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A VIBRATION RECOGNITION METHOD BASED ON DEEP LEARNING AND SIGNAL PROCESSING

工程力学 2021年第4期38卷 230-246页

作者： CHENG Zhi-gang LIAO Wen-jie CHEN xing-yu lu xin-zheng Civil Engineering Department Tsinghua UniversityBeijing 100084China Beijing Engineering Research Center of Steel and Concrete Composite Structures Tsinghua UniversityBeijing 100084China Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry Tsinghua UniversityBeijing 100084China

Effective vibration recognition can improve the performance of vibration control and structural damage detection and is in high demand for signal processing and advanced ***-processing methods can extract the potent time-frequency-domain characteristics of signals;however,the performance of conventional characteristics-based classification needs to be *** used deep learning algorithms(e.g.,convolutional neural networks(CNNs))can conduct classification by extracting high-dimensional data features,with outstanding ***,combining the advantages of signal processing and deep-learning algorithms can significantly enhance vibration recognition performance.A novel vibration recognition method based on signal processing and deep neural networks is proposed ***,environmental vibration signals are collected;then,signal processing is conducted to obtain the coefficient matrices of the time-frequency-domain characteristics using three typical algorithms:the wavelet transform,Hilbert-Huang transform,and Mel frequency cepstral coefficient extraction ***,CNNs,long short-term memory(LSTM)networks,and combined deep CNN-LSTM networks are trained for vibration recognition,according to the time-frequencydomain ***,the performance of the trained deep neural networks is evaluated and *** results confirm the effectiveness of the proposed vibration recognition method combining signal preprocessing and deep learning.

关键词： vibration recognition signal processing time-frequency-domain characteristics convolutional neural network(CNN) long short-term memory(LSTM)network

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Microalbuminuria associated with systolic blood pressure and arterial compliance in Chinese metabolic syndrome patients

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Chinese Medical Journal 2007年第16期120卷 1395-1399页

作者： LI xin-li XU Qiong lu xin-zheng ZHANG Hai-feng ZHOU Yan-li CAO Ke-jiang HUANG Jun Department of Cardiology First Aftiliated Hospital of Nanjing Medical University Nanjing 210029 China

Background There is significant evidence showing that microalbuminuria and arterial compliance are sensitive markers for early cardiovascular diseases. However, whether microalbuminuria is associated with reduced arterial compliance in Chinese metabolic syndrome （MS） patients remains unknown. Methods According to the definition of MS proposed by ATPⅢ in 2001, USA, subjects （n=362） were divided into three groups according to the number of risk factors： group 1 （control）, group 2 （medium, 〈 3 risk factors） and group 3 （MS, ≥ 3 risk factors）. Both large artery compliance （C1） and small artery compliance （C2） were measured with the CVProfilor DO-2020 Cardiovascular Profiling System, and microalbuminuria was evaluated with the ratio of albumin to urine creatinine. Results （1） As C1 and C2 levels elasticity decreased, albumin creatinine ratio （ACR） and the prevalence of microalbuminuria increased within those groups with MS risk factors. C1 and C2 were negatively correlated with the ranking of MS risk factors, ACR was positively correlated with the ranking of MS risk factors （all P〈0.05）. （2） Subjects were also categorized into a microalbuminuria group and a normal group, C1 and C2 in the microalbuminuria group were lower than in the normal group. （3） Multivariate regression analysis showed that increased systolic blood pressure （SBP） and reduced arterial compliance were the main risk factors for microalbuminuria in the MS group. Conclusions The risk of developing microalbuminuria was higher in the subjects with multiple metabolic abnormalities. Increased systolic blood pressure and reduced arterial compliance may be the main predictors for microalbuminuria in MS.

关键词： metabolic syndrome microalbuminuria arterial elasticity

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Coronary spasm, a pathogenic trigger of vulnerable plaque rupture

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Chinese Medical Journal 2011年第23期124卷 4071-4078页

作者： WANG Li-xin lu Shu-zheng ZHANG Wei-jun SONG Xian-tao CHEN Hui ZHANG Li-jie Department of Cardiology Beijing Anzhen Hospital Capital University of Medical Sciences Beijing 100029 China

Objective This coronary artery spasm review aimed to explore the most possible pathogenic trigger mechanism of vulnerable plaque rupture. Data sources Data used in this coronary artery spasm review were mainly from Medline and Pubmed in English. Study selection These reports from major review on coronary artery spasm .and these research included coronary artery conception, pathogenesis of spasm, mechanisms of plaque rupture, epidemiological evidence, clinical manifestation and the relationship between coronary artery spasm and vulnerable plaque rupture. Results Coronary artery spasm is somehow related to the presence of atherosclerotic intima disease in the coronary artery. However, chronic low-grade inflammation causes coronary vessel smooth muscle cell hypersensitivity, which can directely cause coronary artery spasm. Myocardial infarction and sudden cardiac death may be initiated by a sudden intense localized contraction of coronary artery smooth muscle. Conclusion Coronary artery spasm may be one trigger that can initiate and exacerbate vulnerable plaque rupture.

