混沌理论中 ,体系的自由度与体系的某个变量的信号的时间序列在相空间重构中的最小嵌套维具有等同性。根据这一概念 ,用LiangyueChao提出的确定无标度时间序列的最小嵌套维的方法 ,通过对气 固流化床中颗粒碰撞压力信号的无标度时间序列在相空间重构中最小嵌套维的计算 ,确定了气 固流化床中颗粒碰撞压力的自由度为 8 In chaos theory, the degree of freedom of the system is equivalent to the smallest nested dimension in the phase space reconstruction of the signal time series of a certain variable of the system. According to this concept, a method of determining the minimum nesting dimension of a scale-free time series proposed by Liangyue Chao is presented in this paper. By using the scale-free time series of particle collision pressure signals in a gas-solid fluidized bed, Dimensional calculation, the degree of freedom of the particle collision pressure in the gas-solid fluidized bed is determined as 8