An Efficient Polynomial Chaos Method for Stiffness Analysis of Air Spring Considering Uncertainties

Table 3

Relative error and execution time of different methods.

Initial pressure (MPa)	IRAPC (traditional)			SQ-IRMAPC (proposed)
	Lower bound	Upper bound	Execution time (s)	Lower bound	Upper bound	Execution time (s)
0.50	0.7%	1.2%		1.1%	1.9%
0.60	0.6%	1.3%		1.0%	1.4%
0.68	1.7%	2.1%		1.4%	2.7%