Tengely igénybevételének vizsgálata és validálása végeselemes módszerrel CFD alapú terhelés esetén = Strength analysis and validation of an overhung shaft using analytical and finite element methods

Polgár, Máté and Németh, Gábor and Csóka, Levente (2026) Tengely igénybevételének vizsgálata és validálása végeselemes módszerrel CFD alapú terhelés esetén = Strength analysis and validation of an overhung shaft using analytical and finite element methods. GÉP, 77 (1). pp. 39-46. ISSN 0016-8572

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Abstract

This paper presents the strength analysis of an overhung shaft using analytical and finite element methods under combined bending and torsional loading conditions. The loading conditions were determined based on CFD simulations and operating data obtained from the electric motor. Analytical calculations were used to determine the nominal stresses, while the finite element model enabled the investigation of local stress concentrations caused by geometric discontinuities. The results showed that the shaft behavior is primarily dominated by bending, whereas torsional loading acts as a secondary effect. The validation of the numerical model was performed using measured operating torque values. At lower rotational speeds (1470 1/min), the CFD model underestimated the actual shaft loading due to the absence of mechanical losses, resulting in a relative deviation of approximately 58%. In contrast, at higher rotational speeds (2200 1/min), the relative deviation remained below 5.8%, showing good agreement between the measured and simulated reduced torque values. The results indicate that the shaft design can be considered safe under the investigated operating conditions, and the presented methodology is suitable for the analysis and validation of similar drive systems.

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