why this happen when i run fuzzy logic simulink model?

firstly, i run this model from sltank.. i delete PID part because i only want to use fuzzy part..

after that,run the system, this what comparison show me

this program use "tank".. i run " fuzzy tank" i check.. there have 9 rule there..

i found 1 tutorial that say if it reduce to 5 rule.. the damping from underdamped change to critically damped.. i try to test and change it into 5 rule, the result will be same with 9 rule

how this happen? can i build the system using this fuzzy simulink model and get my graph damping to critically damped?

[Arkadiy Turevskiy]

what version of MATLAB and Fuzzy Logic Toolbox are you using?

Do

>>ver

and post the output here