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弦振动实验,是力学实验的基本内容之一.原装置,如图1所示. 该装置是采用音叉激振.当调节螺钉与弹簧片接触后,电源接通,电磁铁吸引音叉,弹簧片和螺钉脱开,电源切断,电磁铁线圈断电,音叉又恢复原来位置.这样,音叉 在电磁力的周期重复作用下处于共振状态,从而达到对弦线激振的目的.实践证明,这一装置有如下缺点:
The string vibration experiment is one of the basic contents of the mechanical experiment. The original device is shown in Fig. 1. The device uses a tuning fork to excite the vibration. When the adjustment screw is in contact with the spring piece, the power is turned on, the electromagnet attracts the tuning fork, and the spring piece. When the screw is disconnected and the power is cut off, the solenoid coil is de-energized, and the tuning fork is restored to its original position. In this way, the tuning fork is in a resonant state under the repeated action of the electromagnetic force cycle, so as to achieve the purpose of exciting the string. Practice has proved that this The device has the following disadvantages: