| Abstrakt: |
Purpose: The design, manufacturing, and operation of high-speed rotor-bearing systems must be accompanied by dynamic analysis and thorough studies of their dynamic behaviors. Bearings are one of the most important components of rotor-bearing systems, and their dynamic characteristics can significantly affect the dynamic behavior of the whole rotating system. Therefore, optimization of dynamic characteristics of bearings may be used as an appropriate tool to achieve the desired dynamic behavior. Methods: The present study considers a hypothetical small high-speed automotive turbocharger, which is modeled as an axisymmetric rotor-bearing system employing the finite-element method. We optimize the dynamic characteristics of the bearings, including stiffness and damping coefficient, using the NSGA-III multiobjective optimization method to minimize the bearing reaction forces and the amplitude of vibrations caused by rotating unbalance. Results: A comprehensive dynamic analysis is performed, and valuable information and graphs, including the Campbell diagram, critical speeds, mode shapes, and the unbalance response at steady and transient operating conditions, are obtained and discussed. Conclusion: The results demonstrate that using optimized bearings can significantly improve the dynamic behavior of the rotor-bearing system, both at steady and transient operating conditions, leading to higher performance and a longer lifetime of the rotor-bearing system. [ABSTRACT FROM AUTHOR] |
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