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Nair, Pranoy Sureshbabu
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Gear System Parameters and Its Influence on Gearbox Noise

General Motors Technical Centre India-Yogesh Kumar Dewangan, Pranoy Sureshbabu Nair, Dipin Nair
Published 2019-06-05 by SAE International in United States
Tonal noise due to gears is one of the fundamental noise problems in a gearbox. Gear tooth deflections generate dynamic forces that lead to unwanted load fluctuations, thus noise. Different factors that are considered to control this noise, some to mention like proper gear macro design, microgeometry corrections, and housing compliance. However, identifying the appropriate variable as a measure of contribution to the overall response helps in getting more accurate remedial solutions. Some outputs to track are different harmonic components of TE, temperature effects, components of forces, rim compliance and friction.For evaluation, usually, the amplitudes of individual harmonics of transmission error are related to the respective orders of the noise levels assuming it as one of the primary excitation parameters of gear noise. In this paper, a brief overview of TE and its harmonic distribution is discussed with the example of an ideal gear mesh model and then quantifying TE with the introduction of mesh misalignment. The effect of providing additional microgeometry corrections to compensate for the misalignment is also discussed.The study in this paper…
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Effectiveness of Power-Law Profile Indentations on Structure-Borne Noise

General Motors-Jeffrey Curtis
General Motors Technical Center India-Pranoy Sureshbabu Nair, Nilankan Karmakar, Seshagiri Rao Maddipati
Published 2019-06-05 by SAE International in United States
A study on the effect of indenting power-law shaped profiles on the flexible structures for investigating the vibration damping characteristics using computational simulation method is discussed. The simulation results are checked to see the impact of such features on the damping behavior of flexible structures responsible for radiating noise when excited with fluctuating loads. Though the conventional remedies for solving Noise and vibration issues generally involves tuning of structure stiffness or damping treatment this paper gives an insight on the idea of manipulation of elastic waves within the flexible structure itself to minimize the cross-reflections of the mechanical waves. The simulation studies mentioned in this paper not only hovers over the effectiveness of such features but also will be helpful for the engineers to look through a different perspective while solving N&V issues using simulation tools. In this paper, different studies are discussed to see the impact of such features on the damping effect of the vibrating structure comparing mobility response and far-field sound pressure response as well. Propagation of waves within the structure is…
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Simulation Methodology to Study the Effect of Fluid-Structure Interaction on Dynamic Behavior of Flexible Pipes

General Motors Technical Center-Pranoy Sureshbabu Nair, Nilankan Karmakar
Published 2019-04-02 by SAE International in United States
A numerical simulation methodology that enables assessment for the impact of fluid flow on the slender piping system’s dynamics has been discussed in this paper. The fluid-structure interaction involves many different complex phenomena like water hammer, cavitation which can also affect the dynamics of the overall system but this paper highlights on the influence of fluid flow velocities and piping designs on dynamic responses of the system. A co-simulation between structure and fluid dynamics is performed in Abaqus to evaluate the dynamic behavior of the piping system. The flexible pipes are excited with dynamic loads capturing the modal behavior of the system and displacements are considered as a measure for relative comparison. The free vibration response, after the removal of load, is also used to evaluate the damping characteristics of the overall system subjected to different fluid flow conditions. The main objective of this method is to provide an opportunity for the analysts to come up with alternate ways to capture the variation in responses in time domain simulations and to account for such changes…
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