Relevant bibliographies by topics / Rigidness

Academic literature on the topic 'Rigidness'

Author: Grafiati
Published: 30 May 2022
Last updated: 31 May 2022

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Journal articles on the topic "Rigidness"

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Förste, Stefan, and Ivonne Zavala. "Oddness from rigidness." Journal of High Energy Physics 2008, no. 07 (July 21, 2008): 086. http://dx.doi.org/10.1088/1126-6708/2008/07/086.

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Baser, Muhittin, Fatma Kaynarca, and Tai-Keun Kwak. "RIGIDNESS AND EXTENDED ARMENDARIZ PROPERTY." Bulletin of the Korean Mathematical Society 48, no. 1 (January 31, 2011): 157–67. http://dx.doi.org/10.4134/bkms.2011.48.1.157.

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Astakhova, Lyubov I., Ivan V. Astakhov, Anastasiya A. Yukhnina, and Anna A. Limonina. "Research of changes in the parameters that affect the rigidness of the column-foundation joints." Vestnik MGSU, no. 8 (August 2021): 986–96. http://dx.doi.org/10.22227/1997-0935.2021.8.986-996.

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Introduction. The existing types of connection assignment in the design scheme — hinged and absolutely rigid joints — do not reflect the actual operation of the connection. The lack of calculation of the actual rigidness of joint and its failure to take into account in the design of the frame can lead to a different distribution of efforts from the calculated one and an increase in the movement of the frame elements. The purpose of this work is to researching the influence of the change size of the elements forming the column base on its rotational rigidity. Materials and methods. The calculation of the transverse frame was performed in the Dlubal RFEM software package. The calculated efforts acting in the lower section of the column were transferred to the calculated models of the column base, made in the IDEA StatiCa software package, in which the further calculation of the joint rigidness was performed. Results. The rotational rigidness of the joints with different structural solutions of the column base is determined. The change in the rigidness of the connection between the column and the foundation with an increase in the thickness and height of the support ribs is analyzed. Based on the calculations, graphs of the identified dependencies are constructed. As an example of strengthening the base of the column, the introduction of a traverse was proposed. The article considers six variants of the traverse device, and variants with three support ribs and with traverses, but without support ribs. The calculated rigidness of the column bases is summarized in graphs, where it can be seen that the metal adding is effective only up to a certain point. Variants of the arrangement of column bases with additional transverse ribs are considered. Conclusions. The greatest contribution to the increase in the rotational rigidness of the joint is made by the addition of a traverse. By increasing the thickness or height of the introduced traverse, it is impossible to achieve absolutely rigid fixing, it is necessary to change several parameters in a complex way. The introduction of additional ribs located outside the plane of action of the moment practically does not affect the rigidity of the joint.
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Karapetyan, M. A., N. B. Orlov, and D. G. Kuzmin. "Effective design of protection module for passive safety of cabs." Traktory i sel hozmashiny 81, no. 10 (October 15, 2014): 44–46. http://dx.doi.org/10.17816/0321-4443-65555.

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Yin, Xiaodong, Yali Qiao, Matthew R. Gadinski, Qing Wang, and Chuanbing Tang. "Flexible thiophene polymers: a concerted macromolecular architecture for dielectrics." Polymer Chemistry 7, no. 17 (2016): 2929–33. http://dx.doi.org/10.1039/c6py00233a.

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Highly flexible and transparent free-standing films can be readily obtained from oligothiophene-containing norbornene polymers and their hydrogenated derivatives prepared by ROMP. The rigidness/softness of the polymer backbone and polar side chains dictate dielectric properties.
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Janelidze, Zurab, and Nelson Martins-Ferreira. "Involution-rigidness — a new exactness property, and its weak version." Journal of Algebra and Its Applications 16, no. 04 (April 2017): 1750074. http://dx.doi.org/10.1142/s0219498817500748.

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In this paper, we introduce and study a new exactness property in the sense of categorical algebra, which can be seen as a natural strengthening of the well-known Mal’tsev property. A variety of universal algebras has this exactness property if and only if its algebraic theory contains binary terms [Formula: see text] and an [Formula: see text]-ary term [Formula: see text] satisfying [Formula: see text], and [Formula: see text] for each [Formula: see text]. We also study the “weak” version of this exactness property, which similarly strengthens the “weak Mal’tsev property” in the sense of the second author.
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Arriagada, Waldo, and João Fialho. "Parametric rigidness of germs of analytic unfoldings with a Hopf bifurcation." Portugaliae Mathematica 73, no. 2 (2016): 153–70. http://dx.doi.org/10.4171/pm/1981.

