1	Ship Impact Analysis
2	Ship Impact Ship Impact is either part of a platform assessment or design criteria 1. Design Criteria - Low energy impact - High energy impact 2. Impact Assessment - Known damage from actual impact
3	Design Criteria Total Kinetic Energy E = ½ A m v² Where A = vessel added mass coefficient m = vessel displacement v = impact speed Total energy is absorbed by: Vessel hull Structure
4	Energy Absorbed DNV curves for up to 5000 MT hull Energy absorbed by structure E_s = E - E_hull
5	Impact Assessment Apply measured displacement at impact location
6	Load Sequence Dead Load and Weights Apply dead load and weights first Apply appropriate live loads Use combinations if possible (requires “CMB” option) Impact Increment impact load* 2. May need to refine increment size near capacity
7	Survivability Structure sufficient to absorb required energy or displacement
8	Post Impact Ensure survivability from design environment after impact event Include: 1. Impact damage 2. Residual stresses from impact
9	Load Sequence Dead Load and Weights Apply dead load and weights first Apply appropriate live loads Impact Increment impact force* Unload impact force
10	Load Sequence (cont’d) Design Environmental Load Increment design environmental load* 2. May need to refine increment size near capacity
11	Ship Impact Analysis