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Phasor representation for a mass and spring

  1. Jan 31, 2015 #1

    While writing the fourier representation for the spring-mass system, we have the equation:
    (-jωm+B-S/jω).U(jω)=F(jω) with F,U,m,B and S being the force, velocity,mass, damping coefficient and spring constant respectively.

    From this equation, is it right to infer that :
    1) Force lags the velocity as F'(jω)= (-jωm) . U(jω)
    2)Force leads velocity as F'(jω)= (jS/ω). U(jω)

    However, physically the above argument doesnt seem to be correct. As force leads the velocity for a mass system and force lags velocity for a spring system.

    So could someone please correct me the mistake in my understanding.
  2. jcsd
  3. Feb 5, 2015 #2
    Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
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