Equivalent viscous damping f+fD+f=f。 ∫fid+∫fn+jrau=Sfchu Conclusion:In steady state response,the energy input to the system due to the applied force is dissipated in viscous damping 目 主求2相季院 Equivalent viscous damping • Conclusion: In steady state response, the energy input to the system due to the applied force is dissipated in viscous damping I D s p f f f f    I D s p f du f du f du f du       