Effect of Boundary Conditions on Fluid–Structure Coupled Modal Analysis of Runners
| Autor: | Xiang Xia, Zhengwei Wang, Dianhai Liu, Jing Yang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Modal analysis
Naval architecture. Shipbuilding. Marine engineering Boundary (topology) VM1-989 Ocean Engineering 02 engineering and technology GC1-1581 Oceanography 01 natural sciences Turbine 010305 fluids & plasmas 0203 mechanical engineering hydraulic machinery runner 0103 physical sciences Boundary value problem Hydraulic machinery Water Science and Technology Civil and Structural Engineering Physics Coupling Mode (statistics) wet modal analysis acoustic–structure coupling Mechanics boundary condition 020303 mechanical engineering & transports Modal |
| Zdroj: | Journal of Marine Science and Engineering, Vol 9, Iss 434, p 434 (2021) Journal of Marine Science and Engineering Volume 9 Issue 4 |
| ISSN: | 2077-1312 |
| Popis: | To predict the resonance characteristics of hydraulic machinery, it is necessary to accurately calculate the natural modes of the runners in the operating environment. However, in the existing research, the boundary conditions of the numerical modal analysis of the runner were not unified. In this paper, numerical modal analysis of a prototype Francis pump turbine runner was carried out using the acoustic–structure coupling method. The results of three different constraints were compared. The influence of the energy loss on the chamber wall on the natural modes of the runner was studied by the absorption boundary. The results show that the constraint condition (especially the rotating shaft) has significant impacts on the torsional mode, the radial mode, the 1 nodal-diameter mode, and the 0 nodal-circle mode, and the maximum differences in the natural frequencies under different conditions are 69.3%, 56.4%, 35.1%, and 9.4%, respectively. The change of the natural frequencies is closely related to the modal shapes. On the other hand, the energy loss on the wall mainly affects the nodal-circle modes, and the influence on other modes is negligible. The results can provide references for the design and resonance characteristics analysis of hydraulic machinery runners. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|