Study on the Vibration and Noise Control in Piping System Based on the Phononic Crystals

The feasibility of the phononic crystal applied in the piping system to control the vibration and noise is discussed,and the vibration band gap characteristics and modal analysis of the one dimensional tubular structure phononic crystal are studied. The results show that the first vibration band gap has no influence as the elastic modulus of metal increases,but the first vibration band gap initial frequency and cutoff frequency increase as the elastic modulus of rubber increases; the initial frequency and cutoff frequency decrease as the lattice constant increases, the cutoff frequency decreases as the stainless steel tubular thickness, and the initial frequency increases first and then gradually decreases, there has no influence for the first vibration band gap as the external load increases; through the modal analysis we obtain that when the frequency increases to a certain value, there is only the rubber vibrate.