Theoretical Analysis Of And Experimental Research On The Vibration Characteristics Of Cylindrical Explosion Vessel

The explosion vessel is a kind of special pressure vessels and usually used for experimental research on bombing and explosive effect. And it also can be applied as security protection components with certain special demands. By now, the explosion vessel design is still at static level and the researches on its dynamic design and dynamics still need more efforts. The rules for pressure vessels design in United States and other countries have not defined the design standards of explosion vessels. This thesis mainly aims at providing technical support for other similar vessels'design by analyzing the vibration characteristics of a cylindrical explosion vessel. This study applies three methods: theoretical analysis, the finite element simulation and experimental research to learn the vibration characteristics of the explosion vessel and some encouraging achievements are obtained.The main efforts and results of this study are as follows:â‘ Based on classical theories, a mathematics model for free vibration of this vessel is established and an analysis formula is derived form this model.The analysis is benefit to research to vessel.vibration characteristicsâ‘¡The Demchuk-Bake model is applied to analyze the vessel's elastic vibration response of one dimension. The curves of the strain change with the time under 10g, 30g, and 50g TNT are achieved. The limitation of this method is also pointed out. Furthermore, this vessel's vibration response of two dimensions under the concentrative loading is studied. It is approximate to the actual condition and can explain"strain increasing phenomena"more exactly because it involves in rotatory inertia and transverse shear.â‘¢The vibration response of the explosion vessel under 10g, 30g, and 50g TNT is simulated with the non-linear finite element programme of the ANSYS/LS-DYNA. Meanwhile, The method of (atmosphere) coupling between the vessel and the distributed load is introduced. Their frequency characteristics are interpreted. The simulation results show that the strain peak increases with the increasing charge, but the main vibration frequencies are basically invariable and are close to the basic frequencies of theoretical vibration's eigenfrequencies.â‘£In three chemical explosion experiments, the circumferential strain of the cylinder's cross section under different explosive load is measured, and the frequency characteristics of the strain waves are analyzed. Based on the experiments, the internal relations among the charge, the strain, the main vibration frequencies and the eigenfrequencies are studied. The differences among the theoretical analysis, the finite element simulation and the experimental research, and the reasons why these differences occur are discussed.The research achievements in this thesis will provide some referential value for designing the similar explosion vessel.