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Defence t.chnology（防务技术） 2020年第5期16卷 1019-1038页

作者： M.Vinyas D.Harursampat. t.nguyen-thoi Nonlinear Mult.funct.onal Composit.s Analysis and Design(NMCAD)Laborat.ry Department of Aerospace EngineeringIndian Institute of ScienceBangalore560012India Division of Comput.t.onal Mat.emat.cs and Engineering Institute for Computational ScienceTon Duc Thang UniversityHo Chi Minh CityViet Nam Facult. of Civil Engineering Ton Duc Thang UniversityHo Chi Minh CityViet Nam

t.is art.cle makes t.e first.at.empt.in assessing t.e influence of act.ve const.ained layer damping(ACLD)t.eat.ent.t.wards precise cont.ol of frequency responses of funct.onally graded skew-magnet.-elect.oelast.c(FGSMEE)plat.s by employing finit. element.*** mat.rials are funct.onally graded across t.e t.ickness of t.e plat. in t.rms of modest.power-law *** principal equat.ons of mot.on of FGSMEE are derived via Hamilt.n’s principle and solved using condensat.on *** effect.of ACLD pat.hes are modelled by following t.e complex modulus approach(CMA).Addit.onally,dist.nct.ve emphasis is laid t. evaluat. t.e influence of geomet.ical skewness on t.e at.enuat.on capabilit.es of t.e *** accuracy of t.e current.analysis is corroborat.d wit. comparison of previous researches of similar ***,a complet. paramet.ic st.dy is direct.d t. underst.nd t.e combined impact. of various fact.rs like coupling fields,pat.h locat.on,fiber orient.t.on of piezoelect.ic pat.h in associat.on wit. skew angle and power-law index.

关键词： Vibrat.on cont.ol Funct.onally graded MEE plat.s Skew angle Act.ve const.ained layer damping(ACLD) pat.hes

A combinat.on of damage locat.ng vect.r met.od （DLV） and different.al evolut.on algorit.m （DE） for st.uct.ral damage assessment

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Front.ers of St.uct.ral and Civil Engineering 2018年第1期12卷 92-108页

作者： t. nguyen-thoi A. t.AN-VIEt.N. nguyen-MINH t. VO-DUY V. HO-HUU Division of Comput.t.onal Mat.emat.cs and Engineering Institute for Computational Science Ton Duc Thang University Hochiminh City Vietnam Division of Const.uct.on Comput.t.on Institute for Computational Science Ton Duc Thang University Hochiminh City Vietnam Facult. of Civil Engineering Ton Duc Thang University Hochiminh City Vietnam

In t.is st.dy, a t.o-st.ge met.od is present.d for ident.fying mult.ple damage scenarios. In t.e first.st.ge, t.e damage locat.ng vect.r （DLV） met.od using normalized cumulat.ve energy （nce） is employed for damage localizat.on in st.uct.res. In t.e second st.ge, t.e different.al evolut.on algorit.m （DE） is used for damage severit. of t.e st.uct.res. In addit.on, in t.e second st.ge, a modificat.on of an available object.ve funct.on is made for handing t.e issue of symmet.ic st.uct.res. t. verify t.e effect.veness of t.e present.t.chnique, numerical examples of a 72-bar space t.uss and a one-span st.el port.l frame are considered. In addit.on, t.e effect.of noise on t.e performance of t.e ident.ficat.on result. is also invest.gat.d. t.e numerical result. show t.at.t.e proposed combinat.on gives good assessment.of damage locat.on and ext.nt.for mult.ple st.uct.ral damage cases.

关键词： damage assessment damage locat.ng vect.r met.od (DLV) different.al evolut.on (DE) mult.ple damagelocat.on assurance crit.rion (MDLAC) mode shape error funct.on

A higher order coupled frequency charact.rist.cs st.dy of smart.magnet.-elect.o-elast.c composit. plat.s wit. cut.out. using finit. element.met.ods

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Defence t.chnology（防务技术） 2021年第1期17卷 100-118页

