Study on modal characteristics of the main shaft system of the booster pump in the fire station

To evaluate the dynamic performance and operational safety of the main shaft system of the booster pump in fire station, modal characteristics under different conditions were studied. Adaptive tetrahedral meshing was adopted for mesh generation, and mesh convergence verification was conducted to ensure analysis accuracy. Free modal analysis was carried out, and the results showed that the vibration modes exhibit the characteristic of transitioning from low-order overall coordinated vibration to high-order local vibration. Pre-stressed modal analysis was also performed, and the results indicated that the spiral impeller is a high stress concentration area, while the stress distribution of the main shaft body is gentle. Harmonic response analysis was conducted for the primary guide vanes and secondary guide vanes. Combined with the rated operating parameters, it can be seen that the resonance peak ranges of the two guide vanes both avoid the excitation frequency, with no significant resonance amplification phenomenon observed. The research shows that the dynamic characteristics of this main shaft system meet the actual working requirements, and can provide a reference for the structural optimization and reliable operation of booster pumps in fire stations.