ME369-系统模型、分析与控制 6.1瞬态响应和稳态响应 School of Mechanical Engineering ME369-lecture 6.1 Shanghai Jiao Tong University Fal12015 线性系统 ym+an-y-l)+…+a2j+a少+ay=bn2tm+…+bi+b,u 叠加原理 Input Linear System 山(0 为(0 2(0 (0 k(0+k(0 自由响应(Free response)-一对于初始状态的响应 强迫响应(Forced response).一对于输入的响应?【典型输入信号 School of Mechanical Engineering ME369-lecture 6.1 Shanghai Jiao Tong University Fall 2015 1
1 ME369-lecture 6.1 Fall 2015 School of Mechanical Engineering Shanghai Jiao Tong University 6.1 瞬态响应和稳态响应 ME369-系统模型、分析与控制 ME369-lecture 6.1 Fall 2015 School of Mechanical Engineering Shanghai Jiao Tong University 线性系统 叠加原理 ?! 典型输入信号 自由响应 (Free response)--对于初始状态的响应 强迫响应 (Forced response) -- 对于输入的响应 ( ) ( 1) ( ) 1 2 1 0 1 0 n n m n m y a y a y a y a y b u b u b u
[例1]全响应 少+5y=10u u(t)=5t 0)=2 School of Mechanical Engineering ME369-lecture 6.1 Shanghai Jiao Tong University Fall 2015 r(t) c(r) 误差允许范围 强烈振荡过程 (allowable tolerance) 振荡过程 微振荡过程 ?稳态响应(stead-steady response) ?瞬态响应(transient response) 定性/定量 ?稳定性 ?误差 ?快速 School of Mechanical Engineering ME369-lecture 6.1 Shanghai Jiao Tong University Fall 2015 2
2 ME369-lecture 6.1 Fall 2015 School of Mechanical Engineering Shanghai Jiao Tong University [例1] 全响应 y y u 5 10 u t t ( ) 5 y(0) 2 ME369-lecture 6.1 Fall 2015 School of Mechanical Engineering Shanghai Jiao Tong University ? 稳定性 ? 误差 ? 快速 定性 /定量 ? 稳态响应(stead-steady response) ? 瞬态响应(transient response ) 误差允许范围 (allowable tolerance)