Experience of an assessment of the vertical Francis hydroturbines vibration state at heads from 40 to 300 m

28th IAHR symposium on Hydraulic Machinery and Systems

Dolmatov, E.^1 ; Zaharov, A.^1 ; Ilin, S.^1 ; Kuznetsov, I.^1 ; Nikiforov, A.^1

OJSC Power Machines, 3A, Vatutina str., St.-Petersburg

195009, Russia^1

关键词: Fundamental principles;    High-low frequency;    International standards;    Low frequency regions;    Operational reliability;    Turbine vibrations;    Vibration displacements;    Vibration parameters;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/49/7/072009/pdf
DOI  :  10.1088/1755-1315/49/7/072009

来源: IOP

【 摘 要 】

The article covers a choice of main vibration parameter at an assessment of a vibration state of vertical Francis hydroturbines. At present time vibration velocity and vibration displacement are adopted as main parameters of non-rotating parts vibration in the international standard ISO 10816-5:2000 "Mechanical vibration - Evaluation of machine vibration by measurements on non-rotating parts - Part 5: Machine sets in hydraulic power generating and pumping plants" (further ISO 10816-5:2000). The hydraulic turbines refer to the slow-speed machines with rotation speed from 60 to 600 rpm (∼ 1 - 10 Hz). So maximum vibration displacements and dynamic stresses in hydraulic turbines supporting parts are in low-frequency region of vibration spectrum. In this report comparative data of hydro units supporting parts vibration velocity and vibration displacement measurements are presented. Using these data assessment of hydro units vibration state has been done. It is shown that the assessment of a hydro unit vibration state using parameter "vibration displacement" corresponds to the fundamental principles of operational reliability and fatigue strength of hydro units supporting parts. It is noted that when hydro units operate at small and partial loads with high low-frequency unsteady flow (f