Relevant bibliographies by topics / Mechanical jack

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Mechanical jack'

Author: Grafiati
Published: 4 June 2021
Last updated: 17 February 2022

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Journal articles on the topic "Mechanical jack"

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Sainath, K. "Design of Mechanical Hydraulic Jack." IOSR Journal of Engineering 4, no. 7 (July 2014): 15–28. http://dx.doi.org/10.9790/3021-04711528.

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Viale, Nicola, Federico Accornero, Giuseppe Lacidogna, and Giulio Ventura. "AE Characterization of Brick Masonry Walls Mechanical Behavior: The Case-Study of Alessandria and Boves Barracks." Key Engineering Materials 817 (August 2019): 563–70. http://dx.doi.org/10.4028/www.scientific.net/kem.817.563.

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IIn the present study, Acoustic Emission (AE) monitoring technique is applied in order to characterize the brick masonry of two important military buildings located in Northern Italy: the barracks of Alessandria and Boves. The internal brick masonry walls of the two barracks object of the study are tested by two double flat-jack systems, in order to analyze the compressive strength of the structural material. Flat-jack testing is a versatile and powerful technique that provides significant information on the mechanical properties of historical constructions. The first applications of this technique on some historical monuments clearly showed its great potential. The flat-jack test method is only slightly destructive, and when double jacks are used, this test works according to the same principle as a standard compressive test. The difference is that it is performed in situ and the load is applied by means of two flat-jacks instead of the loading platens. During the tests, the stress-strain relationship of the masonry is determined by gradually increasing the pressure applied by the flat-jacks in the course of three loading-unloading cycles. Moreover, AE technique is coupled to the flat-jack testing, in order to assess the extent of damage in the masonry texture. Thus, AE technique makes it possible to highlight critical phenomena and fracture mechanics scale effects in the masonry by identifying the critical conditions, not entrusted to an analysis of the loading process (compression or shear), rather depending primarily on the distribution and evolution of crack patterns.
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Wu, Hong Sheng, Hua Wei, Yu Zou, Jun Ming Ma, and Hai Jun Wang. "Mechanical Analysis on Incremental Launching for the Steel Box Girder." Applied Mechanics and Materials 633-634 (September 2014): 1248–51. http://dx.doi.org/10.4028/www.scientific.net/amm.633-634.1248.

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Houdingxiang No. 3 Bridge is a 4-span steel box girder bridge. After the incremental launching construction, the bridge has to be lowering to the support bear, the lowering construction is divided into three stages. At first the launching equipment is used to lower 80cm, the next the jack with load capacity of 180 tons is used to lower 110cm, finally three-direction-jack with load capacity of 200 tons is used to lower 20cm. mechanical analysis on lowering the bridge used jacks with the load capacity of 180 tons and 200 tons is respectively carried out by FEM software ABAQUS, and the result shows that this kind of lowering technique is safe and reliable, it meets the construction demand.
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Nelson, Martin K. "Mechanical Weeding of Overstocked Jack Pine Stands." Northern Journal of Applied Forestry 7, no. 3 (September 1, 1990): 137. http://dx.doi.org/10.1093/njaf/7.3.137.

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Trevelyan, James. "Obituary: Jack Phillips." Mechanism and Machine Theory 44, no. 6 (June 2009): 1095–96. http://dx.doi.org/10.1016/j.mechmachtheory.2009.02.005.

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Li, Shu Min. "Development & Design of Large-Tonnage and Great-Height Hydraulic Continuous and Synchronous Jack-Up System." Applied Mechanics and Materials 157-158 (February 2012): 577–80. http://dx.doi.org/10.4028/www.scientific.net/amm.157-158.577.

