2018
DOI: 10.3390/w10040353
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Discussion on Stochastic Analysis of Hydraulic Vibration in Pressurized Water Diversion and Hydropower Systems

Abstract: Hydraulic vibration exists in various water conveyance projects and has resulted in different operating problems, but its obvious effects on system's pressure head and stable operation have not been definitively addressed in the issued codes for engineering design, especially considering the uncertainties of hydraulic vibration. After detailed analysis of the randomness in hydraulic vibration and the commonly used stochastic approaches, in the basic equations for hydraulic vibration analysis, the random parame… Show more

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Cited by 10 publications
(8 citation statements)
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“…However, sometimes the frequencies of external disturbances are similar or equal to the natural frequencies of the pressurized pipeline system, hydraulic resonance and a self-excited vibration could happen because of the system's inherent instabilities. 6 With the rapid development of hydropower stations with longer pipelines, larger unit capacity, lower runner rotational speed, and more frequent switching of operating conditions, the forced vibration even the severe hydraulic resonance could be easily generated and finally influence the structure safety and operation stability of hydropower systems. [7][8][9] Numerous existing research have been carried out on the pressure fluctuations in hydropower systems, including experimental tests and numerical simulations.…”
Section: Introductionmentioning
confidence: 99%
“…However, sometimes the frequencies of external disturbances are similar or equal to the natural frequencies of the pressurized pipeline system, hydraulic resonance and a self-excited vibration could happen because of the system's inherent instabilities. 6 With the rapid development of hydropower stations with longer pipelines, larger unit capacity, lower runner rotational speed, and more frequent switching of operating conditions, the forced vibration even the severe hydraulic resonance could be easily generated and finally influence the structure safety and operation stability of hydropower systems. [7][8][9] Numerous existing research have been carried out on the pressure fluctuations in hydropower systems, including experimental tests and numerical simulations.…”
Section: Introductionmentioning
confidence: 99%
“…Hydraulic vibration is a periodic hydraulic transient that exists in various water conveyance systems and may result in instabilities and local destructions [29,30]. With complex condition switches under frequency regulation tasks, both the initial and boundary conditions become extremely complicated, especially for off-design conditions.…”
Section: Introductionmentioning
confidence: 99%
“…First, frequent changes in unit working conditions can lead to highly complex fluid flow in the pressure diversion pipeline, resulting in unstable unit operation and abnormal shutdown Zhang et al (2017aZhang et al ( , 2017b. Second, pressure fluctuations in the draft tube, the water hammer phenomenon in the passing water system, and unit vibration caused by misalignment of the generator's rotor axis also affect stable unit operation (An et al, 2017;Fu et al, 2019;Zhou and Chen, 2018). Third, as hydropower stations continue to be used over time, the age of equipment is climbing and thus poses notable challenges to stable station operations.…”
Section: Introductionmentioning
confidence: 99%