cable dynamics - Dipartimento di Meccanica

CABLE DYNAMICS
Experimental tests for the
evaluation of the dynamic
properties of cables, dampers,
spacers
D I PA R T I M E N T O D I M E C C A N I C A
Description
The knowledge of the cable damping properties
allows to correctly estimate, through numerical
models, its response to external inputs such as the
wind disturbance. Moreover, because of the small
damping associated to this kind of structures and the
consequent instability issues arising when they are
immersed in force fields (e.g. cross wind), the use of
suitable damper devices are often mandatory.
Certifications
•Test “Stockbridge Type Dampers Dynamic
Characterisation” (ISO9001:2008 certification).
•Test “Stockbridge Type Dampers Effectivness Test”
(ISO9001:2008 certification).
References
Salvi Spa, Dervaux, Terna, Sadeven, Cariboni,
Mosdorfe, Sefag-Pfisterer, Enel, EDF.
Department Address
Dipartimento di Meccanica
Building B23
via La Masa, 1
20156 Milano - Italy
telephone: +39 02 2399 8500
fax: +39 02 2399 8202
e-mail: [email protected]
Website
www.mecc.polimi.it
Laboratory Address
Building B13
via La Masa, 34
20156 Milano - Italy
Instrumentation & Facilities
•Gearing Watson electro-dynamical shaker + amplifier
(V617/DSA4-8k).
•Unholtz&Dickie electro-dynamical shaker + amplifier
(SA15-S452).
•B&K 1050 controller.
•Electro-mechanic actuator for the “50m length” cable
span tensioning.
•HBM 250 kN load cell for the “50m length” cable span
tensile load.
•Kistler 30 kN piezoelectrical load cells for Stockbridge
dissipative force.
•B&K accelerometers for the cable and the Stockbridge
vibratory state.
•Strain gage for the cable stress close to the clamp.
•Laser transducers for the cable nodes vibrations.
•Accelerometers and load cells conditioning and
amplifiers.
Activities
Cable self damping
•Decay Method.
•Power Method.
•Inverse Standing Wave Ratio.
Stockbridge damping performances
•Force vs displacement FRF.
•Mechanical impedance.
•Imposed constant speed or constant displacement.
Cable effectiveness test
•Cable + damper damping test.
Spacers characterization
•Stiffness and damping properties.
•Hysteretic cycle.
•Short circuit test.
•Slip force test.
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