CHE Chidong  CHEN Duanshi

(School of Naval Architecture, Oceam & Civil Eng., Shanghai Jiao Tong University  Shanghai  200030)

Received Nov. 23, 2006 

Revised Jan. 19.2007 

Abstract  Vibration energy transmission at corner interface of two infinite plates rigidly jointed at arbitrary angles was studied by wave approach so as to investigate the effect of blocking mass used for reducing plane bending wave transmission. Two local coordinate systems were introduced and six new non-dimensional coefficients implying corresponding ratio governing characteristic impedances of plates or blocking mass were introduced to simplify formulations of transmission and reflection coefficients. Five samples were tested in experiment. Discussions were carried out based on the comparison between prediction and experiment in terms of insertion loss. It is concluded that blocking mass at corner interface acts like a "low- pass filter", effective for vibration attenuation above certain frequency. The value of TL and IL in "attenuation band" depends mainly on mass per unit length and band width of "attenuation band" on mass moment of inertia per unit length of the blocking mass.

PACS number: 43.40, 43.55