Vibration Analysis of Pressure Pipelines in the Model with Added Water Mass
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Abstract:
For the safety problems of vibration in the pressure pipeline of high-lift pumping station, the approach of added water mass was proposed. A numerical model of pressure pipeline of pumping station was developed based on the fluid-solid interaction, and the modal parameters under different working conditions were identified based on the No.1 pressure pipeline of #2 pumping station in the first stage of Jingtai irrigated area. The displacement deformation of pressure pipeline and its vibration characteristics were analyzed. The results showed that (1) the vibration deformation stimulated by the pressure pipeline occurs at the inlet and outlet pipes of #4 machine; (2) the vibration amplitude of high-order vibration mode is larger than that of low-order vibration mode, and with the increasing of order, vibration deformation can also occur in the outlet pipe which is not easily to be vibrated; and (3) the inlet pipe of #8 machine does not affect the overall pipeline vibration. The results of finite element numerical simulation analysis were similar to those obtained from in-situ measurements. Consequently, the model with added water mass is simple and provides reliable results, and it has advantages in the fluid-solid coupling simulation of pressure pipelines.
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