ESOLIA & SOLTRACK Team attended the 2024 edition of GENERA in Madrid last week. We presented the DEMO-TRACK, the first portable device ever for teaching&learning&researching on the aeroelastic instabilities of single axis solar trackers, particularly 1DOF flutter. General public and companies turned out to be really interested in the matter and the solution we proposed. We also held many meetings with constructors. Really grateful and proud of every one on board. We would like to acknowledge to this event´s sponsors: "Excmo. Ayuntamiento de Mieres" and Polytechnic School of Mieres and to our awesome host IMEnergy Power Plants, S.L. Looking forward to meeting you all again!
CPP, one of the pioneer aerodynamic laboratories in the study of solar tracker galloping, says that not all the wind tunnels are the same... and it is true.
Well, not all Stability Diagrams for the aeroelastic design of structures are the same either... or are they? Well, if you copy it, then it will match point for point... we usually call it plagiarism (we all should fight this stronger, seriously, I´ve noticed some cases - other disciplines - last month!).
Let me explain crystal clear, by telling a tale.
This is the original image, obtained two years ago by Dep. of Energy - Uniovi and given to a (hypothetical) company we used to work with. It was named "Diagrama de Estabilidad del Tracker" by the Authors (and it was depicted and properly published after months of huge work and dedication):
And guess what? That figure never reached its intended destination, a third-party (hypothetical, again) company. Now, this is the image that the (hypothetical) company presented in a live webinar (hypothetically speaking) some time ago, pretending it was their own...
And this is the "magic". The less detailed is the image you (well, they, hypothetically) pretend to present, the easier is to "fake" it. A simple geometrical retouching and cutting... and "voilà!", trick comes to the surface.
But beyond some unfortunate anecdotes on the sidelines, the science of civil aerodynamics unites many great engineers all over the globe since decades, each of them trying to do their bit to explain and master the terrible phenomenon of the one degree of freedom flutter. Blessed are the people of good will (the majority, btw)!!!
We publish this poster as a tribute to all those who precede and accompany us in this exciting endeavor.
By the way, we welcome all the "fake free" contributions that you want to share and include in!
Aeroelasticity is like a kind of black hole ... the darkest source of infinite curiosity across Universe.
"Lies are like flies, they fly everywhere and pose where the sweet smell of curiosity is strongest" (Pio Rossi). And those who unscrupulously plagiarize are "vagrants of knowledge."
We continue studying and learning every day… thanks to a lot of people and colleagues who share their achievements and time, even during these hazardous times.
And, paraphrasing the discovers of Cygnus X-1… , “it might be galloping”.
Happy 2020 Easter to everyone!
Our Group (GIFD, Department of Energy, University of Oviedo) is developing a new method to calculate the structure of the Photovoltaic Solar Trackers against the effect of wind. Due to the lack of knowledge (there is only a little scientific knowledge because this is a very new and recent issue) we found in the national and international standard and codes, a few of laboratories and wind tunnels all over the world are trying to find out what is the aeroelastic mechanism which causes such a disaster called torsional galloping or 1DOF flutter.
We leave herein below one of our 2D CFD approaches, showing a real case of a single axis solar tracker placed at 30º of initial tilt angle panel and oscillating at 1,2 Hz and moderate amplitudes, under wind speed of 20 m/s.
I'm going to start to point out the work of my pupils. I think this is the reason of the work at University, I mean, the students. So, today I would like to mention the excellent TFG carried out by Pablo Canseco and Edgar Imaz.
The have been worked in the development of a new movable scaffolding system and the study of the reconstruction of the port of Cudillero, Asturias, Spain, after the heavy storms in 2013 and 2014.
Congratulations for your results.
I do not believe in QUALITY. I do not believe in surveys. I do not.
At least when this things are going together and are used by ignorants with the aim of pretending knowing.
So let me share this paper with you and you will see. Yo will become truly non believer like me. Or much better than that, you will only believe in real things, important things, reasonable things.
An Evaluation of Course Evaluations (click).
Philip B. Stark, Department of Statistics, University of California, Berkeley
Berkeley, CA 94720, United States
Richard Freishtat, Center for Teaching and Learning, University of California, Berkeley
Berkeley, CA 94720, United States
26 September 2014.
This is like a motto, something that you must keep in mind when you find in your way someone who never should have got power over others.
The first edition of this Competition took place last year at University of Oviedo (E.P.M. and E.P.I.G.). It was a nice experience, 50 students ran for the prize and we all learned a lot, I hope so.
Tableros y Puentes, S.A.
ACHE, Asociación Científico-Técnica del Hormigón Estructural.
Colegio Oficial de Ingenieros de Caminos, Canales y Puertos, Demarcación de Asturias
RJB Design Studio.
Escuela Politécnica de Mieres, Universidad de Oviedo.
"Conferencias Aula Abierta:
De maceta a rascacielos. El hormigón armado, la invención de un material. November 07, 2014, 12 p.m."
Mercedes López García. Profesora titular de Estética de la Ingeniería de la Universidad Politécnica de Madrid.
A really interesting conference.
Some investigations have led experts to assess that G. Eiffel designed a steel truss bridge in Asturias: the "Parana" Viaduct in the railway from Lena to Pajares.
