In order to meet the high precision measurement needs of aero-engine thrust vector

a compact six-component box balance enabling complete decomposition of thrust vector was developed.The balance was mainly composed of three parts: three-component sensors

fixed frame and floating frame.The elastic component of three-component sensor adopted the form of series-parallel combined structure.The simulation of the sensor's elastic component by using the finite element analysis methods showed each measuring component's sensitivity to its own component loading was much higher than other components

and the support components also preferably cut off the interference among measuring components.This conclusion was also verified by the sensor calibration.Through the stiffness and modal analysis of the six-component box balance

the results prove that the balance doesn't need elastic angle correction and the first order natural frequency of the balance is 218.8Hz

which is superior to the design index 180Hz.The six-component box balance calibration shows that the precision of the balance is lower than 3‰ and the accuracy is lower than 5‰.