Strain type two-component surface frictional resistance measuring balance

Abstract

The invention discloses a strain type two-component surface frictional resistance measuring balance. The surface frictional resistance measuring balance is of an integrated structure, and is characterized in that a main body is a cylinder; the upper half part of the cylinder is provided with a through hole I and a through hole II which are bilaterally symmetrical; the upper and lower edges of thethrough hole I and the through hole II are straight edges; the left and right side edges of the through hole I and the through hole II are arc-shaped edges; an entity reserved between the through holeI and the through hole II is an X1 measuring beam; the projection shapes of an upper section and a lower section of the X1 measuring beam are symmetrical arcs; and the projection shape of a middle section of the X1 measuring beam is rectangular; entities reserved on the outer sides of the through hole I and the through hole II are separated through symmetrical straight seams to form symmetrical X1 overload protection seams; the lower half part of the cylinder is provided with a through hole III and a through hole IV which are similar to each other, and an X2 measuring beam and an X2 overloadprotection seam are obtained; and the X1 measuring beam is perpendicular to the X2 measuring beam. The surface frictional resistance measuring balance can simultaneously measure surface frictional resistances in two perpendicular directions on the surfaces of a model and an aircraft, and can realize accurate measurement.

Description

technical field [0001] The invention belongs to the technical field of wind tunnel tests, and in particular relates to a strain type two-component surface friction resistance measurement balance. Background technique [0002] Surface frictional resistance is the resultant force of the shear force on the surface of the aircraft. It is an important part of the aircraft's resistance. Its accurate measurement is of great significance to the aircraft design. At present, there are many difficulties in the surface friction resistance measurement technology: in order to reduce the surface damage of the model or aircraft, only a small area of ​​the surface can be measured, and the friction resistance of the small area of ​​the surface is very small, requiring the measuring balance to have a high enough resolution; in order to facilitate installation And it does not affect the structure of the aircraft, requiring a smaller volume of the measuring balance; for a real aircraft, the flig...

AI Technical Summary

Problems solved by technology

At present, there are many difficulties in the surface friction resistance measurement technology: in order to reduce the surface damage of the model or aircraft, only a small area of ​​the surface can be measured, and the friction resistance of the small area surface is very small, requiring the measuring balance to have a high enough resolution; And it does not affect the structure of the aircraft, requiring a smaller volume of the measuring balance; for a real aircraft, the flight direction is inconsistent with the attitude of the aircraft, and changes all the time, so it is necessary to measure the surface friction resistance in two perpendicular directions to synthesize the total surface friction resistance; the model And the normal load on the surface of the aircraft is much greater than the surface frictional resistance. In the hypersonic wind tunnel, it is also necessary to face the impact load in the process of switching on and off the vehicle. It is required that the measuring balance has high structural rigidity and strength, and must have overload protection. Function

The current surface friction resistance balance is generally large in size, low in measurement resolution, and can only measure single component, which is difficult to solve the above problems

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