of surface deformation as a function of time, which is more important than the ultimate subsidence itself. The results indicate that using rheological theory to calculate the deformation of a dynamic subsidence basin is suitable and provides some reference for surface deformation of dynamic subsidence basins.

关键词： Coal mining subsidenceDynamic basinRheological theorie sHiM theological model

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