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Zur Torsion der Kohomologie S-arithmetischer GruppenHesselmann, Sabine. January 1993 (has links)
Thesis (doctoral)--Rheinische Friedrich-Wilhelms-Universität Bonn, 1992. / Includes bibliographical references (p. 91-93).
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Lateral-torsional vibration of a side-loaded rotor with asymmetric shaft stiffness a thesis /Judd, Clinton Tyler, Wu, Xi. January 1900 (has links)
Thesis (M.S.)--California Polytechnic State University, 2010. / Title from PDF title page; viewed on June 10, 2010. Major professor: Xi Wu, Ph.D. "Presented to the faculty of California Polytechnic State University, San Luis Obispo." "In partial fulfillment of the requirements for the degree [of] Master of Science in Mechanical Engineering." "May 14, 2010." Includes bibliographical references (p. 46-47).
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A new equivalence principle test using a rotating torsion balance /Choi, Ki-Young, January 2006 (has links)
Thesis (Ph. D.)--University of Washington, 2006. / Vita. Includes bibliographical references (p. 104-105).
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Development of a general dynamic hysteretic light-frame structure model and study on the torsional behavior of open-front light-frame structuresXu, Jian, January 2006 (has links) (PDF)
Thesis (Ph. D. in civil engineering)--Washington State University, December 2006. / Includes bibliographical references (p. 210-217).
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Sensitivity Study of a Truck ChassisTeo, Chee Kong 13 December 2002 (has links)
In response to an increasingly demand for fuel-economy, more weight reduction techniques have been proposed to create an optimum vehicle chassis. Material selection and design modification are two of the vital techniques being investigated. In addition, ample attention has been dedicated towards improving the overall strength of a vehicle chassis. Specifically, the overall objective of this study is to maximize weight savings in a truck chassis, while improving its strength characteristics.
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Torsion theories, ring extensions, and group ringsLouden, Kenneth C. January 1975 (has links)
No description available.
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Torsion theories and localizations for M-setsGuruswami, Verena January 1976 (has links)
No description available.
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Maîtrise du vrillage de profils aérodynamiques par contrôle <réactif> / Twist mastering of aerodynamic profiles by a <reactive> controlRunge, Jean-Baptiste 09 December 2010 (has links)
La déformation de torsion que subit un profil aérodynamique a une importance capitale car elle a une influence directe sur la valeur des incidences locales et donc sur la valeur locale des densités de portance et de traînée. L'amélioration des performances aérodynamiques passe donc par la connaissance et la maîtrise de ce vrillage. Cette thèse se propose d'y contribuer. Une des méthodes développées actuellement par de nombreux auteurs consiste à munir le profil d'actionneurs permettant de le déformer en torsion de manière à compenser tout ou partie, voire même contrer, la déformation « naturelle » de la structure. Cette méthode, dite de contrôle actif, est certes très efficace, mais elle présente des limitations car elle nécessite l'introduction d'une quantité d'énergie qui peut être importante. La méthode que nous proposons ici pour maîtriser le vrillage du profil consiste à modifier ses conditions d'équilibre interne. En solidarisant ou en désolidarisant des cloisons à l'intérieur du profil, il est possible de déplacer le centre de torsion des sections du profil sans modifier sa forme extérieure. Ces modifications internes induisent donc une modulation du moment de torsion et donc une modulation du vrillage. Ce processus ne demande que très peu d'énergie. A partir d'un profil simple, des simulations ont permis de montrer le potentiel théorique du système proposé. Trois démonstrateurs, de complexité croissante, ont également été réalisés pour évaluer les capacités du contrôle « réactif » de la torsion. La technique a été validée par la deuxième démonstration. Malheureusement, le troisième démonstrateur, beaucoup plus complexe, n'a pas permis, à l’heure actuelle, d'obtenir la validation finale. / The torsional deformation of aerodynamic profiles has to be considered with care because it induces a change in the angle of attack and therefore changes in the local densities of lift and drag forces. The improvement of the aerodynamic performances does require a good knowledge and control of the twist of the airfoil. A method currently developed by a lot of authors consists in inserting in the airfoil some actuators whose action tends to increase or reduce the ‘natural’ deformation of the structure. This method, named active control, is very effective but it has some limitations because it needs a level of energy which can be high. The method we propose to control the twist of the airfoil consists in modifying the internal elastic equilibrium of the structure. By joining or disjoining some walls inside the profile, it is possible to shift the shear center of the profile without any change of its external shape. So, these internal modifications induce variations of the torsional moment and therefore a variation of the twist angle. The process is no energy consuming. By means of a simple profile, simulations have been performed to show the theoretical potential of the proposed system. Three demonstrators have also been designed with increasing complexity to evaluate the feasibility of the ‘reactive’ control of the twist. The technique has been validated by the second demonstrator. Unfortunately, the third demonstrator, much more complex, has not shown the final demonstration.
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The mechanics of braided compositesHarte, Anne-Marie January 1997 (has links)
No description available.
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Design of a Torsion Measurement System of High Stiffness and Sensitivity to Study Yield in Low Carbon Steels.Tuling, Alison S 15 February 2007 (has links)
Student Number : 9102778K -
MSc(Eng) dissertation -
School of Chemical and Metallurgical Engineering -
Faculty of Engineering and the Built Environment / Strain ageing anisotropy, a surprising property of iron, implies that interstitials,
which are non-lattice obstacles, can give non-symmetrical opposition to glide. Al-
though this has been investigated by others, it is shown that it is di±cult to eliminate
extraneous residual stresses during testing. An Avery torsion machine was adapted
for the study of strain ageing anisotropy through the design of a torque and twist
measurement system. This required the optimization of sensitivity, stiffness and me-
chanical stability criteria, while ensuring practicality. When a ¯ne-grained sample
with circumferential groove was tested a sharp yield point and lack of yield after
ageing in the reverse direction was observed. Although more testing is required, it
con¯rms the results of other researchers. In testing it was found that the quality
of the sample machining was critical in achieving an accurate yield, and the groove
design must be reviewed and improved. While the system measured to the required
torque resolution, the strain measurement system could be improved by redesign
and better calibration statistics.
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