Important when thin plain steel bars are considered, as is the case of the tested The bondīetween the bars and the embedding concrete, by incorporating a bond stress-slipīehaviour law in the numerical calculations is considered, an effect particularly Used allowing for realistic simulations of the non linear behaviour, which wasįound particularly suitable when significant shear effects are involved. The non linear effects have a crucial role. Phenomena involving the global behaviour of the structural elements and where As is well known, the shear effects are complex The concrete constitutive law and a suitable cyclic behaviour law for steel bars The numerical strategy was based on refined 3D Finite Element Mesh (FEM) discretization using a two-scalar variable damage model for The numerical simulations performed for some of the referred piers in order toīetter understand phenomena associated with its cyclic behaviour, as observed in University of Porto (FEUP) on several reduced scale (1:4) RC hollow sectionīridge piers under lateral cyclic loading with constant axial force reported byĭelgado (Bull Earthquake Eng 7:377-389, 2009). In that framework, tests were carried out at Laboratory ofĮarthquake and Structural Engineering (LESE) from Faculty of Engineering. The significant influence of shear effects on these piers behaviour, particularly Several studies in the recent past, from which one important drawn conclusion is Reinforced concrete (RC) hollow section piers have been the subject of (Wang et al., J Mech Eng Sci, 230(9):1521–1531, 2016), we mainly propose an idea for calculating the sliding friction losses using dynamics instead of static method or quasi-static method. The formula of sliding friction losses is given, and the meshing efficiency considering the sliding friction losses in helical gear pair is calculated. ![]() Second, the tooth surface meshing force and relative sliding/entrainment velocity are calculated and brought into the formula of sliding friction coefficient. The parameters associated with the calculation of sliding friction loss are obtained. ![]() First, the dynamic model of helical gear pair considering friction and multiple backlashes is built and solved. Therefore, a calculation method for helical gear pair of sliding friction losses based on dynamic characteristics is proposed. The efficiency of dynamic state of a helical gear pair is studied, because it is widely used in the middle- and high-speed transmission. The tooth surface meshing force, relative sliding/entrainment velocity, and sliding friction coefficient are obtained under static or quasi-static conditions which restrict the accuracy of model in the middle. ![]() The author has proposed a calculation method of sliding friction losses considering the transmission errors. Sliding friction losses play a significant role in power losses of a gearbox.
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