Experimental and Analytical Investigation of Short Squeeze-Film Damper (SFD) Under Circular-Centered Orbit (CCO) Motion

Karimulla, Shaik; Dutta, B.K.; Gouthaman, G.

doi:10.1007/s42417-019-00100-9

Cited by 8 publications

(2 citation statements)

References 25 publications

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“…The critical vibration suppression of the flexible rotor has always been a research highlight in the field of rotating machinery such as high-speed motors. In the rotor system supported by mechanical bearings, many scholars use the squeeze film damper with elastic ring [8,9] and dynamic vibration absorber [10] to suppress the critical vibration. Ghasabi [11] applied piezoelectric fibers as sensors and actuators and implemented a nonlinear saturation-based controller with time delays to mitigate the critical vibrations of a continuous spinning shaft.…”

Section: Introductionmentioning

confidence: 99%

Critical Vibration and Control of the Maglev High-Speed Motor Based on μ–Synthesis Control

Yang

et al. 2022

Sensors

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The Maglev motor has the characteristics of high-speed and high-power density, and is widely used in compressors, molecular pumps and other high-speed rotating machinery. With the requirements of miniaturization and high speed of rotating machinery, the rotor of the maglev motor will operate above the bending critical speed, and the critical vibration control of the flexible rotor is facing challenges. In order to solve the problem of the critical vibration suppression of the maglev high-speed motor, the system model of the maglev motor is established, the rotordynamics of the flexible rotor are analyzed and the rotor model is modal truncated to reduce the order. Then, the μ–controller is designed, and the weighting functions are designed to deal with the modal uncertainty. Finally, an experimental platform of the maglev motor with the flexible rotor is built to verify the effect of the μ–control on the suppression of the critical vibration of the maglev rotor.

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Section: Introductionmentioning

confidence: 99%

Critical Vibration and Control of the Maglev High-Speed Motor Based on μ–Synthesis Control

Yang

et al. 2022

Sensors

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“…Holmes (1972) proposed theoretical expressions for the oil film pressure of SFDs without misalignment based the assumptions of open end boundaries and short bearings. Karimulla et al (2019) investigated the oil force of an SFD experimentally and analytically under circular-centered orbit (CCO) motion. Zhang et al (1993) developed a nonlinear theoretical expression for oil force by simplifying the Navier-Stokes equations based on the short bearing assumption.…”

Section: Introductionmentioning

confidence: 99%

Dynamic analysis of an elastic ring squeeze film damper supported rotor using a semi-analytic method

Han

Zhisai

Zhang

et al. 2020

Engineering Applications of Computational Fluid Mechanics

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To speed up the calculation of dynamic analysis for elastic ring squeeze film dampers (ERSFDs) and investigate the dynamic characteristics of ERSFD-rotor systems, a semi-analytic method (SAM) is proposed for analyzing oil film pressure and force. This method is subsequently verified by comparison with numerical simulation and experimental results. Based on this SAM, an improved dynamic model of an ERSFD-supported rotor is developed by coupling the kinetic equations of the rotor with the determination of elastic deformation. Using this method, the oil coefficients and vibration behaviors of the rotor such as the amplitude-frequency relation and the influence of sudden excitation are investigated. The results reveal that the equivalent oil coefficients and damping ratio of the system can be increased significantly by the adoption of ERSFDs. Therefore, the nonlinear bistable response occasionally occurring in traditional squeeze film damper (SFD) supported rotors is effectively suppressed and the transient vibration process caused by sudden unbalanced excitation action is significantly shortened. The SAM enables one to reduce the computation time of the previous method by more than 90%. Such a reduction greatly improves the computational efficiency.

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Flow-induced vibration of a flexible tube with squeeze film in an otherwise rigid tube array subjected to cross-flow

Lai,

Yang

2024

Nonlinear Dyn

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Experimental and Analytical Investigation of Short Squeeze-Film Damper (SFD) Under Circular-Centered Orbit (CCO) Motion

Cited by 8 publications

References 25 publications

Critical Vibration and Control of the Maglev High-Speed Motor Based on μ–Synthesis Control

Critical Vibration and Control of the Maglev High-Speed Motor Based on μ–Synthesis Control

Dynamic analysis of an elastic ring squeeze film damper supported rotor using a semi-analytic method

Flow-induced vibration of a flexible tube with squeeze film in an otherwise rigid tube array subjected to cross-flow

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