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Abstract
Research on the safety of powerhouse in a hydropower station is mostly concentrated on the vibration of machinery structure and concrete structure within a single unit. However, few studies have been focused on the vibration transmission among units. Due to the integrity of the powerhouse and the interaction, it is necessary to study the vibration transmission mechanism of powerhouse structure among units. In this paper, field structural vibration tests are conducted in an underground powerhouse of a hydropower station on Yalong River. Additionally, the simplified mechanical models are established to explain the transmission mechanism theoretically. Moreover, a complementary finite element (FE) model is built to replicate the testing conditions for comprehensive analysis. The field tests results show that: (1) the transmission of lateral-river vibration is greater than those of longitude-river vibration and vertical vibration; (2) the vibration transmission of the vibrations that is caused by the low frequency tail fluctuation is basically equal to that of the vibrations caused by rotation of hydraulic generator. The transmission mechanism is demonstrated by the simplified mechanical models and is verified by the FE results. This study can provide guidance for further research on the vibration of underground powerhouse structure.
Highlights
Vibration is a common phenomenon in energy infrastructure structures
In order thethe vibration transmission among units, units, a seriesaofseries field structure vibration ordertotoinvestigate investigate vibration transmission among of field structure tests weretests conducted based on an underground powerhouse in a large hydropower station on vibration were conducted based on an underground powerhouse in a large hydropower station
A harmonic body force is applied to unit #1 of the model as vibration source
Summary
Severe vibration can lead to safety problems in rotating machineries and support structures [1,2,3], such as electrical machines, towers of the wind turbine generators, and parabolic reflective surfaces in the concentrated solar power systems. According to the National Energy Administer (NEA), the installed capacity of hydropower has reached 341 million kW in 2017, accounting for 19.2% of the total installed capacity of electricity in China. The annual hydropower generation has reached 1.19 × 1012 kWh, accounting for 18.5% of the total electricity generation in China. Various powerhouse safety problems that are caused by vibration of units happened in hydropower stations correspondingly. Hydropower stations, such as XiaoLangDi, ErTan, and YanTan in China have experienced powerhouse safety problems some extent [4,5]. The most serious safety problem of powerhouse occurred in Russia, the unit #2 of the Sayano-Shushenskaya hydropower
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