Research On Shock Response Analytical Method Of Piping System Coupled With Ship Structure

Piping system which transfers fluids and power for equipments in the ships shouldhave sufficient shock resistance to go through all kinds of impact that may suffer duringtheir service. In recent years the problem of weak pipeline system has been exposedgradually, the anti-shock ability has become the short slab of the impact resistance of thebattleship. So it’s necessary to carry out studies on analyzing method of transient responseof piping system subjected to impulse loading, which is of great significance to enhancethe impact resistance of piping systems and ships.In this paper, time-domain analysis method used to evaluate equipments was taken todemonstrate behavior of piping system subjected to impulse loading, and estimate theimpact resistance of the piping system. Respectively, the finite element method anddiscrete time transfer matrix method to carry out pipeline impact simulation has been used,which aims at presenting quickly efficient method of evaluating pipeline shock resistance,and giving guidance for pipeline impact design and evaluation.Firstly, a complete set piping system was modeled with shell elements. Using theexplicit finite element code ABAQUS have simulated the piping system subjected toimpact loads defined by German military standard BV0430/85. Dynamic responses ofpipe structures as elbows, tees and pipe ends were investigated, and then weaknesses ofpiping system were given by the calculation.Secondly, based on the simulation of the complete set piping system, a simplifypipeline analysis method is promoted. The strength modify factor about the beamsimulation of the complex pipe structure has been obtained by large number of calculationcases, in order to eliminate the error caused by the model redundancy because of the beamelements modeling.Thirdly, the discrete-time transfer matrix method to perform the response of pipingsystem has been introduced. Deduced the pipeline six-degree of freedom transfer matrix,including axial vibration, torsional oscillation and plane bending of pipeline, as well asspecial point transfer matrixes for pipe clips, flanges, elbows or tees in the piping system.And a program was compiled based on the Matlab language to calculate the transientresponse of the pipelines induced by impact loading. Finally, the pipeline shock test has been designed and carried out, and the proposedalgorithm has been validated by the test results. The research of the pipeline responsecharacteristics to impact, and the effect of pipe response induced by the incentive, supportarrangement and the support elasticity have been explored in this test. Satisfactoryagreement between calculated and experimental data was obtained; proving that theanalytical methods proposed in this paper is viable.