The story ended in 1954, when someone decided that the bridge was no longer available for the new convoyes...
Dr. Rosignoli has 32 years of experience in bridge design and construction in the US and abroad. He has worked with bridge contractors, designers, and owners in over 20 countries and four continents, serving as designer, reviewer, or technical leader for cable-stayed bridges, incrementally launched bridges, balanced-cantilever bridges, and light rail and high-speed railway bridges. An international authority on mechanized bridge construction and the incremental launching of bridges, he is the author of three books on bridge launching and mechanized bridge construction and more than 90 papers on bridge design and construction technology and holds more than 30 patents on bridge construction methods. He is also author of Chapter 6 of ASBI Construction Practices Handbook and of Chapter 6.37.40 of UNESCO Encyclopedia of Life Support Systems, he has founded and is chairing IABSE WG-6 Bridge Construction Equipment. He is member of ASBI Technical Advisory Committee, ASCE member, and IABSE fellow. He has published two "must-read" during the last year:
If you want to know what these four letters mean, please read "Los ingenieros de caminos" by Fernando Sáenz Ridruejo (ed. Colegio de Ingenieros de Caminos, Canales y Puertos, 1993).
Nowadays it is rather improbably that you will get the real concept, at least in some High School institutions. Nobody knows and nobody will explain to you.
Well, let me drop some thoughts. You will be able to teach something if you have learnt it, if you have done it. Our students don't need actors, politicians, governors, bureaucrats... but teachers: a teacher is side by side with pupils; and he is side by side with reality too.
Nowadays those want us to be called Civil Engineers. The more those say the word "quality" (regarding to teaching and learning) the less you can expect from them.
Students must not be blamed because of neither the educative collapse of the Engineering nor the fall of the Institution so called University... long time ago.
I'm afraid we will keep writing about this... unfortunately.
Scientists from different European countries describe in this letter that, despite marked heterogeneity in the situation of scientific research in their respective countries, there are strong similarities in the destructive policies being followed. This critical analysis, highlighted in Nature and simultaneously published in a number of newspapers across Europe, is a wake-up call to policy makers to correct their course, and to researchers and citizens to defend the essential role of science in society.
The national policymakers of an increasing number of Member States, along with European leaders, have completely lost touch with the reality of research.
They have chosen to ignore the crucial contribution of a strong research sector to the economy, particularly needed in the countries more severely hit by the economic crisis.
They have chosen to ignore that research does not follow political cycles; that long-term, sustainable R&D investment is critical because science is a long-distance race.
They have chosen to ignore that public investment in R&D is an attractor of private investment; that in an “innovation State” like the United States over half of its economic growth has come from innovation with roots in basic research funded by the federal government.
They have chosen to ignore that time and resources are required to train researchers.
They have chosen to ignore that applied research is no more than the application of basic research and is not limited to research with short-term market impact, as some policy makers seem to believe.
They have chosen to ignore how the scientific process works; that research requires experimentation and that not all experiments will be successful; that "excellence" is the tip of an iceberg that floats only because of the body of work beneath
They have chosen to ignore the critical synergy between research and education.
And foremost, they have chosen to ignore that research does not only need to serve the economy but also increases knowledge and social welfare, including of those with no resources to pay the bill.
They have chosen to ignore, but we are determined to remind them because their ignorance can cost us the future.
Amaya Moro-Martín, Astrophysicist; Space Telescope Science Institute, Baltimore (USA); EuroScience, Strasbourg; spokesperson of Investigación Digna (for Spain).
Gilles Mirambeau, HIV virologist; Sorbonne Universités, UPMC Univ. Paris VI (France); IDIBAPS, Barcelona (Spain); EuroScience Strasbourg.
Rosario Mauritti, Sociologist; ISCTE, CIES-IUL, Lisbon (Portugal).
Sebastian Raupach, Physicist; initiator of “Perspektive statt Befristung” (Germany).
Jennifer Rohn, Cell biologist; Division of Medicine, University College London, London (UK); Chair of Science is Vital.
Francesco Sylos Labini, Physicist; Enrico Fermi Center, Institute for Complex Systems (ISC-CNR), Rome (Italy); editor of Roars.it.
Varvara Trachana, Cell biologist; Faculty of Medicine, School of Health Sciences, University of Thessaly, Larissa (Greece).
Alain Trautmann, Cancer immunologist; CNRS, Institut Cochin, Paris (France); former spokesman of “Sauvons la Recherche”.
Patrick Lemaire, Embryologist; CNRS, Centre de Recherche de Biochimie Macromoléculaire, Universités of Montpellier; initiator and spokesman of “Sciences en Marche” (France).
Disclaimer: The views expressed by the signatories are not necessarily those of their employers.
A really incredible tipe-lapse of an outstanding bridge. Please notice the flexibility of the structure during the construction.
By Carlos Fernández Casado, S.L.
I know it does not sound like quite academic or professional stuff… I know it, and I don´t care about it.
I would like to dedicate the first to my Mom, since she is the only family member who is not an engineer… in this web that deals with engineering issues.
However, she is our main supporter.