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Abstract
This article lists some tips for reducing gear case noise. With this aim, a static analysis was carried out in order to describe how stresses resulting from meshing gears affect the acoustic emissions. Different parameters were taken into account, such as the friction, material, and lubrication, in order to validate ideas from the literature and to make several comparisons. Furthermore, a coupled Eulerian–Lagrangian (CEL) analysis was performed, which was an innovative way of evaluating the sound pressure level of the aforementioned gears. Different parameters were considered again, such as the friction, lubrication, material, and rotational speed, in order to make different research comparisons. The analytical results agreed with those in the literature, both for the static analysis and CEL analysis—for example, it was shown that changing the material from steel to ductile iron improved the gear noise, while increasing the rotational speed or the friction increased the acoustic emissions. Regarding the CEL analysis, air was considered a perfect gas, but its viscosity or another state equation could have also been taken into account. Therefore, the above allowed us to state that research into these scientific fields will bring about reliable results.
Highlights
Under working conditions, spur gears are simultaneously subjected to mechanical and thermal loads, both of which are strictly related to noise emissions
The transmitted torque affects the maximum stress on the teeth, rotational speed affects the cyclic loading, and friction leads to increased temperature in the gears and surrounding air
The unification of the laws of thermodynamics and Newtonian mechanics has been pursued by many scientists in the last century
Summary
Spur gears are simultaneously subjected to mechanical and thermal loads, both of which are strictly related to noise emissions. In [1], the interactions between gears and the air is considered, whereby the modeling air is treated as a one-dimensional ideal gas with constant entropy (ds = 0) and an adiabatic flow. The unification of the laws of thermodynamics and Newtonian mechanics has been pursued by many scientists in the last century. The principles are based on using entropy as a bridge between mechanics and thermodynamics [2]. The above approaches and models for the energy and stress–strain states of complex systems under thermodynamic and mechanical loads are considered in [4,5,6].
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