Design Of Calibration System For Wind Tunnel Balance With Six-components Load

The balance, which is widely applied in aviation, astronautics, architecture, high-speed engines and weapon's manufacture, is the professional testing equipmentin aerodynamic experiment. The balance must be calibrated for deflection-component load for improving the measure precision before it was put in use. This thesis has completed the design work of balance's calibration system. The major work and result are as follows:A collectivity project about the calibration system of wind tunnel balance with six components is proposed and consists of several functional modules such as mechanical structure, measuring system, weighting equipment and mathematics correction. Each function module is accomplished in Inventor, Ansys and Delphi.According to an analysis of calibration system's operation process and work principle, the main sources of error in the calibration system are analyzed. In order to improve the system's precision, reduce its cost and decrease its adjust cycle, the system's bearing base, project of calibration with non-repositioning and six components weighting system are designed, mathematic correction and data processing software are developed, and the machine's main parts, support pole, is analyzed in the finite element method.In the design of measurement system of 6 degrees of freedom of displacement and orientation, the non-contacted high-precision measurement is adopted. This method can get a high precision and satisfy the demand of technology. Both laser emitter and PSD photoelectric displacement and orientation sensor are mature technical products, and this method has a lower cost compared with other methods.In the design of weighting system of six components, a reliable system called poises weighting system, is introduced. Transforming mechanism of component load direction is designed after analyzing component loads error's sources. The analysis and calculation of concomitant error from transforming mechanism have also been done to make sure that weighting system can satisfy requirement for precision.On the basic of accurate modeling, the deflection data of machine's foremost part, support pole, is obtained by the finite element method. The analysis result shows that the system designed can satisfy technical requirement, and work crediblyand precisely.In the part of exploitation of software system, data-base management system (DBMS) is developed by using both software exploitation platform Delphi and desktop data base Access to collect, save, process, inquire, correct, print and export data.