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Study on the Vibration Characteristics of Supporting Structure for Hydropower Plant

Author: DongChunLiang
Tutor: PengXuanMao
School: Hohai University
Course: Structural Engineering
Keywords: Hydropower plant Supporting structure Vibration characteristics Fluctuating pressure Vibration source
CLC: TV312
Type: Master's thesis
Year: 2006
Downloads: 143
Quote: 5
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Abstract


With the continuous development of the utilities industry, power plant unit capacity of the plant size is increasing concern the Hydropower Plant structural vibration problems which may lead to very, worth studying structural vibration caused by the fluctuating pressure within the plant runner. In this paper, the Hei River Hydropower Project, the modal characteristics of the supporting structure of the hydropower plant unit, the unit hydraulic vibration vibration source, runner fluctuating pressure characteristics, dynamic response unit supporting structure under various dynamic loads more comprehensive analysis. Fluctuating pressure considerations highly innovative. Focus calculated using the finite element method analysis of the dynamic characteristics of the hydropower plant support structure in a variety of different circumstances; Through comparative analysis, in-depth study of the impact of various factors on the dynamic characteristics of the plant support structure; hydropower plant support structure vibration source analysis, according to the analysis results Resonance Vibration and Resonance Vibration, made several suggestions; combined with the Hydropower Plant runner pulsating pressure characteristics, with reference to the study of the distribution pattern of the existing turbine flow passage pressure pulsation outcomes, distribution of the pulsating pressure within the plant support structure throughout runner made reasonable assumptions, spectral analysis and pulse pressure-time curve, the dominant frequency of the pulsating pressure both on the plant support structure; analysis and calculations to determine the vibration have an important impact on the typical dynamic load, calculated using different methods hydropower plant support structure in the value of the dynamic response of two typical dynamic loads. Since the natural frequency of the hydropower plant support structure and overall plant natural frequency compared to the high side, but the the corresponding vibration characteristics remain consistent; hydropower plant support structure from the vibration characteristics of several main factors, the floor of the boundary conditions and additional quality; exciting force caused by the hydropower plant support structure may be related to the the volute uneven flow field, water hammer of the the penstock - turbine waterways system resonance excitation force caused by the magnetic pull of the exciting force and uneven; spectrum The analysis shows that the fluctuating pressure is mainly reflected in the the hydropower plant supporting structure within the flow channel for low frequency hydraulic exciting force the pulse excitation force volute may occur with the plant support structure resonance.

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CLC: > Industrial Technology > Hydraulic Engineering > Hydraulic structures > Structural theory and computational > Structural Dynamics
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