Browsing by Author "Hsu, Ching-Yu"

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A Numerical Study of Hovercraft Main Hull Structural Response Subjected to Shockwave from Underwater Explosion
(2016)
Hsu, Ching-Yu
;
Liang, Cho-Chung
;
Teng, Tso-Liang
;
Hai-Anh Nguyen
;
機械工程學系
Hovercraft should be designed to survive in the extreme loading conditions, such as an underwater explosion (UNDEX). This paper used a finite element model based Zubr-class like LCAC (Air-cushioned landing craft) subjected to UNDEX to study dynamic responses of hovercraft main hull structure subjected to underwater explosion. A procedure which links together the finite element method (FEM) and Acoustic-Structure Coupling (ASC) method is developed. First, finite element model tests are conducted to verify and validate the propagation of shock response generated by an underwater explosive experiment of Ramajeyathilagam [3]. Second, finite element simulations of the hovercraft model subjected to UNDEX simulation that detonates of 9kg of TNT were presented. The responses of main hull structure of the hovercraft model are also discussed. The numerical results show that besides global response, the main hull structure of hovercraft sustains severe local response especially is the main deck and skirt. The results could offer a valuable reference for hovercraft structure design.
The Dynamic Responses of the Submersible Vehicle Mast with Different Cross-Sectional Shapes subjected to Underwater Explosion
(2016-01-01)
Hsu, Ching-Yu
;
Liang, Cho-Chung
;
Teng, Tso-Liang
;
Hai-Anh Nguyen
;
機械工程學系
A submersible vehicle mast is a device that extended above the surface of the water while the vehicle remains hidden below. Masts mounted above a submersible vehicle are used to support navigational instruments and various electronic devices, such as radar antennas and sensors. Submersible vehicle mast must be designed to survive extreme loading conditions, such as underwater explosions (UNDEX). The present study applied the finite element method, Cole's empirical formulation and acoustic-structure coupling method to simulate an UNDEX and investigate the survival capability of a damaged submersible vehicle mast. A shape optimization problem was solved for the submersible vehicle mast models subjected to UNDEX with different cross-sectional shapes are circle, ellipse and streamline shape, respectively. The submersible vehicle mast was modelled with cylindrical shapes. First, the cylindrical and rectangular plate in an UNDEX models were conducted and simulation results are close to the failure modes shown in experiments of Kwon and Ramajeyathilagam. Second, Three prototypes of submersible vehicle masts subjected to UNDEX were presented using the same method. The results were show the model with a circular cross-section is stronger than other designs when subjected to an UNDEX. The analytical results could offer a valuable reference for submersible vehicle mast design.