pro the by
ojects. The benefit of a joint approach is the synergy from multidiscipline expertise by the partners. Last but not least, partici- pants can share the costs required to install equipment, sustain measurements, carry out data analysis, run comparisons and reports over many years.
Valid JIP In the Valid project, dedicated full-scale trials were carried out for a period of two years on a 118 m long US Coast Guard Cutter. Results were correlated with extensive model tests using a segmented model and with numerical simulations. The focus was on global and local stresses. Measured global deformations were extrapolated to local details using results from a Finite Element method and compared with measured hot spot stresses. In this way stress contours over the full structure could be obtained from a limited number of sensors and compared against local measurements and design calculations. A typical result from the moni- toring campaign is shown below. The figure shows a comparison of the vertical bending moments derived from measurements and calculated on the vertical and horizontal axis, respectively. The monitoring campaign furthermore showed the ship is operated in less severe wave conditions than was assumed
during design. Based on the results from the monitoring campaign, the design approach was verified and uncertainties in this approach were made explicit. This aided maintenance survey planning of the ship and design optimisation for future vessels.
TULCS The TULCS project, initiated by Bureau Veritas, focused on container shipping. Successive generations of vessels have increased their load carrying capacity from 5,000 to 9,000 and 11,000 to 18,000 TEUs. Clearly such steps put stress on design rules and new physical phenomena may become important. The research objective in the project was the modelling and validation
of the hydro-elastic response and design tools. MARIN coordinated long-term structural monitoring on board a 9,200 TEU CMA CGM container ship and used the obtained data to better understand the relevant loading mechanisms and uncertainties in the hydro-structural coupling methods used for the design of these ships.
MARIN will continue long-term monitoring projects with an extra focus on the human factor concerning the design uncertainty and to improve feedback to vessel crews for improved awareness of actual loads when it comes to capacity levels.
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