OCTOPUS Office 6 Statistics

OCTOPUS Office 6 Statistics is an addition to OCTOPUS Office 6 Basic
and contains the following features:
  • Creation of sea states
  • Creation of scatter diagrams
  • Calculation of spectral moments based on sea state(s) or scatter(s)
  • Automatic selection of best matching sea state dependent RAO with sea state in short term statistics calculations
  • Calculation of design criteria which can be used in Octopus Onboard
  • Viewing short and long term statistics

Analysis sequence to calculate statistics and probabilistics.

Short term response statistics

Short term response statistics can be calculated by combining the design sea states with the best matching set of RAO's.

Responses can be calculated for:
  • the six degrees of freedom
  • vertical relative motions
  • sectional loads in longitudinal, transverse and vertical directions
  • motions, velocities, accelerations (with and without gravity), angular velocities and angular accelerations anywhere on the ship
  • any combinations of the above mentioned responses

Procedure to short-term statistics.

Short term statistics can be calculated for:
  • Sea states
  • Wave scatter diagrams

Short term statistics (sea states).

Short term statistics (wave scatter diagram).

Different operators are available:
  • Most probable extreme
  • Outcrossing probability
  • Number of outcrossings
  • Significant single
  • Significant double
  • Rayleigh probability distribution
Sea states can be defined manually for one and/or two wave systems or can be imported from 3rd-party suppliers.


Long term response statistics

Long term statistics can only be used in combination with wave scatter diagrams. Once the responses are calculated the probability of each sea state and the probability for different headings are use to calculate the long term statistics. By default the value for 1, 2, 5, 10, 20, 50, 10 and 1000 years are calculated.

Long term statistics.

Wave scatter diagram.

Wave scatter diagrams can be defined manually or extracted from the wave scatter database supplied by DNV Classification Notes No. 30.5. The database contains 104 areas with wave scatter diagrams: a wave scatter diagram for the noth atlantic and a world wide wave scatter diagram. Furthermore it is posible to create a wave scatter diagram for a complete voyage. Every single area the voyage passes is weighted by calculating the time spent in the sailed areas.