单自由度振动系统，求其频响函数，改变质量，阻尼，刚度对频响函数的影响-Single degree of freedom vibration system, find the frequency response function, changing the impact mass, damping and stiffness of the FRF

matlab计算声子晶体频响函数源代码，附计算数据案例-The matlab calculation of phononic crystal frequency response function source code, with the calculated data case