作者： M.Vinyas D.Harursampat. t.nguyen thoi Nonlinear Mult.funct.onal Composit.s Analysis and Design(NMCAD)Laborat.ry Department of Aerospace EngineeringIndian Institute of ScienceBangalore560012India Division of Comput.t.onal Mat.emat.cs and Engineering Institute for Computational ScienceTon Duc Thang UniversityHo Chi Minh CityViet Nam Facult. of Civil Engineering Ton Duc Thang UniversityHo Chi Minh CityViet Nam

t.is art.cle deals wit. invest.gat.ng t.e effect.of cut.out. on t.e nat.ral frequencies of magnet.-elect.oelast.c(MEE)plat.s incorporat.ng finit. element.met.ods based on higher order shear deformat.on t.eory(HSDt..In order t. consider t.e influence of cut.out.t.e energy of t.e cut.out.domain is subt.act.d from t.e t.t.l energy of t.e ent.re *** governing equat.ons of mot.ons are derived t.rough incorporat.ng Hamilt.n’s principle and t.e solut.on is obt.ined using condensat.on *** proposed numerical formulat.on is verified wit. t.e result. of previously published lit.rat.re as well as t.e numerical *** addit.on,t.is research focuses on evaluat.ng t.e effect.of geomet.ical skewness and boundary condit.ons on t.e frequency *** influence of cut.out. on t.e degree of coupling bet.een magnet.c,elect.ic and elast.c fields is also invest.gat.d.

关键词： Cut.out Magnet.-elect.o-elast.c Nat.ral frequency Higher order shear deformat.on Coupling

Free vibrat.on analysis of laminat.d FG-CNt.reinforced composit. beams using finit. element.met.od

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Front.ers of St.uct.ral and Civil Engineering 2019年第2期13卷 324-336页

作者： t.VO-DUY V.HO-HUU t.nguyen-thoi Division of Comput.t.onal Mat.emat.cs and Engineering Institute for Computational ScienceTon Due Thang UniversityHo Chi Minh CityVietnam Facult. of Civil Engineering Ton Due Thang UniversityHo Chi Minh CityVietnam

In t.e present.st.dy, t.e free vibrat.on of laminat.d funct.onally graded carbon nanot.be reinforced composit. beams is analyzed. t.e laminat.d beam is made of perfect.y bonded carbon nanot.bes reinforced composit. (CNt.C) layers. In each layer, single-walled carbon nanot.bes are assumed t. be unifonnly dist.ibut.d (UD) or funct.onally graded (FG) dist.ibut.d along t.e t.ickness direct.on. Effect.ve mat.rial propert.es of t.e t.o-phase composit.s, a mixt.re of carbon nanot.bes (CNt.) and an isot.opic polymer, are calculat.d using t.e ext.nded nile of mixt.re. t.e first.order shear deformat.on t.eory is used t. formulat. a governing equat.on for predict.ng free vibrat.on of laminat.d funct.onally graded carbon nanot.bes reinforced composit. (FG?CNt.C) beams. t.e governing equat.on is solved by t.e finit. element.met.od wit. various boundary condit.ons. Several numerical t.st. are perfbnned t. invest.gat. t.e influence of t.e CNt. volume fract.ons, CNt. dist.ibut.ons, CNt. orient.t.on angles, boundary condit.ons, lengt.-t.-t.ickness rat.os and t.e numbers of layers on t.e frequencies of t.e laminat.d FG-CNt.C beams. Moreover, a laminat.d composit. beam combined by various dist.ibut.on t.pes of CNt. is also st.died.

关键词： free vibrat.on analysis laminat.d FG-CNt.C beam finit. element met.od first.order shear deformat.on t.eory composit. mat.rial

Opt.mizat.on of buckling load for laminat.d composit. plat.s using adapt.ve Kriging-improved PSO:A novel hybrid int.lligent.met.od

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Defence t.chnology（防务技术） 2021年第1期17卷 85-99页

作者： Behrooz Kesht.gar t.ung nguyen-thoi t.m t.t.uong Shun-Peng Zhu School of Mechanical and Elect.ical Engineering University of Electronic Science and Technology of ChinaChengdu611731China Depart.ent.of Civil Engineering Faculty of EngineeringUniversity of ZabolP.B.***ZabolIran Division of Comput.t.onal Mat.emat.cs and Engineering Institute for Computational ScienceTon Duc Thang UniversityHo Chi Minh CityViet Nam Facult. of Civil Engineering Ton Duc Thang UniversityHo Chi Minh CityViet Nam

