Teemu Manderbacka

• Naval Architect, D.Sc.(Tech.)
• Research Team Leader at VTT Technical Research Centre of Finland

Ship collisions can result in catastrophic outcomes, necessitating effective real-time collision risk assessment methods for proactive risk management. These methods need to rapidly evaluate both the probability of collision and the potential damage dimensions (length, height, and penetration) in real conditions. Existing frameworks often underesti...

Shipping companies are taking concrete actions in driving decarbonisation. This chapter provides case studies demonstrating the actions and is written particularly for shipowners and charterers. In this chapter, the authors advocate shipping companies join coalitions to learn, align and take collective action. They present cases of wind assisted pr...

Research communities have an important role in decarbonizing maritime transport by identifying and developing technologies and strategies that can reduce greenhouse gas emissions from shipping. The authors of this chapter describe the different types of research available and the related constraints. They point out the need for global research coll...

Purpose: Ports play a vital role in global trade and commerce. While there is an abundance of analytical studies related to ship operations, less work is available about port operations and infrastructure. Information about them can be complicated and expensive to acquire, especially when done manually. We use an analytical machine learning approac...

Post-accident safety of ships is governed by damage stability, affected by watertight subdivisions which limit accidental flooding. This is important for passenger ships with watertight doors (WTDs) often fitted in the bulkheads. Awareness of the ship flooding risk due to open WTDs and the conditions under which the associated risk level changes ar...

The continuous monitoring and assessment of operational vulnerability and accident susceptibility of passenger ships is crucial from the perspective of ship and passenger safety. Despite the existing solutions for vulnerability monitoring, stemming mainly from watertight door operations, a comprehensive framework for accident susceptibility assessm...

We present a novel convex optimisation model for ship speed profile optimisation under varying environmental conditions, with a fixed schedule for the journey. To demonstrate the efficacy of the proposed method, a combined speed profile optimisation model was developed that employed an existing dynamic programming approach, along the novel convex o...

This paper presents a big data analytics method for the evaluation of ship-ship collision risk in real operational conditions. The approach makes use of big data from Automatic Identification System (AIS) and nowcast data corresponding to time-dependent traffic situations and hydro-meteorological conditions respectively. An Avoidance Behavior-based...

Waterway traffic complexity is one of the main reasons behind grounding accidents. It can be estimated qualitatively through expert judgment or quantitatively through the analysis of traffic data. In this paper we introduce a big data analytics methodology for the analysis of grounding avoidance behavior of selected Ro-Pax ships. To demonstrate the...

A decision support system with damage stability analysis has been recognized as an important tool for passenger ships. Various software applications have been developed and taken into use over the years, without a direct link to any compelling requirement, set forth in the international regulatory framework. After the Costa Concordia accident, new...

https://authors.elsevier.com/a/1ZHDx6nh6scm2 full text available through this link (valid until Aug13, 2019). The paper provides an insight into contemporary research on ship stability and identifies the possible directions for future research by reviewing a selection of papers published in STAB 2015, ISSW 2016 & 2017. These works have been organ...

Better operational efficiency by fuel savings can be achieved by applying voyage optimization. Weather routing can improve the safety of operation. The route selection is dependent on the weather forecast, which contains uncertainty. Response of the ship and vulnerability to dynamic stability failures in certain sea conditions can be very different...

This paper describes a process for analyzing deviations and trends of ship performance by combining open data-baseddanalyticsstoocustomer'ssproprietaryydata..Mitsui O.S.K. Line (MOL), as all commercial operators, has collected departure, noon and arrival reports from all the ships in their fleet. There is a massive volume of data. But it also requi...

Current technology in weather and environment, monitoring combined with the open AIS information available for tracking ships in service has opened possibilities for estimating the real environmental history of a ship experienced during her lifetime. When this big data is processed with advanced analyses and combined with the digital twin of a real...

The paper analyses the state-of-the-art and future perspectives by reviewing a selection of papers published in STAB2015, ISSW2016 & 2017. These works have been organized in different sections, according to the main thematic areas of research, covering intact and damage stability, regulatory issues including probabilistic approaches, advanced numer...

Definition of the ship main dimensions at the contract design phase plays an important role on the profitability of the ship project. Cargo carrying capacity and design speed are fixed at this stage. Power requirement is then estimated and an allowance to weather margin and hull fouling is reserved. Clean hull resistance in calm sea conditions can...

The current damage stability criteria for ships are mainly based on the characteristics of the righting lever curve. The related calculations for different intermediate stages during the flooding process, and for the final equilibrium condition, are generally considered trivial. However, with the increased computing capacity the regulations are dev...

https://www.onepetro.org/conference-paper/ISOPE-I-17-297?sort=&start=0&q=manderbacka&from_year=&peer_reviewed=on&published_between=&fromSearchResults=true&to_year=&rows=10# A new method and implementation of ship motion computation is described. An existing zero speed method is extended for forward speed calculations by using same kind of speed co...

A decision support system for passenger ships in flooding casualty has been recognized as an important tool on modern cruise ships. There are several applications already at the market and in the use, some of which have been developed during the years without a direct link to any compelling requirement set forth in the international rule framework....

Stricter requirements imposed on ships through emission control areas (ECA) can be fulfilled by using LNG as fuel. Low flashpoint fluids onboard have raised some concerns with respect to the safety level, especially on passenger vessels. In addition, recently revised SO-LAS regulations pose more stringent requirements to the survivability of ships...

full text available for free until March 25, 2016: http://authors.elsevier.com/a/1SUbE6nh6g0TM In the present paper, 2D numerical simulation of sloshing waves coupled to the flooding flow between two compartments is carried out employing lumped mass and Lagrangian methods. The first method used is a Lumped Mass method with a moving free surface (L...

full-text available until July 15, 2016: http://authors.elsevier.com/a/1T6FR6nh6g0Ya Dynamics of an abrupt flooding case are studied by comparing fully dynamic and quasi-static flooding simulation methods. Transient asymmetric flooding is traditionally modelled by dividing the compartment into smaller parts with bulkheads representing different ob...

Roll decay of a ship in flooded condition was studied experimentally and numerically. Two different flooded compartment layouts were used. Floodwater motions in the compartments were simulated numerically by applying lumped mass with a moving free surface method. Water exchange through the non-watertight bulkheads in compartment was modeled by appl...

http://www.sciencedirect.com/science/article/pii/S0889974615001310 Numerical non-linear time domain simulation method for damaged ship motions is presented. Floodwater motion modelling is based on the lumped mass method with a moving free surface. The ship and floodwater motions are fully coupled. The variation of the floodwater mass is accounted...

http://www.sciencedirect.com/science/article/pii/S0889974615001322 Coupling of the flooded water and ship motions was studied experimentally. Roll decay tests for one flooded compartment and transient abrupt flooding tests were performed for the box shaped barge model. The tests were conducted to obtain information on the flooding process for the...

http://www.sciencedirect.com/science/article/pii/S0029801814001346 The dynamic forces that the flooded water exerts to a ship are of interest in terms of damaged ship survivability. The dynamic force of the flooded water is generated by sloshing and flow from one compartment to the other. The purpose of the tests reported in this paper is to study...

http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1912036 Two different methods, pendulum model and computational fluid dynamics (CFD), to predict the forces on the ship caused by the flooded water are compared against the model test results. Calculations were performed for a tank in forced motions at different frequencie...

Model tests to generate validation data for the codes predicting the sloshing and progression of water through an opening in case of a damaged ship were planned and performed. Behaviour of the flooding water after the damage is greatly dependent on the internal compartment geometries and vessel motions. Vessels angular position and motions in turn...