2024-03-29T08:23:31Z
http://mcfns.com/index.php/Journal/oai
oai:ojs.mcfns.com:article/147
2021-04-14T18:20:09Z
Journal:MicroDetect
nmb a2200000Iu 4500
"130330 2013 eng "
1946-7664
dc
Selected Technical Aspects of Tu-154M Smolensk Air Crash on April 10, 2010
Gieras, Jacek F.
University of Technology and Life Sciences, Poland http://jfgieras.com/
Array
This is a collection of reports that consists of three parts. The author is a Professor of PowerElectrical Engineering, so he focuses on the Tu-154M power electric system and all aspects of the air crashthat relate to electrical equipment and wiring.
Part I discusses the electric power system of the Tu-154M. After brief introduction to aircraft power systems,the results of reverse design and analysis of GT40PCh6 wound-eld synchronous generator including shortcircuit have been presented. An example of failure of GT40PCh6 generator is the re of the Tu-154B-2 onJanuary 1, 2011 before taking o at Surgut airport (ight 7K348). Guidelines for proper investigation ofaircraft electric equipment and wiring after crash have been given. There is no evidence of examinationof most electrical equipment of the Tu-154M No 101 after crash on April 10, 2010. It is now extremelydicult to determine, if the electric power system of the Tu-154M No 101 was operating correctly in thelast seconds of the ight, or not.
Part II analyzes the fuel system and possibility of explosion of fuel-air mixture as a result of arcing and/orstatic electricity in the left wing outer fuel tank of the Tu-154M No 101. Examples of explosions of fueltanks (Boeing 747-131 TWA 800 on June 17, 1996 and Boeing 727-200 at Bangalore Airport on May 42006) have been discussed. Although probability of explosion of fuel in the left wing outer tank due theelectric short circuit, arcing or static electricity is low, this problem should be carefully considered in futureexamination of the wreckage and remaining electrical wiring and equipment.
Part III describes a comparative analysis of hypothetical collision of the Tu-154M No 101 with birch tree,full-scale dynamic crash test of Douglas DC-7 and full-scale dynamic crash test of Lockheed Constellation1649. The analysis pertains to the technical data of the Tu-154M, DC-7 and LC-1649 airliners, dierencesin their construction and conditions of collision/impact.
Contemporary Journal Concept Press
2013-03-30 00:00:00
Peer-reviewed Multidisciplinary Works
application/pdf
http://mcfns.com/index.php/Journal/article/view/147
Mathematical and Computational Forestry & Natural-Resource Sciences (MCFNS); Vol 5, No 1: MCFNS March 30, 2013
eng
http://mcfns.com/index.php/Journal/article/download/147/945
Smolensk, Russia
10 April 2010; Contemporary
Available documentations and review of sample studies
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oai:ojs.mcfns.com:article/153
2023-10-19T13:08:57Z
Journal:MicroDetect
nmb a2200000Iu 4500
"130330 2013 eng "
1946-7664
dc
Application of Numerical Methods for Crashworthiness Investigation of a Large Aircraft Wing Impact with a Tree
Zhang, Chao
University of Akron, USA http://www.uakron.edu/engineering/CE/
Binienda, Wieslaw K
University of Akron, USA http://www.uakron.edu/engineering/CE/
Horvat, Frank E
University of Akron, USA http://www.uakron.edu/engineering/ME/
Wang, Wenzhi
Northwestern Polytechnical University http://hangkong.nwpu.edu.cn/home/overview.htm
Array
This paper demonstrates application of a numerical methodology for full scale aircraft impact crashworthiness investigation. A special case, impact of an aircraft wing with a tree, was studied using LS-DYNA and ANSYS CFX. In particular, a detailed finite element model of the wing structure was represented as a box structure containing skin, spars and ribs, and fuel was represented as distributed mass. Several material models were utilized and verified using leading-edge bird strike and wood bending experiments. Wood model Mat 143 with material parameters developed based on the wood bending test was found as the most accurate in comparison with the experiment. The aerodynamic pressure distribution on the overall surface of the wing was accomplished using the commercially available Computational Fluid Dynamics (CFD) software ANSYS CFX. Results of the aerodynamic pressures on the wings surfaces were imported into the LS-DYNA finite element model. Parametric studies showed that a fragment of the leading edge of the wing was destroyed by the tree but the lifting surface of the wing was not destroyed. In every simulation scenario, the tree was cut by the first spar of the wing and fell in the direction of the movement of the airplane.
