it is even specified to be as low as 0.5%. It is mentioned that,
at very low rotational speeds, a clear resonance frequency point is prevalent. Although the resonance area is mostly below the operating speed range of the turbine, it could cause serious
damage to the system if it becomes too severe as the rotor speed goes through resonance during start-up. Furthermore, under certain conditions, there are frequency components that can excite the natural frequencies of the whole turbine and tower structure, which could cause serious resonance in the physical structure and increase the fatigue loading of the system.
it is even specified to be as low as 0.5%. It is mentioned that,at very low rotational speeds, a clear resonance frequency point is prevalent. Although the resonance area is mostly below the operating speed range of the turbine, it could cause seriousdamage to the system if it becomes too severe as the rotor speed goes through resonance during start-up. Furthermore, under certain conditions, there are frequency components that can excite the natural frequencies of the whole turbine and tower structure, which could cause serious resonance in the physical structure and increase the fatigue loading of the system.
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