Design And Research On Six-component Strain Balance For Micro-turbojet Engine

Firstly, the classification and working principle of the six-component force element are introduced. Then, design a basic model of the six-component force element considering the balance design requirements, the strain balance working principle, and the superiority of two end fixe d beam in beam structure. According to the deformation characteristics of the model and combined with two kinds of strain combination connection: two-directional Shear strain measurement and single normal strain measurement. Put forward a set of bridge scheme suitable for the strain output decoupling.The simulation results of the force measuring element and the upper support plate show that the structural strength, maximum deformation can meet the design requirements. Simulation coupling matrix is got by calculating with the output strain of each force, it shows that only small interference exists between each bridge. Reasonable structure design and bridge cloth scheme make the bridge nearly have no coupling output, but can not completely decoupled. At last, design the balance calibration system and developed a balance loading scheme according to the related literature. Calculation formula and related performance parameters are obtained by the experimental data, which show that the six-component can meet the requirement of measuring scales. Contrasting each other found that the experiment and Simulation coupling matrix are uniformity, for the main diagonal elements are significantly greate r than the other interference matrix elements. The same time, through the error analysis shows it’s rationality that the experiment and simulation coupling matrix are different.Although the six-component balance cannot output decoupling completely, there is only small coupling relationship between Each component force. The results show that the integral force element cannot decoupling only by structure, but combing with reasonable strain bridge schemes can largely reduce the coupling degree. The combination of hardware and software design to achieve the balance with non coupling output is effective.