News

MMC Wins MSC's 2017 Simulating Reality Contest

October, 2017 (Portland --) Maine Marine Composites (MMC) has won MSC Software's annual Simulating... READ MORE

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Opening Date Announced for Queensferry Crossing Bridge

August, 2017 (Scotland --)  The Queensferry Crossing Bridge, spanning the Firth of Forth in... READ MORE

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Portland Tidal Power Firm Awarded Federal Grants

August, 2016 (Portland --) Maine Marine Composites will assist Ocean Renewable Power Company (ORPC)... READ MORE

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Maine Company Announced as Finalist for Wave Energy Prize

August, 2016 (Portland --) Maine Marine Composites (MMC) has completed an extensive analysis... READ MORE

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Maine Marine Composites Completes Research Study on Offshore Wind Turbines

September, 2015 (Portland --) Maine Marine Composites has completed a government funded study of... READ MORE

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MMC gives webinar on issues with mooring systems

Richard Akers, CTO of Maine Marine Composites, gave a webinar... READ MORE

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Maine Marine Composites Wins Federal Grant to Study Ocean Turbine Stress Limits

Jan 14, 2014 ( Portland-- )  Maine Marine Composites has been awarded... READ MORE

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MMC Completes Analyses for Waller Marine, Inc.

October 9, 2012 (Portland --) Maine Marine Composites, LLC (MMC) announced successful... READ MORE

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Maine Marine Composites Presents at IBEX 2012

Richard Akers, CTO of Maine Marine Composites, gave a presentation on "Advanced Analysis for... READ MORE

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Maine Marine Composites Completes Hydrodynamics Analysis for Ocean Renewable Power Company

(Portland --) Maine Marine Composites, LLC (MMC) announced successful completion of a hydrodynamics... READ MORE

Analyzing High-speed, Lightweight, Mission-Versatile Patrol Boats

It's not easy to design a high performance boat. Engineers need tools for composite structural design, and to manage and mitigate injurious shock and vibration. Maine Marine Composites has developed one of the few simulator programs available for high-speed planing craft.

MMC's POWERSEA program has been used in a number of new-design projects, including the SOCOM Combatant Craft Medium Mk 1 project. MMC recently entered into a contract with the Office of Naval Research (ONR) to enhance and extend the program to improve its accuracy and range.

POWERSEA predicts the motion of a planing boat in calm water, regular or irregular seas. You specify the forward velocity or thrust and the shape of the waves or wave spectrum – POWERSEA calculates the hull’s motion including surge, heave and pitch displacements, velocities and accelerations.

  • Speed/Power analyses in calm water or waves. Dynamic Response
  • Predicting heave, surge and pitch amplitude, velocity and acceleration at any point on your design.
  • Investigating porpoising (vertical oscillations) behavior.
  • Estimating dynamic natural frequencies of hull with respect to incident waves.
  • Investigating time dependent effects such as porpoising, deck wetting and boat accelerations.

POWERSEA can be controlled via OLE Automation and can be extended using external DLL models to satisfy virtually any design simulation requirement.

Time-Domain Analysis

You can specify the surge velocity or the thrust – POWERSEA predicts the corresponding thrust or velocity for you. Thrust can be specified in terms of steady or ramped force, power or velocity. In all cases POWERSEA will predict three vertical degrees of freedom: surge, heave and pitch.

POWERSEA can tell you whether the ride will be comfortable and safe. Acceleration time-data generated by POWERSEA can be used to predict the probability of damage to materials stowed on deck due to extreme accelerations. You can use the POWERSEA acceleration spectra to predict the incidence of seasickness in a given set of sea conditions.

The dynamic stability of a planing craft is a serious concern to the designer. It is much more cost effective to use a computer to predict porpoising behavior in advance than to build the boat and find out that it porpoises afterwards. POWERSEA can predict the rang of loading and operating conditions that will lead to porpoising.

Response Analysis

When you design a high-speed planing boat, one of your concerns is the dynamic stability of the vessel. Each planing hull will respond strongly to certain frequencies of encounter – you need to know that your hull-form does not have a strong negative response to waves that you are likely to encounter.

You can use the Response Analysis capability of POWERSEA to run repeated analyses at different wavelength-to-boat length ratios, finding the surge, heave, pitch and power response to each frequency. A Response Analysis is especially useful when you want to make sure that your high-speed craft does not exhibit extreme responses to waves in a given lake or river, or to commonly-encountered wakes in a particular shipping channel.

Empirical Analyses

To increase your confidence in the results of a POWERSEA analysis, POWERSEA can perform Savitsky planing and pre-planing analyses. These analyses use the same geometry data that you use for time-domain simulation, so you know you are comparing "apples to apples."