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Figure 8.
Figure 9.
Figure 10.
Figure 11.
Input Parameters and reference values of the tests
| Input Parameters | ||
|---|---|---|
| Parameter Name | Value | Unit |
| Shock Absorber Pressure | 0.95 | MPa |
| Tyre Pressure | 0.31 | MPa |
| Vertical Landing Speed (Limit) | 2.93 | m/s |
| Horizontal Landing Speed (Limit) | 37.8 | m/s |
| Reference Values | ||
| Vertical Force (Fz) | 17.38 | kN |
| Horizontal Force (Fx) | 6.40 | kN |
| Acceleration Coefficient (nz) | 4.86 | - |
| Landing Gear Deflection (Uk) | 183.5 | mm |
| Shock Absorber Deflection (Ua) | 115.8 | mm |
I-31 Nose Landing Gear parameters
| Parameter Name | Value | Unit |
|---|---|---|
| Configuration | telescopic | - |
| Aircraft Landing Mass | 1117 | kg |
| Aircraft Landing Weight | 1096 | daN |
| Vertical Landing Speed (Limit) | 2.93 | m/s |
| Horizontal Landing Speed (Limit) | 37.8 | m/s |
| Acceleration Coefficient during landing with Limit Vertical Landing Speed | 4.86 | - |
| Maximum Tyre Deflection | 68 | mm |
| Maximum Shock Absorber Deflection | 124.6 | mm |
Dynamic Tests (Limit Conditions) – Stress on Half Fork
| Parameters | 1st charging | 2nd charging | Unit |
|---|---|---|---|
| Value | |||
| ZD – outside (opposite to wheel axis side) bottom | 275.67 | 313.52 | MPa |
| WD – outside (opposite to wheel axis side) bottom | -316.13 | -323.31 | MPa |
| ZG – inside (wheel axis side) top | 246.59 | 248.41 | MPa |
| WG – inside (wheel axis side) top | -266.32 | -277.75 | MPa |
| Vertical Force (Fz) | 17.47 | 18.04 | kN |
Dynamic Tests (Limit Conditions)
| Parameters | Reference | 1st charging | 2nd charging | Unit |
|---|---|---|---|---|
| Value | ||||
| Shock Absorber Pressure | 0.95 | MPa | ||
| Tyre Pressure | 0.31 | MPa | ||
| Landing angle (φ) | 0° | |||
| Vertical Landing Speed (Vz) | 2.93 | 2.93 | 2.93 | m/s |
| Horizontal Landing Speed (Vx) | 37.8 | 39.06 | 40.07 | m/s |
| Vertical Force (Fz) | 17.38 | 17.47 | 18.04 | kN |
| Horizontal Force (Fx) | 6.40 | 7.1 | 7.6 | kN |
| Acceleration Coefficient (nz) | 4.86 | 4.80 | 4.89 | - |
| Landing Gear Deflection (Uk) | 183.5 | 189.3 | 185.8 | mm |
| Shock Absorber Deflection (Ua) | 115.8 | 116.1 | 114.3 | mm |
Static Tests/Characteristics
| Characteristic points | 1st charging | 2nd charging | Unit |
|---|---|---|---|
| Value | |||
| P1 | 182 | 207 | daN |
| P2 | 1109 | 1206 | daN |
| P3 | 904 | 956 | daN |
| P4 | 74 | 68 | daN |