Method for calibrating drop hammer volume

Abstract

The invention discloses a method for calibrating a drop hammer volume. According to corresponding pure water standard densities in a test room ambient temperature of 15-35 DEG C given by an international temperature standard pure water density table in 1990, there is a different pure water density per 0.1 DEG C. Therefore, pure water is adopted for calibration of the drop hammer volume, the density of the pure water can be known by table lookup only by determining the temperature of the pure water, so that the standard volume of the drop hammer under the temperature is obtained according to the Archimedes principle F float = G discharge = rho liquid gV discharge. The calibration method stabilizes the pure water temperature at a fixed value, and errors caused by the temperature inaccuracy of the drop hammer volume calibration are avoided, making the volume calibration more accurate and reliable.

Description

technical field [0001] The invention relates to a method for calibrating the volume of a pendant, in particular to a high-precision calibration method for the volume of a pendant used for density measurement of fuel oil, gasoline or other liquids. Background technique [0002] The improvement of the accuracy and reliability of the fuel oil measurement system has an important impact on the overall performance of the aircraft. For fighter jets, improving the accuracy of fuel measurement can greatly increase their payload, range and combat radius; while for civilian aircraft, it can greatly improve their economics. The measurement accuracy of the existing fuel oil quantity measurement system can only reach about 4% of the full scale in the air. Generally, the full fuel capacity of a large transport aircraft is usually tens of tons. Even if it is calculated with an accuracy of 1%, the error is several hundred kilograms. In order to achieve high-precision measurement of aircraft...

AI Technical Summary

Problems solved by technology

In order to ensure that the density sensor can detect the accuracy of fuel density measurement in a full-temperature environment, it is necessary to accurately measure the standard density of the fuel in a full-temperature environment. The density of the fuel is detected by a pendant hammer and a balance system. The standard volume of the pendant hammer has passed the laboratory Regular calibration is used to determine the volume. The traditional pendant volume calibration method adopts the method of size measurement. This method is affected by the verticality of the pendant, surface roughness and instrument error. The calibrated volume error is relatively large, which is far from meeting the standard density measurement of fuel oil. needs

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