HMS
Hull Monitoring System

Measure, Monitor and Avoid...Bow Emergence, Slam, and Excessive Hull Flexure With Real-Time Graphic Displays, Charts, Tables and Reports

Increase Vessel Operating Safety While Reducing Structural Damage
HMS is an intrinsically safe system that displays quantitative data about ship motion in intuitively clear graphic and tabular formats. At sea, deck officers navigate more efficiently, minimizing structural damage. On land, post-processing re-creates any voyage, quantifies its slams and stresses, looks for correlations, evaluates fatigue damage and helps operators plan safer routes.

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Real-Time Displays Help Cut Structural Repair Costs
Ship owners' cost and frequency of repairs are a direct result of metal fatigue caused by hull stresses, bow slamming and vibration. HMS continuously informs wheelhouse watch personnel of deck stresses, bow pressure and accelerations. The system sounds alarms as critical limits are approached; even shows the effectiveness of the ship's latest maneuvers. Displays include:

Operating Status: Animated and real-time displays for: wind and wave velocities, pitch, roll, accelerations, bow pressure, deck stress, course, speed, and slam probability.
Real-Time Status: Continuous 60-second time-history plot for any two data channels.
GPS Status: Ship's position traced against a route map with UTC noon marks.
Power Consumption: Displays the ship's real-time power consumption. This allows officers to see how changes in course and speed affect fuel economy.
Historical Status: Four-hour time-history bar chart indicating five-minute average and maximum value for: pitch, roll, deck stress, bow acceleration and pressure.
Terminal Status: Displays tide and current information for port. Also displays wind direction.


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Post-Voyage Reports Help Optimize Operating Procedures
Data analyses enhance deck officers' understanding of the ship's dynamic behavior under various loading conditions, and what to expect by season and route. Having this information allows operators to optimize at-sea procedures for safety and structural integrity by answering questions such as:

  • What was the maximum roll, pitch angle etc. encountered last winter?
  • Which routes are structurally critical in which seasons?
  • What is the current rate of fatigue damage for various struct ural components?
  • What is the probability of structural damage given the number of bow emergences since the last shipyard period?
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Flexible Component Installation
In one day, the minimum HMS configuration can be installed and activated with wireless, radio-linked data transmission to the deck-house. Alternatively, the entire system can be installed during an appropriate shipyard period.

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hms5 Standard Equipment Includes:
  • Intel-based Command Center
  • 16 or 32 data acquisition channels with 10Hz polling
  • Bow accelerometer to measure vertical motion
  • Bow bottom pressure transducer to measure emergence and slam
  • Mid-deck strain gauges to measure stress
  • Inclinometers to measure pitch and roll
  • Utilizes ship's engine, anemometer and GPS data


Client List:
  • Marathon Oil
  • Polar Tankers
  • Alaska Tanker Company