Informação

Nesta secção serão divulgados seminários, workshops ou palestras que possam ser de interesse aos alunos do Programa Doutoral em Engenharia Mecânica.

Seminário Prof. Richard Neptune

Biomechanical Analyses of Human Movement: Insight into Neuromotor Control

Professor Richard Neptune
University of Texas at Austin

Dia 9/12/2013 das 10H-11H
Sala AM (Anfiteatro de Mecânica) no Ed. de Mecânica II

Abstract:
The human neuromusculoskeletal system is exceedingly complex. As a result, an integrated understanding of normal and pathological movement remains a challenge due to the extremely difficult, if not impossible, task of measuring the governing elements of muscle coordination and the effects of individual muscle forces on the resulting movement. This talk will discuss how experimental and modeling and simulation techniques are being used to gain insight into neuromotor control mechanisms used during human movement.
 
Short Bio:
Dr. Richard Neptune earned his Ph.D. in Mechanical Engineering from the University of California, Davis in 1996 and has served on the Department of Mechanical Engineering faculty at UT Austin since 2001 in the Biomechanical Engineering and Dynamic Systems & Control programs. His research integrates musculoskeletal modeling, computer simulation and experimental analyses to identify the neuromotor and biomechanical mechanisms that contribute to locomotor impairments in a number of patient populations including lower-limb amputees, stroke patients, and wheelchair users. He is also involved in research aimed at optimizing orthotic and prosthetic designs to improve their performance and rehabilitation outcomes using advanced additive manufacturing techniques. His research is supported primarily by the Department of Veteran’s Affairs, National Science Foundation and National Institutes of Health. In 2002, Dr. Neptune received the American Society of Biomechanics Young Scientist Award. In 2004, he received a CAREER award from
the National Science Foundation (NSF) and the Da Vinci Award from the Engineering Society of Detroit and National Multiple Sclerosis Society for the application of Selective Laser Sintering techniques to improve mobility for those with lower-limb disabilities. In 2006, he received the Outstanding Young Scientist Award from the Houston Society for Engineering in Medicine and Biology. In 2012 he was named a Professor of Excellence by The University of Texas at Austin and in 2013 received the Joe and Bettie Branson Ward Endowed Excellence Award from The University of Texas at Austin for his teaching and research that has contributed to changes of positive value to society. He is on the Editorial Board for the Journal of Applied Biomechanics and an Associate Editor for the ASME Journal of Biomechanical Engineering. He currently holds the John T. MacGuire Professorship in Mechanical Engineering.
 
Webpage:
http://www.me.utexas.edu/~neptune/ 
 
Additional information:
Prof. Miguel Tavares da Silva
MiguelSilva@tecnico.ulisboa.pt 
 
This seminar is presented under the scope of the UT Austin | Portugal Program

Seminário Dr. Guilherme Vaz

ReFRESCO – A General Multi-Phase URANS Code for the Maritime, Offshore and Renewable Energy Industry

Dr. Guilherme Vaz                                                                                                                                      

SEMINÁRIO CANCELADO

Seminário Prof. R. Bogacz - Prof. P. Koziol

(Part 1 * 40min): Selected Dynamical Phenomena in High-Speed Trains

Prof. Roman Bogacz,

Faculty of Civil Engineering,

Krakow University of Technology, and  Department of Automotive Engineering, 

Warsaw University of Technology, Poland


(Part 2 * 20min):  Dynamics of beam resting on nonlinear foundation: wavelet based Adomian solution

Prof. Piotr Koziol,

Koszalin University of Technology, Poland


Data: 20 de Junho de 2013, 15:00h

Local: Sala de reuniões do DEM, Pav. Mecª. III

Seminário Prof. R. Bogacz - Prof. P. Koziol

(Part 1 * 40min): Selected Dynamical Phenomena in High-Speed Trains

Prof. Roman Bogacz,

Faculty of Civil Engineering,

Krakow University of Technology, and  Department of Automotive Engineering, 

Warsaw University of Technology, Poland


(Part 2 * 20min):  Dynamics of beam resting on nonlinear foundation: wavelet based Adomian solution

