Modularized implementation method for acquiring characteristic frequency of complex water delivery system

Abstract

The invention provides a modular implementation method for acquiring characteristic frequency of a complex water delivery system, which comprises the following steps: S1, decomposing the complex water delivery system into independent simple elements including an elastic pipeline element, a rigid pipeline element, an impedance element, a surge chamber element, a reservoir element, an oscillation valve element and a water turbine element; s2, numbering the simple elements and the nodes adjacent to the simple elements in sequence; s3, compiling the decomposed simple elements of the complex water delivery system into sub-matrix expressions in sequence; s4, constructing a total matrix of the water delivery system; s5, excitation input nodes and response output nodes are determined; and S6, solving the total matrix of the water delivery system, and determining the frequency response characteristics of the system. According to the method, the structural matrix method is used as a basic principle, each hydraulic element is subjected to block modeling, the matrix form of the constructed elements does not change along with the change of the arrangement of the water delivery system, and the modularization degree is high.

Description

technical field [0001] The invention relates to a numerical simulation calculation method for the characteristic frequency of the waterway system used for the hydraulic resonance analysis of the water delivery power generation system, in particular to a modular realization method for obtaining the characteristic frequency of the complex water delivery system, which is suitable for complex water delivery systems Water Resources and Hydropower Engineering. Background technique [0002] The hazards of hydraulic resonance in the water delivery system are very prominent. Not only may the vibration of the unit itself be amplified, causing large-scale periodic pressure fluctuations in the water channel, but it may also cause fatigue damage to the structural parts of the unit and reduce the use of the unit. life, aggravating the suddenness and severity of accidents. The hydraulic resonance in the waterway system can be divided into self-excited oscillation and forced oscillation. S...

AI Technical Summary

Problems solved by technology

[0003] When calculating the characteristic frequency of the waterway system, the traditional hydraulic impedance method needs to connect the hydraulic elements step by step into a whole and iteratively solve the problem. This method is suitable for the series waterway system. For the parallel waterway system, the modeling and solution are relatively cumbersome

At the same time, the transfer matrix method is not very regular in the processing of bifurcation elements, and needs to be customized for different boundary conditions

It can be seen that these traditional frequency solution methods have different degrees of shortcomings when dealing with complex water delivery systems, and cannot achieve modular solutions

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