关键词： coronary spasm vulnerable plaque rupture pathogenic trigger

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INFluENCE OF DAMPING MODELS ON DYNAMIC ANALYSES OF A BASE-ISOLATED COMPOSITE STRUCTURE UNDER EARTHQUAKES AND ENVIRONMENTAL VIBRATIONS

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工程力学 2022年第3期39卷 201-211页

作者：费一凡田源黄羽立陆新征 Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry Department of Civil EngineeringTsinghua UniversityBeijing 100084China

Structural design simultaneously governed by earthquakes and environmental vibrations has received a lot of attention in recent ***-isolated composite structures are typically used in the above-mentioned structural *** corresponding analysis involves validating structural safety under earthquakes and human comfort under environmental vibrations through a time-history ***,a reasonable damping model is *** this work,the representatives of viscous damping model and rate-independent damping model,namely the Rayleigh damping model and uniform damping model,were adopted to investigate the influence of damping models on the time-history analysis of such structural *** energy dissipation characteristics of the above-mentioned damping models were illustrated via a dynamic test of recycled aggregate concrete specimens.A case study was performed on a base-isolated steelconcrete composite *** dynamic responses under the excitation of earthquakes and environmental vibrations were compared using different damping *** uniform damping model was found to be more flexible than the Rayleigh damping model in dealing with excitations with different frequency *** uniform damping model is both theoretically advantageous and easy to use,demonstrating its potential in dynamic analysis of structures designed simultaneously governed by earthquakes and environmental vibrations.

关键词： seismic and environmental vibration analysis Rayleigh damping model uniform damping model seismic isolation composite structure

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AN EFFICIENT ASSESSMENT METHOD FOR INTELLIGENT DESIGN RESULTS OF SHEAR WALL STRUCTURE BASED ON MECHANICAL PERFORMANCE,MATERIAL CONSUMPTION,AND EMPIRICAL RULES

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工程力学 2023年第12期40卷 148-159页

作者：覃思中廖文杰林元庆陆新征 Department of Civil Engineering Tsinghua UniversityBeijing 100084China China Nuclear Power Engineering Co. Ltd Zhengzhou BranchZhengzhou 450052China

Efficient methods for incorporating engineering experience into the intelligent generation and optimization of shear wall structures are lacking,hindering intelligent design performance assessment and *** study introduces an assessment method used in the intelligent design and optimization of shear wall structures that effectively combines mechanical analysis and formulaic encoding of empirical ***,the critical information about the structure was extracted through data ***,an empirical rule assessment method was developed based on the engineer's experience and design standards to complete a preliminary assessment and screening of the ***,an assessment method based on mechanical performance and material consumption was used to compare different structural schemes ***,the assessment effectiveness was demonstrated using a typical *** to traditional assessment methods,the proposed method is more comprehensive and significantly more efficient,promoting the intelligent transformation of structural design.

关键词： shear wall structure structural assessment data structuring intelligent design structural optimization

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祝贺《工程力学》创刊40周年及《工程力学》近年来发展情况简报

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工程力学 2024年第10期41卷 I0009-I0016页

作者：陆新征《工程力学》编辑部

《工程力学》于1984年10月创刊,至今已走过40年的历程。《工程力学》的发展,离不开中国科协、中国力学学会、清华大学等上级单位,以及各级领导和组织的长期关怀与帮助,离不开历届编委会、以及广大作者、审稿人和读者的大力支持。特别是... 详细信息

《工程力学》于1984年10月创刊,至今已走过40年的历程。《工程力学》的发展,离不开中国科协、中国力学学会、清华大学等上级单位,以及各级领导和组织的长期关怀与帮助,离不开历届编委会、以及广大作者、审稿人和读者的大力支持。特别是陈祥福、龙驭球、崔京浩、袁驷等历任主编对《工程力学》期刊的发展起到了至关重要的核心作用。

关键词：中国科协中国力学学会上级单位情况简报审稿人历届编委核心作用《工程力学》

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TEM microstructure of rapidly solidified Mg-6Zn-1Y-1Ce alloy

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Transactions of Nonferrous Metals Society of China 2012年第4期22卷 786-792页

作者：杨文朋郭学锋卢正欣河南理工大学材料科学与工程学院焦作454000 西安理工大学材料科学与工程学院西安710048

Rapidly solidified（RS） Mg-6Zn-1Y-1Ce ribbons were prepared by single roller melt-spinning *** electron microscopy and energy dispersive X-ray spectroscopy were employed to characterize the microstructure of RS *** results show that there is high density of particles distributed within grains and at grain boundaries in the region near wheel *** particle density is decreased in the middle region and free surface *** alloy is predominantly composed of supersaturated--Mg solid solution,T phase and W phase;meanwhile,a few icosahedral quasicrystalline and Mg4Zn7 particles are also *** T phase is confirmed having a body-centered orthorhombic structure that is transformed from the body-centered tetragonal structure Mg12Ce phase due to the partial substitution of Mg atoms by Zn.