Prof. Piotr Koziol,

Koszalin University of Technology, Poland


Data: 20 de Junho de 2013, 15:00h

Local: Sala de reuniões do DEM, Pav. Mecª. III

Seminário - Prof. Dionisio Bernal

 A THEOREM CONNECTING INFLUENCE LINES TO DAMAGE LOCATION

Prof. Dionisio Bernal,
Civil and Environmental Engineering Department
Northeastern University, Boston, USA

Date: May 17,  2013, 14:30h
Room: Sala de reuniões do DEM, Pav. Mecª. III

Abstract:

A recently introduced theorem on the localization of damage from changes in flexibility is reviewed. The theorem states that the image of the change in the flexibility matrix resulting from damaged is a basis for the influence lines of the stress resultants at the damaged locations. The theorem is the dual of the damage locating vector theorem, which states that the vectors in the kernel lead to stress fields that are zero over closed regions that contain the damage. Extension of the theorem to cases where flexibility matrices cannot be extracted from vibration data is realized by replacing the flexibility change with a surrogate. Performance of the image based localization approach is examined in simulations and in an experimental setting.

Seminário - Dr. Dmitri Tcherniak

Modal Analysis on Operating Wind Turbines

Dr. Dmitri Tcherniak, Ph.D.
Bruel & Kjaer, Denmark 

Date: May 16,2013, 10:00-11:00
Room: V1.15 (Pav. Civil, IST Alameda).

 
Abstract:
 
1. Brief introduction of the speaker and Bruel and Kjaer
2. Brief introduction to Operational Modal Analysis (OMA) 
a. Experimental modal analysis (EMA) vs. OMA
b. Why OMA is possible?
c. OMA assumptions and how realistic they are
d. What to measure and how to measure
e. OMA algorithms 
3. OMA in application to wind turbines
a. Understanding of wind turbines dynamics
b. Violation of OMA assumptions in the case of operating wind turbine
c. Coleman transformation as a tool for converting LPTV system to LTI system
d. Understanding of typical modes of an operating wind turbine 
4. Case studies:
a. Modal analysis of a standalone blade
b. OMA of an operating 3MW wind turbine
c. OMA of a smaller wind turbine with blades instrumented 
5. Conclusion 
 

Profª Nathalie Gerlach

"Infrared thermography as a non-destructive testing for aeronautical composite materials "
Dia 2 de Abril, das 14h30 às 15h30 , na sala de reuniões do DEM

Prof. Awf Al-Kassir

SEMINÁRIOS

"Biomass combustion and gasification" and

"Biomass drying"

Prof. Awf Al-Kassir
Universidade da Estremadura, Badajoz, Espanha

Dias 11/12/2008 e 12/12/2008 , 11:00 H, Sala Reuniões do DEM, Pav. Mecª III

Dr. Miguel J. Patrício Dias

INSTITUTO SUPERIOR TÉCNICO - IDMEC

SEMINÁRIO

Propagação de Fendas em Materiais Compósitos Muito Heterogéneos

Dr. Miguel J. Patrício Dias

Eindhoven Un. of Technology

Pretende-se analisar o problema da predição do crescimento de fendas em materiais compósitos, altamente heterogéneos e periodicamente distribuídos.

É assumido que as componentes do material são linearmente elásticas, isotrópicas e homogéneas.

Dependendo da escala à qual o problema é considerado, diferentes pontos de vista podem ser adoptados. A estratégia mais simples advém de observar o material à escala macroscópica. É então assumido que a propagação ocorre num material homogéneo e estamos dentro do âmbito da mecânica da fractura linear elástica.

Quando a escala dos constituintes é considerada, os compósitos têm uma estrutura complexa. Neste caso, os problemas de elasticidade que será necessário resolver para obter a distribuição de tensões na vizinhança da ponta da fenda requerem a introdução de técnicas adequadas, como a teoria da homogeneização ou a decomposição de domínios.

