The main purpose of this study is to construct the first mode shape of the aluminum alloy plate with stiffeners using the wavelet packet node norm (in experiment) and then detect the crack locations by the two-dimensional discrete wavelet transforms. In numerical analysis, the first mode shape of the damage plate with stiffeners is simulated by finite element tool ANSYS and the damage locations of the plate with stiffeners are detected by two-dimensional discrete wavelet analysis. In experimental analysis, several accelerometers were used to measure the plate vibration signals which were excited by a shaker. The first mode shape of the plate with stiffeners is obtained by using the wavelet packet node norm. Finally, the damage locations of the plate are detected by two-dimensional discrete wavelet transform method. The applications of stiffeners and plates in assembling deck, bulkhead, sides and bottom of a ship play a very important role in the construction of a complicated ship. The experimental results reveal that the proposed modal analysis and the discrete wavelet transforms can effectively identify the crack locations of stiffened plates with a single crack or multi-cracks.
|Number of pages||12|
|Journal||Journal of Taiwan Society of Naval Architects and Marine Engineers|
|Publication status||Published - 2009 Feb 1|
All Science Journal Classification (ASJC) codes
- Ocean Engineering
- Mechanical Engineering