**4.3 Validation of form optimization**

The results concerning requirements contributing to the satisfaction of the goal of form optimization are shown in Table 10 (enhanced stability – according to force vector analysis), Table 11 (increased lightness – solid modelling analysis), Figure 2 (enhanced readability of CD titles – graphical depiction) and Figure 2 (scheme illustrating analytical stability modelling). For the first of the three requirements concerned by this goal, bionic tower 2 ranks in first place, while for the second requirement, bionic tower 1 is clearly the lightest, while for the last of the three requirements both bionic towers achieve a tie ahead of the conventional tower. The results support validation of the achievement of the goal sought of form optimization, albeit both bionic towers are deemed equivalent in this respect.


Table 10. Comparison of results for the maximum lateral disturbance tolerated without loss of stability in the three concepts.


Table 11. Comparison of mass data among the three objects.

Biologically Inspired Design: Methods and Validation 117

To validate the achievement of the goal of paradigm innovation for improved functional performance, verification of the achievement of the requirement of enhanced gripping of

Fig. 5. Illustration of the changes in geometry of the web that generate object securing force. Force and strength of material calculations were performed numerically and analytically, resulting in an estimation of approximately 0,5 N of vertical compression force per CD (based on analytical calculations developed from the physical comprehension of the phenomenon - Figure 5). Finite element modelling was pursued resulting in successful validation of the design for full capacity (Figure 6 – stress analysis under full capacity; Figure 7 – displacement under full load), yielding a safety factor of 166% and a maximum

Fig. 6. Rendering of Von Mises stress analysis for bionic tower 2 frame under full load,

**4.5 Validation of paradigm innovation for improved functional performance** 

objects in the bionic towers was sought.

elastic (recoverable) displacement of 7.7 cm.

obtained from educational 3D CAD software.

Fig. 2. Graphical depiction of readability of content titles for the three objects (from left to right: conventional tower, bionic tower 1 and bionic tower 2).

Fig. 3. Schematical depiction of analytical stability modelling for a lateral disturbance in the conventional CD rack, as well as in both the bionic towers designed.

#### **4.4 Validation of organization effectiveness**

To validate the goal of organization effectiveness, the proof of achievement of the requirement of storage with versatility of CDs, DVDs or books was sought by means of a graphical depiction (Figure 4) which is deemed self-explanatory with regard to this requirement's satisfaction.

Fig. 4. Depiction of three possibilities of dynamic storage of objects in the bionic towers.

Fig. 2. Graphical depiction of readability of content titles for the three objects (from left to

Fig. 3. Schematical depiction of analytical stability modelling for a lateral disturbance in the

To validate the goal of organization effectiveness, the proof of achievement of the requirement of storage with versatility of CDs, DVDs or books was sought by means of a graphical depiction (Figure 4) which is deemed self-explanatory with regard to this

Fig. 4. Depiction of three possibilities of dynamic storage of objects in the bionic towers.

right: conventional tower, bionic tower 1 and bionic tower 2).

**4.4 Validation of organization effectiveness** 

requirement's satisfaction.

conventional CD rack, as well as in both the bionic towers designed.

#### **4.5 Validation of paradigm innovation for improved functional performance**

To validate the achievement of the goal of paradigm innovation for improved functional performance, verification of the achievement of the requirement of enhanced gripping of objects in the bionic towers was sought.

Fig. 5. Illustration of the changes in geometry of the web that generate object securing force.

Force and strength of material calculations were performed numerically and analytically, resulting in an estimation of approximately 0,5 N of vertical compression force per CD (based on analytical calculations developed from the physical comprehension of the phenomenon - Figure 5). Finite element modelling was pursued resulting in successful validation of the design for full capacity (Figure 6 – stress analysis under full capacity; Figure 7 – displacement under full load), yielding a safety factor of 166% and a maximum elastic (recoverable) displacement of 7.7 cm.

Fig. 6. Rendering of Von Mises stress analysis for bionic tower 2 frame under full load, obtained from educational 3D CAD software.

Biologically Inspired Design: Methods and Validation 119

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**6. Acknowledgment** 

**7. References** 

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pending.

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Fig. 7. Rendering of maximum elastic displacement for bionic tower 2 frame under full load, obtained from educational 3D CAD software.
