Hi Karthikeyan,

There is a big difference between a recording of a sound or noise saved in a .wav file and a recording made using a calibrated microphone and a data acquisition system that saves the sound pressure data in Pa, from which a loudness in dB(A) or Sones could be computed.

A .wav file takes data from a recording in Pa and converts it to a relative magnitude between +/- 1. When that happens, you lose the reference to the measured loudness.

What version of ANSYS are you using?  In 19.1 there is a Harmonic Acoustics which is what you should use.

Harmonic Response is for structures, not acoustics.