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B, Reddaiah, and Srinivasa Rao K. "Rigidness in Applying Scrum by an Enterprise – Influenced by Muscle Memory." International Journal of Engineering and Technology 9, no. 3 (June 30, 2017): 2353–57. http://dx.doi.org/10.21817/ijet/2017/v9i3/1709030295.

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Li, Fangyuan, Peifeng Wu, and Dongjie Liu. "Experimental study on the cable rigidness and static behaviors of AERORail structure." Steel & Composite structures 12, no. 5 (May 25, 2012): 427–44. http://dx.doi.org/10.12989/scs.2012.12.5.427.

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Hu, Zhongjian, Jianhua Liu, Lauren Simón-Bower, Lei Zhai, and Andre J. Gesquiere. "Influence of Backbone Rigidness on Single Chain Conformation of Thiophene-Based Conjugated Polymers." Journal of Physical Chemistry B 117, no. 16 (January 10, 2013): 4461–67. http://dx.doi.org/10.1021/jp308497k.

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Dissertations / Theses on the topic "Rigidness"

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Богачов, Віктор Євгенійович. "Вибір оптимального конструктивного виконання вуглепластикової стінки нервюри крила літака з умов міцності, жорсткості та стійкості." Master's thesis, КПІ ім. Ігоря Сікорського, 2020. https://ela.kpi.ua/handle/123456789/39552.

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Дана магістерська дисертація за обсягом роботи складає 88 сторінок, 49 ілюстрацій, 14 таблиць та містить посилання на 10 літературних джерел. У даній роботі досліджена задача вибору оптимального конструкційного виконання вуглепластикової стінки нервюри крила літака з точки зору міцності, жорсткості та втрати стійкості. За результатами виконаних аналітичних розрахунків відповідних характеристик для стінок нервюр з підкріплюючими ребрами, гофрованих стінок нервюр і тришарових стінок встановлено, що найбільш ефективною стінкою нервюри з точки зору жорсткості та стійкості є синусоїдальна стінка з кутами укладення 0° та 30°, а найбільш ефективною стінкою нервюри з точки зору міцності є стінка з поперечними ребрами . Розроблено алгоритм, який дає можливість визначати оптимальне конструкційне виконання вуглепластикової стінки нервюри з точки зору міцності, жорсткості та втрати стійкості. Сформульовані рекомендації для вибору оптимального варіанту конструктивного виконання стінки нервюри. Найбільш ефективну нервюру після додаткових досліджень та стендових випробувань можна використовувати в конструкції крила та оперення. Що в свою чергу дає можливість зменшення маси літака, а отже збільшення паливної ефективності літака та кращі конкурентні якості літака на міжнародному ринку.
This master's degree dissertation for the amount of work is 88 pages, 49 illustrations, 5 tables and contains 10 literature. In this paper, we investigated the problem of choosing the optimal design of the carbon fiber rib web of an aircraft wing in terms of strength, stiffness and buckling. According to the results of the performed analytical calculations of the corresponding characteristics for rib walls with reinforcing ribs, corrugated rib walls and three-layer walls, it was found that the most effective rib wall in terms of rigidity and stability is a sinusoidal wall with confinement angles of 0 ° and 30 °, and the most effective rib wall from the point of view of strength, it is a wall with transverse ribs. An algorithm has been developed that makes it possible to determine the optimal design of the carbon fiber rib wall in terms of strength, stiffness and buckling. Recommendations are formulated for choosing the optimal design option for the rib wall. The most effective rib, after additional research and bench tests, can be used in the wing and tail structure. This, in turn, makes it possible to reduce the mass of the aircraft, and therefore increase the fuel efficiency of the aircraft and the best competitive qualities of the aircraft in the international market.
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Book chapters on the topic "Rigidness"

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Bialynicka-Birula, Iwona, and Roberto Grossi. "Amortized Rigidness in Dynamic Cartesian Trees." In STACS 2006, 80–91. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/11672142_5.

