Calculation method and system for measuring noise influence

Abstract

The invention discloses a calculation method and system for measuring noise influence, and the method comprises the following steps: building a time domain finite difference model of dynamic hydraulic simulation of a to-be-detected pipeline; measuring the state quantity of the to-be-detected pipeline without considering the influence of measurement noise, and obtaining a noisy actual measurement sequence of the state quantity of the to-be-detected pipeline; calculating an estimation sequence of the state quantity of the to-be-detected pipeline according to the time domain finite difference model and the noisy actual measurement sequence; and assuming that the measurement noise is in normal distribution, calculating the measurement noise error of the estimation sequence by adopting an industrial valuation method. The invention provides an estimation method for analyzing the influence of the measured noise on the final calculation result when the natural gas operation state is calculated by using a difference scheme, the noise size of the final calculation result can be directly obtained according to the measured noise size, and a proper boundary condition is selected for simulation calculation. And a theoretical basis is provided for processing (such as filtering) of a final calculation result.

Description

technical field [0001] The invention belongs to the field of pipeline leak detection methods, and particularly relates to a calculation method and system for measuring the influence of noise. Background technique [0002] Considering the physical properties of natural gas, pipeline transportation has become the main way of natural gas transportation at home and abroad. The pipeline has large transportation volume, high transportation efficiency, strong continuity and high safety factor, and plays an increasingly important role in the national economy. Although pipeline transportation is safer than other transportation methods, due to aging and corrosion of pipeline equipment, construction defects, landslides, earthquakes, man-made damage and external disturbances, leakage accidents occur from time to time. Environmental pollution exceeds the costs involved in downtime and maintenance costs, and even causes explosions, fires, and casualties. The harm should not be underestim...

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Problems solved by technology

[0003] In the prior art, the method of modeling is adopted. Firstly, the model is established, and then the estimation sequence of the terminal mass flow rate and terminal pressure is analyzed and calculated through the model, and the estimated sequence is compared with the measured sequence to determine whether there is leakage in the pipeline. However, when the pipeline parameters and fluid parameters are not subjected to any filtering and noise reduction operations, there is a measurement noise error, so it is urgent to provide a calculation method for the measurement noise influence

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