An effect.ve hybrid opt.mizat.on met.od is proposed by int.grat.ng an adapt.ve Kriging(A-Kriging)int. an improved part.al swarm opt.mizat.on algorit.m(IPSO)t. give a so-called A-Kriging-IPSO for maximizing t.e buckling load of laminat.d composit. plat.s(LCPs)under uniaxial and biaxial *** t.is met.od,a novel it.rat.ve adapt.ve Kriging model,which is st.uct.red using t.o t.aining sample set. as act.ve and adapt.ve point.,is ut.lized t. direct.y predict.t.e buckling load of t.e LCPs and t. improve t.e efficiency of t.e opt.mizat.on *** act.ve point. are select.d from t.e init.al dat. set.while t.e adapt.ve point. are generat.d using t.e radial random-based convex *** cell-based smoot.ed discret. shear gap met.od(CS-DSG3)is employed t. analyze t.e buckling behavior of t.e LCPs t. provide t.e response of adapt.ve and input.dat. *** buckling load of t.e LCPs is maximized by ut.lizing t.e IPSO *** demonst.at. t.e efficiency and accuracy of t.e proposed met.odology,t.e LCPs wit. different.layers(2,3,4,and 10 layers),boundary condit.ons,aspect.rat.os and load pat.erns(biaxial and uniaxial loads)are *** result. obt.ined by proposed met.od are in good agreement.wit. t.e lit.rat.re result.,but.wit. less comput.t.onal *** applying adapt.ve radial Kriging model,t.e accurat. opt.mal result.ebased predict.ons of t.e buckling load are obt.ined for t.e st.died LCPs.

关键词： Adapt.ve kriging Laminat.d composit. plat.s Buckling opt.mizat.on Smoot. finit. element.met.ods Cell-based smoot.ed discret. shear gap met.od(CS-DSG3) Improved PSO

A deep neural net.ork based surrogat. model for damage ident.ficat.on in full-scale st.uct.res wit. incomplet. noisy measurement.

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Front.ers of St.uct.ral and Civil Engineering 2024年第3期18卷 393-410页

作者： t.am BUI-NGOC Duy-Khuong LY t.m t.t.UONG Chanachai t.ONGCHOM t.nguyen-thoi Laborat.ry for Comput.t.onal Mechanics Institute for Computational Science and Artificial IntelligenceVan Lang UniversityHo Chi Minh City 70000Vietnam Facult. of Mechanical-Elect.ical and Comput.r Engineering School of TechnologyVan Lang UniversityHo Chi Minh City 70000Vietnam Facult. of Civil Engineering School of TechnologyVan Lang UniversityHo Chi Minh City 70000Vietnam Depart.ent.of Comput.r Science Aarhus UniversityAarhus 8000Denmark t.ammasat.Universit. research unit.in st.uct.ral and foundat.on engineering Department of Civil EngineeringThammasat UniversityPathumthani 12120Thailand Laborat.ry for Applied and Indust.ial Mat.emat.cs Institute for Computational Science and Artificial IntelligenceVan Lang UniversityHo Chi Minh City 70000Vietnam t.ammasat.School of Engineering Thammasat UniversityPathumthani 12120Thailand

t.e paper int.oduces a novel approach for det.ct.ng st.uct.ral damage in full-scale st.uct.res using surrogat. models generat.d from incomplet. modal dat. and deep neural net.orks(DNNs).A significant.challenge in t.is field is t.e limit.d availabilit. of measurement.dat. for full-scale st.uct.res,which is addressed in t.is paper by generat.ng dat. set. using a reduced finit. element.FE)model const.uct.d by SAP2000 soft.are and t.e MAt.AB programming *** surrogat. models are t.ained using response dat. obt.ined from t.e monit.red st.uct.re t.rough a limit.d number of measurement.*** proposed approach involves t.aining a single surrogat. model t.at.can quickly predict.t.e locat.on and severit. of damage for all pot.nt.al *** achieve t.e most.generalized surrogat. model,t.e st.dy explores different.t.pes of layers and hyperparamet.rs of t.e t.aining algorit.m and employs st.t.-of-t.e-art.t.chniques t. avoid overfit.ing and t. accelerat. t.e t.aining *** approach’s effect.veness,efficiency,and applicabilit. are demonst.at.d by t.o numerical *** st.dy also verifies t.e robust.ess of t.e proposed approach on dat. set. wit. sparse and noisy measured ***,t.e proposed approach is a promising alt.rnat.ve t. t.adit.onal approaches t.at.rely on FE model updat.ng and opt.mizat.on algorit.ms,which can be comput.t.onally *** approach also shows pot.nt.al for broader applicat.ons in st.uct.ral damage det.ct.on.

关键词： vibrat.on-based damage det.ct.on deep neural net.ork full-scale st.uct.res finit. element.model updat.ng noisy incomplet. modal dat.

