| Ships will be subjected to strong impacts from underwater and aerial explosions when operating at sea.This high-intensity impact will cause great damage to ships and ship-borne equipment,especially the damage caused by underwater explosions to ships.For serious.The transient loads caused by underwater explosions can not only cause great damage to the ship's structure,but also make precise ship-borne equipment malfunction or even directly damage,seriously affecting the combat effectiveness and vitality of the ship.Therefore,navies of various countries have gradually shifted their research directions to enhancing the impact resistance of ships and ship-borne equipment.Underwater explosion tests and impact tests are the main ways to verify the impact resistance of ships and equipment.During the test,data needs to be collected for the test target and impact environment,etc.for later analysis and research.Therefore,the measurement work of the test data is an important part of the impact test,which is directly related to the success or failure of the entire test.The measurement of the test data is completed by some precision measuring instruments,and these measuring instruments have weak impact resistance,and are easily damaged or damaged after being subjected to strong impact,which directly leads to the failure of the impact test.In order to ensure the anti-shock protection capability of precision measuring instruments,a double-layer buffer platform with a steel wire vibration isolator as a buffer element is now designed to provide anti-impact protection for precision measurement equipment in impact experiments by means of double-layer buffering.This article starts from the theoretical study of vibration isolation and shock resistance and the theoretical research of wire rope isolators,summarizes the relevant principles of vibration isolation and shock resistance,and the working principle and performance characteristics of wire rope isolators,and introduces the vibration isolation performance of vibration isolators Evaluation methods and selection principles;Secondly,according to the existing experimental equipment and measurement conditions,several fixtures for measuring the performance of the steel wire rope isolators are designed,which greatly improves the measurement accuracy and working efficiency of the steel wire rope isolators.By conducting quasi-static,dynamic and shock experiments on the wire rope isolators,the effects of structural parameters,heat treatment,and external excitation on the performance of the wire rope isolators are analyzed,and at the same time,the wire rope isolators have good vibration isolation and shock resistance performance;then The single-layer vibration isolation model and the double-layer vibration isolation model were established respectively.Through the simulation experiments on the single-layer vibration isolation model,the variation law of displacement response and acceleration response with natural frequency was summarized.According to the nonlinear characteristics of the wire rope isolator,the dynamic equations of the nonlinear double-layer vibration isolation system with soft stiffness characteristics are established,and the dynamic equations are numerically solved to analyze the mass ratio of the upper layer system to the lower layer system of the double-layer vibration isolation system,Stiffness ratio,vibration isolator damping,stiffness coefficient and other structural parameters have an impact on the shock isolation performance of the double-layer vibration isolation system.The results prove that the vibration isolator with softened stiffness characteristics as a buffer element has good impact resistance;As a reference,the performance change rule of the double-layer vibration isolation system summarized by the simulation solution is designed,and the solid model of the buffer platform is designed and simulated.Using the simulation method to explore the buffer platform performance parameters and input excitation and other conditions change,the buffer platform performance changes.Simulation experiments have proved the feasibility of the double-layer buffer platform with steel wire vibration isolator as the buffer element.From the three-fold line spectrum,it can be found that the buffer effect of the buffer platform is very obvious.The related research in this paper has certain reference value for the application of wire rope vibration isolator in shock resistance and the design of non-linear double-layer buffer platform. |
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