Communication Dans Un Congrès Année : 2016

Effects of Residual Imbalance on the Rotordynamic Performance of Variable-Speed Turbo Blower

Résumé

In the variable-speed turbo machinery, it is important to ensure the reliability in operation speed of the large area unlike the constant speed rotating machine. In particular, as a study on the performance maintenance and minimal vibration, the high-speed balancing and field balancing are necessary to remove vibrations due to the unbalanced mass. In using a dedicated balancing device, to add or remove the weight is often not obtained satisfactory results for expanded the range of variable rotating speed. Thus, in order to improve the performance and driving stability of variable speed machine, it has to make the residual imbalance to a minimum, through the field balancing. This study presents the experimental results to apply the two-plane multi-speed balancing techniques, and ensure the driving stability by reducing the residual imbalance. This paper also shows rotordynamic simulation results of the rigid rotor and bearing system, including damped critical speed and imbalance responses. The operating maximum speed of the turbo blower is up to 20,000 rpm, usually it works normally in the 4,000 ~ 17,000 rpm as the variable-speed region. And this study was tried to reduce the residual imbalance vibration in all operating speed regions. First, by utilizing an influence coefficient method the rotor was adjusted to the ISO 1940 standard grade G1. Additional, as the least square method, the experiment was carried out to minimize the residual imbalance by applying the multi-speed balancing in the field. The first rigid mode was predicted in the near 17,500 rpm, the experimental results showed that rigid mode is consistent. Accordingly, the field balancing was performed at several points of the rigid mode speed region. This study was an effort to reduce excessive vibration due to the rigid mode by minimizing the residual imbalance. As a result, the vibration caused by the residual unbalance can be reduced to 70%, and experimentally verified that this can effectively improve the rotordynamic performance.

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hal-01890082 , version 1 (08-10-2018)

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  • HAL Id : hal-01890082 , version 1

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Sena Jeong, Eojin Kim, Kyungho Jeong, Doyoung Jeon, Yong Bok Lee. Effects of Residual Imbalance on the Rotordynamic Performance of Variable-Speed Turbo Blower. 16th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, Apr 2016, Honolulu, United States. ⟨hal-01890082⟩

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