Table 1 Parameters of support hydraulic system
From: Nonlinear Static and Dynamic Stiffness Characteristics of Support Hydraulic System of TBM
Quantity | Symbol | Value | Units |
|---|---|---|---|
Area of rod chamber | \( A_{c} \) | 0.411 | m2 |
Damping coefficient | \( B_{v} \) | 200 | N·s/m |
Piston diameter | \( d \) | 0.915 | m |
Seat diameter | \( D_{\text{s}} \) | 0.02 | m |
Friction force of cylinder | \( F_{\text{fc}} \) | 500 | N |
Spring stiffness | \( k \) | 15 | kN/m |
Piston length | \( l_{\text{c}} \) | 0.26 | m |
Cylinder body mass | \( m_{\text{c}} \) | 2000 | kg |
Valve mass | \( m_{\text{v}} \) | 0.5 | kg |
Supply pressure | \( p_{\text{s}} \) | 23 | MPa |
Kinematic viscosity | \( \upsilon \) | 20 | mm2/s |
Volume of rod chamber | \( V \) | 0.123 | m3 |
Spring pre-compression | \( y_{0} \) | 0.015 | m |
Fluid density | \( \rho \) | 870 | kg/m3 |
Absolute viscosity | \( \mu \) | 0.017 | Pa·s |
Clearance of | \( \delta_{1} \) | 0.01 | mm |
Half cone angle | \( \theta \) | 30 | (°) |
Bulk modulus | \( \beta_{\text{e}} \) | 1.7 | GPa |