Analysis And Test Verification Of Vibration Isolation Characteristics Of Ship’s Typical Porous Structure

With the development of high-speed and large-scale ships,the traditional ship vibration isolation technology is difficult to meet the requirements of ship vibration isolation under the new situation.In this paper,the porous structure is introduced to solve the problem of vibration isolation of ship power equipment by using its vibration isolation,light weight and designability,breaking through the limitation of excessive volume and mass of the traditional ship vibration isolation system.In this paper,the combination of finite element calculation and experimental test is used to study the static and dynamic properties of three commonly used porous structures,and preliminarily explore their application in marine vibration isolation.The main research contents are as follows:In this paper,a step-by-step modeling design method of porous vibration isolation structures for ships from cells to support bases is proposed,which simplifies the modeling and analysis complexity of support bases.Taking the strength and stiffness of the structure as the constraints,and the vibration level drop of the base as the key performance index,the static analysis and frequency response analysis of the structure are carried out to obtain the parameter ranges of wall thickness,angle and number of layers.In a typical marine dynamic excitation frequency range,the numerical simulation and comparative analysis of three typical porous structures of square,hexagonal honeycomb and concave honeycomb are carried out.For the vibration isolation system with concave honeycomb porous structure,this paper focuses on the influence of geometric parameters on the stiffness,strength and vibration isolation performance of the vibration isolation system,and obtains the influence curves of cell wall thickness and angle on the strength and vibration level drop of the vibration isolation system.The research shows that the angle has little effect on the strength and stiffness of the concave honeycomb vibration isolation system,but has a great influence on the vibration isolation effect of the vibration isolation system.In engineering,on the basis of ensuring the strength and stiffness of the system,the cell angle between θ∈[-35°,-30°]can be selected as much as possible to obtain better vibration isolation effect.In this paper,two vibration isolation performance test platforms are built,and fixedfrequency vibration tests are carried out on the porous structure vibration isolation system with different angles at the working frequency of a marine plunger pump,which verifies the effectiveness of the concave honeycomb porous structure vibration isolation system.It is shown that the inward concave honeycomb vibration isolation system with an angle of-30°at three specific operating frequencies has the best vibration isolation effect.In this paper,the parameter research of porous structure is helpful to improve the overall vibration isolation design level of ship power equipment.