Marine Link
Tuesday, October 16, 2018

Maritime Research Institute Netherlands News

New Study to Provide Insight into Passenger Ship Comfort

Rob Grin

Comfort is considered to be a crucial factor on board passenger ships as it largely determines passenger satisfaction, on board expenditure and passenger return levels. However, comfort is subjective as people are very different. Where one passenger complains about discomfort, the other may hardly notice anything. Passenger comfort is determined by a large variety of factors including the interior design of public spaces, temperature and smell. However, within the context of MARIN’s services, we will limit ourselves to the hydrodynamic aspects that might influence comfort.

Using AIS Data to Assess Collision Risks

Automatic Identification System (AIS) data is now being used to determine the collision risk for offshore installations. MARIN helps oil companies with risk assessments for offshore installations by calculating the probability of a ship collision with the offshore installation. For these calculations, the traffic around the installation can now be modelled using AIS data. In this way, the traffic situation is realistically represented. The Safety Assessment Model for Shipping on the North Sea (SAMSON) has been used and developed for more than 25 years.

Floating Wind Power: A Semisubmersible Floating Turbine Foundation

Floating foundations for wind turbines present some technical advantages, which is encouraging more and more industry players to develop new floaters. Firstly, they can be deployed in deep seas, independent of the soil conditions. Secondly, the installation and heavy maintenance can be done in sheltered areas, so that the whole OFWT can be towed directly to the wind farm’s location by conventional tugs. However, floating foundations also bring new constraints on the wind turbine due to their motions in waves and wind.

Naval Design: The Human Role

(Photo: MARIN)

Many navy new building projects face a double challenge; the variety and complexity of operations are increasing, while at the same time, a reduction in manning is a prerequisite in order to lower building and operational costs. Therefore, it is important to identify the required number and type of crew and the supporting systems in the concept phase. For a long time the use of weapons and platform systems have relied on a high degree of integrated, multi-sensor data processing and decision support systems.

ReFRESCO-Operation Unique Opportunities in CFD

Henk Prins

CFD plays an increasingly important role in the design of maritime and offshore structures. MARIN has always supported this with dedicated tool development, extensive validation and application. Naval architects and offshore engineers increasingly use CFD calculations themselves or plan to do so in the near future. To stimulate cooperation and interaction in this field, MARIN now invites its clients to take part in the ReFRESCO-operation. In this partnership, MARIN wants to share its dedicated CFD Code ReFRESCO, which is extensively verified and validated for maritime applications.

IRClass Offers EEDI Validation Service

Photo: IRClass

IRClass (Indian Register of Shipping) has recently included Energy Efficiency Design Index (EEDI) validation to its service offerings. This is in response to the International Maritime Organization’s (IMO) adoption of the EEDI regulation on January 1, 2013 which will apply to the majority of vessels delivered on or after July 1, 2015. Under the regulation, the EEDI value calculated for a vessel must be based on speed in ideal sea conditions. However, often such conditions are not practically achievable due to time and geographical constraints.

Bilge Keel Damping from In-field Motion Measurements

Chevron and MARIN worked together on a novel approach to characterize the actual damping for an FSPO in real world conditions. Results show that using damping from model tests means that roll decay in calm water is conservative and that natural roll periods are less sensitive to the FPSO draft than often considered in the design phase. Due to the resonance behavior of roll motions, roll damping is an important consideration for vessel motions and the associated extreme and fatigue loading on the hull, topsides and risers of an FPSO.

Marine Hazards to Subsea Cables and Pipelines

(Image: MARIN)

In February 1989 the RoRo vessel Vinca Gorthon ran into heavy weather and sank off the Dutch coast. She landed on an oil pipeline that was severely damaged. Although the probability of sinking on top of a pipeline is very small, the incident showed that it can happen. Shipping traffic can represent a potential hazard to subsea pipelines in various ways, such as sinking or grounding, lost containers or an anchor hooking onto a pipeline. Over the years MARIN has contributed to the…

“FS3” Motion-based Simulator for Dutch Navy

A two-year project is underway which will lead to the development of a Fast Small Ship Simulator. Driving a small, fast navy boat in heavy seas can be a real challenge. Effects of broaching, surfing, capsizing risk, slamming and planing put severe demands on the crew and the boat handling. It requires a well developed  skill-set to safely navigate  under various operational  circumstances. With these challenges in mind, a two-year project has just started  to develop a dedicated  training tool, which is currently known as the Fast Small Ship Simulator (FSSS) or FS3.