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At present, as the increasing of ultra-large structures, the contradiction that domestic lifting equipments can not meet the requirement of ultra-large structure’s lifting has become increasingly prominent. Based on the need of ultra-large steel structures (offshore oil platforms) jack-up, using strength theory and finite element analysis, a hydraulic continuous jack-up system for ultra-large structures’ jack-up was studied in this article. A new control system, which combines mechanics, hydraulics and electrics, was presented. More particularly, the modules of speed control and multi-cylinder synchronous control for the ultra-large structure’s lifting was designed. In the WINCC environment, a human-computer interface (control software) was developed by VB to achieve the system's real time monitoring and synchronization control. All movements of the jack-up system could be controlled through the software. To conclude, the jack-up system consists of two parts: the mechanical support structures and the control system. The former can assure great height (10m or more) jack-up, and the later can accomplish multi-point (more than 4 points) synchronous jack-up.
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Simões, A., R. Bento, A. Gago, and M. Lopes. "Mechanical Characterization of Masonry Walls With Flat-Jack Tests." Experimental Techniques 40, no. 3 (April 26, 2016): 1163–78. http://dx.doi.org/10.1007/s40799-016-0114-9.

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Šimšik, Dušan, Alena Galajdová, Pavol Galajda, and Miloš Drutarovský. "Mechanical Modul with Jack-Screw for SMILING Rehabilitation Shoe." Acta Mechanica Slovaca 14, no. 2 (October 31, 2010): 98–105. http://dx.doi.org/10.2478/v10147-011-0027-7.

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Hagiwara, Tetsuto, and Shigeo Hirose. "Development of Dual Mode X-screw -A Novel Load-Sensitive Linear Actuator with a Wide Transmission Range-." Journal of Robotics and Mechatronics 12, no. 2 (April 20, 2000): 66–71. http://dx.doi.org/10.20965/jrm.2000.p0066.

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X-screw, a load-sensitive linear actuator that we have proposed, has many desirable characteristics, but one drawback is that the linear motion is much slower than a conventional lead screw. When the axial load is small, the transmission efficiency of X-screw is approximately the same as that of a lead screw since the transmitted power is low in this case. Therefore we have developed a Dual Mode version of X-screw called ""DM X-screw"". This mechanism is able to automatically switch between lead screw mode and X-screw mode in response to the axial load. This feature makes it possible to apply DM X-screw to many mechanical systems. We have used this mechanism in a pantograph jack that makes use of its dual mode loadsensitive variable transmission properties. This jack can be operated with a small input force and unlike conventional jacks, several of these jacks can be used in combination to overcome the output force limitations of normal pantograph jacks.
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Velișcu, Viorica, Dan Mesarici, and Păun Antonescu. "Structural and Static Analysis of the Mechanisms Used in Car Mechanical Jacks." Applied Mechanics and Materials 823 (January 2016): 277–82. http://dx.doi.org/10.4028/www.scientific.net/amm.823.277.

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The paper presents a structural analysis of the complex mechanisms type screw-jack. The mechanism mobilityanalysis using various generally applicable formulas has been performed. A newkinematic scheme of the jack linkage has been proposed. Besides the actuatorscrew, it has a planar kinematic chain with articulated bars. With regard tothis new mechanism, an algorithm for static calculus has been developed, inwhich the automobile gravity force is the main exterior force.
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Dissertations / Theses on the topic "Mechanical jack"

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Jantač, Martin. "Zvedák závodního automobilu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229989.

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This thesis deals with a project of a lever-jack used for a race car. Its aim is to design a suitable model responding to all needs of such mechanism. The work itself is divided into several chapters. The first chapter is mainly theoretical, focusing on introduction of different types of lever-jacks. Further on, two engineering designs were created (mechanical and hydraulic). Kinematic calculation and strength calculation of some selected parts were done for each of these designs.
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Drha, Vojtěch. "Mechanické zajištění hydraulických zdvihacích systémů pro jevištní techniku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-382048.

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The aim of this thesis is to design a mechanical position securing of hydraulic elevating systems for stage technology. The first part includes an overview of present state of elevating systems and their securing solutions. The second part determines technical parameters and design of a chosen solution together with control and design calculations. Final part analyses suggested solution in terms of security.
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Myers, Peter. "Corrosion fatigue and fracture mechanics of weldable high strength jack up steels." Thesis, University College London (University of London), 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298428.

