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Structural Durability & Health Monitoring 2024年第6期18卷 763-783页

作者： Yadong Xu Weixing Hong Mohammad Noori wael a.altabey Ahmed Silik Nabeel S.D.Farhan Nanjing Highway Development Center Changzhou211106China Nanjing Zhixing Information Technology Co. Ltd.Nanjing210000China Department of Mechanical Engineering California Polytechnic State UniversitySan Luis ObispoCA 93405USA Department of Mechanical Engineering Faculty of EngineeringAlexandria UniversityAlexandria21544Egypt Department of Civil Engineering Nyala UniversityP.O.Box 155NyalaSudan School of Civil Engineering University of LeedsLeedsLS29JTUK

This study introduces an innovative“Big Model”strategy to enhance Bridge Structural Health Monitoring(SHM)using a Convolutional Neural Network(CNN),time-frequency analysis,and fine element *** ensemble methods,collaborative learning,and distributed computing,the approach effectively manages the complexity and scale of large-scale bridge *** CNN employs transfer learning,fine-tuning,and continuous monitoring to optimize models for adaptive and accurate structural health assessments,focusing on extracting meaningful features through time-frequency *** integrating Finite Element Analysis,time-frequency analysis,and CNNs,the strategy provides a comprehensive understanding of bridge *** diverse sensor data,sophisticated feature extraction,and advanced CNN architecture,the model is optimized through rigorous preprocessing and hyperparameter *** approach significantly enhances the ability to make accurate predictions,monitor structural health,and support proactive maintenance practices,thereby ensuring the safety and longevity of critical infrastructure.

关键词： Structural Health Monitoring(SHM) bridges big model Convolutional Neural Network(CNN) Finite Element Method(FEM)

An Exact Solution for Acoustic Simulation Based Transmission Loss Optimization of Double-Chamber Silencer

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Sound & Vibration 2020年第4期54卷 215-224页

作者： wael a.altabey International Institute for Urban Systems Engineering(IIUSE) Southeast UniversityNanjing210096China Department of Mechanical Engineering Faculty of EngineeringAlexandria UniversityAlexandria21544Egypt

The optimization of the acoustic silencer volume is very important to develop it and to get high-performance,the importance of the silencer was appeared in industrial field to eliminate the noise of the duct by efficient and economical *** main goal of this research is to optimize the transmission loss(TL)by analytical method of the Double-Chamber Silencer(DCS),the TL has been selected as the main parameter in silencer because it does not based on the source or the termination *** we calculated the power transmission coefficient(PTC)and the TL of an acoustic silencer,then used the Lagrange method to optimize the silencer *** calculation of silencer data is obtained by solving the governing equations in commercial software Matlab®.A several calculations for different silencer length at many frequency ranges were performed ***,this research supports the efficient and rapid techniques for DCS optimal design under narrow *** results show that the acoustic TL is maximized at the desired frequency.

关键词： Acoustic silencer/filter double-chamber silencer transmission loss power transmission optimization

Reaching law based sliding mode control for a frame structure under seismic load

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Earthquake Engineering and Engineering Vibration 2021年第3期20卷 727-745页

作者： Ying Zhao Mohammad Noori wael a.altabey International Institute for Urban Systems Engineering Southeast UniversityNanjing 210096China Department of Mechanical Engineering California Polytechnic State UniversitySan Luis ObispoCA 93405USA Department of Mechanical Engineering Faculty of EngineeringAlexandria UniversityAlexandria 21544Egypt

Implementation of efficient vibration control schemes for seismically excited structures is becoming more and more important in recent *** this study,the influence of different control schemes on the dynamic performance of a frame structure excited by El Centro wave,with an emphasis on reaching law based control strategies,is *** law refers to the reachable problem and criteria for the sliding state of a control *** reaching laws are designed to present different sliding mode control strategies by incorporating a state space model that describes structural dynamic characteristics of a frame *** intact and damaged structures are studied by using the aforementioned control *** influence of different structural damage extents,control locations and reaching law based control methods are further *** results show that the structure can be well controlled using the sliding mode strategy when the induced structural damage extent does not exceed the standard percentage for considering the structure was damaged,which is 20%reduction in structure stiffness,as reported in the *** control effectiveness is more satisfactory if the control location is the same as the direction of external ***,to study the chattering phenomenon of the sliding mode control method,approximation and detail components extracted from the phase plots of the sliding mode control system are compared via wavelet transform at different *** results show that for the same type of control law,the system behaves with similar chattering phenomenon.