关键词： Mg-6Zn-1Y-1Ce alloy rapid solidification T phase icosahedral quasicrystalline Mg4Zn7 phase W phase

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往复荷载下钢筋混凝土柱受力性能的数值模拟

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工程力学 2007年第12期24卷 76-81页

作者：汪训流陆新征叶列平清华大学土木工程系北京100084

准确预测地震荷载下钢筋混凝土柱的受力性能,对评估震后混凝土框架结构及桥梁结构的安全性和震害损失具有重要意义。由于复杂的材料性能和受力行为,地震作用下钢筋混凝土柱受力性能的准确计算目前仍需主要借助数值模拟,并且对数值模型... 详细信息

准确预测地震荷载下钢筋混凝土柱的受力性能,对评估震后混凝土框架结构及桥梁结构的安全性和震害损失具有重要意义。由于复杂的材料性能和受力行为,地震作用下钢筋混凝土柱受力性能的准确计算目前仍需主要借助数值模拟,并且对数值模型中混凝土和钢筋材料的滞回本构关系提出了更高的精度要求。该文基于纤维分析模型,采用更加完善的反复荷载下钢筋和混凝土的本构,编制了可精确分析钢筋混凝土杆系结构及构件在往复荷载下受力性能的计算程序,并对不同轴压比和不同配筋率的2根压弯柱试件进行了数值模拟,计算结果与试验结果吻合良好。

关键词：纤维模型往复荷载混凝土柱滞回关系数值分析

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中美高层钢筋混凝土框架-核心筒结构抗震设计对比

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工程力学 2015年第6期32卷 52-61页

作者：李梦珂卢啸陆新征叶列平清华大学土木工程系北京100084 北京交通大学土木建筑工程学院北京100044

为综合对比中美抗震设计规范体系的总体效果,根据美国太平洋地震工程研究中心(PEER)给出的典型高层钢筋混凝土框架-核心筒结构案例的设计结果,采用中国规范对其进行了对比设计研究,详细分析了按照中、美规范设计得到的结构构件尺寸、动... 详细信息

为综合对比中美抗震设计规范体系的总体效果,根据美国太平洋地震工程研究中心(PEER)给出的典型高层钢筋混凝土框架-核心筒结构案例的设计结果,采用中国规范对其进行了对比设计研究,详细分析了按照中、美规范设计得到的结构构件尺寸、动力特性、设计地震作用和材料用量。并建立了中美两个结构的弹塑性有限元模型,初步研究了二者的抗震性能。通过研究发现,中美抗震设计方法存在较大差异。该研究中,在相同地震危险性情况下,我国规范反应谱的设计地震作用较大,并且我国规范对结构层间位移角的限制比较严格,二者使得按照中国规范设计的结构其设计地震作用以及材料用量均显著高于美方设计结果。但中美设计方案在不同强度地震作用下的抗震性能基本相当。该文对比结果可供我国高层建筑抗震设计研究参考。

关键词：钢筋混凝土框架-核心筒结构美国规范中国规范抗震设计数值模拟

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银屑病与肾脏疾病的相关性研究

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临床皮肤科杂志 2014年第7期43卷 406-408页

作者：侯麦花卢新政南京医科大学第一附属医院皮肤性病科江苏南京210029 南京医科大学第一附属医院心脏科江苏南京210029

目的:研究银屑病患者肾脏功能的变化情况。方法:53例银屑病患者,其中男38例,女15例,平均年龄(46±12)岁,以年龄和性别相匹配的健康者53例个体为对照组。用银屑病皮损面积和严重程度指数(PASI)评估银屑病的严重程度。所有患者及对照组均... 详细信息

目的:研究银屑病患者肾脏功能的变化情况。方法:53例银屑病患者,其中男38例,女15例,平均年龄(46±12)岁,以年龄和性别相匹配的健康者53例个体为对照组。用银屑病皮损面积和严重程度指数(PASI)评估银屑病的严重程度。所有患者及对照组均行尿液分析包括尿常规及尿沉渣镜检、24 h尿蛋白定量及尿微量白蛋白。其中尿微量白蛋白>30mg/L认为病理性白蛋白尿,对尿液检查异常的银屑病患者进行肾活检。结果:①银屑病患者和对照组的尿常规分析及镜检差异均无统计学意义(P>0.05);两组间的平均24 h蛋白尿、尿微量白蛋白差异均无统计学意义(P>0.05);但与对照组相比,银屑病患者病理性白蛋白尿的发生率显著增加(分别为24%和2%,P<0.01)。②银屑病患者的PASI分数与24 h白蛋白尿显著相关(r=0.458,P<0.01)。其中9例银屑病患者有肾功能异常,4例进行了肾活检,证实2例为肾小球肾炎,且均为系膜增殖性肾小球肾炎。结论:银屑病患者中肾脏异常并不常见,而病理性白蛋白尿发生率显著增加,且与银屑病的严重程度相关,提示银屑病患者可能存在早期肾功能损害。

关键词：尿微量白蛋白银屑病肾功能

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