居家实验:硬币弹跳HOMEEXPERIMENT——COIN BOUNCING
董佳豪,王槿,李文华,文小青,惠王伟
摘要(Abstract):
本文给出了居家环境下基于智能手机研究硬币弹跳的声学频率和产生的共振模式一种方案。理论上首先根据圆板的振动方程,给出了硬币固有振动频率的表达式。之后结合特定边界条件,利用有限元的方法分析了三种类型硬币的固有振动模式及对应频率。实验上利用智能手机测量了不同硬币在自由振动时产生的声音频率,并与模拟计算结果进行比较,给出了合理的误差分析。该居家实验方案简单有趣,物理原理丰富,易于在基础物理实验教学中推广。
关键词(KeyWords): 硬币;声学频率;智能手机;居家实验
基金项目(Foundation): 2020高等学校教学研究项目(DJZW202010hb);; 港澳与内地高等学校师生交流计划项目(202111120070);; 南开大学“四新”专业课程改革项目(21NKSYSX02)
作者(Author): 董佳豪,王槿,李文华,文小青,惠王伟
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