Get the Best Hull Stress Monitoring UAE From Linkmarine

Explore the read about the hull stress monitoring system (HSMS) and the various technologies to measure it.

Hull stress Monitoring System

Hull stress monitoring system (HSMS) provides real-time information to the officers and masters on the ship about the motions and global stress experiences while navigating and during loading and unloading operations. The HSMS is an aid to the master. It doesn't replace his own responsibility or judgment.

The HSMS includes various sensors, such as rosette gauges, long-base strain gauges, and trio-axial accelerometers to monitor hull girder deck stresses and localised stresses on side shell, cross-deck strip, bulkheads, and double bottom structure. Real-time data from these sensors are provided for urgent use and for the evaluation of the course and speed changes.

Various Technologies To Measure Hull Stresses In Ships

As a result, it's essential to collect a huge set of statistical data from which we may create empirical relationships that can directly anticipate a ship's hull stresses for a particular sea state and route. Let's have a look at the various technologies that would allow us to collect this essential information:

Motion Based Stress Monitoring

Focused on racking strains caused by roll/sway motions in ships. During the cruise, real-time motion data are taken and compared to the projected response using finite element analysis. The results are often in good agreement with the derived measures. Several operations and decision-making during the cruise might be aided by this strategy. It also works well with the iterative design method.

Fatigue Damage Sensors (FDS)

Used to calculate the fatigue life of ship structural members subjected to wave loads and other types of maritime loading. These are typically used in conjunction with strain gauges because they are comparable in size and integration. The sensor reacts to the strains in a structure, which causes it to crack. The fatigue life is proportional to the length of the crack. This technology is currently being tested for accuracy by comparing it to traditional tiredness evaluation methods.

Strain Gauges

The earliest technology for measuring hull stresses is the strain gauge. These make use of calibrated devices that translate the force imposed on the sample into strain.

Foil (electro-resistive) strain gauges are the most prevalent, while new technology is available now that can sometimes provide superior accuracy. In terms of applicability, they can be classified as follows:

• Short baseline (for samples less than 1 inch long)
• Long baseline ( for 2m long samples along the sample stress axis)
• Location-based (e.g., hull girder bending moment/stress utilising motion sensing)
• The new technological advancement has yet to be commercialised.

Short baseline gauges are ideal for measuring shear stresses because of their low cost and ability to fit into small spaces (about 14 th of an inch). They're perfect for reducing stress in 'hotspots.' Because of their low voltages, the gauge matrix is safe to use in explosive environments. Directional accuracy and temperature errors are also disadvantages.

On commercial ships, long baseline gauges are employed to assess hull girder stress. Their operation's relative precision is determined by how closely they resemble uniaxial elements. They can't be subjected to secondary stressors because of this (stresses arising as a result of internal adjustments in strain and not because of loading). Potentiometers (cheap, limited life), transformers (longer life), or transducers are used in these devices (larger life, expensive).

Motion sensors are used in conjunction with determined response characteristics to calculate derived moment and stress. These are distinctive to a particular location, yet they do not meet the rules of several classification groups.

Fibre optics, acoustic, radio, and LASERs are just a few examples of new technology that are now being used onboard ships for stress monitoring.

Laser/RADAR Ranging

The application of these to ship hull structures has its own set of benefits and drawbacks. If used, shorter wavelengths with higher accuracy would be required, which would come at a cost in terms of both price and power consumption. When operated at short wavelengths, these are prone to mistakes caused by environmental variables such as atmospheric moisture.

Fibre Optic

Fibre optic strain gauges had been advanced and deployed, they may be less expensive however the price in their coupling is pretty excessive and beyond the present day expenditure trends. Their reliability is likewise a large concern. But, they will simply increase a spot in military applications, low weight, and explosive environments, etc.

Acoustic

Acoustic strain gauges can function without the need for direct contact. These have typically been used for bridges, but they may one day be expanded to ships. The ability to penetrate paint, rust, and other surface impediments is one of the advantages. They must, however, be economically viable for onboard use in addition to calibration.

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