Renold Clutches & Couplings - casa sueca s.a.
Renold Clutches & Couplings - casa sueca s.a.
Renold Clutches & Couplings - casa sueca s.a.
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Damping Characteristics<br />
Coupling damping varies directly with torsional stiffness and<br />
inversely with frequency for a given rubber grade. This<br />
relationship is conventionally described by the dynamic<br />
magnifier M, varying with hardness for the various rubber<br />
types.<br />
M =<br />
K<br />
Cω<br />
Torque = (k + icω) aeiωt + δ<br />
δ<br />
Deflection = aeiωt<br />
This property may also be expressed as the Damping Energy<br />
Ratio or Relative Damping, which is the ratio of the damping<br />
energy, AD, produced mechanically by the coupling during a<br />
vibration cycle and converted into heat energy, to the flexible<br />
strain energy Af with respect to the mean position.<br />
Where C = Specific Damping (Nms/rad)<br />
K = Torsional Stiffness (Nm/rad)<br />
ω = Frequency (Rad/s)<br />
tan δ = Cω = I<br />
K M<br />
M<br />
δ<br />
ψ<br />
= Dynamic Magnifier<br />
= Phase Angle Rad<br />
= Damping Energy Ratio<br />
The rubber compound dynamic magnifier values are shown in<br />
the table below.<br />
Torque<br />
Mid Torque<br />
Mdm<br />
Mid<br />
Deflection<br />
Af<br />
AD<br />
Rubber grade<br />
M<br />
NM 45 15<br />
SM 50 10<br />
SM60 8<br />
SM70 6<br />
SM 80 4<br />
Deflection<br />
ψ<br />
= AD = 2π<br />
Af M<br />
RENOLD Hi-Tec <strong>Couplings</strong>. Tel: + 44 (0) 1422 255000 Fax: + 44 (0) 1422 320273 E-Mail: sales@hitec.renold.com<br />
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