Contemporary Journal Concept Press
2013-03-30 00:00:00
Peer-reviewed Multidisciplinary Works
application/pdf
http://mcfns.com/index.php/Journal/article/view/153
Mathematical and Computational Forestry & Natural-Resource Sciences (MCFNS); Vol 5, No 1: MCFNS March 30, 2013
eng
http://mcfns.com/index.php/Journal/article/download/153/867
http://mcfns.com/index.php/Journal/article/download/153/869
Smolensk, Russia; worldwide applicable;
2010; contemporary;
material structural properties; density; MOE;
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oai:ojs.mcfns.com:article/155
2021-04-14T18:20:09Z
Journal:MicroDetect
nmb a2200000Iu 4500
"130330 2013 eng "
1946-7664
dc
Wood quality assessment of tree trunk from the tree branch sample and auxiliary data based on NIR Spectroscopy and SilviScan
Cieszewski, Chris J
The University of Georgia, USA http://scholar.google.com/citations?hl=en&user=npyjSdoAAAAJ&view_op=list_works&pagesize=10
Strub, Mike
The University of Georgia, USA
Antony, Finto
The University of Georgia, USA
Bettinger, Pete
The University of Georgia, USA http://scholar.google.com/citations?hl=en&user=rvCOS60AAAAJ&pagesize=100&view_op=list_work
Dahlen, Joseph
The University of Georgia, USA
Lowe, Roger C
The University of Georgia, USA
Array
We estimated wood quality parameters for a specific tree trunk using samples of this tree’s branch, and auxiliary samples from other similar species, based on analysis of wood density, modulus of elasticity (MOE), and microfibril angle (MFA), measured with the near-infrared spectroscopy (NIRS) and SilviScan processes. The measured materials included a branch sample from the subject tree, also known as the smolensk birch1, and stem analysis disk samples from silver birch (Betula pendula Roth) trees collected in central Poland. We analyzed and modeled the pith-to-bark and base-to-tip density changes in the silver birch samples, and using developed models estimated the subject tree trunk air-dry wood quality parameters and compared them with published yellow birch (Betula alleghaniensis) and silver birch tabular data. Then we compared the corresponding surrogated green wood parameters of the subject tree against the standard American utility wood pole parameters, and identified environmental adjustments necessary for a realistic and accurate representation of the final subject tree wood characteristics. The final conclusions from this study are that the subject tree dry wood parameters are not significantly different (in the statistical sense) from the well-documented yellow birch parameters, which were used as their surrogate, and even without the due reductions in parameters for excessive amount of whorls and branches, and for the height of the tree brake (5 to 7 m above ground), the structural parameters of the subject tree green wood, as applicable to live tree and as surrogated by appropriate yellow birch parameters, are generally weaker than corresponding dry wood parameters for the standard American wood poles and weaker then the southern yellow pine parameters. The adjustments for the whorls and knots and height of the brake may yield some additional 50% reduction in the estimates for the subject tree structural wood parameter values.