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Etube, Linus Sone. "Variable amplitude corrosion fatigue and fracture mechanics of weldable high strength jack-up steels." Thesis, University College London (University of London), 1998. http://discovery.ucl.ac.uk/1317699/.

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The tubular welded joints used in the construction of Offshore structures can experience millions of variable amplitude wave induced stress cycles during their operational life. Fatigue has been identified as the main cause of degradation of structural integrity in these structures. As a result, fatigue is an important consideration in their design. Jack-up legs are made from a range of high strength steels with yield strengths up to 70OMPa. These steels are thought to exhibit fatigue resistance properties which are different when compared with conventional fixed platform steels such as BS 4360 50D and BS 7191 355D. The difference in their behaviour was heightened by the discovery, in the late 80s and early 90s, of extensive cracking around the spud can regions of several Jack-ups operating in the North Sea. It was thought that these steels may be more susceptible to hydrogen cracking and embrittlement. There was the additional requirement to study their behaviour under realistic loading conditions typical of the North Sea environment. This thesis contains results of an investigation undertaken to assess the performance of a typical high strength weldable Jack-up steel under realistic loading and environmental conditions. Details of the methodology employed to develop a typical Jack-up Offshore Standard load History (JOSH) are presented. The factors which influence fatigue resistance of structural steels used in the construction of Jack-up structures are highlighted. The methods used to model the relevant factors for inclusion in JOSH are presented with particular emphasis on loading and structural response interaction. Results and details of experimental variable amplitude corrosion fatigue (VACF) tests conducted using JOSH are reported and discussed with respect to crack growth mechanisms in high strength weldable Jack-up steels. Different fracture mechanics models for VACF crack growth prediction are compared and an improved generalised methodology for fast assessment of Offshore structural welded joints is proposed.
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Bienen, Britta. "Three-dimensional physical and numerical modelling of jack-up structures on sand." University of Western Australia. School of Civil and Resource Engineering, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0208.

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Mobile offshore jack-up drilling rigs are not custom-designed for a particular location but rated for typical operating characteristics, like water depths. They may be deployed at a number of different sites during their design life. Under the current guidelines, the jack-up is required to be assessed for its suitability for each new proposed location, assuming environmental loading conditions due to wind, waves and current corresponding to a 50-year return period storm applicable to the site. Traditionally, these assessments have been performed in two dimensions, simplifying the jack-up to a plane frame and the loading conditions to be in-plane with the rig's 'axis of symmetry'. This thesis introduces a computer program, named SOS_3D, for the fluid-structure-soil interaction analysis of jack-up response in three dimensions. Extensive experimental series have been performed to provide evidence for the generalisation of the foundationsoil interaction model to general six degree-of-freedom loading conditions and its applicability to load paths and stress levels relevant to jack-up spudcans. These experiments included (1) 1g single footing tests, (2) centrifuge single footing tests and (3) centrifuge model jack-up tests. The latter tests highlighted differences in response and mode of failure depending on the loading direction of the jack-up and re-iterated the importance of three-dimensional modelling. The numerical program SOS_3D introduced early in this thesis was shown to represent a useful tool for the prediction of jack-up behaviour under general combined loading in three dimensions. It provided reasonably good, conservative predictions of the experimentally measured jack-up behaviour.
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Vice, President Research Office of the. "Newswire." Office of the Vice President Research, The University of British Columbia, 2008. http://hdl.handle.net/2429/2661.

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UBC's research community recently received a significant boost in financial support for five research hubs that will join the Centre for Brain Health as newly appointed national Centres of Excellence for Commercialization and Research (CECR). Two UBC economics professors were recognized with separate Bank of Canada awards: the Research Fellowship 2008 and the Governor's Award. UBC's Brain Research Centre has recevied $25 million from the Province of BC to establish a new facility focused on translational brain research.
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Books on the topic "Mechanical jack"

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S, Kirkaldy J., Hawbolt E. B, Yue S, and Conference of Metallurgists (34th : 1995 : Vancouver, B.C.), eds. Phase transformations during the thermal/mechanical processing of steel: Proceedings of the International Symposium on Phase Transformations During the Thermal/Mechanical Processing of Steel - honouring Professor Jack Kirkaldy, Vancouver, British Columbia, August 20-24, 1995. Montreal: Canadian Institute of Mining, Metallurgy and Petroleum, 1995.

