Application of automatic flow measurement mathematical model for farmland irrigated area open channel

Abstract

Application of an automatic flow measurement mathematical model for a farmland irrigated area open channel. The application refers to application of realizing automatic flow measurement for the farmland irrigated area open channel based on the automatic flow measurement mathematical model for the farmland irrigated area open channel; the mathematical model is composed of a flow measurement device and a control system; and according to the application, a flow measurement device model for the irrigated area open channel is fixed above a measured channel, a swing rod is placed into the open channel, water flow impacts the swing rod to enable the swing rod to deflect by a certain angle, the deflection angle of the swing rod is acquired through an impulse signal of an photoelectric encoder, and the deflection angle of the swing rod is compared with a previously established mathematical model so as to obtain channel flow of the farmland irrigated area open channel. According to the application, the mathematical model is established, and the waterflow is utilized to impact the swing rod to enable the swing rod to deflect by a certain angle so as to detect the flow of the farmland irrigated area open channel; through singlechip technical processing, automatic flow measurement for the farmland irrigated area open channel is realized and the flow measurement precision is improved; furthermore, the price is low, and the application is convenient for popularization and application of an irrigated area.

Description

technical field [0001] The invention relates to an automatic flow measurement device and method for open channels in irrigation areas. Specifically, a pendulum rod of an automatic flow measurement mathematical model is placed in the open channel, and the water flow hits the pendulum to make it deflect at a certain angle, and passes through a photoelectric encoder. The pulse signal collects the deflection angle of the pendulum, and compares this angle with the previously established mathematical model to obtain the flow rate of the open channel in the farmland irrigation area. Background technique [0002] Flow detection plays an important role in the field of farmland water conservancy and hydrological testing, and it is an important part of testing technology. To realize the real-time detection of open channel flow, the key lies in whether the flow detection system can detect the flow value in time and accurately. With the continuous development of science and technology, ...

AI Technical Summary

Problems solved by technology

Calculation expression of triangular weir flow measurement: Q=Ch 5 / 2 , where C indicates that the relevant channel coefficient can be obtained by looking up the table, h is the water head on the weir, the operation of this flow measurement is simple, the unknown parameter is only h, and it is easy to find the channel flow, but when the water level is relatively high, the water surface fluctuates greatly, and the influence on the water level The height measurement accuracy cannot reach the corresponding height, so there is an error in the flow calculation

However, due to its high price, complicated installation and commissioning and stricter requirements than other flowmeters, it cannot be used more widely.

[0006] The above-mentioned existing devices and methods capable of detecting channel flow are still constrained by the measurement environment and the user's economic conditions, which limits the scope of application. Based on this, a simple structure, flow measurement An automatic flow measurement device and method for farmland irrigation open channels that are fast, convenient, low in cost, wide in application and not affected by the flow measurement environment are very necessary

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