180 J. Gosliga et al. Table 17.1 List of elements and their properties for Turbine 1 Element designations for Turbine 1 Name Element ID Material Geometry Shape Rotor blade A FRP Beam Aerofoil Rotor blade B FRP Beam Aerofoil Rotor blade C FRP Beam Aerofoil Rotor hub D FRP Complex Rotor hub Nacelle E FRP Shell Cuboid Tower section 1 F Metal Beam Cylindrical Tower section 2 G Metal Beam Cylindrical Tower section 3 H Metal Beam Cylindrical Foundation I Concrete Plate Cylindrical Name Element ID Boundary – – Footing 1 Ground – – Table 17.2 List of elements and their properties for Aeroplane 1 Element designations for Aeroplane 1 Name Element ID Material Geometry Shape Fuselage A1 FRP Shell Truncated cone Fuselage A2 FRP Beam Cylindrical Fuselage A3 FRP Shell Cone Wing 1 B FRP Beam Aerofoil Pylon 1 C FRP Complex Pylon Engine 1 D Assembly Shell Cylinder Pylon 2 E FRP Complex Pylon Engine 2 F Assembly Shell Cylinder Wing 2 G FRP Beam Aerofoil Pylon 3 H FRP Complex Pylon Engine 3 I Assembly Shell Cylinder Pylon 4 J FRP Complex Pylon Engine 4 K Assembly Shell Cylinder Vert stabiliser 1 L FRP Beam Aerofoil Vert stabiliser 2 M FRP Beam Aerofoil Horz stabiliser N FRP Beam Aerofoil Front landing gear O Assembly Complex Assembly Rear landing gear P Assembly Complex Assembly Name Element ID Boundary – – Tarmac 1 Ground – – represent the components within the structure that could in theory be broken down further into simpler IEs,1 but doing so would mean creating multiple elements out of a single structural component. An example of this can be seen in the elements for the aeroplane in Table 17.2, where the fuselage has been broken into separate elements in order to better define the geometry. However, when it comes to similarity matching, there are benefits to defining it as a single complex element. Using aeroplanes as an example, it may be beneficial to define the fuselage as a single element so that each aeroplane now shares a common feature: a fuselage element attached to two wing elements. Secondly, the complex class can be used in the case where it is beneficial to represent a collection of components as a single element, for example the landing gear in Table 17.2 is represented as a single complex element. The third case where the complex class is useful is when there exists an element which is not easily described by a simple shape, for example the rotor hub on a wind turbine in Table 17.1. 1There might appear to be a contradiction in the terminology here, in the idea that an irreducible element might be decomposed. However, the term is used here in the sense that an IE model can provide a description of sufficient complexity for the purposes of matching structures, but the user may choose a higher resolution.
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