Redesign of a Vibrating System
Redesign of a vibrating system involves modelling of materials - generally
 Structural materials: metals and alloys |
Viscoelastic polymers: natural and synthetic rubbers (with additive) |
For metals and alloys:
Stiffness is a function of elastic moduli ( E, G, K ) and the geometric dimensions depending on the type of loading and deformation (bending, twisting etc.)
Damping and Loss Factor are generally constant.
Inertia depends on Density and Geometry.
| Materials |
Density
(kg/m3)
|
E
GPa |
Loss factor
O ( ) |
| AI |
2.7× 103 |
|
10-5 |
| Brass |
8.5 × 103 |
104 |
10-4 |
| Steel |
7.8 × 103 |
210 |
10-3 |
| Cu |
8.9 × 103 |
103 |
10-2 |
Cu-Mn
(40 - 60)
|
7.2× 103 |
84 |
10-2 |
Concrete
(dense)
|
2.3 × 103 |
27 |
10-2 |
|
