Research On Shock-resistance Of Typical Equipments Interacted With Ship Structure

In this paper, the shock resistance of the typical ships and equipment on board was analyzed by numerical experiment method combined with relevant theories of anti-shock integrative analysis to equipments and hull structure. In this paper, based on anti-shock strength and distortion analysis, the anti-shock and safety performance can be raised from the basic theory to numerical experiment practice. It is designed to provide a reference for the researches of ship equipment anti-shock performance.Firstly, after reading related papers and understanding the current research circumstances, conclusions could be roughly summarize the study achievement about anti-shock performance of ship equipment by some deeply investigating work. Then, the necessity of the of anti-shock characteristic analysis of ship equipments was brought forward as a foundation for further researches.Secondly, the analysis of the stiffness characteristics of a typical marine equipment was carried out. Taking a main steam turbine low-pressure cylinder as the object of study, with the basic theory of static stiffness and dynamic stiffness, we made a three-dimensional solid model of a low-pressure cylinder, and continued to analyze static stiffness and dynamic stiffness characteristics of equipment under different working conditions. Obtaining device's static stiffness and dynamic stiffness characteristics by analysis of numerical experimental results, the principles of influences from their working conditions was summed up.Thirdly, the impact of a marine equipment safety were evaluated separately by time-domain simulation and frequency-domain simulation (DDAM). Based on the German military standard BV0430-85, the ship equipment, the basic time-domain simulation method, the safety assessment methods of various components under time-domain load were summarized by taking account of non-linear factors of equipments; and with Frequency-domain Simulation Method (DDAM) theory, impact analysis of a typical turbo unit and assessment of its impact safety performance were carried out. From the obtained weak part of typical ship equipments, reasonable modifying measures were output as a reference for designs of anti-shock ship equipments.Finally, damage characteristics of shipboard equipment caused by effects of the pulsating load of underwater explosion bubbles was taken into account. Based on principal-and-subordinate system theory and integrative models of devices fitted in the hull structure, as well as the consideration of elasticity and plasticity of hull structures, the research on the dynamic response of the equipments due to the pulsating load of the bubbles was carried out, and disciplines of the response were discovered. The obtained damage mechanism of the devices was found, making a reference for related anti-shock researches of marine equipments.