Relevant bibliographies by topics / Torsion modes

Contents

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

Academic literature on the topic 'Torsion modes'

Author: Grafiati
Published: 4 June 2021
Last updated: 18 February 2022

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Journal articles on the topic "Torsion modes"

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Men, Jin Jie, Qing Xuan Shi, and Qiu Wei Wang. "Unity Equation of Torsional Capacity for RC Members Subjected to Axial Compression, Bend, Shear and Torque." Advanced Materials Research 163-167 (December 2010): 874–79. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.874.

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The mechanics performance of reinforced concrete members subjected to axial compression, bending, shear and torque is very complex. Several calculation models have been established to estimate the torsional capacity of combined torsion members; however, the calculation results of different models have a great variation. In this paper, variable-angle space truss model is adopted to analyze the mechanics performance of reinforced concrete members subjected to combined torsion. With respect to various shapes of specimens, various load modes, and various strength of concrete, a unity equation abou
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Jeong, Byeong-Woo. "Transitional Failure of Carbon Nanotube Systems under a Combination of Tension and Torsion." Journal of Nanomaterials 2012 (2012): 1–6. http://dx.doi.org/10.1155/2012/847307.

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Transitional failure envelopes of single- and double-walled carbon nanotubes under combined tension-torsion are predicted using classical molecular dynamics simulations. The observations reveal that while the tensile failure load decreases with combined torsion, the torsional buckling moment increases with combined tension. As a result, the failure envelopes under combined tension-torsion are definitely different from those under pure tension or torsion. In such combined loading, there is a multitude of failure modes (tensile failure and torsional buckling), and the failure consequently exhibi
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Senent, María Luisa, and Samira Dalbouha. "Large Amplitude Motions of Pyruvic Acid (CH3-CO-COOH)." Molecules 26, no. 14 (2021): 4269. http://dx.doi.org/10.3390/molecules26144269.

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Torsional and rotational spectroscopic properties of pyruvic acid are determined using highly correlated ab initio methods and combining two different theoretical approaches: Second order perturbation theory and a variational procedure in three-dimensions. Four equilibrium geometries of pyruvic acid, Tc, Tt, Ct, and CC, outcome from a search with CCSD(T)-F12. All of them can be classified in the Cs point group. The variational calculations are performed considering the three internal rotation modes responsible for the non-rigidity as independent coordinates. More than 50 torsional energy level
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Fan, Xiang-Dong, Qi Liu, Lin-Xia Liu, Vadim Milyukov, and Jun Luo. "Coupled modes of the torsion pendulum." Physics Letters A 372, no. 5 (2008): 547–52. http://dx.doi.org/10.1016/j.physleta.2007.08.020.

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Wang, Mei, Guo Ding Chen, and Yong Xiao. "Lightweight Analysis of Torsion Spring Based on Reliability Constraint in Multi-Failure Modes." Advanced Materials Research 308-310 (August 2011): 494–98. http://dx.doi.org/10.4028/www.scientific.net/amr.308-310.494.

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The generalized stress and strength distribution interference theory is introduced to establish the reliability model of torsion spring in multi-failure modes. Using it as constraint condition, the lightweight optimization model of torsion spring based on reliability constraint in multi-failure modes is presented. And then an optimization design for a given structure of torsion spring is made to use the theoretical model under operating conditions and the reliability constraint. The weight of the opti-mized torsion spring is lighter than that of non-optimization. This verified the validity of
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Cusumano, J. P., and D. C. Lin. "Bifurcation and Modal Interaction in a Simplified Model of Bending-Torsion Vibrations of the Thin Elastica." Journal of Vibration and Acoustics 117, no. 1 (1995): 30–42. http://dx.doi.org/10.1115/1.2873864.

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This paper presents a numerical study of bifurcation and modal interaction in a system of partial differential equations first proposed as a simplified model for bending-torsion vibrations of a thin elastic beam. A system of seven ordinary differential equations obtained using the first six bending and first torsional normal modes is studied, and Floquet theory is used to locate regions in the forcing frequency, forcing amplitude parameter plane where “planar” (i.e., zero torsion) motions are unstable. Numerical branch following and symmetry considerations show that the initial instability ari
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Krott, Matthew J., Edward C. Smith, and Christopher D. Rahn. "Coupled and Multimode Tailboom Vibration Control Using Fluidic Flexible Matrix Composite Tubes." Journal of the American Helicopter Society 64, no. 4 (2019): 1–10. http://dx.doi.org/10.4050/jahs.64.042007.

