Aiming at the two problems of large interphase interference and low natural frequency of large lengthdiameter ratio model force measurement balance

on one hand

theoretically obtain the position of external force point of action under the minimum interphase interference;on the other hand

obtain the optimal span of sensor at the highest natural frequency by ANSYS analysis. According to the position of external force point and the optimal span

the balance structure is designed. The performance of the designed piezoelectric balance is evaluated

calculate the static precision indexes such as nonlinearity

repeatability and interphase interference. Test results show that the piezoelectric balance possesses the advantages of small interphase interference of 2 %

large scale of12 000 N

high natural frequency of 600 Hz

and so on.