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Body loads in wave propagation..
 In solids, the wave propagation equation is obtained from stress equilibrium equations. We make use of constitutive and strain-displacement relations to convert these equations in terms of displacements
 In the above equations we assume that there are no body loads.
 The form of solution we assume for displacements is harmonic
 Plug these three displacements, u1, u2 and u3 in the equilibrium equations stated in .
 We end up with an Eigenvalue problem. This is nice.
 If body loads are present, then, it will no more an Eigenvalue problem. I haven't seen any test book /literature dealing with such problem.
Has anybody tried solving the wave equation with body loads. If so, you may please write me and suggest me some literature on this.
Thanks in advance.