Research On Impedance Analysis And Optimization Design Of Diving Equipment Internal Base

Diving equipment as a national maritime strength of strategic equipment,for the country’s maritime security has a great impact.The stealth performance of diving equipment has a role in whether it can successfully carry out its mission.If the diving equipment is not able to be hidden in the sea,then it will not be able to complete the task assigned to it.Its stealth performance is mainly derived from the vibration generated in the operation of machinery and equipment,and the vibration has a great relationship with mechanical impedance.The base is an important part inside the diving equipment and can have an impact on the operation of the whole equipment.The impedance characteristics of the base play a great role in the stealth performance of the diving equipment.Therefore,the analysis of the impedance characteristics of the base and the study of optimal design have some practical application value.The specific research work in this paper is as follows:The finite element model of the base was established using finite element analysis software,and the mechanical impedance of the base was calculated and plotted according to reasonable steps.On this basis,the influence of the characteristic parameters on the mechanical impedance was analyzed by adjusting the characteristic parameters of the base structure,and a certain law was summarized.For the optimal design study of the base,the dimensional optimization of the base was carried out first.The dimensional optimization is divided into single-objective dimensional optimization and multi-objective dimensional optimization.The single-objective dimensional optimization reduces the thickness of the base panel by 30 mm,the thickness of the web by 11 mm,and the thickness of the ribs by 15 mm.The multi-objective dimensional optimization resulted in a 10 mm reduction in panel thickness,a 16 mm reduction in web thickness,and a 5 mm reduction in rib thickness of the base.Through dimensional optimization,all performance indicators of the base have been improved.The mechanical impedance value of the base as well as the impedance uniformity have been improved,and the overall weight of the base has been reduced somewhat,achieving the goal of dimensional optimization.For the topology optimization design of the base,the topology of the base ribs was first optimized to obtain ribs with better performance index.Secondly,the topology optimization of the base web was carried out,so that the through-hole diameter of the web was enlarged by a certain value,which served as a topology optimization.The topology optimization of the base ribs resulted in an 8.08% reduction in the total weight of the base,a 2.34% reduction in the impedance dispersion of the base,and an improvement in the mechanical impedance uniformity.The topology optimization of the base has a certain improvement on the mechanical impedance value of the base,which can have a positive impact on the vibration resistance of the base.In this paper,the impedance analysis and optimization design study are carried out for the internal base of diving equipment,mainly for size optimization and topology optimization,which provides a reference for the impedance optimization of ship base.