Speed 3 - online utility on ToolBox.
Rope friction descent by Euler-Eytelwein: T_load/T_hold = e^(μ·θ), θ=2πn (n wraps); control tension T_ctrl = m·g/e^(μθ); acceleration a = g/e^(μθ), final speed v=√(2ah), braking share (1−1/e^(μθ))×100%.
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Descent principle | v = √(2gh·η_f) with friction factor | Energy conservation |
| Rated load | 100 kg rated, 150 kg max | GB 24543-2009 §5 |
| Heat limit | Cooldown after 60 m continuous | GB 24543 commentary |
| Safety factor | SFS ≥ 10 | GB 24543-2009 |
| Human tolerance | ≤2 m/s impact energy | Rescue equipment studies |
| Repetitive use | ≤30 cycles per incident | GB 24543-2009 |
利用绞盘(Capstan)摩擦原理,估算缓降器在不同包绕圈数、摩擦系数下的控制端受力与理论下降速度,为高空救援训练与器材使用提供参考。