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Jack Haney. Markham, Ont: Fitzhenry & Whiteside, 1989.

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Fred Dibnah: A tribute. Barnsley, South Yorkshire: Wharncliffe, 2009.

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Jack. Little Jack of All Trades: Or, Mechanical Arts Described, in Prose and Verse. Nabu Press, 2010.

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Chiari, Sophie. ‘Vat is the clock, Jack?’: Shakespeare and the Technology of Time. Edinburgh University Press, 2018. http://dx.doi.org/10.3366/edinburgh/9781474427814.003.0011.

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Sophie Chiari opens the volume’s last section with an exploration of the technology of time in Shakespeare’s plays. For if the lower classes of the Elizabethan society derived their idea of time thanks to public sundials, or, even more frequently in rural areas, to the cycles and rhythms of Nature, the elite benefited from a direct, tactile contact with the new instruments of time. Owning a miniature watch, at the end of the 16th century, was still a privilege, but Shakespeare already records this new habit in his plays. Dwelling on the anxiety of his wealthy Protestant contemporaries, the playwright pays considerable attention to the materiality of the latest time-keeping devices of his era, sometimes introducing unexpected dimensions to the measuring of time. Chiari also explains that the pieces of clockwork that started to be sold in early modern England were often endowed with a highly positive value, as timekeeping was more and more equated with order, harmony and balance. Yet, the mechanization of time was also a means of reminding people that they were to going to die, and the contemplation of mechanical clocks was therefore strongly linked to the medieval trope of contemptus mundi.
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Parker, Philip M. The 2007-2012 World Outlook for Mechanical Automobile Jacks Excluding Hydraulic and Pneumatic Jacks. ICON Group International, Inc., 2006.

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Parker, Philip M. The 2007-2012 Outlook for Mechanical Automobile Jacks Excluding Hydraulic and Pneumatic Jacks in Japan. ICON Group International, Inc., 2006.

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Parker, Philip M. The 2007-2012 Outlook for Mechanical Automobile Jacks Excluding Hydraulic and Pneumatic Jacks in India. ICON Group International, Inc., 2006.

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Parker, Philip M. The 2007-2012 Outlook for Mechanical Automobile Jacks Excluding Hydraulic and Pneumatic Jacks in Greater China. ICON Group International, Inc., 2006.

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Parker, Philip M. The 2007-2012 Outlook for Mechanical Automobile Jacks Excluding Hydraulic and Pneumatic Jacks in the United States. ICON Group International, Inc., 2006.

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Book chapters on the topic "Mechanical jack"

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Ab. Nasir, Ahmad Fakhri, Ahmad Shahrizan Abdul Ghani, and M. Nordin A. Rahman. "Parallel Guided Image Processing Model for Ficus Deltoidea (Jack) Moraceae Varietal Recognition." In Lecture Notes in Mechanical Engineering, 487–503. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-8788-2_44.

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Casarin, Filippo, Meir Ronen, Yaacov Schaffer, Raffaele Italia, Massimo dalla Benetta, Matthew R. Kyler, and Elvis Cescatti. "Mechanical Characterization of Masonry Typologies in Israel via Flat Jack Tests." In RILEM Bookseries, 625–33. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-99441-3_67.

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Tacas, Kiyoshi, Mauricio Gonzales, and Rafael Aguilar. "Mechanical Characterization of Adobe Constructions Using Flat Jack Tests: Case Study of the Virgen de la Asunción de Sacsamarca Church." In RILEM Bookseries, 706–15. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-99441-3_76.

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Husbands, Philip, Owen Holland, and Michael Wheeler. "An Interview with Jack Cowan." In The Mechanical Mind in History, 430–44. The MIT Press, 2008. http://dx.doi.org/10.7551/mitpress/9780262083775.003.0019.

