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Table 1
Simulation parameters.
| Parameter name | Description | Value | Units |
|---|---|---|---|
| A 1 | Action area of rodless cavity | 6.36 × 10−3 | m2 |
| A 2 | Action area of rod cavity | 4.77 × 10−3 | m2 |
| mt | Mass of the piston | 7.0 | Kg |
| BP | Viscosity damping coefficient | 0.2 | (N · s)/m |
| Kz | Spring stiffness | 8.0 × 102 | N/m |
| FL | External load | 3.92 × 104 | N |
| V 1 | Total volume of rodless chamber | 2.5 × 10−3 | m3 |
| V 2 | Total volume of rod chamber | 2.03 × 10−3 | m3 |
| βe | Liquid bulk elastic modulus | 1.7 × 109 | N/m2 |
| Ci | Internal leakage coefficient | 5.1 × 10−13 | m5/(N · s) |
| Ce | External leakage coefficient | 3.0 × 10−13 | m5/(N · s) |
| Cd | Flow coefficient of valve port | 0.61 | |
| w | Valve area gradient | 3.14 × 10−2 | m2/m |
| U | The open size of valve at zero position | 1.0 × 10−3 | m |
| ρ | Oil density | 8.5 × 102 | kg/m3 |
| PS | System pressure | 8.0 × 106 | Pa |
| P 0a | Initial pressure of accumulator | 6.0 × 106 | Pa |
| V 0a | Initial volume of accumulator | 6.3 × 10−3 | m3 |
| P 10 | Initial pressure of rodless cavity | 7.5 × 106 | Pa |
| P 20 | Initial pressure of rod cavity | 1.78 × 106 | Pa |
| KC 1 | Flow-pressure gain coefficient of rodless cavity | 5.4 × 10−11 | m5/(N · s) |
| Kq 1 | Flow gain coefficient of rodless cavity | 0.868 | m2/s |
| KC 2 | Flow-pressure gain coefficient of rod cavity | 4.1 × 10−11 | m5/(N · s) |
| Kq 2 | Flow gain coefficient of rod cavity | 1.1393 | m2/s |
| An | Cross-sectional area of pipeline | 1.38 × 10−3 | m2 |
| Aa | Cross-sectional area of accumulator | 1.13 × 10−2 | m2 |
| me | Quality of oil in accumulator | 1.49 | kg |
| Be | Equivalent damping coefficient of oil | 0.2 | (N · s)/m |
| Ka | Stiffness coefficient of gas | N/m |
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