Ship Trim Optimization Software | Fuel and Power Saving

The Ship Trim Optimization Software determines the optimum operating trim for different vessel drafts, displacements and speeds. It combines towing-tank data, CFD, resistance prediction, propulsion analysis and propeller hydrodynamic performance calculations. Trim optimization requires no modification to the vessel and no additional equipment to be installed on board. Fuel savings are achieved simply by determining and maintaining the optimum trim for each loading condition. It really is that simple! :-) :-)

For every combination of displacement and draft, there is an optimum trim condition at which the vessel requires minimum engine power to maintain a given speed. On suitably equipped vessels, the optimum trim can also be continuously assessed and adjusted throughout the voyage.

Based on our experience gained from fleet-wide trim-optimization studies covering vessels ranging from 4,500 to 120,000 DWT, reductions of approximately 5-10% in required engine power may be achieved, depending on the vessel type and loading condition.

Smaller vessels typically achieve reductions of approximately 4-7%, while the potential benefit is generally more limited for Capesize vessels.

Detailed information and a demonstration version of the trim-optimization software are available here.

Resolution MEPC.395(82), 2024 Guidelines for the Development of a Ship Energy Efficiency Management Plan (SEEMP), recognizes optimum trim as an important operational energy-efficiency measure. Paragraph 5.3.1 states that trim has a significant influence on ship resistance and that optimizing trim can deliver significant fuel savings. By reducing the engine power and fuel required for a given operating condition, trim optimization can also reduce CO₂ emissions and improve the ship's operational Carbon Intensity Indicator (CII).

Ayrıca, Trim Optimizasyonunun EEDI/EEXI/CII arasındaki ilişki aşağıdaki şekilde ozetlenebilir.

IMO 'nun GreenVoyage2050 acıklamasında EEDI/EEXI 'nin geminin tasarım parametrelerini hedeflediği ve normal olarak geminin omru boyunca bir kez doğrulandığı acikca belirtiliyor. CII ise gercek yıllık operasyonel performansı veriyor. IMO GreenVoyage2050 enerji verimliliği portalı

IMO 'ya sunulmuş MEPC 80/INF.10 Calışmasında EEDI, EEXI ve CII gibi duzenlemelerin enerji verimliliği teknolojilerini teşvik ettiği belirtiliyor; ballast and trim optimisation” olgunlaşmış teknolojiler arasında sayılıyor. Ancak belge, trim optimizasyonunun sertifikalı EEDI veya EEXI değerini doğrudan degistirebilecegini soylemiyor. MEPC 80/INF.10, sayfa 18

Yeni geminin tasarım aşamasında optimum trim koşulları govde formu ve hız-guc performansına dahil edilirse, daha iyi doğrulanmış hız-guc sonucları uzerinden attained EEDI 'a katkı sağlayabilir. Benzer şekilde, mevcut gemide kalıcı ve doğrulanmış teknik bir değişiklik yapılırsa EEXI Teknik Dosyası uzerinde etkisi değerlendirilebilir. Fakat, onerdigimiz mevcut onboard yazılımla yapılan anlik trim optimizasyonu icin doğru iddia CII ve operasyonel karbon yoğunluğunun iyileştirilmesidir.

Trim Optimizasyonu ile Igili Yaptigimiz Yayin ve Seminerler

HOW DOES SHIP TRIM OPTIMIZATION WORK?

HOW DOES THE TRIM OPTIMIZATION MODEL WORK?

The Trim Optimization Model presented on this website is an energy- and fuel-saving solution developed for vessels already in service.

For each loading condition and operating speed, it determines the optimum trim at which the required engine power and fuel consumption are minimized.

The model is supported by onboard software that assists the master and bridge team in selecting the most efficient trim condition for the vessel’s loading condition and operating speed.

DATA REQUIRED FOR TRIM-OPTIMIZATION ANALYSIS
The following drawings, reports and technical information are generally required:
1. A two-dimensional lines plan or three-dimensional hull geometry
2. The towing-tank test report. If no suitable test report is available, the CFD might be necessary.
3. Propeller geometry and principal propeller particulars
4. Technical information about the main propulsion system, including the main engine, reduction-gear ratio, shaft generator and other relevant equipment
5. Recent voyage reports covering the vessel 's full range of operating drafts and loading conditions

TRIM OPTIMIZATION SOFTWARE BUNDLE

The Trim Optimization Model consists of a suite of proprietary software developed entirely in-house.

The computational programs are written in Excel background Visual Basic and Fortran.

The final onboard application is Microsoft Excel-based, with Visual Basic for Applications (VBA) macros running in the background.

This provides the ship's personnel with a practical and user-friendly interface for determining the optimum trim condition.

RESISTANCE AND PROPULSION ANALYSES

The resistance analysis is based on the Holtrop and Mennen method. However, the wave-resistance and hull-roughness allowance formulations are calibrated using the measured results provided in the towing-tank test report. This calibration enables reliable resistance predictions to be made for trim conditions that were not covered by the original model tests.

A similar procedure is applied to the quasi-propulsive coefficients. Although the Holtrop and Mennen method provides reliable initial estimates of these coefficients, correction factors are derived by comparing the calculated values with the available towing-tank test or detailed CFD results. These correction factors are then interpolated to estimate the quasi-propulsive coefficients for trim conditions not included in the towing-tank test report.

The calculations at this stage are performed using an in-house Fortran-based computational program without a graphical user interface. The results generated during this phase serve as input data for the next stage of the trim-optimization process.

PROPELLER HYDRODYNAMIC PERFORMANCE ANALYSIS

The evaluation of propeller hydrodynamics, particularly propeller open-water characteristics, is an indispensable part of the Trim Optimization Model. Propulsion analysis and the reliable prediction of required engine power cannot be performed without accurate propeller open-water performance data.

Propeller open-water characteristics are calculated using well-established in-house computational tools. The principal numerical approaches used for this purpose include lifting-line methods, lifting-surface methods and panel methods. Commercial Computational Fluid Dynamics (CFD) software may also be used when appropriate.

However, all these methods require the careful selection of modelling assumptions, correction factors and computational parameters. Being familiar with propeller-design software or operating a modern commercial CFD package is not, by itself, sufficient to ensure reliable results. A thorough understanding of propeller hydrodynamics, wake flow and cavitation behaviour is essential.

Such expertise is developed through extensive practical experience in cavitation tunnels, towing tanks and propeller-design organisations. Without this combination of theoretical knowledge and practical experience, propeller-performance predictions may be significantly inaccurate.

Three-dimensional model of a 6.3 metre bulk carrier propeller

The 3D representation of the propeller whose diameter is 6.3 meters working in 90K DWT BC.

Panel method representation of a ship propeller

The panel method representation of the same propeller given above.

Propeller open-water thrust coefficient comparison

The Kt-Thrust coefficient of the same propeller. As it was seen in the picture different algorithms give different results. Choosing the correct value is an expertise type of job. In that example the output from the lifting surface algorithm (Curve Kt-LSM) has been preferred.

All software's used in this phase are Fortran programming language based. The output file of this part will be that data of the next.

SHIP TRIM OPTIMIZATION EXCEL SOFTWARE INTERFACE

Ship trim optimization Excel software interface

Download the Ship Trim Optimization Software Demo - 57,000 DWT Bulk Carrier - Excel Macro

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Ship Trim Optimization Software for Fuel and Power Saving