By Jaroslav Beran, Martin Bílek, Petr Žabka
This ebook offers the newest advances within the study of machines and mechanisms. It collects fifty four reviewed papers awarded on the XII overseas convention at the idea of Machines and mechanisms (TMM 2016) held in Liberec, Czech Republic, September 6-8, 2016.
This quantity bargains a global collection of crucial new effects and advancements, grouped in six diverse elements, representing a well-balanced evaluation, and spanning the final concept of machines and mechanisms, via research and synthesis of planar and spatial mechanisms, linkages and cams, robots and manipulators, dynamics of machines and mechanisms, rotor dynamics, computational mechanics, vibration and noise in machines, optimization of mechanisms and machines, mechanisms of fabric machines, mechatronics to the regulate and tracking platforms of machines.
This convention is generally organised each 4 12 months lower than the auspices of the overseas business enterprise IFToMM and the Czech Society for Mechanics.
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Additional info for Advances in Mechanism Design II: Proceedings of the XII International Conference on the Theory of Machines and Mechanisms
F ¼ F l ð1Þ The deflection between two bodies in contact may produce a flat of width 2b and length l (see Fig. 2) with coordinates O, x, y, z located in its centre. The flat is situated at the coordinate plane xy where the axis x coincides with the contact area of non-loaded bodies. Contact load distribution p(y) along the elliptic cylinder is (2). 2f p¼ pb rﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃ y 2ﬃ 1À b ð2Þ Hertzian pressure is a maximum compressive stress pH deﬁned as (3). 2f ¼ pH ¼ pb sﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃ À Á f 2 q y Æ 1 q y pðd1 þ d2 Þ1 qy 2 qy ð3Þ Unlike the positive radius of curvature of the roller follower 1ρy, the radius of curvature of the cam surface in contact 2ρy may attain both, positive or negative values.
1007/978-3-319-44087-3_5 37 38 L. Rybak et al. such mechanisms—an approach based on the use of graph theory, screw theory and group theory. Freudenstein ﬁrst proposed the use of graph theory for synthesis purposes . He has developed a graph scheme in which vertices correspond to communication mechanisms, and ribs—the hinges. The ﬁrst graph theory to the development of new architectures of parallel robots applied Earle . , parallelograms). Another currently applied approach is based on the use of groups of motions.
3. We can see a considerable difference in used methods results in the graph (see Fig. 3) for load/life curves. Model A [calculation by Eq. (8)] is more on side of the safety. Table 1 Material characteristics of the steel 12 024 Young’s modulus of elasticity Shear modulus Poisson’s ratio Ultimate strength Yield strength Rockwell hardness Stress factor 1 Stress factor 2 Fig. 06 Life Estimation of the Contact Surfaces 49 4 Conclusions We have used in most cases only Model A for determination of the material for cam producing in VÚTS.