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Govindaraju, Divya, Gururaj Nagarajan, and Paramasivam Alagumariappan. "Assessment of Gait Disorder in Parkinson's Disease." In Early Detection of Neurological Disorders Using Machine Learning Systems, 108–27. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-8567-1.ch007.

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Neurological disorders are some of the leading chronic disorders that impose a massive burden on low-income and developing countries. The disability resulting from the neurological disorder increases the severity and costs during the primary healthcare and for entire lifetime. Parkinson's disease (PD) is the second most common chronic neurodegenerative disorder which is slowly progressive with decrease in the motor and non-motor function of the nervous system due to cognitive impairment leading to gait abnormality. PD is most common in the age group of 40-65years leading to increase in gait disorders associated with slowing down of the movement, balance instability, rigidness in the muscles, and difficulty in performing everyday tasks. The assessment of gait plays a significant role in maintaining the balance disorders in Parkinson's disease. In patients with PD, the neurons present in substantia nigra region of the brain get injured, and they progressively decline during their lifetime. Therefore, the patients lose their ability to perform movement and also lose their stability. The symptoms of PD can be monitored and controlled by assessing gait parameters based on gait disorder.
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Govindaraju, Divya, Gururaj Nagarajan, and Paramasivam Alagumariappan. "Assessment of Gait Disorder in Parkinson's Disease." In Research Anthology on Diagnosing and Treating Neurocognitive Disorders, 626–44. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-3441-0.ch032.

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Neurological disorders are some of the leading chronic disorders that impose a massive burden on low-income and developing countries. The disability resulting from the neurological disorder increases the severity and costs during the primary healthcare and for entire lifetime. Parkinson's disease (PD) is the second most common chronic neurodegenerative disorder which is slowly progressive with decrease in the motor and non-motor function of the nervous system due to cognitive impairment leading to gait abnormality. PD is most common in the age group of 40-65years leading to increase in gait disorders associated with slowing down of the movement, balance instability, rigidness in the muscles, and difficulty in performing everyday tasks. The assessment of gait plays a significant role in maintaining the balance disorders in Parkinson's disease. In patients with PD, the neurons present in substantia nigra region of the brain get injured, and they progressively decline during their lifetime. Therefore, the patients lose their ability to perform movement and also lose their stability. The symptoms of PD can be monitored and controlled by assessing gait parameters based on gait disorder.
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Conference papers on the topic "Rigidness"

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Sun, A. L., X. L. Tan, J. Zhang, X. L. Zuo, and W. Peng. "Static Rigidness Test Analysis of Some Body-in-White Car." In 2015 International Conference on Environmental Science and Sustainable Development (ICESSD 2015). WORLD SCIENTIFIC, 2016. http://dx.doi.org/10.1142/9789814723039_0063.

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Qing-xuan, Jia, Chu Ming, and Sun Han-xu. "Research on the Numerical Method of Nonlinear Rigidness/Flexibility Coupling Dynamics Equations of Flexible-Joint Flexible-Link Space Manipulator." In 2009 Second International Conference on Intelligent Computation Technology and Automation. IEEE, 2009. http://dx.doi.org/10.1109/icicta.2009.456.

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Myszkowski, Adam, Tomasz Bartkowiak, and Andrzej Gessner. "Kinematics of a Novel Type Positioning Table for Cast Alignment on Machine Tool." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-46067.

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The paper presents a study into the kinematics of a novel type of a rotary positioning table based on the constrained parallel mechanism. Fixture and leveling a workpiece on a machine tool table is an essential stage in machining or layout process. In this study, a compact low-height rotary table is presented for automated leveling, which can be mounted directly on the machine tool table without a significant decrease of the workspace. The authors propose a modification of parallel mechanism by introducing four extensible leg design with specific geometrical constraint for workpiece positioning and in order to achieve higher rigidness. The table is driven by four hydraulic linear actuators which are integrated in the linkages. The designed model allows to rotate the table about the sphere center about three independent axis. Procedures using meta-heuristic methods were implemented to optimize the geometrical dimensions of the entire mechanism for the required workspace.
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Galle, Timothy, Wim De Waele, and Patrick De Baets. "Effect of Make-Up on the Structural Performance of Standard Buttress Connections Subjected to Tensile Loading." In ASME 2013 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/pvp2013-97282.

