Limiting Criteria. Max overall inclination [deg] 2 (living module) / 7 energy module Max inclination angle between modules [deg] 2 Max draught difference between neighbouring modules [m] - Max acceleration in 6 degrees of freedom [m/s2] 0.15m/s² (living module) / 2m/s² (energy module) Max metres of green water on deck [m] -
Limiting Criteria. Max overall inclination [deg] Intact stability criteria global inclinations: Formula max. inclination for floating residential areas: Max inclination = atan(2* freeboard ) platform length Most of the year a max. inclination for floating residential areas (floating city and workers living quarters) of 1 degree should not be exceeded for the serviceability limit state. (99% of the time (1% exceedance = 3.65 days per year)) Based on typical platform dimensions (freeboard<platform length/25), and in order to prevent deck wetness ('shipping green water'), a max of 5 degrees should rarely be exceeded. (e.g. 1/1000y exceedance) N.b. 5 degrees are also the limit for furniture toppling over and endangering disabled people (e.g. wheelchairs). Max inclination angle between modules [deg] Max vertical height difference between module edges: ideally only 10 mm. Larger vertical height differences can be accommodated by placing something over the gap (length can be chosen to keep inclination below 1 degree). Max size of this bridging element is ≈ 10 m. Assuming a max inclination of 1:20, this bridge could cope with height differences of up to 0.5 m Max draught difference between neighbouring modules [m] See previous item Max acceleration in 6 degrees of freedom [m/s2] Vertical accelerations/heave motion (most important indicator for human comfort) Floating city Most of the year a max. RMS vertical acceleration of 0.15 m/s² in each octave band should not be exceeded for the serviceability limit state (99% of the time (1% exceedance = 3.65 days per year)) Workers island living area Most of the year a max. RMS vertical acceleration of 0.2 m/s² in each octave band should not be exceeded for the serviceability limit state (99% of the time (1% exceedance = 3.65 days per year source: *DS01) Horizontal accelerations/lateral motions (less relevant in terms of motion sickness, but important because of safety. Sources: ITTC, 1999; NORDFORSK, 1987) Floating city max. RMS horizontal acceleration: 0.03 g and 0.03 g/s (= 0.3 m/s2 and 0.3 m/s) (99% will keep balance without holding) Workers island living area max. RMS horizontal acceleration: 0.07 g (= 0.7 m/s2) (99% will keep balance without holding) Bridging element between platforms must withstand the vertical and lateral accelerations in the serviceability limit state. Max metres of green water on deck [m] 0 m. In areas where it is anticipated it could be up to 1m as long as safety of people is ensured. A 1m water mass could easily k...
Limiting Criteria. Max overall inclination [deg] Unknown, but need to be kept low to avoid sloshing Max inclination angle between modules [deg] Unknown Max draught difference between neighbouring modules [m] 1 m Max acceleration in 6 degrees of freedom [m/s2] Unknown, but important to minimize sloshing Max metres of green water on deck [m] 0
Limiting Criteria. Max overall inclination [deg] 1 deg (due to dynamic motion= 0.5 deg up or down) Extra Static inclination of 1 deg is acceptable Max inclination angle between modules [deg] 2 deg Max draught difference between neighbouring modules [m] 1 m Max acceleration in 6 degrees of freedom [m/s2] For Ship to Shore (STS) cranes: Maximum operation limit 1 m/s² at trolley height in trolley ride direction. Perpendicular to the trolley ride direction 0.5 m/s². Max metres of green water on deck [m] 0