关键词： reaching law sliding mode control state-space model phase plot 2-D wavelet transform

Experimental and Numerical Assessment on Seismic Performance of Earth Adobe Walls

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Structural Durability & Health Monitoring 2021年第2期15卷 103-123页

作者： Zele Li Mohammad Noori wael a.altabey International Institute for Urban Systems Engineering Southeast UniversityNanjing210096China Department of Mechanical Engineering California Polytechnic State UniversitySan Luis ObispoCA 93405USA Department of Mechanical Engineering Faculty of EngineeringAlexandria UniversityAlexandria21544Egypt

Earth buildings are common types of structures in most rural areas in all developing *** failure and destruction of these structures under seismic loads always result in loss of human lives and economic *** is an important load-bearing component of raw soil *** this paper,a novel approach is proposed to improve the strength and ductility of adobe *** types of analyses,material properties,mechanical properties,and dynamic properties,are carried out for the seismic performance assessment of the adobe *** performed studies include that,material properties of the earth cylinder block,mechanical properties of adobe walls under quasi-static loads,and dynamic performance of adobe walls excited by seismic *** investigation of material properties,eighteen cylindrical specimens with a diameter of 100 mm and a height of 110 mm were divided into three groups for compressive,tensile,and split pull strength tests,*** results of the three groups of tests showed that the yield strength ratios of compressive,tensile,and shear strength were about 1:0.3:*** order to study the performance of structural components,three 1/3 scale model raw soil walls with a dimension of 1,200 mm in width,1,000 mm in height,and 310 mm in thickness were tested under cyclic *** average wall capacity of the wall obtained by the test was about 13.5 kN and the average displacement angle was about 1/*** numerical simulation experiment is used to explore the mechanism of structural failure.A three-dimensional finite element model is established by choosing the material parameters based on the above test *** accuracy of the numerical simulation experiment is verified by simulation and comparison of the above quasi-static test ***,the collapse process of raw soil wall under a seismic wave is simulated for exploring the response and damage mechanism of *** on those systematically analyzed,some usef

关键词： Raw soil wall quasi-static experiment cylindrical specimen ANSYS/LS_DYNA collapse

Applying Neural Networks for Tire Pressure Monitoring Systems

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Structural Durability & Health Monitoring 2019年第3期13卷 247-266页

作者： Alex Kost wael a.altabey Mohammad Noori Taher Awad Mechanical Engineering Department California Polytechnic State UniversitySan Luis ObispoCA 93405USA International Institute for Urban Systems Engineering(IIUSE) Southeast UniversityNanjingChina Nanjing Zhixing Information Technology Co. Ltd.NanjingChina Mechanical Engineering Department Faculty of EngineeringAlexandria UniversityAlexandria21544Egypt

A proof-of-concept indirect tire-pressure monitoring system is developed using artificial neural networks to identify the tire pressure of a vehicle tire.A quarter-car model was developed with MATLAB and Simulink to generate simulated accelerometer output *** data are used to train and evaluate a recurrent neural network with long short-term memory blocks(RNN-LSTM)and a convolutional neural network(CNN)developed in Python with *** Optimization via SigOpt was used to optimize training and model *** predictive accuracy and training speed of the two models with various parameters are ***,future work and improvements are discussed.