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This paper covers the modeling and testing of a helicopter tailboom integrated with a fluidic flexible matrix composite (F2MC) damped vibration absorber. In an advance over previous work, the F2MC absorber presented in this paper treats a combination of tailboom lateral, torsional, and vertical vibrations. A finite element structural model of a laboratory-scale tailboom is combined with a model of attached F2MC tubes and a tuned fluidic circuit. Vibration reductions of over 75% in a coupled 26.8-Hz lateral bending/torsion tailboom mode are predicted by the model and measured experimentally. Th
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Jrad, Wassim, Foudil Mohri, Guillaume Robin, El Mostafa Daya, and Jihad Al-Hajjar. "Analytical and finite element solutions of free and forced vibration of unrestrained and braced thin-walled beams." Journal of Vibration and Control 26, no. 5-6 (2019): 255–76. http://dx.doi.org/10.1177/1077546319878901.

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In this article, vibration of thin-walled beams with arbitrary open cross-section shape is investigated. Based on the beam element model accounting for warping and flexural–torsional coupling, analytical solutions for different boundary conditions are derived for higher free vibration modes in bending, torsion and flexural–torsional coupled modes. In the model, the effects of rotational inertial kinematic terms are considered. The finite element approach of the model is also investigated. Three-dimensional beams with seven degrees of freedom per node are adopted in the mesh process. Free vibra
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SETKIT, Monthian, Thanongsak IMJAI, Udomvit CHAISAKULKIET, et al. "Torsional Strengthening of Low-Strength RC Beams with Post-Tensioned Metal Straps: An Experimental Investigation." Walailak Journal of Science and Technology (WJST) 17, no. 12 (2020): 1399–411. http://dx.doi.org/10.48048/wjst.2020.11908.

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This article investigates the behaviour of low-strength reinforced concrete beams under pure torsion with and without strengthening. Four beams were cast and tested in torsion: i) a control beam without vertical reinforcement, ii) two beams with internal stirrups designed for shear and torsion demands using different stirrup spacing (50 and 100 mm), and iii) a beam having steel stirrups with a spacing of 100 mm strengthened using high ductile post-tensioned metal straps (PTMS). The main objective of the PTMS strengthening solution was to investigate the enhancement of torsional strength confin
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A. Rosly, N., M. Y. Harmin, and D. L. A. A. Majid. "Preliminary investigation on experimental modal analysis of high aspect ratio rectangular wing model." International Journal of Engineering & Technology 7, no. 4.13 (2018): 151. http://dx.doi.org/10.14419/ijet.v7i4.13.21348.

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Procedure of conducting an experimental modal analysis (EMA) of roving hammer test for high aspect ratio (HAR) wing containing geometric nonlinearities is presented along with consideration of various tip store sizes. Two sets of test setups of vertical and horizontal arrangements have been considered, which respectively demonstrates the undeformed and deformed cases. Modal properties in terms of natural frequency and mode shape were experimentally measured using the LMS Test.Lab package and the results were then compared between the undeformed and its corresponding deformed configuration. Fro
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Dissertations / Theses on the topic "Torsion modes"

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Gerick, Felix. "Modes magnéto-Coriolis rapides et couples de pression résultant des modes de torsion d'Alfvén dans les noyaux planétaires." Thesis, Université Grenoble Alpes, 2020. https://thares.univ-grenoble-alpes.fr/2020GRALU027.pdf.

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Le champ magnétique terrestre et le taux de rotation de la Terre changent sur des périodes de plusieurs années.Dans cette thèse, on cherche à savoir si et comment de tels changements peuvent être causés par des modes (ondes stationnaires) dans le noyau liquide et conducte.Pour ce faire, un modèle de noyau planétaire en rotation rapide et électriquement conducteur est développé, capable de gérer des champs magnétiques complexes et une frontière non sphérique.Nous exploitons la rotation rapide pour simplifier notre modèle, en utilisant l'hypothèse dite quasi-géostrophique, où les composantes hor
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Ponte, Felgueiras Olivier. "Nouvelle méthode d'évaluation de la santé d'un composite fondée sur l'interaction des modes de flexion et de torsion." Thesis, Université Paris sciences et lettres, 2020. http://www.theses.fr/2020UPSLM055.

