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  3. When trying to solve the harmonic acoustic wave propagation in a pipe in time domain – is there any relationship between P and Mass source excitation transient Q? It looks to be different than Q = 2P/C.

When trying to solve the harmonic acoustic wave propagation in a pipe in time domain – is there any relationship between P and Mass source excitation transient Q? It looks to be different than Q = 2P/C.

Tagged: 19.2, acoustics, harmonic, mass-source, mechanical, structural-mechanics, transient
    • April 5, 2023 at 2:32 pm
      FAQFAQ
      Participant

      Regarding transient analyses, the mass source term becomes mass source rate, meaning it has units of kg/m/s^2 (over an area), so one would take the time derivative of Q (e.g., if Q=Qo exp(jwt) and Qo=2*rho/c, then the mass source rate is dQ/dt or Qo*jw*exp(jwt) when constructing the time-history loading).

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