Shipboard Equipment Shock Dynamics Numerical Experiment Technology Architecture

Navel ship would be subjected to explosion load of underwater weapon in the attended time. Contact explosion would destroy the ship hull and shipboard equipment. Non-contact explosion wouldn't destroy ship hull, but shipboard equipment would be destroyed in largescale region. Therefore, shock resistance performance of equipment is very important to navel ship survivability. However, Shock resistance evaluation and shock protection design of shipboard equipment (especially shipboard large-scale equipment) are still problems which need to be solved urgently. There is no mature computation method in domestic. And there is no relative shock test and trial data. In addition, there is no research advancement published in the journal overseas in the domain because of keeping secret. Shock test, model test, trial of underwater explosion and numerical simulation are primary techniques used to investigate shock resistance performance of equipment at the present time. Shock test couldn't be carried on shipboard large-scale equipment restricted to shock machine and floating shock plat. The results of model test couldn't be extended to ship and equipment through some law of similitude at present. Trial of underwater explosion cost very much and the test numbers are very limited. Therefore, sense test results couldn't be obtained by trial from probability statistics point. Consequently, numerical experiment provides extensive space for shock resistance performance of shipboard equipment. Shipboard equipment shock dynamic numerical experiment technology architecture is established in the paper. Numerical experiment of shipboard equipment and hull integrated analysis on shock resistance is investigated and threshold of shock resistance of shipboard equipment is presented preliminary.Firstly, shipboard large-scale equipment and parts of equipment are classified. Connecting relationship between parts and between equipment and ship basement are generalized. Shock environment characteristic of shipboard equipment is discussed. And shipboard equipment shock dynamic numerical experiment technology architecture is established considering complexity and particularity of equipment.Secondly, model building technique of large-scale equipment subjected to shock loading is expounded taken shipboard gear case for example. Finite element model of gear case is built using hexahedron meshing technique taking connecting bolt, pin, dashpot and so on into account based on geometry cleaning. Interaction between components of complex structure is simulated by contact surface simulation technology. And accuracy and validity of finite element model are verified.Thirdly, shipboard equipment shock dynamic numerical experiment technologies are expounded taken shipboard gear case for example, which are integrated analysis technology on shock resistance of shipboard equipment, pretightening force of connecting bolt simulation technology, mesh suitability between big component and small component simulation technology, flexible fixing between equipment and ship basement simulation technology, oil pressure and stress of journal bearing solving technology and running state of equipment simulation technology.Fourthly, integrated analysis is adopted to analyze shock resistance of shipboard supercharged boiler and gear case based on numerical experiment started with master-slave system coupled vibration theory. The simulation results are compared to non-integrated analysis results. The applicability of non-integrated analysis and integrated analysis is pointed out.Fifthly, numerical characteristic of integrated analysis is investigated based on statistic analysis method. And empirical formula to calculate maximum of stress standard deviation is given by analysising large numbers of integrated analysis exemplification results. And stress standard deviation is suggested to take as shock failure criterion when shipboard equipment is subjected to shock loading. Threshold of shock resistance of shipboard equipment is presented preliminary.The research aims to obtain shock resistance research technique of shipboard equipment suited the situation of country. And reference is provided for shock resistance evaluation and shock protection design of shipboard equipment. Therefore, guidance is given to engineering application.