The Analysis Of Shock Resistance Behavior And Optimum Design For Black Box Of Marine Testing System Based On Floating Shock Platform

The shock resistance of shipboard equipment act as a significant indicator of the ship survivability.Therefore,the equipment needs to carry out the corresponding shock test before boarding the ship,and the equipment of medium and large equipment is relied on the floating shock platform.A large number of dynamic parameters such as acceleration and strain need to be reliably and efficiently recorded and stored when the underwater explosion test is developed using floating shock platform.As a special multi-source dynamic information recording system,the black box has a strong anti-explosion and anti-shock protection capability and can provide a reliable guarantee for the data storage of marine testing system such as floating shock platforms.First of all,the characteristics of the underwater explosion test of floating shock platform are analyzed in this paper.The technical requirements of the black box for the marine testing system are obtained,and the structure and composition of the black box is accomplished by using the analytical tools such as the ultimate ideal solution and the technical contradiction matrix in TRIZ theory.By considering the installation space,pressure resistance and vibration isolation performance of the black box,the specific dimensions of the all parts are determined.Then,according to the underwater explosion testing conditions of the floating shock platform specified in MIL-S-901 D,the dynamic response of the floating shock platform is calculated based on the acoustic-solid coupling method.On the basis of the theory of shock spectrum,the acceleration of inner bottom on platform is converted to the design shock spectrum to quantitatively describe the shock environment of the floating shock platform.The time history curves of acceleration of the inner bottom on platform and the design shock spectrum are regarded as the input loads for analyzing the shock resistance of the black box.In addition,the region where the dynamic response of platform is small under the underwater explosion load is taken as the installation position of the black box.The dynamical response of the black box under shock load is analyzed by using the time history curve of acceleration of the inner bottom on platform and the triangular wave acceleration curve converted from the shock spectrum as the input loads.The allowable stress and equivalent plastic strain are used as evaluation parameters to check the intensity of the black box,and the weak links of shock resistance of the black box are obtained.Finally,the structure and materials of black box are optimized.Aiming at the weak links of the black box against the shock,the structure of black box is improved from three aspects which are changing the installation mode of the storage hard disk,increasing the thickness of the heat insulating as well as damping layer and adding the cushioning material layer.Considering a variety of shell materials and the use of porous aluminum foam composite material as the heat insulating and damping layer,the optimization of material is developed to enhance shock resistance of black box.By comparing the intensity of the optimized black box,the best optimization scheme are provided.