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When establishing oil wells, pipe sections are connected by means of threaded couplings. In an effort to minimize the possibility of failure by jumpout, standard buttress connections were introduced. Part of their strength is directly acquired as a result of radial interference during make-up. This paper discusses the results of a numerical study evaluating the effect of make-up on the performance of a standard 4.5 inch API buttress connection when axial tensile force is applied. In order to characterize the structural performance, the load distribution along the coupling length is evaluated, combined with a parameter defining thread separation. The latter is indicative for jumpout and the tendency of creating a leak path throughout the thread helix. From the results it is clear that relative axial displacement within the coupling occurs, even when made up, because of an initial clearance among the load and stab flanks. This clearance may cause a connection to leak through the thread helix when available thread compound cannot heal this leak path. Despite undesirable effects on the sealability and rigidness of this joint, such a clearance is required to decrease frictional forces during make-up while maintaining the desired radial interference.
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Nix, Anthony A., Mark T. Lemke, Ryan M. Arlitt, and Robert B. Stone. "Design Education Across Disciplines: Opportunities for Curriculum Advancement." In ASME 2016 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/detc2016-59767.

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Design education is a large field. It is not just limited to engineering design but can also include apparel design, industrial design, graphic design, architecture, and many others. These disciplines instruct students to follow a similar design process to what is generally taught in engineering design. However, these other disciplines contain a variety of instructional techniques, class structures, and class types that are not regularly included in engineering design. While design engineers tend to get a background rich in math and science, instructing students in design can be difficult. Many of these math and science classes focus on one approach and one right answer. However, in design the answers tend to fall on a spectrum from unsatisfactory to varying levels of satisfactory to ideal and innovative solutions, all of which can be uncovered using widely varying design methods. Despite the rigidness of the mechanical engineering curriculum there are areas where the implementation of techniques used in the other design disciplines could be advantageous to help engineering design students improve students design skills, design process knowledge, and softer skills such as team communication. The research done in this paper examines how the curricula of design disciplines could influence the coursework of students focusing on the design area of mechanical engineering.
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Gudmundsson, Ketill H., Fjola Jonsdottir, and Freygardur Thorsteinsson. "Field-On Versus Field-Off Characteristics of Magnetorheological Fluids With an Application in Prosthetic Devices." In ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2011. http://dx.doi.org/10.1115/smasis2011-4932.

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The study presents an experimental investigation into the trade-offs between field-on versus field-off rheological characteristics of magnetorheological (MR) fluids. This is relevant in a particular application in prosthetic devices where field-off characteristics are of equal importance to the field-on rheological characteristics. The paper introduces a biomechanical prosthetic knee joint that uses an MR fluid to actively control its rotary stiffness while an amputee walks. The knee is a synergy of artificial intelligence, advanced sensors and MR actuator technology. The knee joint is equipped with an MR rotary brake, utilizing the fluid in direct-shear mode. The MR fluid has response time in the order of milliseconds, making it possible to vary the knee’s stiffness in real-time, depending on sensors data. The field-on characteristics of the employed MR fluid define the rigidness of the knee joint while the field-off characteristics define its flexibility in the absence of a magnetic field. Five MR fluid compositions are prepared, each with a different solid loading ranging from 0.25 to 0.35, by volume. All fluids employ a commercially available carbonyl iron powder and a base fluid. The MR fluids are experimentally evaluated in a rheometer, where both field-off and field-on characteristics are measured. An MR fluid figure of merit function is introduced which is used to rate the selected MR fluids for a potential application in the MR prosthetic knee. An MR fluid composition is sought with the highest ratio between the field-on shear yield stress and the off-state viscosity. The research shows the off-state viscosity to decrease faster than the field-on shear yield stress when reducing the solid loading from 0.35 to 0.25. This suggests that an optimum solid loading exists with regards to the defined merit function. The off-state viscosity of suspensions is known to be exponentially dependent on solid loading while the field-on shear-yield stress is known to sub-quadratically dependent on solid loading. Field-on and field-off models are presented from literature. The models compared to the experimental data and used to theoretically predict the optimum solid loading with regards to field-on shear yield stress and off-state viscosity. As a result of the experimental and the theoretical analysis, a prominent MR fluid composition is selected for a potential application in the MR prosthetic knee. This has been shown to help in the development of prosthetic devices and furthering the success of an MR prosthetic knee joint.
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