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Au regard de l’intérêt porté aux matériaux composites (performance mécanique et réduction de masse), il est un domaine dans lequel leur utilisation est encore peu développée, notamment dans l’industrie du transport: les éléments de liaisons au sol (trains avant et arrière, éléments de suspension et de direction, ...). Afin de garantir la sûreté de fonctionnement de ces pièces de sécurité, il est indispensable d’être en mesure de bien les dimensionner dès la phase de conception, de valider correctement les organes prototypes et surtout, de savoir diagnostiquer, tout au long de leur durée de vie
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Glodic, Nenad. "Sensitivity of Aeroelastic Properties of an Oscillating LPT Cascade." Licentiate thesis, KTH, Kraft- och värmeteknologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-123504.

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Modern turbomachinery design is characterized by a tendency towards thinner, lighter and highly loaded blades, which in turn gives rise to increased sensitivity to flow induced vibration such as flutter. Flutter is a self-excited and self-sustained instability phenomenon that may lead to structural failure due to High Cycle Fatigue (HCF) or material overload. In order to be able to predict potential flutter situations, it is necessary to accurately assess the unsteady aerodynamics during flutter and to understand the physics behind its driving mechanisms. Current numerical tools used for predi
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Jrad, Wassim. "Dynamic behavior of thin-walled beams : Analytical, numerical and experimental approaches." Electronic Thesis or Diss., Université de Lorraine, 2019. http://www.theses.fr/2019LORR0271.

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Les poutres à parois minces à sections ouvertes sont des éléments de base des ouvrages courants en génie civil, de l'automobile et de l'aéronautique. En raison de leur élancement et la forme des sections, elles sont très sensibles à la torsion et aux instabilités aussi bien en statique qu’en dynamique. En dynamique, les modes de vibration en torsion sont plus dominants par rapport au modes de flexion classiques. Pour ces raisons, les défaillances planaires de telles structures sont connues pour être une exception plutôt qu'une règle. Dans ce travail de thèse, on s’intéresse au comportement dyn
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Parsons, Simon Paul. "Abelian dualities and sigma models." Thesis, University of Liverpool, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367188.

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Thomas, Jossian, and Barenys Assís Arañó. "Evaluation of 3D dynamic effects induced by high-speed trains on double-track slab bridges." Thesis, KTH, Bro- och stålbyggnad, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-188850.

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In addition to a static design, a dynamic analysis has to be performed for bridges for which the maximum permissible train speed exceeds 200 km/h. This analysis requires a lot of computing time, for this reason Svedholm and Andersson (2016) have developed a simple tool describing the relationship between the first eigenfrequency of the bridge, the span length and the minimum mass to fulfill the regulation specified in EN-1990. However, these diagrams are based on 2D beam models in which the 3D dynamic effects are not considered. An evaluation of the torsional modes has been performed by analyz
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Mirjalili, Vahid. "Modelling the structural efficiency of cross-sections in limited torsion stiffness design." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99780.

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Most of the current optimization techniques for the design of light-weight structures are unable to generate structural alternatives at the concept stage of design. This research tackles the challenge of developing an optimization method for the early stage of design. The main goal is to propose a procedure to optimize material and shape of stiff shafts in torsion.<br>Recently introduced for bending stiffness design, shape transformers are presented in this thesis for optimizing the design of shafts in torsion. Shape transformers are geometric parameters defined to classify shapes and to model
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Stryhalski, Joel. "Crescimento de trincas em fadiga torsional." Universidade do Estado de Santa Catarina, 2011. http://tede.udesc.br/handle/handle/1788.

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Made available in DSpace on 2016-12-08T17:19:38Z (GMT). No. of bitstreams: 1 CAPA - SUMARIO.pdf: 307847 bytes, checksum: 431911d5eb22b3080df0c9228cba482d (MD5) Previous issue date: 2011-07-19<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>With increasing competition and reliability in modern equipment, is of vital importance to studies on the structural fatigue life in the time domain and frequency domain, the advance speed and cost reduction in computing greatly simplifies the prediction fatigue life. But it is also necessary to know the modes of fatigue crack growth, and
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Johansson, Jonas. "Investigation of Mode Superposition as Modelling Approach for Crankshaft Torsion." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-69453.

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With tougher emission standards for heavy duty trucks, good control of the engine is of importance. By taking into consideration the torsional vibrations occurring in the crankshaft, the engine control can be improved. This could be done by implementing a torsion model that would give feedback to the engine control unit to reduce the cycle-to-cycle variations in the cylinders, which is partly due to the torsion in the crankshaft. It is therefore of interest to determine if a torsion model can be developed with a reduced computational complexity and still have sufficient accuracy. In this thesi
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Khademolhosseini, Farzad. "Nonlocal continuum shell models for torsion of single-walled carbon nanotubes." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/12549.