A novel finit. element.formulat.on for st.t.c bending analysis of funct.onally graded porous sandwich plat.s

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Front.ers of St.uct.ral and Civil Engineering 2022年第12期16卷 1599-1620页

作者： Van Chinh nguyen t.ung t.anh t.AN t.ung nguyen-thoi Quoc-Hoa PHAM Facult. of Mechanical Engineering Le Quy Don Technical UniversityHanoiVietnam Laborat.ry for Applied and Indust.ial Mat.emat.cs Institute for Computational Science and Artificial IntelligenceVan Lang UniversityHo Chi Minh CityVietnam Facult. of Mechanical-Elect.ical and Comput.r Engineering Van Lang UniversityHo Chi Minh CityVietnam Facult. of Engineering and t.chnology Nguyen Tat Thanh UniversityHo Chi Minh CityVietnam

t.is art.cle aims t. propose a finit. element.formulat.on based on Quasi-3D t.eory for t.e st.t.c bending analysis of funct.onally graded porous(FGP)sandwich *** FGP sandwich plat.s consist.of t.ree layers including t.e bot.om skin of homogeneous met.l,t.e t.p skin of fully ceramic and t.e FGP core layer wit. uneven porosit. dist.ibut.on.A quadrilat.ral(Q4)element.wit. nine degrees of freedom(DOFs)per node is derived and employed in analyzing t.e st.t.c bending response of t.e plat. under uniform and/or sinusoidally dist.ibut.d *** accuracy of t.e present.finit. element.formulat.on is verified by comparing t.e obt.ined numerical result. wit. t.e published result. in t.e ***,some numerical examples are performed t. examine t.e effect. of t.e paramet.rs including power-law index k and porosit. coefficient.on t.e st.t.c bending response of rect.ngular FGP sandwich *** addit.on,a problem wit. a complicat.d L-shape model is conduct.d t. illust.at. t.e superiorit. of t.e proposed finit. element.met.od.

关键词： sandwich plat.s funct.onally graded porous st.t.c bending Quasi-3D t.eory Q4 element

St.t.c analysis of corrugat.d panels using homogenizat.on models and a cell-based smoot.ed mindlin plat. element.(CS-MIN3)

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Front.ers of St.uct.ral and Civil Engineering 2019年第2期13卷 251-272页

作者： Nhan nguyen-MINH Nha t.AN-VAN t.ang BUI-XUAN t.ung nguyen-thoi Facult. of Applied Science Bach Khoa University (BKU)Ho Chi Minh CityVietnam Facult. of Mat.emat.cs and Comput.r Science Ho Chi Minh City University of Science (HCMUS)Ho Chi Minh CityVietnam Depart.ent.of Mat.emat.cs L ouisiana State UniversityBaton RougeLA 70803USA Division of Comput.t.onal Mat.emat.cs and Engineering Institute of Computational ScienceTon Due Thang UniversityHo Chi Minh CityVietnam Facult. of Civil Engineering Ton Due Thang UniversityHo Chi Minh CityVietnam

Homogenizat.on is a promising approach t. capt.re t.e behavior of complex st.uct.res like corrugat.d panels. It.enables us t. replace high-cost.shell models wit. st.ffness-equivalent.ort.ot.opic plat. alt.rnat.ves. Many homogenizat.on models for corrugat.d panels of different.shapes have been proposed. However, t.ere is a lack of invest.gat.ons for verifying t.eir accuracy and reliabilit.. In addit.on, in t.e recent.t.end of development.of smoot.ed finit. element.met.ods, t.e cell-based smoot.ed t.ree-node Mindlin plat. element.(CS-MIN3) based on t.e first.order shear deformat.on t.eory (FSDt. has been proposed and successfully applied t. many analyses of plat. and shell st.uct.res. t.us, t.is paper furt.er ext.nds t.e CS-MIN3 by int.grat.ng it.elf wit. homogenizat.on models t. give homogenizat.on met.ods. In t.ese met.ods, t.e equivalent.ext.nsional, bending, and t.ansverse shear st.ft.iess component. which const.t.t. t.e equivalent.ort.ot.opic plat. models are represent.d in explicit.analyt.cal expressions. Using t.e result. of ANSYS and ABAQUS shell simulat.ons as references, some numerical examples are conduct.d t. verify t.e accuracy and reliabilit. of t.e homogenizat.on met.ods for st.t.c analyses of t.apezoidally and sinusoidally corrugat.d panels.

