A Hybrid Method for Truss Mass Minimization considering Uncertainties

Table 2

Results obtained using the optimization methods (10 bar truss).

Parameters	GA	FMA	PSO	SQP	SORA/SQP [6]	HGPS
Best mass value (kg)	1447.04	1667.75	1253.75	1256.10	1253.91	1252.31
	3.004	3.181	3.004	3.000		3.000
	3.001	3.000	3.000	3.000		3.000
number of objective function evaluations	9031	10005	2012	3207	4030	2454
number of evaluations	15630	16028	12121	4580	1775	29640
Efficiency	4.24	4.48	2.43	1.34	1.00	5.53
Quality	1.155	1.332	1.001	1.003	1.001	1.000
()
()
()
()
()
()
()
()
()
()

number of LSF evaluations: the mean number of times the probabilistic constraints are evaluated in order to get the reliability index (20 independent runs).
is assumed that the constraints become active. The original paper did not mention this value.