random chain meaning in English

无规链

Finally , the results are compared with periodic and random chains . then we studied acoustic wave propagation in 1d quasiperiodic and aperiodic systems by means of he transfer matrix . transmission rate , reflection rate , energy flow , logarithmic energy flow , energy density and lyapunov exponent are computed numerically , and compared with periodic and random system
其次研究了声波在几种一维准周期和非周期系统中的传播，通过转移矩阵的方法，数值地得到了系统的传播系数t _ n 、反射系数r _ n 、能流密度j _ n ，能量密度e _ n和lyapunov指数，给出了以上各量与传播长度n以及频率之间的关系，同时发现能流及能量密度都具有分形结构，并与周期和随机系统的结果作了比较。