By Carlos Guedes Soares; International Conference on Marine Structures
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Additional resources for Advances in marine structures : proceedings of the 3. International Conference on Marine Structures - MARSTRUCT 2011, Hamburg, Germany, 28 - 30 March 2011
Stress ratio σxx / σVMmax, quarter position. Description of the algorithm for the software onboard During the setup phase, each sensor is to be uniquely identified and correlated to a panel/ stiffener position, and also to the side of the hull it is placed on (port or starboard). When setting up the system, the user has to specify geometric and material details as the panel’s aspect ratio and the sensor’s position (“middle” or “quarter”, for panel sensors only), the material Modulus of Elasticity, Poisson’s ratio and thermal expansion coefficient, and also the maximum permissible stress values for each panel/stiffener.
It is believed that the finite element idealizations used in the modeling are adequate to obtain the dynamic response behavior of the bulk carriers in vertical bending and coupled horizontal bending and torsion. Figure 1 shows the finite element idealization of the 32 000 dwt bulk carrier. The surrounding fluid domain is discretized by using three dimensional acoustic fluid finite elements available in the commercial software. The calculations are carried out for the fully loaded and ballast conditions.
Small strain gauges (of about 2 cm of length) appear hence to be the preferable solution for most of these hot spots, even if sensors up to 10 cm, if installed properly, can be generally employed, providing equally useful information on local stresses. For the hatch corners, stress distributions seem to allow the employment of strain gauges with a length between 10 and 20 cm. indb 23 2/18/2011 5:39:56 PM Subsequently, the monitoring software calculates vertical and horizontal bending moments (MV and MH) applied to each cross-section as follows: 4 MV ∑ KV iσ i (1) ∑ K H iσ i (2) i =1 4 MH i =1 where σi represents the compensated stress measured by the i-th sensor and KV and KH are coefficients depending on the characteristic of the cross-section and on the position of the sensor in the section.