9/4/2023 0 Comments Robust notion meaning![]() ![]() Making a high-performing kinematic system implies that the system (a mechanism) should be ideally constrained, resulting in ideal mobility. The notion of mobility is used in Robust Design to describe systems kinematic design 1. Also, Russian mathematician Pafnuty Chebyshevs’s name is often linked to the formula – read more at Wikipedia here. Moreover, the equations link to many names. In RD8 tools & systems, we use Kutzbach’s modification of Gruebler’s mobility equation as a foundation for the mobility equation. The focus of this example for both products is the interface between the “housing” plastic part and the PCB part. In the example below two different products are shown. REAL LIFE ROBUST DESIGN EXAMPLE: a Microsoft vs. The variation, in this case, does not result in a collision and hence there is no drop in design profit and/or quality. The exact same variation between the positioning features (orange features) is simulated in the ROBUST DESIGN example. The impact of this collision needs to be verified or could be seen as negative design profit (additional engineering is needed, extra material or requirements needs to be considered, extra requirements to production/assembly, poor impact on customer value, ….) and is hence noted as a drop in quality. The consequence of the variation is a part-part collision. In the “PRODUCTION” scenario variation is simulated by simulating a variation in the distance between the two positioning features (orange features). In the example, the “STANDARD DESIGN” looks fine in the “CAD WORLD” scenario. ![]() In a 3D CAD system, everything is perfect! A Robust Design on the other hand is a design that is optimized to handle variation. Mechanical product development: a standard design is often based on what is easy to sketch/create in 3D CAD systems and what looks nice to the eye (e.g. The illustration below shows two designs: Illustrated by the interface by two components (in a 2D cross-section) purple and orange. Mechanical engineering: a basic example and illustration of a standard design and a robust design. Topics here are “complexity reduction” & “decoupling”ĮXAMPLE | Kinematic design: interface design.Taguchi methods (sub-set to Six Sigma) – Genichi Taguchi IC4) are characterized as sensitive as they may not work when it is cold, it is snow or there are leaves on the track.Ĭlassically Robust Design is based on theories with areas and names: On the other hand, some Danish trains (e.g. See how Top Gear tries to “ kill a Toyota” with no success. For example, you would characterize an old Toyota Hilux as a robust product as it will work day & night, even though exposed to dust, mud, wear & tear – even demolition. In that case, the end-user should not experience any change in the product’s behavior. For example, suppose the product gets exposed to variation in production (e.g., tolerances or material abnormalities) or use case (e.g., where the user is applying force or holding the product). In essence, the meaning of Robust Design is to minimize the impact of variation in a product. ![]()
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