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The elastomer of integral box six-component strain balance is processed by the whole piece of elastic material. The box six-component strain balance is mainly composed of a fixed frame, a floating frame, measuring elements and elastic linkage mechanisms. Seven cantilever measuring elements with rectangular cross-section are fastened on the fixed frame, and connect with the floating frame though the corresponding elastic linkage mechanisms. Thrust vector is decomposed into three directions of orthogonal force and moment. Due to such problems of mini aviation engine as relatively thrust vector, each component of force and moment mismatch, and relatively large vibration and so on, in this paper, the box six-component strain balance is firstly adopted to carry out the thrust vector measurement of the mini aero-engine. The layout of balance and the optimization design of measuring element parameters are presented considering the sensitivity and stiffness of the balance for the mini aero-engine. Finite element analysis shows that the sensitivity of the measuring element for the corresponding component is much higher than that of other components, and the interference between the measuring elements are better blocked by the elastic linkage mechanisms. The balance of stiffness and modal analysis indicates that the rigidity of the balance is relatively high without the elastic correction; and the inherent frequency is 249Hz for meeting the design requirement. The calibration result of the balance shows that the measuring error of the balance for each component is lower than 0.3%, and the error of the measuring accuracy is lower than 0.5%. The simulated and experimental results demonstrate that the six-component strain balance meets the requirements of thrust vector measurement for the mini aero-engine.

Resarch on six-component strain balance for thrust vector measurement of the mini aero-engine