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叙述了双线摆的结构原理，介绍了此摆小角及大角摆动周期的计算方法，利用双线摆可以测量小型导弹、弹头及其他棒形构件的转动惯量。当Ｒ／Ｌ＜１／３０，≤６０°时，该装置的测量准确度可达１％。
The structure principle of two-wire pendulum is described. The calculation method of the small-angle and large-angle pendulum cycle is introduced. The double-wire pendulum can measure the moment of inertia of small missile, warhead and other rod-shaped components. When the R / L <1/30, ≤ 60 °, the device’s measurement accuracy up to 1%.