Balance system with inhibition structure

Abstract

The invention provides a balance system with an inhibition structure and comprises a balance, a small inner-ring shaft, a first bearing, a second bearing, a sleeve, a closing ring and a bearing housing. The front end of the small inner-ring shaft is connected with and matches with the back cone of the balance through a cone; the first bearing and the second bearing closely match with the small inner-ring shaft; the sleeve is arranged on the small inner-ring shaft between the first bearing and the second bearing; the first bearing is fixed by the closing ring and the second bearing is fixed by the small inner-ring shaft; the bearing housing closely matches with the first bearing and the second bearing. The inhibition structure of the invention results in that the normal force, the pitching moment, the lateral force and the yawing moment endured by the model in the test can be absorbed by the bearing and the bearing housing in the inhibition structure, therefore, the measurement of the balance cannot be affected and the rolling moment can be transmitted to the balance basically without any loss; thereby, the invention can effectively reduce the interfere of the rolling moment component due to other components of the balance and improve the measuring precision of the rolling moment.

Description

technical field [0001] The invention relates to a balance system for measuring aerodynamic force, in particular to a balance system with a restraining structure, which is mainly used for measuring the rolling moment in a wind tunnel. Background technique [0002] During wind tunnel testing, the most common method is to use a balance system to measure the aerodynamic load on the model. As shown in Figure 1, the front cone of the balance B in the existing balance system is closely matched with the model C through the balance taper sleeve A, and the rear cone of the balance B is matched with the scimitar frame of the wind tunnel through the balance rod D. Since the model C The reason for the resonance with the balance pole D is that the model vibrates within a certain range of Mach number and attack angle, which causes the aerodynamic signal measured by the balance, especially the distortion of the rolling moment signal. The force of the six-component balance is shown in Figure...

AI Technical Summary

Problems solved by technology

As shown in Figure 1, the front cone of the balance B in the existing balance system is closely matched with the model C through the balance taper sleeve A, and the rear cone of the balance B is matched with the scimitar frame of the wind tunnel through the balance rod D. Since the model C The reason for the resonance with the balance pole D is that the model vibrates within a certain range of Mach number and attack angle, which causes the aerodynamic signal measured by the balance, especially the distortion of the rolling moment signal. The force of the six-component balance is shown in Figure 2 , the X-axis is in the same direction as the incoming air, and the five components in the six-component balance (axial force X, normal force Y, lateral force Z, yaw moment My, pitch moment Mz) interfere with the rolling moment Mx component Larger, increasing the measurement error of the rolling moment

Although a three-component balance without lateral quantities can be designed to improve the reliability and accuracy of rolling moment measurement, the normal force and pitching moment still have a great influence on the rolling moment. Accuracy gains are very limited

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