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 |