1. Univ logo Vibration Suppression of Stay Cables Using Absorbers Incorporating Inerters Mr Jiannan Luo Dr Jason Zheng Jiang Dr John Macdonald University of Bristol UKACC PhD Presentation Showcase

2. Univ logo UKACC PhD Presentation Showcase Slide 2 Background and motivation  Background and motivation   Cable characteristics   Cause of vibration   Bad effect of vibration  Cables with absorbers

3. Univ logo Introduction of inerter  Ball-screw inerter made at Bristol   Mass =2.5kg   Inertance (adjustable)=70kg UKACC PhD Presentation Showcase Slide 3

4. Univ logo UKACC PhD Presentation Showcase Slide 4 Research methodology & past studies

5. Univ logo UKACC PhD Presentation Showcase Slide 5 Sample structures Structure 1 Structure 2 Structure 3 Structure 4 b&c in parallelb&c in seriesc&k in parallel, then in series with b c&b in parallel, then in series with k

6. Univ logo UKACC PhD Presentation Showcase Slide 6 Sample structures  Structure 1   Improved damping ratio   Decreased cable’s frequency   Optimum damping ratio ζ=0.156, approximate 5.9 times of optimum for damper only  Structure 2   Optimum damping ratio is better than structure 1, ζ=0.160 approximate 6.0 times of optimum for damper only   An extra DOF is added

7. Univ logo UKACC PhD Presentation Showcase Slide 7  Structure 3   Improved damping ratio compared with structure 2 while b is relatively small.(b<2.363)   Optimum damping ratio ζ=0.160, same as result of structure 2   An extra DOF is added  Structure 4   Improved damping ratio compared with structure 1 while b is relatively small.(b<1.855)   Optimum damping ratio ζ=0.160, same as result of structure 1   An extra DOF is added Sample structures

8. Univ logo UKACC PhD Presentation Showcase Slide 8 Sample structures

9. Univ logo Conclusions and Future Work  Conclusions   Overall some inerter-based absorbers are more beneficial than viscous damper only.   Among all structure tested, structure 4 is the most beneficial structure for inertance limited to a certain amount (b<0.5).  Future work   More modes of the cable should be considered.   Minor factors will be taken into consideration.   Modelling cables with inputs like wind, traffic and etc. UKACC PhD Presentation Showcase Slide 9