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Carbon nanotubes (CNTs) have attracted much attention from scientists and engineers because of their relevance to a wide range of applications. Various approaches have been used for the characterization of CNT properties, among which continuum modeling has generated much interest due to computational efficiency. However, at the nanoscale the dimensions of a system are comparable to the inter-atomic or inter-molecular spacing of that system, and the material cannot be modeled as a continuum. This is known as the “size-effect”. To overcome the limitations of classical continuum mechanics, modifi
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Books on the topic "Torsion modes"

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James P. Smith - undifferentiated. Highly accurate beam torsion solutions using the p-version finite element method. National Aeronautics and Space Administration, 1996.

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Takahashi, Marc D. A flight-dynamic helicopter mathematical model with a single flap-lag-torsion main rotor. NASA Ames Research Center, 1990.

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Sedarat, Hassan. Torsional response characteristics of regular buildings under different seismic excitation levels. California Dept. of Conservation, Division of Mines and Geology, Office of Strong Motion Studies, 1994.

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Atarod, Vida. Impact of synchronous machine constants and models on the analysis of torsional dynamics. National Library of Canada, 1992.

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Hudson, James W. Development and calibration of a torsional engine model for a three-cylinder, two-stroke diesel engine. Naval Postgraduate School, 1997.

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Swanson, William J. Determination of diesel engine cylinder gas torques from speed fluctuations with a high-fidelity crankshaft torsional model. Naval Postgraduate School, 1998.

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Sanford, Fleeter, and Lewis Research Center, eds. The predicted effect of aerodynamic detuning of coupled bending-torsion unstalled supersonic flutter. National Aeronautics and Space Administration, Lewis Research Center, 1986.

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A flight-dynamic helicopter mathematical model with a single flap-lag-torsion main rotor. NASA Ames Research Center, 1990.

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A flight-dynamic helicopter mathematical model with a single flap-lag-torsion main rotor. NASA Ames Research Center, 1990.

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Center, Ames Research, and United States. Army Aviation Research and Technology Activity., eds. A flight-dynamic helicopter mathematical model with a single flap-lag-torsion main rotor. NASA Ames Research Center, 1990.

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Book chapters on the topic "Torsion modes"

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Kandil, Osama A., Essam F. Sheta, and C. H. Liu. "Effects of Coupled and Uncoupled Bending-Torsion Modes on Twin-Tail Buffet Response." In IUTAM Symposium on Dynamics of Slender Vortices. Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5042-2_34.

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Sun, Ling, and Elmar Bonaccurso. "Scanning Conductive Torsion Mode Microscopy." In Surface Science Tools for Nanomaterials Characterization. Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-44551-8_6.

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Thomas, T. "8 Softened Truss Model for Torsion." In Unired Theory of Reinforced Concrete. CRC Press, 2017. http://dx.doi.org/10.1201/9780203734650-9.

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Cleja-Tigoiu, Sanda. "Elasto-Plastic Models with Dislocations Based on Configuration with Torsion." In Continuum Models and Discrete Systems. Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2316-3_33.

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Arnold, David M., Adolf Mader, Otto Mutzbauer, and Ebru Solak. "A Remak-Krull-Schmidt Class of Torsion-Free Abelian Groups." In Groups, Modules, and Model Theory - Surveys and Recent Developments. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-51718-6_3.

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Garrett, Steven L. "Modes of Bars." In Understanding Acoustics. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-44787-8_5.

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Abstract The perspectives and techniques developed in the previous chapters will now be applied to calculation of wave propagation in solids. Their application to longitudinal and shear waves will be both familiar and simple. Even more satisfying is the success of those same techniques in finding solutions for waves in a system that does not obey the wave equation and exhibit a phase speed that varies with frequency. Measurement of the frequencies of the normal modes of thin bars will be used to determine the bars’ elastic constants to high precision. The relationship between measured modal frequencies and the elastic moduli is particularly simple because the torsional, flexural, and longitudinal modes of bars can be selectively excited and detected. The technique of resonant ultrasound spectroscopy will allow the extraction of moduli from resonance frequencies even for samples with dimensions that are not as conducive as those of thin bars by a process that is significantly more computationally intensive. The flexural rigidity of wires under tension will be analyzed to determine the normal modes of a “stiff string,” and those effects will be discussed in relation to the tuning of pianos
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Zhao, Qian. "Study on Driveline Component Torsional Stiffness Effect on RWD Driveline Torsional Vibration Modes." In Lecture Notes in Electrical Engineering. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-33832-8_7.

