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研究简谐运动可用动力学微分方程和能量求导法,但高中学生没有这样的数理知识。为此,可把匀速圆周运动正交分解成简谐运动,利用分运动和合运动间的关系来研究,并用牛顿第二定律导出其回复力和周期表达式,然后用弹簧振子和单摆的受力特征来验证。最后,用运动的合成与分解来解释扫描法获得振动图象的原理,进而讨论示波管扫描原理和扫描电压特征,并通过两个实例讨论扫描图形与扫描电压和待观察电压的关系。
The kinematic differential equation and energy derivation method can be used to study simple harmonic motion, but high school students do not have such mathematical knowledge. For this reason, the uniform circular motion can be decomposed orthogonally into simple harmonic motion, and the relationship between sub-motion and combined motion can be used to study and the restorative force and periodic expression can be derived by Newton’s second law. Then, Force characteristics to verify. Finally, the synthesis and decomposition of the motion are used to explain the principle of the vibration image obtained by the scanning method. Then the principles of the scanning tube and the scanning voltage are discussed. The relationship between the scanning voltage and the voltage to be observed is discussed through two examples.