Documents

mixed lecture notes, presentations, manuals

Ship Stability

What is parametric roll?
M Huss 2014, (English, 3(+2) pages, pdf 0.5M)
A popular description of parametric roll published in The Swedish Club magazine Triton No.1 2014

Probabilistic rules for damage stability - current status
M Huss 2010, (English, 6 pages, pdf 0.1M)
A personal review of what has been achieved through the new harmonized standard in SOLAS 2009 presented at the GOALDS workshop in Glasgow, September 2010.

Fartygs stabilitet
M Huss 2007 - Sjöfartens handböcker, Jure förlag AB (Swedish, 180 pages, ISBN 978-91-7223-257-0). A comprehensive illustrated text book describing both the physics and the practical application of ship stability.

Goal-based standards

Pågående arbete med mål- och funktionsbaserade regler inom IMO
M Huss 2009, (Swedish, 21 pages, pdf 0.4M). A presentation held at Transportforum 2009, Linköping, January 2009

Status at IMO: Where are we heading with goal-based standards?
M Huss 2007, (English, 8 pages, pdf 0.2M). A presentation held at the SAFEDOR mid-term conference in Brussels , May 2007

Geometric Modelling

Introduction to Parametric Curves
M Huss 2003, (English, 17 pages, pdf 1.2M). A brief introduction to the math behind parametric curves and the application in ship hull modelling.

Ship Structural Design

Skrovkonstruktion - Beräkningsmetoder
M Huss 1996, (Swedish, 295 pages, pdf 3M). Lecture notes on ship structural design methods.

Skrovkonstruktion - Beräkningsexempel
M Huss 2000, (Swedish, 62 pages, pdf 0.4M). Working examples on ship structural design methods.

Waves and wave induced ship motions

Notes on the modeling of irregular seas in time simulations
M Huss 2010, (English, 15 pages, pdf 4M). The note suggests to use period spectra instead of frequency spectra for the generation of irregular wave sequences.

Vågor och Gensvar
M Huss 1983, (Swedish, 138 pages, pdf 3M). A comprehensive illustrated compendium about statistical methods for describing irregular waves and responses in waves.

Hyss Program Manuals

Hyss 2.2 Users Manual
M Huss 2004, (English, 70 pages, pdf 3M). A rich illustrated manual to the Excel-based application Hyss. It takes you from start to advanced professional use.

Hyss 2.2 Användarmanual
M Huss 2004, (Swedish, 70 pages, pdf 3M)

old reports

Operational Guidance on Seakeeping

Theoretical Seakeeping Predictions On Board Ships
M Huss, A Olander 1994, (English, 93 pages, pdf 3M)

Abstract:
A prototype of an on board based guidance and surveillance system for waveinduced effects on ships has been developed. The system includes a complete model of the ship for direct hydrostatic and hydrodynamic analysis of arbitrary operating conditions. The sea state is evaluated from measurements of the ship motions. Criteria for warnings of non-desired events can be initiated on board. The system can work as an automatic real time monitoring system which will alert the bridge officer when risk levels are exceeded. At the same time advice can be given on changes of speed and heading that will decrease the risk. The system can also be used in a manual mode for analysis of forthcoming situations in order to optimise the operation of the ship.

Combined Wave Induced Stresses in Ships - Application of a rationally based direct calculation method

Summary
M Huss 1991, (English, 30 pages, pdf 1.3M)

Part 3; Prediction of Combined Long-Term Wave Induced Stresses and Corresponding Fatigue Damage in a Ship's Bottom Girder
M Huss, G Lidvall 1990, (English, 30 pages, pdf 0.9M)

Part 2; Combined Wave Induced Stresses in an OBO Carrier
M Huss 1990, (English, 104 pages, pdf 2.8M)

Part 1; Combined Wave Induced Stresses in a Lo/Lo Container Ship (Appendices not included)
M Huss 1987, (English, 79 pages, pdf 2.1M)

Abstract:
Calculations of combined wave induced stresses in longitudinal and transverse primary members of ship structures have been performed with a direct method. The wave loads are calculated with linear strip-theory and include global hull girder moments and shear forces, and local loads from external hydrodynamic pressure and internal inertia forces from the cargo. Structural response is calculated by ordinary hull beam idealization for global loads and finite-element analysis for local loads. Results from the linear structural analysis are coupled to wave loads with discrete influence coefficients. Transfer functions of combined stress response in regular waves are obtained by superposition of the different wave induced stress components considering their phase lag. Non-linear stress response from hydrodynamic pressure fluctuation close to the still-water line is evaluated by a simplified time step procedure where the ship motions and global loads are assumed to be linear. Short-term and long-term linear stress responses are calculated for standard wave energy spectra and wave statistics for the North Atlantic. The statistical correlation between different stress components is analysed and shown to be important to take into account at the design stage. Of special importance is the counteracting effect of external hydrodynamic pressure and internal mass forces in full cargo holds. The influence of different load conditions, speed reduction, and non-linear effects on the long-term stress distribution is discussed. Fatigue analysis of a few typical hot-spots are performed considering local geometric stress concentrations and the correlation between nominal normal and shear stresses. The direct calculation method is found to yield reasonable results and could be advantageous to introduce in the design process especially for novel type of ship structures and for highly optimized structures where the specific ship characteristics must be considered.

Stability in Waves

The Stability of Ships in Waves - A comparative studie of modern hull forms with large B/T ratio
M Huss 1988, (English, 25 pages, pdf 0.7M)

Abstract:
The variation of initial stability in waves has been studied for different hull forms with large B/T. The study was performed in regular following waves with close to zero encountering frequency as well as in regular waves with a frequency in resonance with parametric excitation of roll. The variation of restoring moment was calculated with a quasi-static approach taking into account the influence from the position of the wave profile and the ships vertical motions calculated with linear strip theory. The study shows that both the sectional forms of the hull and the B/T ratio has a significant influence on the stability variation in waves.

Accident investigation of the M/V ESTONIA disaster 1994-09-28

A technical summary
M Huss 1999, (English, 18 pages, pdf 2.2M). A brief introduction to the technical investigations and conclusions.

Slutrapport, ISBN 91-38-31458-4
(Swedish, 229 pages, pdf 5M)

Final Report, ISBN 951-53-1611-1
(English, html-link). © The Joint Accident Investigation Commission of MV ESTONIA and Edita Ltd.

miscellaneous

Sudoku Solver

SudokuSolver.xls
M Huss 2005, (English, Excel Workbook with VBA-macro, 0.1M)

Are you looking for unlimited problems to solve or just tired of spending time on nonsens? Try my small sudoku solver, and do the work in seconds! It helps to solve sudokus as well as creates and reduces new ones based on randomly selected numbers. It is absolutely harmless, efficient - and free.