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Pinheiro, Patrick, Paulo Fernandes, Pedro Santos, and Hugo Rodrigues. "Mechanical Characterisation of Masonry Walls with Flat-Jack Tests." In Nondestructive Techniques for the Assessment and Preservation of Historic Structures, 53–73. CRC Press, 2017. http://dx.doi.org/10.1201/9781315168685-4.

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Connerty, Michael. "Mechanical animals, flying men and educated monkeys: Technology and modernity in the comic strips of Jack B. Yeats." In Irish Modernisms. Bloomsbury Academic, 2022. http://dx.doi.org/10.5040/9781350177390.ch-014.

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Tedesco, J. W., D. Bloomquist, and T. E. Latta. "Impact stresses in A-Jacks concrete armor units." In Computational Fluid and Solid Mechanics, 499–501. Elsevier, 2001. http://dx.doi.org/10.1016/b978-008043944-0/50692-2.

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Konieczka, Robert. "Analiza możliwości przeprowadzenia wstępnej identyfikacji zakresu pracy zespołu napędowego samolotu przed wypadkiem na podstawie charakterystyki uszkodzenia śmigła po zdarzeniu." In Mechanika w Lotnictwie ML-XIX 2020, 67–73. Instytut Techniczny Wojsk Lotniczych, Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2020. http://dx.doi.org/10.15632/ml2020/67-73.

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Artykuł stanowi próbę znalezienia prawidłowości w uszkodzeniach śmigła samolotu w zależności od zakresu pracy zespołu napędowego. Wybór takiego tematu wynikał z potrzeb określenia przybliżonego zakresu pracy zespołu napędowego podczas zaistnienia wypadku lotniczego. Szczególnie istotne jest to w sytuacji, gdy brak jest innych możliwych do identyfikacji danych dotyczących zakresu pracy zespołu napędowego takich jak zapisy rejestratorów czy zeznania wiarygodnych świadków. Artykuł bazuje na analizie uszkodzeń zaistniałych podczas kilkunastu wypadków z udziałem samolotu wyposażonego w śmigła przy znanym zakresie prędkości obrotowej zespołu napędowego. Źródło tej wiedzy stanowią ogólnie dostępne raporty PKBWL. Na tej podstawie formułowane są ogólne prawidłowości dotyczące zakresu uszkodzeń. Jednoznaczne wyniki zaburza wpływ innych czynników istotnych, takich jak np. prędkość lotu, charakter podłoża, geometria zderzenia. Na tej podstawie autor próbuje sformułować przybliżone ogólne prawidłowości, określić czynniki wpływające na nieścisłość oceny oraz wskazać dalsze działania w celu osiągnięcia postawionych celów badawczych.
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Krzymień, Wiesław. "Wpływ pilota na właściwości drganiowe układów sterowania lekkich samolotów." In Mechanika w Lotnictwie ML-XIX 2020, 109–17. Instytut Techniczny Wojsk Lotniczych, Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2020. http://dx.doi.org/10.15632/ml2020/109-117.

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Analiza właściwości aeroelastycznych konstrukcji latających jest wymagana przepisami budowy. Elementem analizy są badania rezonansowe konstrukcji, których wyniki są potrzebne do wykonania obliczeń, jak również stanowią podstawę przeprowadzenia badań dowodowych w locie. Badania rezonansowe obejmują także układy sterowania w zakresie wychylania lub skręcania powierzchni sterowych. W przypadku konstrukcji lekkich i ultralekkich oddziaływanie pilota może istotnie zmienić właściwości drganiowe układów sterowania. Przeprowadzone badania miały na celu określenie wpływu pilota na układ sterowania przez dołożenie masy ręki i sztywności ramienia do drążka oraz nóg do pedałów. Wyniki pomiarów pozwalają na dobranie masy zastępczej ręki lub rąk oraz nóg podczas badań rezonansowych, a także uwzględnienie jej w obliczeniach właściwości flatterowych lekkich konstrukcji. W artykule przedstawiono metodę pomiarów oraz podstawowe wyniki badań przeprowadzonych na specjalnie przygotowanym stanowisku.
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Kozakiewicz, Adam, Stanisław Kachel, and Katarzyna Kozakiewicz. "Budowa modelu łopatki turbiny wysokiego ciśnienia lotniczego silnika turbinowego." In Mechanika w Lotnictwie ML-XIX 2020, 95–108. Instytut Techniczny Wojsk Lotniczych, Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2020. http://dx.doi.org/10.15632/ml2020/95-108.

