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Macroergonomics
Published in Shatha N. Samman, Human Factors and Ergonomics for the Gulf Cooperation Council, 2018
Ontology refers to the specification of the conceptualization of a domain (Gruber, 1993). Fuzzy logic is the precise logic of imprecise things (Zadeh, 1965, 1973). Fuzzy logic allows reasoning using natural language and fuzzy rules. The evolute system supports online domain ontology-based applications, which target groups can use with natural language (Kantola, 2015). The evolute system computes and visualizes the perceived current reality and the future vision of objects—for example, organizational subsystems. The evolute system can therefore be used to design and develop work system components (i.e., people, organizations, technology, cultures, and processes). Figure 2.4 illustrates the process of the evolute approach.
An extensive analysis of frequency and transient responses in S and C-shaped gears
Published in Australian Journal of Mechanical Engineering, 2022
S. H. Yahaya, M. S. Salleh, Kenjiro T. Miura, A. Abdullah, A. R. M Warikh, Z. Jano
Radzevich (2012) defined gears or represented curves area set of geometric shapes confined by uniform teeth. Srikanth, Jeevanantham, and Nirmal (2014) stated that teeth may also be shown as the progressive projections connected in the rotating shafts. Hirani (2014) and Stadtfeld (2001) noted that the invaluable function of gears is to transmit the force or torque but it is also beneficial in a rotary motion and power production. Yahaya (2015) also stated that gears and transmission are two inseparable terminologies. Gears comprise two basic forms namely circular and noncircular forms. Circular form design uses a particular circle while the noncircular form is otherwise (Dejnozkova and Dokladal 2004). The circular types are spur, helical, rack and pinion, worm and bevel gearswhereasconical and elliptical gears are the common types of noncircular. Matsuura, Hashimoto, and Okuno (2013) discovered that an involute or known as evolvent curves has been appreciably used in circular form design since the seventeenth century. This statement is in rhyme with Dooner (2012) where Euler (1707–1783) and Huygens (1629–1695) invent the use of the involute curve in gears. Besides, noncircular gears or NCG utilise an evolute curve in designing its tooth profile. To gain a better understanding of involute and evolute curves, Fang et al. (2010) and Belyaev (2004) generally defined these curves as the creation of path or locus by some points known from tangent definition and centre of curvature.
Fertile metastability
Published in Liquid Crystals, 2023
with and . In the same Figure 1(c), the green curve called metacentric curve M is evolute of the buoyancy curve, i.e. locus of centres of curvature of B. Invented in 18th century by Pierre Bouguer [2], it is helpful in determination of the stability of ships: as long as the gravity centre G of the ship is located below the metacentre M, the ship will not capsize. In Figure 1(c), the green metacentric curve was calculated using expressions taken from the paper of Mégel and Kliava [1]: