【摘要】 分析了硬质球体之间连续发生碰撞时出现的啾啾声,通过建立多次碰撞的力学模型,定量给出了碰撞脉冲信号时间间隔减小的调频特性,从而解释了啾啾声的来源.实验结果表明:钢球连续碰撞所产生的声音信号是chirp调频信号冲激串,当碰撞间隔足够短时近似满足几何级数变化关系.基于该理论模型和Matlab软件仿真,声音和波形图都与实验碰撞结果相符合.更多还原

【Abstract】 The"chirping"produced by two hard spheres colliding with each other was analyzed.A dynamic model was set up,and the frequency modulation characteristic was given quantitatively,thus the source of the chirping was explained.The experiment results indicated that the sound signal was chirp-frequency-modulated swash series,when the collision time was short enough,it changed in geometric ratio.According to the theoretical model and experimental parameters,the software simulation was consistent with the real sound signal of the collision both in the wave form and the sound effect.更多还原