Time synchronization method of various kinds of measuring instruments in dam-break experiment

Abstract

The present invention discloses a time synchronization method of various kinds of measuring instruments in a dam-break experiment. According to the method of the invention, a high-speed camera, a wave-height meter and a flow meter are connected onto the same computer, so that the three instruments can be simultaneously started; when the dam-break experiment is implemented in a water tank, the high-speed camera records flow conformation, and the wave-height meter and the flow meter record the change of the water level of a downstream measuring point of a gate with the time and the change of the flow rate of the downstream measuring point of the gate with the time respectively. Time when dam-break water flow arrives at the measuring point is determined through a high-speed video, and a moment when corresponding water level and flow rate begin to rise is found out, and therefore, the time difference of the different instruments can be obtained; and the synchronization of the time is realized in follow-up data processing, and therefore, the time accuracy of the dam-break experiment can be improved. The time synchronization method of the invention has a wide application range and can be used in a dam-break physical model experiment and can be also used to realize time synchronization between devices in water engineering or coastal engineering physical model experiments. The time synchronization method of the invention has the advantages of simple operation, high repeatability and high transferability; and time synchronization error between the measuring instruments is smaller than 0.05 seconds.

Description

technical field [0001] The invention relates to a time synchronization method for multiple measuring instruments, in particular to a time synchronization method for multiple measuring instruments in a dam break experiment. Background technique [0002] Dam failure usually refers to a catastrophic event in which the cofferdam of a reservoir suddenly collapses caused by natural disasters or human factors, and then a burst flood is formed downstream of the reservoir, causing huge losses in human life, ecological environment and production economy. However, the research on dam breaks is not limited to inland areas, and it also has very important research significance in coastal engineering. For example, the propagation process of tsunamis and tidal surges to the shore is consistent with the dynamics of dam break water flow in terms of physical mechanism of. Therefore, the exploration of dam failure has significant scientific research significance and engineering application val...

AI Technical Summary

Problems solved by technology

At present, in the case of multiple measuring instruments working at the same time, the following problems and difficulties exist in the dam break experiment: (1) The sampling frequency of the measuring instruments is too low to capture the instantaneous change of the water level or flow velocity of the dam break wave; (2) Different instruments There are respective time delays. Even if multiple instruments can be started at the same time through the computer, due to the time difference, the time when each instrument actually starts to work is different, that is, the zero point of the respective data time is not consistent; (3) Dam break time The zero point, that is, the time when the gate starts to move upwards is difficult to determine, and a high-speed camera is needed to record the process of opening the gate

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