Figure 1: Given the assembly structure of the 153-brick LEGO Technic ROLLING CHASSIS (a), our method quantifies the rigidity of the structure (b1) and finds the worst-case external load configuration (yellow arrows) that maximally deforms it (c). A larger rigidity value indicates a more rigid assembly and thus greater resistance to external forces. After we strengthen the initial model as per the recommendation given by our method, the reinforced model (b2) has its rigidity value tripled, and undergoes less deformation than the initial one under the same loads that twist the model. The physical experiments (c) also show results that align with the analysis of our method.
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