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Artykuł poświęcony jest budowie modelu łopatki turbiny wysokiego ciśnienia lotniczego silnika turbinowego. Przedstawiono ideę procesu projektowania łopatki turbiny i w tym obszarze parametrów własnych turbiny, które zawarto w analizie charakterystyk turbin. Przedstawiono charakterystyki dotyczące zmian głównych parametrów własnych turbiny, tzn. masowego natężenia przepływu, pracy jednostkowej, sprawności, obciążenia czy rozprężu turbiny od parametrów eksploatacyjnych. Przeanalizowano proces tworzenia modelu łopatki w oparciu o inżynierię odwrotną i parametryzację modelu dla potrzeb poniższej pracy. Algorytm tworzenia modelu parametrycznego został zbudowany w języku GRIP dla systemu Siemens NX. Zawarto najważniejsze zalety modelu parametrycznego wraz z matematycznym równoważnikiem wyboru wariantu procesu modelowania obiektu wirtualnego. Przedstawiono efekt budowy modelu w postaci wydruku łopatki w 3D. Uzyskany model będzie podstawą dalszych badań w zakresie charakterystykach aerodynamicznych dotyczącym pojedynczej łopatki, jak również palisady.
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Conference papers on the topic "Mechanical jack"

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Zaman, Izzuddin, Shiau Wei Chan, and Mohd Shahrir Mohd Sani. "Design Analysis of Mechanical Jack for Assembling Canopy." In the 2017 International Conference. New York, New York, USA: ACM Press, 2017. http://dx.doi.org/10.1145/3036290.3036300.

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Senthilkumar, R., P. Ramesh, and P. Velmurugan. "Modeling of optimal screw jack design." In International Conference on Frontiers in Automobile and Mechanical Engineering (FAME 2010). IEEE, 2010. http://dx.doi.org/10.1109/fame.2010.5714853.

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Emami Azadi, M. R. "Influence of Spud-Can-Soil Interaction Modeling and Parameters on the Reliability Index of Neka Drilling Jack-Up Platform." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-66092.

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In the present study, the influence of spud-can-soil modeling and parameters on the reliability index of jack-up platform is investigated. Neka platform is studied as a case which is a 3-leg drilling jack-up type platform located in water depth of about 91m in Caspian Sea region. Various spud-can-soil interaction models such as pinned, fixed-base, hyper-elastic and non-linear elasto-plastic spud-can models are applied. The soil type is varied from loose to dense sand and also from soft NC-clay to very stiff OC-Clay. The effects of bias and COV of the spud-can-soil interaction modeling and also the soil parameters such as effective interface soil friction angle and also un-drained shear strength of clayey soil are studied. The results showed that inclusion of spud-can-soil interaction may have a considerable effect on the reliability of the Jack-up platform. In particular, the bias and COV of soil shown to have more significant influence on the reliability of jack-up platform in loose sand and soft clayey type soils. It is also found that bias in strength modeling of jack-up itself has less profound effect on the reliability index of the jack-up-foundation-soil system. Importance factors of spud-can-soil modeling are found to be quite considerable. The key aspect is that the inclusion of jack-up-spud-can-soil interaction is more crucial with respect to the reliability of jack-up platform than the choice of interaction model itself.
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Godoy, Francisco J., and Fernando Lorenzo. "Dynamic Analysis of a Jack-Up Rig, SDOF Approach: Design Consideration — I." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-63031.

