Study On Dynamic Characteristics Of Flap Valve During Suspending Period And Design Of Computer-aided Analysis System

In the study on pumping station, pump stopping caused by normal reason or motive force will make water counter-current and result in pump reversing. When being serious, pump will be destroyed that could influence system running. Therefore, the study on dam locking becomes an important subject. And pumping station was considered as the important component of hydraulic-engineering, its status is being known and paid more attention. Flap valve used in pumping station is a kind of hydraulic-operated automatic gate, which is similar to a hinged cheek. Because of their simple structure and reliability, being able to shorten the length of outlet passage and facilitate the starting of pumping system in comparison with siphonic vaeuum-distroied cutoff scheme. So it is favorable to save investment for building and transforming the pump station project, meanwhile, it has obvious advantages in operating and using.In this paper, flap valve's open angle was analysed on the basis of summarizing forefathers' study on mathematical analysis of the eharacthedstics and criterion equation. By the way of dynamic systems, sport law in pump stopping was analysed. Influence between variables in the course of flap valve failing was quantitatively studied. Energy law was used to anslyse pump stopping and compute buffer device. At the same time, visual systematic procedure for the open angle and pump stopping dynamic process in flap valve was developed on the platform of microsoft Visual Basic 6.0. This text has explained in details on programming method that the system adopts, the system forming and the development course and principle of the module. Complemented. with vivid multimedia information through the good human-computer dialogue mechanism, the system instructs users how to fiuish system operation with the vivid picture and text materials. Various softwares are integrated as well by the 'Automation' technic provided by VB that shortened the distance among the system and user.This paper finally combined spot experiments and calculate example to verify exactness of the module and formula as well as procedure. Circulate results showed that the theories fit with measured data very well and the procedure has many advantages such as circulating quickly, good readability and easy to maintenance. By this way, the course of pump stopping and falling is clearer and quantitative analysis is more accurate.