Thanks all for your responses, still...I am not convinced to use a snubber to arrest the vibration. (Ie increase the natural frequency of the system).
let us take cases of a transfer line system that vibrates in the startup/shutdown cases and used a snubber to minimize the vibration.
In the startup case, the snubber will activate due to vibration and it acts as a rigid support. If the vibration is a continuous phenomenon and the snubber remains active. Since it is a startup case further movement of the pipe due to temperature also will restrict by the snubber and it creates expansion stresses in the system. In such cases, application of snubber can be justified?