Research Article
A Cable-Passive Damper System for Sway and Skew Motion Control of a Crane Spreader
Table 1
Numerical values used in simulation.
| | Parameter | Notation | Value |
| | Acceleration of gravity | | 9.80665 (m/s2) |
| | Distance between trolley and spreader | | Minimum: 15 (m)
Maximum: 25 (m)
Used for design: 20 (m) |
| | Cable diameter | | 30 (mm) |
| | Modulus of elasticity | | 2 × 1011 (N/m2) |
| | Trolley cabling point: length × width | × | 5 × 2.9 (m × m) |
| | Spreader cabling point: length × width | 2a × 2b | 5 × 2.5 (m × m) |
| | Spreader dimension | , , | 6 × 2.5 × 1.25 (m × m) |
| | Spreader mass | m | Used for design: 20 (tons),
taken two values in simulation: 20 (tons), 60 (tons) |
| | Spreader inertias in S-frame | , , | , , |
| | Length of short cables | | Taken two values in simulation: 2 (m), 4 (m) |
| | Distance from the short cables to the connection points between the dampers and the spreader | | 1 (m) |
| | Optimal damping coefficient | | Calculated from (1) and (20) |
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