A correction method for the influence of the pressure compensation chamber of the calibration box on the high-precision force-measuring balance

A pressure compensation and force measuring balance technology, applied in the field of aerodynamics, can solve the problems of affecting the calibration coefficient of the balance, complex influence of the balance, measurement error, etc., and achieve the effect of reducing the workload of correction and debugging

Active Publication Date: 2021-01-26
LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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Problems solved by technology

Its influence on the balance is very complicated. First, the additional stiffness of the pressure compensation chamber will affect the calibration coefficient of the balance. Second, when there is a pressure difference between the inside and outside, the pressure compensation chamber will generate additional force on the balance, resulting in measurement errors. Third, In the presence of a differential pressure, the stiffness of the pressure compensation chamber changes, further affecting the balance measurement

Method used

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  • A correction method for the influence of the pressure compensation chamber of the calibration box on the high-precision force-measuring balance

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Embodiment Construction

[0036] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.

[0037] Any feature disclosed in this specification (including any appended claims, abstract and drawings), unless expressly stated otherwise, may be replaced by alternative features which are equivalent or serve a similar purpose. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.

[0038] like figure 1 As shown, the calibration box is a sealed box, the box at the rear end is fixedly installed on the ground, the front end is a resident room, the front end of the resident room is sealed, and a standard nozzle is fixedly connected to the inside of the sealed end. The inside of the calibration box is in a vacuum state under working conditions, and the outside is atmospheric pressure, so there is a pressure difference on bot...

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Abstract

This patent discloses a correction method for the influence of the pressure compensation chamber of the calibration box on the high-precision force-measuring balance. The correction method is mainly used to solve the problem that the pressure compensation chamber affects the measurement results of the high-precision force-measuring balance, and can significantly reduce the force-measuring force The measurement uncertainty of the balance, the correction method includes the sensor arrangement and the correction method, through the reasonable arrangement of the pressure sensor, the state parameters of the pressure compensation chamber are monitored, and used as the parameter input for correction; the correction method includes the following four steps: stiffness influence correction, pressure influence Correction, correction of stiffness effect under pressure, correction of standard nozzle combination.

Description

technical field [0001] This patent relates to the field of aerodynamics, in particular to a correction method for the influence of a pressure compensation chamber of a calibration box on a high-precision force-measuring balance. Background technique [0002] There is a very complex mutual interference between the intake and jet flow of turbofan aircraft engine and the external flow around the aircraft. The air intake and jet flow of the turbofan engine suspended under the wing will not only affect the flow under the wing, but also have a greater impact on the flow over the wing and even the flow of the fuselage, which will have a non-negligible impact on the lift-drag characteristics and stability of the aircraft . A small change in the relative position of the nacelle to the wing may result in a large loss of lift and increase in drag. In addition, the engine jet also has a significant impact on the efficiency of the rudder and elevator, thereby affecting the handling cha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M9/06
CPCG01M9/062
Inventor 章荣平刘忠华张逊王勋年陈其盛
Owner LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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