Strategic Planning With Aggregate Data

By Pekka Autere
Monday, April 21, 2014
Pekka Autere

A sensor is a device that measures some kind of input from the physical world. On complicated technical systems such as vessels, there is an enormous amount of different sensors. The number of sensors will surely grow as the size and cost of sensors continuously decrease. A person technically trained is able to gain some information from a single sensor reading, but the information is much more useful when the data from multiple sensors and sources is combined and aggregated at a higher level. At a higher level the whole vessel can be seen as a moving sensor that is collecting data from environmental conditions as well as the performance of the vessel.
Similarly as the information received from a single sensor is limited, it is inadequate to interpret the information from only a single vessel. By combining the information from several vessels, it is possible to form a higher level view of the entire fleet and compare individual vessel performance by creating benchmarks and baselines. By comparing a vessel performance to another vessel, or even hundreds of other vessels, it is much easier to evaluate if individual vessel performance is up to the mark or not. Aggregating information from several vessels can bring insight about how the environmental conditions affecting vessel fuel consumption differ between sea areas.
When planning a budget, vessel operators need to estimate the fuel costs for a selected route. Fuel costs depend not just on the voyage distance, route and the schedule, but also on the environmental conditions the vessel is going to face on the voyage. An interesting measure when estimating cost of a specific route is considering the average sea margin that will be experienced in that sea area. Sea margin refers to the energy used by the vessel to overcome the environmental and sea conditions. In ideal conditions vessel sea margin would be zero.
Average sea margins are bigger on the Atlantic and the Pacific Ocean. This is expected as the weather conditions and sea state are generally worse when compared to areas closer to the coast. Interestingly in the Mediterranean Sea, the sea margin is the lowest of all the defined sea areas. This is understandable as it’s a smaller sea area, where the waves are typically smaller and thus have less impact on a vessel’s energy consumption. In the Baltic Sea shallow water increases the average sea margin as vessel squatting has a big impact thus the average sea margin is larger.
The average sea margin does not, of course, tell the whole truth about the environmental conditions in that area; the environmental conditions vary seasonally and on some sea areas the conditions are always harsher. When we look at the sea margin distributions for the Mediterranean Sea and Pacific Ocean, we can see that in the Mediterranean Sea, the sea margin on the average is more likely to be less than 10%. The probability of the sea margin being over 20% is lesser than on the average. On the other hand in the Pacific Ocean it is the other way around. There the sea margin is likely to be higher than the average and sea margins of over 20% are more probable.  Showing the seasonal variation in the sea margin distributions would give even better insight of the changes in operating cost between different areas. When planning high level fleet deployment, the differences in energy consumptions in different areas due to sea margins should therefore be taken into account. For example operating in Mediterranean or in the Caribbean has over 2% difference in propulsion energy usage of the vessel. This is already a significant difference on fuel bill.
 The average sea margin in a certain sea area is certainly not the only way the aggregated data could be used. The information can be used to simulate the fuel consumption of an individual vessel on a certain route, giving even more accurate information for voyage planning. This kind of simulation would bring a new level of accuracy to fuel budgets. Although an individual measurement is difficult to interpret, aggregating data brings valuable insight to see the larger picture. High level of aggregated data can be of great help in making strategic decisions on how to operate the vessels better.


The Author
Pekka Autere, Lead Analyst, Eniram is part of Eniram analytics team and has broad experience in converting data into information and strategic guidance using mathematical and statistical modeling in different fields of application. At Eniram he has been working in developing statistical modeling and leading research team before moving to Analytics. He is a Master of Science in Automation and System Technology and System Analysis and a Master of Social Sciences in Economics.
w: www.eniram.fi
 

(As published in the April 2014 edition of Maritime Reporter & Engineering News - http://magazines.marinelink.com/Magazines/MaritimeReporter)

  • Figure of median sea margin in different sea areas based on Eniram benchmark data.

    Figure of median sea margin in different sea areas based on Eniram benchmark data.

Maritime Reporter August 2015 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Navigation

Automatic Camera for Monitoring Vessel Engine Developed

NYK and the Monohakobi Technology Institute  have jointly developed “Kirari NINJA” (patent pending), a device that can automatically photograph the interior of a vessel engine’s combustion chamber.

‘Chapplaincy’ for Better Seafarers' Welfare Support

Smartphone App created with support from Augustea Group and MarineTraffic will help charity deliver improved service and better measure impact of its work Sailors’ Society,

Transas Expands ECDIS Training Network in China

The New Alliance Marine Training Center (NAMTC) has joined the Transas Global ECDIS Training Network (GET-Net), and shipping companies can now benefit from an ECDIS

Environmental

U.S. Coast Guard Responds to Collision Near Paducah

On-scene assessment teams have reported the maximum estimated potential clarified slurry oil released from the tug collision is now 250,000 gallons, Thursday. The

Occurrence of Humpback Whales at Franz Josef Land Recorded

Scientists first documented occurrence of humpback whales near the archipelago of Franz Josef Land. Experts attribute this to the successful development of their populations.

China Ready with ECAs

China has taken 'important step' in tackling ship-generated emissions. China is also developing Emission Control Areas (ECAs) in its major ports.   China's Ministry

Energy

Rosneft, Gazprom to Receive Four Arctic Fields

Ministry of the Environment sent to the government documents on the transfer of "Rosneft" and "Gazprom" licenses for the development of four more fields on the Arctic shelf,

LaNaval Likely to Build Two LNG Fueled Ferries

Shipping company Baleària and Shipyard Construcciones Navales del Norte – LaNaval have reached this week an Agreement - expected to be firm in two months - for

Libya Plans to Sell Ex-rebel Tanker

Libya plans to sell a tanker that a former rebel group used in an attempt to bypass the Libyan government and export oil on its own last year, the Tripoli-based state prosecutor said on Thursday.

Marine Power

Virginia-Class Submarine Named USS Iowa

Secretary of the Navy Ray Mabus hosted a ship-naming ceremony today in Ames, Iowa to announce that SSN 797, a Virginia-class attack submarine, will bear the name USS Iowa.

CTruk Delivers Wind Farm Support Vessel

Shipbuilder CTruk Boats, a manufacturer of composite wind farm support vessels (WFSV), has delivered the second workboat in a two-craft order from CWind.   The

Rolls-Royce to Design, Equip Canadian Stern Trawler

The shipbuilding company VARD Group AS in Norway has received an order from a Canadian company for a shrimp stern trawler to be designed and equipped by Rolls-Royce,

 
 
Maritime Careers / Shipboard Positions Maritime Contracts Maritime Standards Navigation Offshore Oil Pipelines Pod Propulsion Ship Electronics Ship Simulators Winch
rss | archive | history | articles | privacy | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.4055 sec (2 req/sec)