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The latter stages of a vessel’s life will inevitably lead to some form of disposal and with ever more stringent legislation in this area, due consideration should be given at the design stage. Whilst the central part of the top hat is non-structural, structural PVC core is applied to the sides and top to provide buckling support to the web laminates, and it was crucial to identify areas where the adhesive was no longer attached.

#SLIPWAYS DOWNLOAD SKIN#

In one particular case of damage to a lifeboat, ultrasound was identified as being able to locate areas through the glass/epoxy single skin hull shell where the longitudinal top hat stiffeners were not attached. Typical NDE methods used by the RNLI include shearography, ultrasonics and thermography. This is usually followed up by an inspection of the repair as described in Sheppard et al.

Non destructive evaluation methods are utilised during the build process and also to assist in establishing the extent of any areas of damage that may be sustained in service. One example of this is reported in Lawrence and Austen, (2008), where the authors describe the methodology to assess the production defects identified during build and the repairs carried out to rectify them. A similar approach may also be taken by the RNLI to assess production difficulties or damage where by a local FEA model including discontinuities is built to quantify the effects and appropriate repair method. By optimising material and geometric parameters and/or by generating local FEA models, these analyses can then be utilised to determine the composite lay up and fillet sizes of the structural adhesive required. The global FEA model can be used to establish the percentage fixity of a joint better and quantify shear loads and bending moments of individual stiffeners and frames.

Due to the complex nature of adhesive joints, this is a frequent approach taken and is well reported in the literature ( Shenoi and Hawkins, 1992 Lawrence and Austen, 2008). To aid the design process, it may also be appropriate to carry out finite element analysis (FEA) to support empirical design calculations. Owing to the tight tolerances involved at the boat to slipway interface, it was concluded that the stiffer joint would be the most appropriate whilst accepting that the joint would attract higher stresses. Whilst the maximum failure load for the two adhesive types was about the same, unsurprisingly there was more movement of the joint during the test. The benefit utilising a more compliant structural adhesive in this joint was quantified during a cantilever load test when compared with the typical adhesive used elsewhere on the vessel. The function of the bilge keels in this case varies from that of the other classes in that the keels need to be sacrificial when the boat is at sea but maintain their integrity during slipway operations. There was good operational and through-life experience of bilge keels on the Severn and Trent classes to help protect the rudders and propellers, but with these two classes being afloat boats, additional knowledge was required during the development of the Tamar class as this is a slipway launch lifeboat. One example where further testing was carried out was in the case of the Tamar class bilge keels as shown in Fig. 3.6. In experiments, we design some challenging scenes as from the tracking point of view, such as camera movement and optical zoom, high speed and agility of satellite, satellite pose variation in pitch, yaw and roll, occlusions due to our preset strong light spot, specular reflections from the satellite surface and solar array, and background clutter caused by bright stars.ĭepending on the familiarity and importance of a particular adhesive joint, the RNLI also assesses the need to carry out further evaluation to support the design calculations. We designed a curve approach experiment to test our algorithm. Lights systems, background simulation, and any other environmental factors can also be separately or jointly controlled. The 6 DOF can be controlled separately or jointly by PEWIN32RO installed in PC, including their amplitudes, velocity, and acceleration.

We have a 6 DOF motion platform composed of a 2 DOF slipway, 2 DOF (pitch and yaw) revolving table, and 2 DOF lifting and roll platforms. A Chang'e-IIsatellite model is used, the main body of which is a 70 × 70 × 60 mm 3 cube.

We designed several semiphysical experiments to simulate the real scene in our lab, as shown in Fig. Fan Zhang, in Tethered Space Robot, 2018 3.4.6.2 Design of Experiments

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