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1 Journal of Theoretical and Applied Mechanics

1 2025

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Dynamics response analysis and mechanical experimental investigation of a double-span multi-support shaft system in micro gas turbines

Lin Hao, Song Leiming, Geng Haipeng, Feng Sheng, Li Ling

Journal of Theoretical and Applied Mechanics

2025

Vol. 63 nr 1

115--129

This study delves into analysis of dynamics and experimentation concerning a double-span multi-support shaft system in micro gas turbines. Critical speed analysis was conducted, accompanied by numerical solutions providing insights into the natural frequency. Additionally, an unbalanced response and vibration amplitude of the shaft were calculated, serving as crucial inputs for dynamic balancing considerations. The study also examined the influence of stiffness coefficient variations in bearings on the unbalance response. Dynamic balancing experiments of the motor rotor and the compressor-turbine rotor were conducted separately. Then a vibration experiment for the double-span multi-support shaft was executed at an experimental speed of 60000 r/min. The research revealed that rotors could be regarded as rigid bodies throughout the operational speed range. This study holds significant engineering implications and a practical application value.