Dynamic Characteristics Of The Elastic Clay Buffer

The viscoelastic damper has a great application in vehicles, ships and weapons with its large capacity, high stability and simple structures. It seems very significant to study its application in artillery recoil mechanism to enhance the overall performance such as weight, fire intensity and mobility, etc. Taking the viscoelastic damper as research object, this thesis, which is concerned with the practical feasibility of application in recoil mechanism, mainly discuss its dynamic cushioning performance through theoretical analysis, including mathematical model of elastic clay and the damper, impact experimental testing and system simulation.Through analysis of the principle of drop hammer experiment and setup of the test system, drop hammer impact experiment was held in three different heights and with identification of experimental parameters and simulation modeling, fitting was coincident with the experiment, the test result is verified that measuring displacement signal of the piston rod and using the velocity force equation is effective. With energy analysis, it points out that the viscoelastic damper has high energy absorption rate, and excellent dynamic cushioning properties.According to the laboratory conditions, the plan of pneumatic actuator impact experiment was designed to the further research of dynamic characteristics for viscoelastic damper; the working principle of the actuator was analyzed and the structure size of erecting tables was designed and carried on FEM strength check. The impact experiment was held in three pressures and it turns out that the viscoelastic damper still has excellent dynamic cushioning properties under high impact. Combination of drop hammer impact experiment, the results show that the damping coefficient is associated with the structure size and material, and the index of speed depends on the impact to the environment.The drop hammer impacting experimental system of the viscoelastic damper was built based on AMESim-a software for hydraulic system simulation. The equivalent transformation for the experiment was conducted and parameters for various modules were set according to damper structure and the material. By comparison, the simulation and testing were in good agreement and it is clear that this model can be used to drop hammer experiment. The linear relation between damping coefficient separately and piston thickness, piston diameter and material viscosity, and non-linear relation with the clearance are consistent with theoretical study. In order to study whether the viscoelastic damper is superior to recoil mechanism, the drop hammer impact test system of a simple trench recoil absorber was established, in which a variable throttle was used for the trench equivalent and two control functions were set. The simulation results show that the depth of trench is approximate straight line under the quadratic control function which is easy to process and emerge the platform effect. The dynamic cushioning performance of viscoelastic damper was much better when comparing with the traditional one, which indicates a high feasibility of the application of the viscoelastic material in recoil mechanism.