Fratelli Neri Orders Damen Tug

Damen's ASD 3212 Tug

One of the largest Italian tug owners, Fratelli Neri S.p.A, ordered its first Damen tug, an ASD 3212, on 21 July 2015. The vessel will be the first ASD tug in the Mediterranean region with a Damen Render Recovery Escort winch. The family-owned, Livorno-based harbour towage company has been in operation for over 100 years. Besides this new tug, the company has ordered two additional second-hand Stan tugs 2608 from Damen Trading. “Damen’s well-known high quality construction and reliability, as well as fast delivery times, were the main reasons behind our decision to place this order.

The Nautical Safety Profile

(Image: MARIN)

MARIN is working together with the industry to develop the Nautical Safety Profile for operations and risk management. Liquefied natural gas (LNG) is increasingly being used as an alternative fuel, both at sea and on land, to reduce pollution from transportation. In 2011 the first LNG carrier arrived at the Rotterdam Gate terminal, and last year the terminal was upgraded to facilitate the transfer of LNG to shuttle tankers. An extensive safety analysis was carried out prior to the development of the terminal and a dedicated harbor access policy has been defined.

Passage to the High North – When Spray Matters

Albert Aalbers

Why bother about a bit of spray? In mild climate latitudes rain and spray water is hardly a concern; it will run off and the ship happily carries on. But going to the High North it’s different. With the economic development of the High North and Arctic areas, partly driven by the reduced ice conditions and partly by opportunities to develop oil and gas and scarce mineral resources, maritime operations in these areas are booming. But safety of the environment, crew and their ships is of prime concern. In the Arctic, global warming doesn’t mean milder conditions.

Supporting Silent Ships

(Photo: MARIN)

Have you ever had problems talking to someone in a noisy environment such as a busy restaurant? The same happens to marine animals, which use sound to sense and interact with their environment: for communication, navigation, finding prey and even for self-defence. High ambient noise levels, which include a contribution from shipping, have an adverse impact on marine life. The world’s oceans are becoming increasingly noisy. While the size of the global commercial fleet more than doubled since the 1960s, anthropogenic noise in the oceans has actually increased eightfold.

Eye on Design: C-DRONE

(Image: MARIN)

During trials the correct measurement of metocean conditions is crucial for reproducibility, performance prediction and to avoid disputes between different stakeholders. MARIN believes its new C-DRONE can make it much easier to obtain accurate measurement data. MARIN has several systems in use to measure wave height and period. The most direct and accurate way to measure the wave characteristics is the use of a wave buoy. Yet, a buoy is rarely requested during trials because the retrieval process requires a separate support boat that can easily manoeuvre and pick up the buoy.

Navigation Simulation Suite Opens at Port of Milford Haven

The Port of Milford Haven’s Marine Navigation Suite (Photo: MARIN)

Safe navigation is a priority operating principle for the UK’s largest energy Port, the Port of Milford Haven. And earlier this week the Port demonstrated that commitment with the unveiling of its new, state of the art marine navigation simulator. Significant investment has been made in developing this new facility, and it is an exceptional tool. Built using MARIN’s latest software, DOLPHIN, the navigation suite is positioned to lead the market in training and exercise scenarios.

C-Job Designs Wind-assisted Flettner Freighter

Photo:C-Job

C-Job Naval Architects has delivered the design for a wind-assisted general cargo vessel to Dutch shipping company Switijnk Shipping. The 8,500 DWT vessel will be equipped with two Norsepower Rotor Sails that will supplement the main engines and is expected to achieve fuel savings of approximately 14 per cent. C-Job was approached by Switijnk Shipping following its involvement in the European Union Interreg project S@IL, for which C-Job developed the earlier design of a 4,500 DWT Flettner Freighter. C-Job designed this smaller vessel with four Rotor Sails.

