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Table 2 The stiffness fitting function and parameters

From: Modelling and Dynamic Characteristics for a Non-metal Pressurized Reservoir with Variable Volume

Parameters

Value

K1(N/mm)

f(x)=a1x4+a2x3+a3x2+a4x+a5

a1(N/mm5)

2.401×10−7

a2(N/mm4)

4.105×10−5

a3(N/mm3)

− 0.006157

a4(N/mm2)

0.2066

a5(N/mm)

− 5.315