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Gu, Yu Jiong, Xiao Bo Li, and Cheng Bing He. "Correction on Parameters in Torsion Vibration Model for Turbine-Generator Shafts." In Key Engineering Materials. Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-456-1.2505.

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Doughty, Timothy A., Willamette Blvd, Mary LeBlanc, Lee Glascoe, and Joel Benier. "Torsion/compression Testing of Grey Cast Iron for a Plasticity Model." In Experimental and Applied Mechanics, Volume 6. Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-9792-0_117.

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Tesi, Maria Carla. "Geometrical Entanglement in Lattice Models of Ring Polymers: Torsion and Writhe." In Numerical Methods for Polymeric Systems. Springer New York, 1998. http://dx.doi.org/10.1007/978-1-4612-1704-6_6.

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Conference papers on the topic "Torsion modes"

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Vyas, Ashwin, Anil K. Bajaj, and Dimitrios Peroulis. "Nonlinear Resonator With Interacting Flexural-Torsional Modes for Mass Sensing." In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-35117.

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We explore the use of a pedal shaped nonlinear microresonator designed with torsion and flexural modes in 1:2 internal resonance for mass sensing. The higher natural frequency in-plane flexural mode of the resonator is coupled nonlinearly through inertial coupling to the out-of-plane torsional mode with one-half natural frequency. When the flexural mode excited resonantly has response above a threshold, the torsional mode is excited. This response in torsional mode is highly sensitive to any mass perturbation that results in mistuning the two modes away from 1:2 resonance. The mistuning can dr
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Arafat, Haider N., and Ali H. Nayfeh. "Transfer of Energy From High- to Low-Frequency Modes in the Bending-Torsion Oscillation of Cantilever Beams." In ASME 1999 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/detc99/vib-8159.

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Abstract We investigate the nonlinear bending-torsion response of a cantilever beam to a transverse harmonic excitation, where the forcing frequency is near the natural frequency of the first torsional mode. We analyze the case where the first in-plane bending mode is activated by a nonresonant mechanism. We use the method of time-averaged Lagrangian and virtual work to determine the equations governing the modulations of the phases and amplitudes of the interacting modes. These equations are then used to investigate the nonlinear behavior of limit-cycle oscillations of the beam as the excitat
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Wu, Shanghua, Zhixun Yang, Jinlong Chen, et al. "Study on the Failure Mechanism of Flexible Pipes Under Large Torsion Considering the Layer Interaction." In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-77710.

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Flexible pipe is the typical multi-layer structure which is designed to resist different loads when it is utilized under the severe deep-water environment. However, there is not any structural layer to withstand the torsion specially. Tension armors are only arranged to bear the tension with consideration of the torque balance. Especially, when flexible pipe is loaded out from the cargo vessel to the installation vessel, twist angle could be accumulated at high level so that all of layers need to resist the torsion. So, the failure mechanism is very complicated due to the interaction effect be
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Chiang, Hsiao-Wei D., and Chih-Neng Hsu. "Prediction of Shrouded Turbomachinery Blade Forced Response by a Complex Mode Analysis." In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-90112.

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Turbomachinery shrouded rotor blade design has been widely used in fans, compressors, and turbines. By using either tip or mid-span shroud, the blade structural damping and natural frequencies can be increased to reduce flutter or forced response problems. However, shrouded rotor blade design sometimes results in complex system modes with both bending and torsion present at the same time. Since shrouded rotors are rotationally periodic, the bending and torsion combined system mode can be decomposed into a real component and an imaginary component. Using both the real and imaginary mode shapes,
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Xu, Li-Hong. "Torsion-vibration energy structure and interactions among the lower vibrational modes of 13cd3oh." In 17th International Conference on Infrared and Millimeter Waves. SPIE, 2017. http://dx.doi.org/10.1117/12.2298239.

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DeSmidt, Hans A., K. W. Wang, and Edward C. Smith. "Coupled Torsion-Lateral Stability of a Shaft-Disk System Driven Through a Universal Joint." In ASME 2001 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/detc2001/vib-21423.

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Abstract Understanding the instability phenomena of rotor-shaft and driveline systems incorporating universal joints is becoming increasingly important because of the trend towards light-weight, high-speed supercritical designs. A non-dimensional, periodic, linear time-varying model with torsional and lateral degrees-of-freedom is developed for a rotor shaft-disk assembly supported on a flexible bearing and driven through a U-Joint and stability is investigated with Floquet Theory. It is shown that the interaction between torsional and lateral dynamics results in new regions of parametric inst
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Vijith, P. P., and Suresh Rajendran. "Horizontal and Torsional Modes of an Ultra Large Container Ship (ULCS)." In ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/omae2020-18659.

