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本文介绍的玩具电动机和电话机齿轮组制成的简谐力驱动机构,可以把策动力的频率充分调低(从0.2H_2—1.6H_2)。用此装置组合的受迫振动仪再配合数字毫秒计等仪器,可以测出弹簧振子受迫振动的幅频特性及相频特性曲线,解决了不易测相频特性的难点。本实验装置简单,方法简便,效果较好,易于给学生开出。
This article describes the toy motor and telephone gear train made of harmonic force drive mechanism, the driving force can be fully down the frequency (from 0.2H_2-1.6H_2). With this combination of forced vibrator and digital millisecond meter, the amplitude-frequency characteristic and phase-frequency characteristic curve of the forced vibration of the spring vibrator can be measured and the difficulty of measuring the phase-frequency characteristic is solved. The experimental device is simple, the method is simple, the effect is better, easy to give the students out.