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Gas loss flow measurement method and system based on sample variance elimination error
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A sample variance and flow measurement technology, applied in the direction of measuring flow/mass flow, liquid/fluid solid measurement, measuring devices, etc., can solve problems such as errors and affecting the measurement accuracy of gas meters, and achieve high accuracy.
Active Publication Date: 2021-11-16
CHENGDU QIANJIA TECH CO LTD
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[0004] However, the estimation of ΔT will be affected by the gas flow rate. ΔT fluctuates with the fluctuation of gas flow rate, and then there will be a large error when the gas meter measures the total loss flow of gas, which will affect the measurement accuracy of the gas meter.
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Embodiment 1
[0053] like figure 1 As shown, this embodiment provides a gas loss flow measurement method based on sample variance elimination error, which is applied to an ultrasonic gas meter, including the following steps:
[0054] S1. Obtain the frequency spectrum of the cross-correlation curve according to the collected up-flying signal and down-flying signal;
[0055] S2. According to the frequency spectrum of the cross-correlation curve, the instantaneous flow rate of the gas is obtained based on the instantaneous flow rate model of the gas, and the instantaneous flow rate is sampled every t seconds;
[0056] S3. Input the sampling instantaneous flow velocity into the sample variance elimination error model to perform error elimination and replacement to obtain the corrected flow velocity;
[0057] S4. Calculate the gas loss flow rate based on all corrected flow rates.
[0058] S1 specifically includes the following steps:
[0059] The above-mentioned up-flying signal and the down-...
Embodiment 2
[0079] Based on the gas loss flow measurement method based on sample variance elimination error in Example 1, this embodiment provides a gas loss flow measurement system based on sample variance elimination error, including: a spectrum acquisition module, an instantaneous flow calculation module, a sampling module, and an error proposal module and loss flow calculation module;
[0080] The frequency spectrum obtaining module obtains the frequency spectrum of the cross-correlation curve according to the collected up-flying signal and the down-flying signal;
[0081] The instantaneous flow calculation module obtains the instantaneous flow rate of the gas based on the gas instantaneous flow model based on the frequency spectrum of the cross-correlation curve, and the sampling module samples the instantaneous flow rate every t seconds to obtain the sampled instantaneous flow rate;
[0082] The error proposal module inputs the sampling instantaneous flow velocity into the sample va...
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Abstract
The gas loss flow measurement method and system based on the sample variance elimination error disclosed in the present invention are applied to ultrasonic gas meters, and the spectrum of the cross-correlation curve is obtained according to the collected up-flying signal and down-flying signal; The instantaneous flow rate model obtains the instantaneous flow rate of gas, and samples the instantaneous flow rate every t seconds; input the sampled instantaneous flow rate into the sample variance elimination error model for error elimination and replacement to obtain the corrected flow rate; calculate the gas loss flow rate based on all corrected flow rates, and pass The sample variance elimination error model judges whether the deviation of the instantaneous flow velocity is a normal accidental error or is caused by the adjustment of the gas flow, and then performs different corrections for the two situations to eliminate the error value and replace it with a stable amount The amount of error can avoid data loss, and the accuracy of the metered gas loss flow is high.
Description
technical field [0001] The invention relates to the technical field of ultrasonic gas metering, in particular to a gas loss flow measurement method and system based on sample variance elimination errors. Background technique [0002] With the increasingly higher requirements for gas metering accuracy in the field of gas metering, ultrasonic gas meters are emerging. Compared with membrane gas meters, ultrasonic gas meters have the advantages of wide range, small size, simple structure, high measurement accuracy, and good stability. Ultrasonic gas meters are characterized by non-contact measurement, no moving parts, no pressure loss, and extremely high It has become a research hotspot in the field of gas metering due to its advantages such as high measurement accuracy. [0003] The measurement principle of the ultrasonic gas meter is to estimate the instantaneous flow rate by using the difference in the elapsed time of ultrasonic waves in the direction of gas flow and reverse...
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