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Abstract The hydro elastic responses of flexible structures under fluid loading is an important concern during the design of large ocean structures. The two-way coupling between the structural responses and the hydrodynamic loads is a complex problem in large flexible floating structures since the structures can vibrate in longitudinal, vertical, horizontal, or torsional modes. The antisymmetric distortion modes may be coupled depending on the location of the centroid and the shear centre. In the case of thin walled open structures, horizontal and torsional vibrations are usually coupled due t
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Abdo, Jamil, Edris M. Hassan, Khaled Boulbrachene, and Jan Kwak. "Modeling and Experimental Investigations of Drill Pipe Failure." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-70369.

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During drilling operations, drill string interacts continuously with rock formation, which result in severe shock and vibrations. Lateral, torsion and axial vibration modes often cause failures of Bottom Hole Assembly (BHA), drill pipe abrasive wear, drill bit and wall borehole damages. It also leads to reduction in Rate of Penetration (ROP) and consequently incur unnecessarily high costs. The Lagrangian approach has been used in this study to attain drill pipe lateral and torsional vibration coupling equations of motion. The mathematical model is expressed in terms of four independent degrees
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Saneian, Mohsen, Yifan Gao, Yong Bai, and Ting Liu. "Analysis of Subsea Umbilical Mechanical Behavior Under Simultaneous Bending, Tension and Torsion." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-96596.

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Abstract One of the major failure modes of an umbilical is found to occur under simultaneous bending, tension and torsion. Umbilical cables are compatible in bending but have a rigid response to tension and torsion, hence validation the axisymmetric performance of it, is a significant matter. This paper has applied theoretical models to analyze umbilical cables mechanical behavior under combined loading. Lanteigne (1985) theoretical model, which its feature is a large-diameter central pipe umbilical cross section with homogeneous materials that a number of wires helically wrapped around it, is
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Chiang, Hsiao-Wei D., Chi-Chin Chen, Chih-Neng Hsu, Gwo-Chung Tsai, and Kwang-Lu Koai. "An Investigation of Turbomachinery Shrouded Rotor Blade Flutter." In ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/gt2003-38311.

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Turbomachinery shrouded rotor blade design has been widely used in fans, compressors, and turbines. By using shroud design, the blade structural damping can be increased to prevent blade flutter. However, the shrouded rotor blade design will cause the blade mode shapes to be complex, and in some cases both bending and torsion mode components can be present at the same time in a single mode. Therefore, a complex mode analysis was developed to predict shrouded rotor blade flutter with these bending and torsion combined system modes. Using the blade natural frequencies and mode shapes from a fini
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Reports on the topic "Torsion modes"

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Reedlunn, Benjamin, and Wei Yang Lu. An attempt to calibrate and validate a simple ductile failure model against axial-torsion experiments on Al 6061-T651. Office of Scientific and Technical Information (OSTI), 2015. http://dx.doi.org/10.2172/1167405.

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Michalski, A,, D. Andersson, R. Rossi, and C. Soriano. D7.1 DELIVERY OF GEOMETRY AND COMPUTATIONAL MODEL. Scipedia, 2021. http://dx.doi.org/10.23967/exaqute.2021.2.020.

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This document describes the industrial application, on which the developments of the project are implemented, and the CFD set-up. The developments are implemented over six analysis cases with increasing complexity starting from a 2D geometry with mean wind inflow to a 3D geometry with turbulent inflow and real-time shape optimization. The application represents the CAARC tall building model, which has served as a benchmark model for many studies since the 1970’s when it was first developed. Base moments (bending and torsional moments) of the building are extracted for validation by comparison
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3

Badia, S., A. Martín, J. Principe, C. Soriano, and R. Rossi. D3.1 Report on nonlinear domain decomposition preconditioners and release of the solvers. Scipedia, 2021. http://dx.doi.org/10.23967/exaqute.2021.2.021.

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This document describes the industrial application, on which the developments of the project are implemented, and the CFD set-up. The developments are implemented over six analysis cases with increasing complexity starting from a 2D geometry with mean wind inflow to a 3D geometry with turbulent inflow and real-time shape optimization. The application represents the CAARC tall building model, which has served as a benchmark model for many studies since the 1970’s when it was first developed. Base moments (bending and torsional moments) of the building are extracted for validation by comparison
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