At the leftmost position allowed for the movement of the LSRA platforms, the outer ridges reach alignment to the end of the rail guide that corresponds to position P5.
The majority of the LSRA parts model are bars (or beams) either longitudinal or transversal.
Moreover, this is also important to evaluate the overall vibration modes of the LSRA, to associate its origins to specific parts or subassemblies, and to establish possible correlations among vibration modes.
At position P3, the platforms are aligned with the middle point with the center axis of the LSRA base structure.
All modes considered are a subset of Table 1, for which the mechanical waves propagate transversally in phase opposition, along with the subassembly formed by the guide rail and the horizontal bar at the top, on both sides of the LSRA. The number between brackets, near the frequency value, corresponds to the number of that mode as listed in Table 1.
The parts at the primary assembly of the magnetic circuit of the LSRA are responsible for a set of vibration frequencies, for which the contributions of other parts or subassemblies are negligible.
The complete information gathered from the simulations helps to identify the most significant modal frequencies of structural origin that allow the full characterization of the LSRA regarding vibrations.
Jose Salvado was responsible for adapting the 3D model of the LSRA and prepared and ran the simulations in SolidWorks.
Caption: FIGURE 1: General view of the real LSRA considered in this study.
Caption: FIGURE 2: The two main LSRA 3D model assemblies: (a) isometric view of the base parts (longitudinal and transversal bars) and the secondary of magnetic circuit (bar mounted in the middle mounted over transversal bars); (b) perspective view of the platforms subassembly showing the three coils and teeth of the primary of magnetic circuit (some parts shown in wire frame view for reading purposes).
Caption: FIGURE 5: An example of the LSRA configurations regarding the positions of the platforms: (a) at P1, thus aligned at the rightmost end; (b) at P3, aligned with the symmetry axis (base and platforms).
Caption: FIGURE 21: Spectral analysis showing modal frequencies excited for the LSRA at P1.