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A jack up rig, such as those used for oil drilling in the Gulf of Mexico, is a dynamic sensitive system subjected to random and periodic environmental loads (wave, wind, current, etc.), in which the inertia forces cannot be ignored. However, a static load analysis approach can be justified only if an extra inertial load set, due to the dynamic effect response, is included in the analysis. The Society of Naval Architects and Marine Engineers, SNAME T&R 5-5A, “Guidelines for Site Specific Assessment of Mobile Jack-Up Units”[1], addresses the calculation of the inertial load set by using the classical Single Degree of Freedom (SDOF) analogy to calculate such dynamic effect. This study evaluates how far apart crucial structural members’ stresses/loads obtained by using the SDOF analogy method are from those values obtained from a more realistic modal dynamic analysis. The analysis is performed for wave loads at different heights and frequencies such as those existing on extreme or severe design conditions as a storm. Although a jack up rig structure presents some non-linearities, especially in the legs-hull contact areas and the spud-cans interaction with the soil; a modal superposition analysis can be used if proper linearization is considered. The results of this study for a jack show that the SDOF analogy method tends to underestimate the base shear loads for high wave periods and conversely overestimate some stresses on crucial members, such as the legs’ chords close to the hull for all the wave periods. This study shows that the stresses on one of the legs’ chord of the most loaded leg, due to the dynamic effect produced by the harmonic loads calculated with the SDOF analogy developed in this study tend to be overestimated as the wave period decreases. Conversely, the calculation of the base shear of the structure employing a quasi-static analysis with inertial load set (ILS) as calculated in this study shows that the base shear forces difference between the modal dynamic analysis and the quasi static analysis tends to decrease as the periods of the wave decreases.
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Zhang, Hui-Xia, Wei-Qing Huang, Yong-qiang Liu, and Wen-xian Tang. "OPTIMIZATION RESEARCH OF JACK-UP STRUCTURE BASED ON ANSYS and RELIABILITY." In 2015 International Conference on Material Engineering and Mechanical Engineering (MEME2015). WORLD SCIENTIFIC, 2016. http://dx.doi.org/10.1142/9789814759687_0090.

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Harris, Gerald F., and John DeRosia. "Occupant Protection and Standup Forklift (Lift Truck) Dynamics." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-43175.

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This paper investigates dynamic standing postural stability during standup forklift operation through a series of live subject tests to determine the sensitivity to loss of stability and falling. Through a set of controlled tests, the tolerance to accelerations in the lateral, oblique, and longitudinal orientations is determined. The levels of acceleration causing loss of balance are in close agreement with earlier studies and support the use of a door in the case of a standup forklift and the use of a control corridor in the case of a pallet jack (walkie-rider) during routine operation.
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Hollander, Kevin W., Thomas G. Sugar, and Donald E. Herring. "A Robotic “Jack Spring”™ for Ankle Gait Assistance." In ASME 2005 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/detc2005-84492.

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A Robotic ‘Jack Spring’™ is a new type of mechanical actuator, which is based upon the concept of structure control. A Jack Spring™ mechanism is used to create an adjustable Robotic Tendon, which is a spring based linear actuator in which the properties of a spring are crucial to its successful use in gait assistance. Like its human analog, the adjustable Robotic Tendon uses its inherent elastic nature to reduce both peak power and energy requirements for its motor. In the ideal example, peak power required of the motor for ankle gait is reduced from 250W to just 81 W. In addition, ideal energy requirements are reduced from nearly 36 Joules to just 25 Joules per step. Using this approach, an initial prototype is expected to provide 100% of the power and energy neccessary for ankle gait in a compact 0.84kg package. This weight is 8 times less than that predicted for an equivalent direct drive approach.
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Goodarzi, Avesta, and Ebrahim Esmailzadeh. "An Optimal Vehicle Stability Enhancement Strategy for Articulated Vehicles." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-15439.

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Rollover and jack-knifing of articulated heavy trucks are serious threats for motorists. Active safety technologies have been demonstrated to have potential to reduce or prevent the occurrence of these types of accidents. The vehicle dynamic control (VDC) system utilizes differential braking to affect vehicle response and has been shown to be quite effective in controlling vehicle yaw response. A VDC system that improves the yaw and lateral motions of an articulated vehicle has been developed. For this purpose, an optimal yaw-moment control law has been designed and the optimal values of the controller gains have been determined. The results of the numerical computer simulation show that very good performance of the proposed control system could be achieved.
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Barnett, Ralph L., and John B. Glauber. "Automotive Lifts: Unrestrained vs. Restrained Swing Arms." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-10053.

