$k$.	aging reaction rate
$T$	aging temperature
$A$	a temperature-independent constant
$a$,$b$	regression coefficients
$E_a$	apparent activation energy of the aging reaction
$E_b$	equivalent linear activation energy
$R$	ideal gas constant
$n$	power factor
$\alpha$	time-independent constant
$a$	acceleration factor
$a_{old}$	acceleration factor obtained using the traditional Arrhenius equation
$a_{new}$	acceleration factor obtained using the improved Arrhenius equation
$P$	aging performance degradation index
$y$	logarithm of the aging performance degradation index $P$
${\widehat{y}}_{ij}$	estimated value of $y$
$t$	aging time
$\epsilon$	compression set retention
$x_i$	vector to be solved for the artificial bee colony algorithm
$x_i^j$	value of each dimension of $x_i$
$v_i^j$	alternative value of $x_i^j$ from neighborhood search
$Limit$	upper limit of the number of searches for a single nectar source by artificial bee colony algorithm
$ite{r}_{\max }$	maximum number of iterations of artificial bee colony algorithm