Research On Shock Resistance Design Of Testing-Cabin Used In Marine Explosion Test

In view of the practical problems of measurement and recovery of vitality data such as anti-explosion and anti-shock of ships,the monographical research on test and testing-cabin system has broad application prospects.In this paper,numerical simulation and experimental research methods were used to deeply study the testingcabin devices that meet the requirements of marine shock environment,and relevant environmental adaptability tests were carried out to verify the effectiveness of the testing-cabin system in complex marine environment,this would help to provide a basis for subsequent upgrades and the design works for the testing-cabin,which would be meaningful for the ship's shock protection and damage data testing and verification.The main contents and corresponding conclusions are as follows:(1)The criterion analysis method was used to analyze the shock environment of the testing-cabin structure in this paper,and the influence of structural damping on the spectral parameters was obtained.It was found that the damping parameter had a significant influence on the intermediate frequency band,as the damping increased,and the “shock amplification” effect gradually decreased.The calculation method of the input load of the testing-cabin was determined by converting the design spectrum data into a time-domain load.Considering the failure mode of shipborne equipment in the dangerous test environment,three optimum design demands for anti-shock of the testing-cabin were proposed.(2)According to the static analysis method,the testing-cabin structure that met the equipment testing requirements was designed.Based on the whole structure of the testing-cabin,the shock response analysis of the established vibration damping model was carried out,then the influence of vibration isolation stiffness on the time domain and frequency domain of different shock response parameters was obtained.It was found that with the change of vibration isolation stiffness,the acceleration response and the displacement response showed opposite trends,and it was necessary to comprehensively consider the structural form to select the appropriate stiffness range.(3)The shock dynamic behavior of the testing-cabin and its built-in equipment have been studied through a combination method of tests and numerical analysis.The shock test of different load and different vibration isolation materials was carried out on the module of the testing-cabin system.The overall shock environment and the response characteristics of different structures were obtained by analyzing the structural response.It was found that the upper response was significantly higher than the input load in the middle frequency band,and with the increase of the load,the structural response of the lower vertical stiffness was obvious.Considering the installation location of the internal equipment and structural safety of the testingcabin,it's necessary for the sub-structure to be optimized for damping and isolation performance.(4)Comparing the anti-shock performance of the testing-cabin under the action of different vibration isolation materials,it determined that the grid structure was the danger structural zone.When the shock load was low,the whole structure performed the same motion;as the shock load increased,the grid area response increased significantly.From the experimental acceleration response,it was found that different materials have different vibration isolation effect,and the vibration isolation effect of the vibration isolator was obvious better than other materials,but only the vibration absorber has the advantage of shock resistance.(5)By analyzing the different shock directions and different regional responses of the testing-cabin,it was found that the vertical shock response was more severe,and the shock response of the lateral shock would be significantly delayed.Then the effect of the overall stiffness of the testing-cabin and the thickness of the grid on the response of the weak region was investigated.The results showed that the overall stiffness would change the inflection point's frequency and the frequency of the peak spectral velocity of the structure,and the thickness of the grid could effectively restrain the structure from being affected by local vibration.Through the analysis of the shock spectrum parameters,it was found that the spectral acceleration parameters and spectral velocity parameters of the structural safety assessment should be considered more for the structure design of the testing-cabin.