Contemporary Journal Concept Press
2013-03-30 00:00:00
Peer-reviewed Multidisciplinary Works
application/pdf
http://mcfns.com/index.php/Journal/article/view/155
Mathematical and Computational Forestry & Natural-Resource Sciences (MCFNS); Vol 5, No 1: MCFNS March 30, 2013
eng
Smolensk, Russia
April 2010
Wood samples; Tabular Data; Photographs;
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oai:ojs.mcfns.com:article/154
2021-04-14T18:20:09Z
Journal:MicroDetect
nmb a2200000Iu 4500
"130330 2013 eng "
1946-7664
dc
Micro-detail comparative forest site analysis using high-resolution satellite imagery
Cieszewski, Chris J
The University of Georgia, USA http://drcjc.com
Lowe, Roger C
The University of Georgia, USA
Bettinger, Pete
The University of Georgia, USA http://scholar.google.com/citations?hl=en&user=rvCOS60AAAAJ&pagesize=100&view_op=list_work
Kumar, Arun
The University of Georgia, USA
Array
This study presents comparative analysis of high-resolution satellite imagery taken on different dates around a detected incident of interest. Under an assumption of a micro-detail land monitoring and disturbance detection interests we compared the patterns of image captured disturbances on the analyzed site and leveraged their interpretation with knowledge base published on relevant subjects. The incident of interest was the Polish Air Force One TU-154M plane destruction on Apr. 10, 2010. We analyzed the image changes on micro-detail level tracked over time and considered with respect to the patterns of destruction and the plane debris size distribution in space against a broad engineering literature describing destruction patterns of thin walled structures, such as planes and cars. Then, we compared the spatial distribution of the debris between the pictures taken on different dates. Finally, we also considered on ground changes in soil moisture and landscape features between different images. The main conclusions from the study were that: (i) the pattern of the plane destruction debris and their spatial distribution found on the ground following the catastrophe was not consistent with expectations associated with a plane crash but rather was suggestive of a plane explosion; (ii) the scene and the plane debris were manipulated over time during the very initial period after the destruction; (iii) surprisingly the numerous heavy equipment vehicles present on the site , which were much larger than the image spatial resolution, were not recorded on any of the satellite images from Apr. 11, 12, or 14, 2010; (iv) the frequency of the high resolution satellite imagery captured around this airport on the dates of Apr. 5, 9, 11, 12, and 14, 2010, is intriguing given that the last captured image of this type prior to April 5, 2010, took place only in 2007; and (v) a large amount of snow-like high reflectivity coverage in the middle of the crash scene was followed by low reflectivity (suggestive of dry ground) areas following the crash despite generally swampy surroundings of the site and no reported explosion of the plane, which could imply a fast drying out of the melting snow large amounts of water.
Contemporary Journal Concept Press
2013-03-30 00:00:00
Peer-reviewed Multidisciplinary Works
application/pdf
http://mcfns.com/index.php/Journal/article/view/154
Mathematical and Computational Forestry & Natural-Resource Sciences (MCFNS); Vol 5, No 1: MCFNS March 30, 2013
eng
Smolensk, Russia
April 2010
High Resolution Satellite Images; photographs; journal publications;
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oai:ojs.mcfns.com:article/164
2023-10-19T15:42:10Z
Journal:MicroDetect
nmb a2200000Iu 4500
"130330 2013 eng "
1946-7664
dc
Micro-detail detections and their seemingly unrelated scientific inquiries
Green, Edwin J
Rutgers University http://deathstar.rutgers.edu/people/egreen/egreen.html
Array
This is an introduction of the initial publication of the new Special Section of the MCFNS journal on micro-detail detection and tracking problems and various related interdisciplinary studies in other disciplines, which are deemed to be synergistic or relevant to detection and tracking problems.  The initial selection of publications presented here arose from the Smolensk Conference held on Oct. 22, 2012, in Warsaw, Poland. This Special Section originated out of a collaboration between the MCFNS editors and the organizers of the Smolensk Conference, but the submissions of the presented here manuscripts was independent from this organization; all authors submitted their manuscripts independently of each other. This issue contains four of the papers presented at the conference. In what follows, I briefly review the background behind the creation of this Special Section series and introduce the papers contained herein.
Contemporary Journal Concept Press
2013-03-30 00:00:00
Peer-reviewed Multidisciplinary Works
application/pdf
http://mcfns.com/index.php/Journal/article/view/164
Mathematical and Computational Forestry & Natural-Resource Sciences (MCFNS); Vol 5, No 1: MCFNS March 30, 2013
eng
http://mcfns.com/index.php/Journal/article/download/164/928
http://mcfns.com/index.php/Journal/article/download/164/929
http://mcfns.com/index.php/Journal/article/download/164/932
Smolensk, Russia; worldwide applicable;
April 2010; contemporary;
Available documentations and review of sample studies
Copyright (c)