smart technologies for safety engineering

240 Smart Technologies for Safety Engineering
original structure
optimal structure
Figure 6.18 Development of stresses in maximally loaded elements of the optimum adaptive structure
in Figure 6.15: (left) element 1; (right) element 2
stress levels can be observed. The results demonstrate the advantages of the proposed adaptive
impact absorption scheme over the purely elastic response of the initially optimized passive
structure. Smooth impact energy absorption in the first 15 ms could be achieved. The constraints
of Equations (34), defined by ˜β = 0.2 and ˜σ = 200 MPa, have remained inactive. Only 40 %
of the plastic distortion limit ˜β have been reached, see (Figure 6.16). Therefore, the structure
can effectively dissipate impact loads of significantly higher energy.
6.3.3 Comments
A VDM-based technique for quick structural dynamic reanalysis has been developed and
new algorithms for simulation of coupled structural modifications (mass, stiffness and plastic
original structure
optimal structure
Figure 6.19 Development of stresses in maximally loaded elements of the optimum adaptive structure
in Figure 6.15: (left) element 3; (right) element 4