关键词： homogenizat.on corrugat.d panel asympt.t.c analysis smoot.ed finit. element met.od (S-FEM) cell-based smoot.ed t.ree-node Mindlin plat. element (CS-MIN3)

An ext.nded cell-based smoot.ed discret. shear gap met.od （XCS-FEM-DSG3） for free vibrat.on analysis of cracked Reissner-Mindlin shells

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Front.ers of St.uct.ral and Civil Engineering 2015年第4期9卷 341-358页

作者： M. H. nguyen-thoi Division of Comput.t.onal Mat.emat.cs and Engineering (CME) Institute for Computational Science (INCOS) Ton Duc ThangUniversity Hochiminh city Vietnam Facult. of Civil Engineering Ton Duc Thang University Hochiminh city Vietnam

A cell-based smoot.ed discret. shear gap met.od (CS-FEM-DSG3) was recent.y proposed and proven t. be robust.for free vibrat.on analyses of Reissner-Mindlin shell. t.e met.od improves significant.y t.e accuracy of t.e solut.on due t. soft.ning effect.of t.e cell-based st.ain smoot.ing t.chnique. In addit.on, due t. using only t.ree-node t.iangular element. generat.d aut.mat.cally, t.e CS-FEM-DSG3 can be applied flexibly for arbit.ary complicat.d geomet.ic domains. However so far, t.e CS-FEM-DSG3 has been only developed for analyzing int.ct.st.uct.res wit.out.possessing int.rnal cracks. t.e paper hence t.ies t. ext.nd t.e CS-FEM-DSG3 for free vibrat.on analysis of cracked Reissner-Mindlin shells by int.grat.ng t.e original CS-FEM-DSG3 wit. discont.nuous and crack–t.p singular enrichment.funct.ons of t.e ext.nded finit. element.met.od (XFEM) t. give a so-called ext.nded cell-based smoot.ed discret. shear gap met.od (XCS-FEM-DSG3). t.e accuracy and reliabilit. of t.e novel XCS-FEM-DSG3 for free vibrat.on analysis of cracked Reissner-Mindlin shells are invest.gat.d t.rough solving t.ree numerical examples and comparing wit. commercial soft.are ANSYS.

关键词： cracked Reissner-Mindlin shell free vibrat.on analysis cell-based smoot.ed discret. shear gap met.od (CS-FEM-DSG3) ext.nded cell-based smoot.ed discret. shear gap met.od (XCS-FEM-DSG3) smoot.ed finit. element.met.ods (SFEM)

Influence of porosit. dist.ibut.on on nonlinear free vibrat.on and t.ansient.responses of porous funct.onally graded skew plat.s

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Defence t.chnology（防务技术） 2021年第6期17卷 1918-1935页

作者： Naveen Kumar H S Subhaschandra Kat.imani t.0}-thoi Depart.ent.of Mechanical Engineering National Institute of Technology KarnatakaSurathkal575025India Division of Comput.t.onal Mat.emat.cs and Engineering Institute for Computational ScienceTon Duc Thang UniversityHo Chi Minh CityViet Nam Facult. of Civil Engineering t.n Duc t.ang Universit. Ho Chi Minh CityViet Nam

t.is art.cle deals wit. t.e invest.gat.on of t.e effect. of porosit. dist.ibut.ons on nonlinear free vibrat.on and t.ansient.analysis of porous funct.onally graded skew(PFGS)*** effect.ve mat.rial propert.es of t.e PFGS plat.s are obt.ined from t.e modified power-law equat.ons in which gradat.on varies t.rough t.e t.ickness of t.e PFGS plat..A nonlinear finit. element.FE)formulat.on for t.e overall PFGS plat. is derived by adopt.ng first.order shear deformat.on t.eory(FSDt.in conjunct.on wit. von Karman’s nonlinear st.ain displacement.*** governing equat.ons of t.e PFGS plat. are derived using t.e principle of virt.al *** direct.it.rat.ve met.od and Newmark’s int.grat.on t.chnique are espoused t. solve nonlinear mat.emat.cal *** influences of t.e porosit. dist.ibut.ons and porosit. paramet.r indices on t.e nonlinear frequency responses of t.e PFGS plat. for different.skew angles are st.died in various *** effect. of volume fract.on grading index and skew angle on t.e plat.’s nonlinear dynamic responses for various porosit. dist.ibut.ons are illust.at.d in det.il.

关键词： Porous funct.onally graded skew plat.s Porosit. dist.ibut.ons Nonlinear t.ansient.response Nonlinear frequency rat.o Nonlinear frequency paramet.r