Simulation Study On The Dynamic Characteristics Of The Multi-rod Impact Isolation Device

Inertial navigation system is an important equipment to realize intelligence and information for shipborne equipment.The anti impact performance of inertial navigation system determines the combat effectiveness and vitality of military ships in service,and it is a key step in the future naval battle.Therefore,in order to improve the anti impact performance of Shipborne inertial navigation equipment in service,Therefore,in order to improve the dynamic environment of the ship's inertial navigation system during its service,it is necessary to install an impact isolation device between the ship and the inertial navigation system.Taking a kind of impact isolation device composed of multi-rod parallel coupling as the research object,the following aspects are mainly studied:1)Based on the structural layout and spatial configuration of the multi-rod isolator,the dynamic model of a single isolator module was established by Lagrange method,and the dynamic response curve of the isolator module was obtained,and its stiffness characteristics were analyzed on this basis.The results show that the symmetrical layout of the module improves the uniformity of load distribution,and makes the transverse and longitudinal stiffness of the isolation device consistent;the transverse and vertical stiffness of the module show different characteristics,and the vertical impact resistance is better than the transverse2)Based on the coordinate transformation matrix,the dynamic theoretical equation of the device was established by using the spiral theory and the basic principle of multi-dimensional shock isolation.The analytical solution and numerical solution of the impact response of the device were obtained by decoupled treatment.Compared with the response results under the standard impact load of the simulation model based on ADAMS,the drop hammer impact test of the multi-bar shock isolation device was carried out by using the impact test machine.The results show that the multi-bar shock isolation device can effectively isolate the strong impact load under the standard specifications,and the theoretical impact response and ADAMS simulation response results have a high degree of agreement,which indicates the validity and accuracy of the theoretical model.The simulation and test response results are in good agreement.The simulation model can highly reduce the real response of the device after the impact,and still has a good isolation under the strong impact environment Impact capacity and shock isolation performance are stable.3)With the help of Adams,the parametric model of the multi-bar isolator was established,and the rigidity coefficient,damping coefficient,the vertical height of the dynamic and base platform,the radius of the hinge point of the dynamic and base platform,the radius of the hinge point of the dynamic platform and the angle between the hinge point of the base platform were analyzed The influence law of equal structural parameters on the impact resistance of the device,and solve the structural parameters when the impact resistance is the best within a specific range.The results show that the impact isolation rate is positively correlated with the increase of h?rh?ah?while negatively correlated with the increase of k?c?ab?rb.When the impact load is applied vertically,the impact isolation rate decreases with the increase of k?c?h?rh?ah,and,on the contrary,it increases with the increase of ?b?rb.Therefore,the analysis and research of the dynamic characteristics of the multi-bar impact isolation device provide theoretical basis and data support for improving the impact resistance of the inertial navigation system.