关键词： RNN-LSTM CNN artificial neural networks tire pressure monitoring systems

A Deep Learning Based Approach for Response Prediction of Beam-like Structures

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Structural Durability & Health Monitoring 2020年第4期14卷 315-338页

作者： Tianyu Wang wael a.altabey Mohammad Noori Ramin Ghiasi International Institute for Urban Systems Engineering Southeast UniversityNanjing210096China Department of Mechanical Engineering F aculty of EngineeringAlexandria UniversityAlexandnia21544Egypt Department of Mechanical Engineeing Califomia Polytechnic State UniversitySan Luis ObispoCA93405USA

Beam-like structures arde a class of common but important structures in *** the past few centuries,extensive research has been carried out to obtain the static and dynamic response of beam-like *** build-ing the finite element model to predict the response of these structures has proven to be effective,it is not always suitable in all the application cases because of high computational time or lack of *** paper proposes a novel approach to predict the deflection response of beam-like structures based on a deep neural net-work and the governing differential equation of Euler-Bernoulli *** Prandtl-Ishlinskii model is introduced as an element of prediction model to simu-late the plasticity of this beam *** the application of the proposed approach is demonstrated through four numerical examples including linear elastic/ideal plastic beam under concentrated/sinusoidal load and elastic/plastic continues beam under seismic load to demonstrate a proof of concept for the effectiveness of this AI-based approach.

关键词： Beam-like structure surogate model deep neural network Prandtl-Ishl inski model

Comparative Analysis of Wavelet Transform for Time-Frequency Analysis and Transient Localization in Structural Health Monitoring

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Structural Durability & Health Monitoring 2021年第1期15卷 1-22页

作者： Ahmed Silik Mohammad Noori wael a.altabey Ramin Ghiasi Zhishen Wu International Institute for Urban Systems Engineering(IIUSE) Southeast UniversityNanjing210096China Department of Civil Engineering Nyala UniversityNyalaSudan Department of Mechanical Engineering California Polytechnic State UniversitySan Luis ObispoCA 93405USA Department of Mechanical Engineering Faculty of EngineeringAlexandria UniversityAlexandria21544Egypt

A critical problem facing data collection in structural health monitoring,for instance via sensor networks,is how to extract the main components and useful features for damage detection.A structural dynamic measurement is more often a complex time-varying process and therefore,is prone to dynamic changes in time-frequency *** extract the signal components and capture the useful features associated with damage from such nonstationary signals,a technique that combines the time and frequency analysis and shows the signal evolution in both time and frequency is *** analyses have proven to be a viable and effective tool in this *** transform(WT)can analyze different signal components and then comparing the characteristics of each signal with a resolution matched to its ***,the challenge is the selection of a proper wavelet since various wavelets with varied properties that are to analyze the same data may result in different *** article presents a study on how to carry out a comparative analysis based on analytic wavelet scalograms,using structural dynamic acceleration responses,to evaluate the effectiveness of various wavelets for damage detection in civil *** scalogram’s informative time-frequency regions are examined to analyze the variation of wavelet coefficients and show how the frequency content of a signal changes over time to detect transient events due to ***,damage-induced changes are tracked with time-frequency *** this aim,energy distribution and sharing information are *** undamaged and damaged simulated comparative results of a structure reveal that the damaged structure were shifted from the undamaged ***,the Bump wavelet shows the best results than the others.

关键词： Dynamic measurement wavelet selection continuous wavelet

A Fatigue Damage Model for FRP Composite Laminate Systems Based on Stiffness Reduction

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Structural Durability & Health Monitoring 2019年第1期13卷 85-103页

作者： Ying Zhao Mohammad Noori wael a.altabey Ramin Ghiasi Zhishen Wu International Institute for Urban Systems Engineering(IIUSE) Southeast UniversityNanjingChina Mechanical Engineering Department California Polytechnic State UniversitySan Luis ObispoCA 93405USA Mechanical Engineering Department Faculty of EngineeringAlexandria UniversityAlexandria21544Egypt Department of Civil Engineering Faculty of EngineeringUniversity of Sistan and BaluchestanZahedanIran

This paper introduces a stiffness reduction based model developed by the authors to characterize accumulative fatigue damage in unidirectional plies and(0/θ/0)composite laminates in fiber reinforced polymer(FRP)composite *** proposed damage detection model is developed based on a damage evolution mechanism,including crack initiation and crack damage progress in matrix,matrix-fiber interface and *** result demonstrates that the corresponding stiffness of unidirectional composite laminates is reduced as the number of loading cycles ***,three common models in literatures are presented and *** viscosity,Young’s modulus and ultimate tensile stress of composites are incorporated as key factors in this model and are modified in accordance with *** types of FRP composite property parameters,including Carbon Fiber Reinforced Polymer(CFRP),Aramid Fiber Reinforced Polymer(AFRP),Glass Fiber Reinforced Polymer(GFRP),and Basalt Fiber Reinforced Polymer(BFRP),are considered in this research,and a comparative parameter study of FRP unidirectional composite laminates with different off-angle plies using control variate method are *** is concluded that the relationship between the drop in stiffness and the number of cycles also shows three different regions,following the mechanism of damage of FRP composites and the matrix is the dominant factor determined by temperature,while fiber strength is the dominant factor that determine the reliability of composite.

