Stability Analysis of Multispan Pipeline Embedded in Temperature-Dependent Matrix

Table 3

Instability modes and critical points under different span combinations.

Span combination	Instability mode (U m/s)	Instability mode (p N/m^2)
L1 = 10 m, L2 = 10 m	1st order divergence instability 252	1st order divergence instability; 5.1 × 10^7
	1st and 2nd order divergence instability 344	1st and 2nd order divergence instability 9.3 × 10^7
L1 = 12 m, L2 = 8 m	1st order divergence instability 252	1st order divergence instability; 5.05 × 10^7
	1st and 2nd order coupling divergence instability 348	1st and 2nd order divergence instability 9.65 × 10^7
L1 = 16 m, L2 = 4 m	1st order divergence instability 248	1st order divergence instability; 4.9 × 10^7
	1st and 2nd order coupling flutter instability 332	1st and 2nd order divergence instability 9.05 × 10^7