Dynamics and Wind induced Dynamics Exam

Question 1

What means mechanical admittance?

Answer 1

• The relation between harmonic force and structural response
• The dependency between deflection and aerodynmic force

Question 2

What influences the structural damping?

Answer 2

• Material
• Cross-section geometry
• Supportig conditions
• e.g. tower: height of structure

Question 3

What is the reason for self- induced vibritaion?

Answer 3

Modification of the aerodynamic properties dependent on structual deflection

Question 4

What is influenced by the structural damping?

Answer 4

Maximum amplitude in resonance case

Question 5

What is the difference with respect to flow velocity for the 3 wind effects GIV / VIV / SIV?

a) not decisive/ always critical / the higher the worse

b) the higher ther worse / always critical / the higher ther worse

c) the higher the worse / sometimes critical / the less the worse

d) the higher the worse / sometimes critical / the higher the worse

e) sometimes worse / sometimes critical / the higher the worse

Answer 5

d)

Question 6

Which aspect influence the vulnerability for VIV?

A) Shape of the cross-section

B) Surface Permeability

C) Eigenfrequencies

D) Scruton number

Answer 6

A)
B)
C)
D)