关键词： FRP laminates fatigue damage model stiffness reduction thermal effect

Development of Features for Early Detection of Defects and Assessment of Bridge Decks

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Structural Durability & Health Monitoring 2023年第4期17卷 257-281页

作者： Ahmed Silik Xiaodong Wang Chenyue Mei Xiaolei Jin Xudong Zhou Wei Zhou Congning Chen Weixing Hong Jiawei Li Mingjie Mao Yuhan Liu Mohammad Noori wael a.altabey Nanjing Zhixing Information Technology Co. Ltd.NanjingChina Jiangsu Advance Transportation Institute NanjingChina Suzhou Highway Development Center SuzhouChina Guangdong Communications Group Co. Ltd.GuangzhouChina Department of Mechanical Engineering California Polytechnic State UniversitySan Luis ObispoCA93405USA School of Civil Engineering University of LeedsLeedsLS29JTUK Department of Civil Engineering Faculty of Engineering SciencesNyala UniversityNyala092Sudan Department of Mechanical Engineering Faculty of EngineeringAlexandria UniversityAlexandria21544Egypt

Damage detection is an important area with growing interest in mechanical and structural *** of the critical issues in damage detection is how to determine indices sensitive to the structural damage and insensitive to the surrounding environmental *** damage identification indices commonly focus on structural dynamic characteristics such as natural frequencies,mode shapes,and frequency *** study aimed at developing a technique based on energy Curvature Difference,power spectrum density,correlation-based index,load distribution factor,and neutral axis shift to assess the bridge deck *** addition to tracking energy and frequency over time using wavelet packet transform,in order to further demonstrate the feasibility and validity of the proposed technique for bridge condition assessment,experimental strain data measured from two stages of a bridge in the different intervals were *** comparative analysis results of the bridge in first and second stage show changes in the proposed feature *** is concluded,these changes in the values of the proposed features can be used to assess the bridge deck performance.

关键词： Structural health monitoring strain monitoring distribution factor wavelet packet transform

Practical seismic resilience evaluation and crisis management planning through GIS-based vulnerability assessment of buildings

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Earthquake Engineering and Engineering Vibration 2021年第1期20卷 25-37页

作者： Peyman Narjabadifam Ramin Hoseinpour Mohammad Noori wael altabey Department of Civil Engineering Faculty of EngineeringUniversity of Bonab***BonabIran Department of Mechanical Engineering California Polytechnic State UniversitySan Luis ObispoCA 93405USA International Institute for Urban Systems Engineering(IIUSE) Southeast UniversityNanjing 210096China Department of Mechanical Engineering Faculty of EngineeringAlexandria UniversityAlexandria21544Egypt

The objective of this paper is to demonstrate how assessment of seismic vulnerability can be effective in protection against *** are reported from a case study in a densely populated urban area near an active fault,utilizing practical methods and exact engineering *** factors were determined due to technical considerations,and a field campaign was performed to collect the required ***-criteria decision making was carried out by means of an analytical hierarchy process including a fuzzy *** scenarios were applied through an implicit vulnerability *** was utilized and the results were analyzed by classifying the state of vulnerability in levels as very low,low,moderate,high,and very *** resilience was evaluated as vulnerabilities below the moderate state,being about 40% in an intensity of 6 Mercalli and less than 10% in 10 *** is concluded that seismic resilience in the area studied is not acceptable,the area is vulnerable in the expected scenarios,and due to the high seismicity of the region,proper crisis management planning is required in parallel with attempts toward *** this regard,an emergency map was developed with reference to the assessed vulnerabilities.

关键词： seismic resilience crisis management vulnerability assessment earthquake retrofit AHP Expert Choice GIS