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Table 2 Membership functions

From: GA-based multi-objective optimization of active nonlinear quarter car suspension system—PID and fuzzy logic control

MF Input 1 (e) Input 2 (ec) Output (f)
NL [− 1– 1 − 0.7 − 0.4] [− 1 − 1 − 0.6 − 0.3] [− 1 − 1 − 0.9 − 0.6]
NM [− 0.7− 0.5 − 0.3 − 0.05] [− 0.6 − 0.4 − 0.3 − 0.1] [− 0.9 − 0.7 − 0.5 − 0.2]
NS [− 0.4 − 0.2 − 0.1 0] [− 0.3 − 0.2 − 0.1 0] [− 0.6 − 0.3 − 0.2 0]
ZE [− 0.05 − 0.01  0.01 0.05] [− 0.1 − 0.025 0.025 0.1] [− 0.2 − 0.05 0.05 0.2]
PS [0 0.1 0.2 0.4] [0 0.1 0.2 0.3] [0 0.2 0.3 0.6]
PM [0.05 0.3 0.5 0.7] [0.1 0.3 0.4 0.6] [0.2 0.5 0.7 0.9]
PL [0.4 0.7 1 1] [0.3 0.6 1 1] [0.6 0.9 1 1]