系统动力学软件vensim学习之一阶负反馈
此时GL值为100，LEV状态1初始值为10，具体实现编码，及仿真结果如下。
(01) CONST比例常数=
0.1
Units: **undefined**
(02) DISC偏差3=
GL-LEV状态1
Units: **undefined**
(03) FINAL TIME = 100
Units: Month
The final time for the simulation.
(04) GL=
100
Units: **undefined**
(05) INITIAL TIME = 0
Units: Month
The initial time for the simulation.
(06) LEV状态1= INTEG (
RT速率2,
10)
Units: **undefined**
(07) RT速率2=
CONST比例常数*DISC偏差3
Units: **undefined**
(08) SAVEPER =
TIME STEP
Units: Month [0,?]
The frequency with which output is stored.
(09) TIME STEP = 1
Units: Month [0,?]
The time step for the simulation.
对应Gl（目标值为0），LEV状态1初始值为100，对应编码及仿真结果如下：
(01) CONST比例常数=
0.1
Units: **undefined**
(02) DISC偏差3=
GL-LEV状态1
Units: **undefined**
(03) FINAL TIME = 40
Units: Month
The final time for the simulation.
(04) GL=
0
Units: **undefined**
(05) INITIAL TIME = 0
Units: Month
The initial time for the simulation.
(06) LEV状态1= INTEG (
RT速率2,
100)
Units: **undefined**
(07) RT速率2=
CONST比例常数*DISC偏差3
Units: **undefined**
(08) SAVEPER =
TIME STEP
Units: Month [0,?]
The frequency with which output is stored.
(09) TIME STEP = 1
Units: Month [0,?]
The time step for the simulation.
减半时间常数约等于0.69被的系统时间常数。
系统时间常数为CONST常数的倒数。