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Miscellaneous Machine Components
Published in Ansel C. Ugural, Youngjin Chung, Errol A. Ugural, MECHANICAL DESIGN of Machine Components, 2018
Ansel C. Ugural, Youngjin Chung, Errol A. Ugural
Thick-walled spheres are used as vessels in high-pressure applications (e.g., in deep-sea vehicles). They yield lower stresses than other shapes and, under external pressure, the greatest resistance to buckling.
Miscellaneous Mechanical Components
Published in Ansel C. Ugural, Mechanical Engineering Design, 2022
Thick-walled spheres are used as vessels in high-pressure applications (e.g., in deep-sea vehicles). They yield lower stresses than other shapes and, under external pressure, the greatest resistance to buckling.
Miscellaneous Mechanical Components
Published in Ansel C. Ugural, Youngjin Chung, Errol A. Ugural, Mechanical Engineering Design, 2020
Ansel C. Ugural, Youngjin Chung, Errol A. Ugural
Thick-walled spheres are used as vessels in high-pressure applications (e.g., in deep-sea vehicles). They yield lower stresses than other shapes and, under external pressure, the greatest resistance to buckling.
A Collision Avoidance Algorithm for Human Motion Prediction Based on Perceived Risk of Collision: Part 1-Model Development
Published in IISE Transactions on Occupational Ergonomics and Human Factors, 2021
James Yang, Brad Howard, Juan Baus
For digital human modeling (DHM), the employment of collision avoidance algorithms is not a new topic. Since the goal of optimization-based posture and motion prediction is to predict realistic postures and motions, it is necessary to fulfill the constraints of obstacle avoidance and self-avoidance when moving from an initial posture to a goal posture (Badler et al., 1994). Studies can be found in the literature detailing collision avoidance algorithms with specific application to DHM and optimization-based posture/motion prediction (Gragg et al., 2012; Howard et al., 2012; Howard & Yang, 2011a, 2011b; Kim et al., 2011; Marler et al., 2009; Xiang et al., 2021; Yang et al., 2004; 2011; Yang & Ozsoy, 2020). Most collision avoidance algorithms applied in the literature consist of populating objects in the environment with spheres or other geometrical shapes, including the object to be avoided and the body to be articulated (in this case, the human body). Spheres are mostly used due to their geometric uniformity. In order to realize collision avoidance, the geometrical objects are constrained within the models such that these geometries do not intersect. In the case of spheres, they are constrained such that the separation between sphere centers is greater than the sum of their respective radii (Howard et al., 2012; Howard & Yang, 2011a, 2011b; Marler et al., 2009; Xiang et al., 2010, 2016, 2021; Yang & Ozsoy, 2020).
Relationships between the internal erosion parameters and the mechanical properties of granular materials
Published in European Journal of Environmental and Civil Engineering, 2019
Nadjibou Abdoulaye Hama, Tariq Ouahbi, Said Taibi, Hanène Souli, Jean-Marie Fleureau, Anne Pantet
During the consolidation stage the isotropic stress of a particle assembly is defined as the mean of the direct stresses. The direct stresses and strains are measured with measurement spheres (at each single sphere). A numerical servo mechanism is applied iteratively to arrive at the sample’s radius expansion necessary to achieve the required mean stress.