![]() Moreover, the wing system might be sensitive to snap-buckling type of instability for some combinations of structural parameters. (2013b) demonstrated via nonlinear investigations that the linear buckling analysis is not very reliable as far as the static critical condition is concerned. Only recently (see Demasi et al., 2013b, Cavallaro et al., 2012, Cavallaro et al., 2014c, Cavallaro et al., 2014a), the research moved on the fundamental understanding of the peculiar nonlinear response of Joined Wings, with focus on the so-called PrandtlPlane configurations (e.g., Frediani, 1999, Frediani, 2002, Frediani, 2003, Frediani, 2005, Frediani et al., 2012). Different works discussed theoretical aspects related to the structural nonlinearities (Sotoudeh and Hodges, 2011) and also involved aeroelastic investigations (Patil, 2003, Demasi and Livne, 2005, Demasi and Livne, 2009b, Cavallaro et al., 2014). Besides numerical approach, also experimental work (Kim et al., 2011, Boston et al., 2010) was carried out to explore the joined-wing Sensocraft (Reichenbach et al., 2011, Scott et al., 2011, Heeg and Morelli, 2011) response when subjected to follower static loads. Several efforts considered mechanical loading and showed a highly complex nonlinear behavior of Joined Wings. This suggests taking one step back and focusing on the nature of the involved nonlinearities, with the final goal of capturing the essential underlying physics for a more accurate and efficient design of reduced order models. Unfortunately, even advanced reduced order modeling techniques proved not to be very effective (see Demasi and Livne, 2007, Demasi and Palacios, 2010, Phlipot et al., 2014, Teunisse et al., 2014) when Joined Wings were considered. ![]() In this scenario, reduced order models specifically tailored to retain the important nonlinearities of Joined Wings can be an ideal solution. On the other hand, neglecting structural nonlinearities in the early design stages may lead to a posteriori-verified unacceptable solutions and can determine a significant increase of design costs. What has proven to be very effective in the past for classical cantilevered configurations, then, cannot (Kim et al., 2008) be directly translated into procedures that have the same degree of computational efficiency and accuracy, when Joined Wings are considered (Weisshaar and Lee, 2002). Employment of these lower fidelity tools is actually a practical requirement since a Multi-Disciplinary Optimization (MDO) generally involves a large amount of analyses. As a consequence, preliminary design complexity is increased (Blair et al., 2005): existing procedures successfully adopted by the aerospace industry rely mainly on linear tools not able to correctly reproduce these effects. Snap to option would be really useful.Typical joined-wing configurations (Wolkovitch, 1986, Chambers, 2005) are characterized by significant structural geometric nonlinearities (Blair et al., 2005, Kim et al., 2008, Liu et al., 2010). And usually they don't actually end up exact. ![]() One of the huge time wasters when using SH3D is tweaking walls so that they line up exactly. Like having 10 moveable grids in 1!Ī Shift+Alt drag when ending a wall which allows a wall to snap to the center of the end of an overlapping wall would be a huge improvement. (Wings3d also has the choice of using 'Alternative constraints' - very useful if you are doing most of your work in meters, but need to edit something - like furniture - in feet.) ![]() ![]() Like Press CTL+drag moves (/rotates/scales) 1 unit SHIFT moves 5 units ALT 10 units CTL+ALT 0.5 units, etc - you get the idea. I wonder if something like Wings3d's constraints could be implemented.īasically these are an (improved) version of snaps. Or, snapping to existing vertexes, like in Blender.Īpparently snaps are not feasible (or problematic to implement) in SweetHome. Still, I do agree with Knubbi that snapping to a user-set grid (say 4') can be a real time-saver. Especially when combined with the ability to add precise dimensions by pressing ENTER. In the facts, when magnetism is active, drawing with the mouse "snaps" to the closer cm or inch, depending on the current zoom and this way to approximate pixels to lengths appeared in version 1.4.Įmmanuel Puybaret, Sweet Home 3D developer Because buildings in real life don't snap to a grid. ![]()
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