探究声音对亥姆霍兹旋转木马的影响

Impact of sound on the Helmholtz carousel

研究了声音频率和响度对亥姆霍兹旋转木马的影响,并测量了亥姆霍兹旋转木马转动最快时的声音频率.理论推导出品质因数和共振频率的计算公式,分析得出品质因数与共振频率成正比.基于Forchheimer的非线性关系,发展了计算共振器入口振动的理论模型,计算出了亥姆霍兹共振器入口的非线性作用力,分析了非线性作用力和品质因数、声压之间的关系:品质因数和声压越大,非线性作用力越大,亥姆霍兹旋转木马旋转越快.

The impact of sound frequency and loudness on the Helmholtz carousel was studied. The velocity of the Helmholtz carousel was measured. The equations of the quality factor and reso- nant frequency were deduced. The resonant frequency was proportional to the quality factor. In view of the non-liner relationship of Forchheimer, a theoretical model to measure the vibration and nonlin- ear force at the entrance of Helmholtz resonator was set up. The relation among the nonlinear force, the quality factor and the sound pressure was analyzed. The nonlinear force and the rotation speed increased with increasing quality factor and sound pressure.