Um procedimento híbrido, combinando as técnicas anteriores, permite-nos olhar para o problema da propagação de fendas à escala dos constituintes na vizinhança da ponta da fenda e à escala macroscópica no restante domínio computacional. Podemos assim estabelecer um algoritmo para analisar a propagação de fendas em materiais fatiados, tomando em consideração aspectos como a interacção das fendas com as fronteiras internas do material.

Local: IST, Sala de reuniões do DEM, Pav. Eng. Mecânica III

Data: 3ª Feira, 9 de Dezembro de 2008

Hora: 11.00-12:00 Horas

Informações: Helder C. Rodrigues hcr@ist.utl.pt



Seminário - João Silva Soares

Dia 29/10/2008 - 15:00h - Sala 3.10 Edificio da Matemática

Constitutive Modeling of Biodegradable Polymers for Application in
Endovascular Stents

by
João Silva Soares
Department of Mechanical Engineering, Texas A&M University, USA
ABSTRACT:
Balloon angioplasty followed by stent implantation has been of great benefit
in coronary applications, whereas in peripheral applications, success rates
remain low. Analysis of healing patterns in successful deployments shows
that six months after implantation the artery has reorganized itself and
there is no purpose for the stent to remain, potentially provoking
inflammation and foreign body reaction. Thus, a fully absorbable stent that
fulfills the mission and steps away is of great benefit.
Biodegradable polymers have a widespread usage in the biomedical field, such
as sutures, scaffolds and implants. Aliphatic polyesters (the main class of
biodegradable polymers used in biomedical applications) degrade by random
scission due to passive hydrolysis which results in molecular weight
reduction, loss of strength, and ultimately, loss of mass. A constitutive
model involving degradation and its impact on mechanical properties was
developed through an extension of a material which response depends on the
history of the motion and on a scalar parameter reflecting the local extent
of degradation. The material properties decrease with degradation and a rate
equation describing the chain scission process confers characteristics of
stress relaxation, creep and hysteresis. These phenomena arise due to the
entropy-producing nature of degradation and are markedly different from
their viscoelastic counterparts.

3rd Workshop on CFD Uncertainty Analysis

Nos próximos dias 23 e 24 de Outubro de 2008, o MARETEC, Centro de Ambiente e Tecnologia Marítima do Departamento de Engenharia Mecânica do Instituto Superior Técnico, vai organizar a "3 rd Workshop on CFD Uncertainty Analysis".

VI Encontro da Engenharia Biomédica IST- FMUL

O Instituto Superior Técnico (IST) e a Faculdade de Medicina da Universidade de Lisboa (FMUL) vão promover o "VI Encontro da Engenharia Biomédica IST- FMUL", que decorrerá no próximo dia 15 de Outubro de 2008 no Anfiteatro do Complexo Interdisciplinar do IST, entre as 9h15 e as 18h00.

Seminário - Nicolas Van Goethem

UNIVERSIDADE DE LISBOA - CENTRO DE MATEMATICA E APLICACOES FUNDAMENTAIS
Outubro de 2008, Dia 23, 5ª feira, às 14h15
"Introduction to damage and fracture" (Part II) por Nicolas Van Goethem (CMAF, Universidade de Lisboa)
LOCAL: Complexo Interdisciplinar, Sala B3-01
Av. Prof. Gama Pinto Nº2
http://cmaf.fc.ul.pt/seminarios/seminarios-pt.html

Seminário -  Nicolae Doru Stanescu

Convidam-se todos os interessados para assistirem ao seminário do Prof. Nicolae Doru Stanescu (da Universidade de Pitesti, Roménia ) intitulado:
" NON-LINEAR NEO-HOOKEAN SYSTEMS ",
que se realizará no dia 23 de Outubro de 2008 pelas 17.30 Auditório do Complexo Interdisciplinar do IST.