Numerical experiment methods for ship hull and equipment integrated analysis on shock resistance of shipboard equipments

Based on the theory for coupled vibrations of master-slave systems, numerical experiments were carried out to explore how to evaluate the shock resistance and how to design the shock protection for shipboard equipments, especially for large-scale shipboard equipments. By choosing shipboard supercharged boilers and gear cases as research objects, the non-integrated and integrated exemplification analyses were investigated numerically by devising a series of shock input data. The non-integrated analysis method for shock resistance does not take the coupling effects between the equipment and ship hull into account and cannot reproduce the real shock environments of shipboard equipments precisely. For the underwater explosions in the middle-far fields, the non-integrated analysis results are greater than the integrated analysis results, and for the underwater explosions in the middle-near fields, the non-integrated analysis results are smaller. The ship hull and equipment integrated analysis method can be used to evaluate the shock resistance of large-scale shipboard equipments subjected to underwater explosions in middle-near fields. If the existing situation can meet an integrated analysis, the non-integrated analysis results should be amended.