Measuring Noise Levels of Cavitating Propellers

Figure 1: Cavitation pattern on the propeller of the research catamaran

As underwater radiated noise levels in the oceans increases, MARIN has investigated just how much cavitating propellers are to blame. Traditionally, underwater radiated noise is mainly of interest for naval vessels and fishery research ships. Nowadays, however, there is a growing concern that marine life is affected by the rise in background noise levels in the oceans. Marine mammals and fish use sound to communicate and to sense their environment and this requires low background noise levels. The rise in noise levels is being caused by an increase in shipping, among other factors.

Lifetime Assessment for Deepwater Moorings

Photo: SBM Offshore

Mooring integrity is an important concern in the offshore industry [1]. Mooring leg failures can have  significant consequences, such as temporary shutdowns and require unplanned, thus expensive, repairs. On the other hand, an over dimensioned design leads to higher loads acting on the floating facilities and a large investment. Meanwhile, the development of deepwater projects has led to the discovery of the new fatigue mechanism of ‘Out of Plane Bending’ [2]. This means that the design of moorings requires more detailed analysis to ensure the integrity of the mooring system.

Complex Hull Shapes Need Sophisticated Assessment

Van Oord asked MARIN to perform a full assessment of the hull lines of its new hopper dredger. Twin gondola aft bodies have been successfully applied to hopper dredgers for many years. This is usually combined with a tunnel head box combination above the propeller. The tunnel leads the water to the propeller, while the head box supports the nozzle and the rudder. However, this results in a very complex shape and consequently, complex flow characteristics. On top of that the operation profile of a hopper dredger is also challenging; sailing in deep and shallow water at two completely different drafts i.e. fully laden and empty. The question arises about how to keep the flow under control in all these conditions.

FPSOs Require Special Monitoring to Support IMR

Remco Hageman

MARIN has used measurements from one of the Advisory Hull Monitoring Systems for FPSOs to improve inspection schedule planning and to support operators in making maintenance decisions. Maintenance is essential for operators of high performance craft and offshore units and relevant and up-to-date information is required to make well-informed decisions. As an FPSO does not enter drydock for regular inspections in-field maintenance is very important. On the other hand, inspection and maintenance is expensive because it requires a partial interruption of production…

Ship Design: Monitoring and Analysis for Emissions Reduction

Example of vessel whereby the amount of cargo carried is difficult to quantify in single MRV indicator. (Picture courtesy of Spliethoff)

In April 2015, the European Union adopted a mandatory Monitoring, Reporting and Verification (MRV) regulation for CO2 emissions resulting from maritime transport. The MRV requires operators of large ships to monitor and annually report the verified amount of CO2 emitted on journeys to, from and between EU ports. Using basic input data (distance, fuel, time, cargo weight) and indicators the ship’s performance is determined and reported publicly. Over the past two years MARIN has…

When Using CFD Simulations, an Analysis of Anti-Roll Tanks (ARTS)

Maarten Kerkvliet

In 2014, the behavior of anti-roll tanks was studied at MARIN by using ReFRESCO CFD simulations to fully understand the working principles. In 2014, the behavior of anti-roll tanks (ARTs) was studied at MARIN by using ReFRESCO CFD simulations to fully understand the working principles. The roll motion of ships operating in a seaway often limits operations. These limits could be due to the maximum acceleration, green water, capsize risk or just comfort, for example. Therefore, additional roll damping is often desired to improve the operability of ships.

Van der Velden Marine Systems: Innovating Efficiency

Photo: Damen

After celebrating its 50th anniversary in 2013, Van der Velden Marine Systems, a daughter company of the Damen Group, is not resting on its laurels as the Netherlands-based company’s R&D department works to continue advancing maritime maneuvering and propulsion efficiency. “We are currently building a 97m2 Energy Saving Package (ESPAC) system for a series of three 18,000 TEU vessels being built for CMA CGM at the CSSC-affiliated Shanghai Waigaoqiao Shipyard in China,” said Edwin van Buren, Director R&D at Van der Velden Marine Systems.

Maritime Reporter Magazine Cover Oct 2018 - Marine Design Annual

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