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Acta Armamentarii ›› 2022, Vol. 43 ›› Issue (7): 1628-1635.

• Paper •

### A Collaborative Method for Measuring the Triaxial Moment of Inertia Using the Vertical Vibration Compound Pendulum andCircular Torsion Pendulum

LU Zhihui， SUN Haozhi， WANG He， YANG Hongtao， WU Yiyong

1. （Zhengzhou Research Institute of Mechanical Engineering Co.，Ltd.，Zhengzhou 450052，Henan，China）
• Online:2022-04-12

Abstract: A missile warhead in the horizontal posture is supposed to rotate 90 degrees during a moment of inertia measurement. To simplify the measuring process for mass property parameters, a coordinative triaxial measuring method for moment of inertia is proposed based on the use of both a vertical vibration compound pendulum and a circular torsion pendulum. The structure of the measuring device and the calculation principle are also introduced. The difference relation between the components of the two moments of inertia along the y and z directions of the missile warhead in the vertical posture is obtained by measuring swing periods along the two axes. The method is more convenient than using the proportional relation, and it is equal to the difference relation between the components of the two moments of inertia based on the vertical vibration compound pendulum axis. The results show that the other moment of inertia can only be calculated by measuring a moment of inertia in the horizontal posture, with a maximum measuring error of 0.35 kg·m2 which meets the accuracy requirement of 1 kg·m2 for the finalized measuring device. The new method combines the advantages of both vibration pendulum and torsion pendulum, and improves the convenience and accuracy for measuring the triaxial moment of inertia.

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