METHOD FOR CALIBRATING A STRAIN GAUGE BALANCE AND A DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2022 - IPC C01G23/00 

FIELD: measuring equipment.

SUBSTANCE: proposal relates to measuring equipment, in particular to methods and devices for calibrating strain gauges balances (SGB) designed to measure the aerodynamic force and torque components acting on the aircraft model under test in the wind tunnel flow. The method includes step-by-step application of calibration loads to the shank of a strain gauge balance fixed with their metric part on the measuring frame of the calibration device, interacting by means of connecting rods with single-component model strain gauges respectively installed on the main frame of the calibration device, and recording the output signals of the model strain gauges, measuring elements of the components of the calibrated strain gauge balances and position sensors of the device elements. At the same time, the dependence of the change in the length of each power link “connecting rod - model strain gauge” on the magnitude of the longitudinal load acting on the specified link is preliminarily determined, and then at each step of applying calibration loads to the strain gauge balance before registering these parameters by changing the length of the connecting rods corresponding to the load, the measuring frame is moved to its original position relative to the main one. The device contains a measuring frame connected to a power circuit with the calibrated strain gauge balance for fixing the metric part of the strain gauge balance, interacting by means of connecting rods with single-component model strain gauges installed on the main frame, and loading mechanisms installed on the main frame for interacting with the shank of the calibrated strain gauge balance, element coupling nodes and equipment for recording signals of model strain gauges, measuring elements of components of the calibrated strain gauge balance and position sensors of device elements. Additionally, the device is equipped with a software-controlled mechanism for adjusting the position of the measuring frame relative to the main one in the form of mechanisms for changing the length of these connecting rods, equipped with drives controlled by signals of the corresponding model strain gauges and position sensors of the device elements.

EFFECT: increase in the accuracy of the strain gauge balance calibration method.

2 cl, 2 dwg