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To perform automotive maintenance, there are many makeshift ways of lifting and holding a vehicle including the use of forklifts, overhead hoists and cranes, jacks of every kind, jack stands and various ramp systems. When automobiles fall from these devices, the causes are usually obvious and we disapprovingly tolerate the risk taking. On the other hand, when a vehicle falls from a dedicated automotive lift, the accident is entirely unacceptable. This paper examines several hidden dangers associated with a particular class of lifts that are “frame engaging.” Various styles of these lifts use four cantilevered arms to elevate and support vehicles on adapter pads positioned on the arms’ free ends. If the vehicle slides off of one or more pads, it usually falls catastrophically. The cantilevered arms, when raised, are supposed to be restrained against rotation in a horizontal plane. When restrained, the arms provide a robust structural system for resisting horizontal workplace forces that tend to slide vehicles off the pads. The arms maintain the horizontal locations of the adapters by developing bending and axial planar resistance. If, on the other hand, the arms are free to pivot due to sloth or poor design, their structural behavior is dramatically transformed. The planar bending resistance of the arms completely disappears and they become direct stress diagonal truss members; the vehicle itself unwittingly becomes the truss’ tension chord. The appearance of the fixed and pivoting systems is the same; however, the truss action magnifies the horizontal forces acting on the adapter pads increasing the slip probability. Indeed, depending on the orientation of the pivoting swing arms, any finite horizontal force applied to a vehicle may lead to an unbounded tangential “slide-out” force. This is, of course, a theoretical possibility, not a practical reality.
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Bisrat, Y., C. C. Chen, Z. P. Luo, C. G. Chao, D. Davis, and D. Lagoudas. "Fabrication of Bi Nanowires Using a Vacuum Melting and Mechanical Injection Technique." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-15974.

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A mechanical pressure injection technique has been developed to fabricate uniform metallic nanowires in the pores of anodic aluminum oxide (AAO) template. The AAO template was prepared from general purity aluminum by a two-step anodization followed by heat treatment to achieve highly ordered nanochannels. The nanowires were fabricated by an injection process using a hydraulic pressure method. A mold containing the AAO template and a metal foil was placed inside a vacuum chamber and heated up to the melting temperature of the given metal using a hot plate. The hot chamber was then removed from the hot plate and pressure was applied on the melt through the sliding column of the chamber, using a hydraulic jack to impregnate the molten metal into the nanochannels of the AAO. The nanowires were found to be dense and continuous with uniform diameter throughout their length. Diffraction experiment in the transmission electron microscope revealed that individual nanowires are single crystalline. This paper will present the fabrication process of the AAO template, and the fabrication of Bi nanowires as well as their characterization conducted using SEM, TEM, XRD and DSC.
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Reports on the topic "Mechanical jack"

1

Mechanic crushed by bus falling off jack. U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, August 1999. http://dx.doi.org/10.26616/nioshsface99ne018.

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Two mechanics crushed to death when tow truck falls from jack stand. U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, December 1999. http://dx.doi.org/10.26616/nioshsface98ia071.

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Mechanic dies when bus falls off jack stands and crushes him in California. U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, November 1999. http://dx.doi.org/10.26616/nioshsface99ca006.

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Mechanic crushed when the dozer he was lowering shifted and fell off the jack - Massachusetts. U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, March 2015. http://dx.doi.org/10.26616/nioshsface13ma002.

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A mechanic dies when struck in the head by a forklift that slipped off a jack. U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, September 2001. http://dx.doi.org/10.26616/nioshsface01ca001.

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A maintenance mechanic died when the forklift he was working on slipped off a jack and fell on him. U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, March 2003. http://dx.doi.org/10.26616/nioshsface03ca005.

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