Sandwich materials are widely used in marine structures because of their excellent comprehensive properties.However,the solution of bimodulus is challenging.Therefore,the theoretical and numerical approximation method...Sandwich materials are widely used in marine structures because of their excellent comprehensive properties.However,the solution of bimodulus is challenging.Therefore,the theoretical and numerical approximation methods for the analysis of load-bearing characteristics of bimodulus sandwich structures are put forward comprehensively in this paper.Based on the superposition principle,a theoretical method for calculating the neutral surface position of bimodulus sandwich plate is derived,and the corresponding bending control equation is obtained.The proposed theoretical approximation method can fully consider the sawtooth deformation between the plate and the core,as well as the sawtooth deformation inside the core at the tension–compression interface.Moreover,a finite element model is established for complex sandwich structures to analyze the influence of bimodulus.Numerical examples show that the theoretical approximation model proposed in this paper has higher calculation accuracy.展开更多
Vibration at the stern area is generally the most severe of the entire ship hull,which has always attracted special attention by ship designers and researchers.With reference to a real ship structural layout,a scaled ...Vibration at the stern area is generally the most severe of the entire ship hull,which has always attracted special attention by ship designers and researchers.With reference to a real ship structural layout,a scaled stern model of steel structure was innovatively designed to carry out the mode and response tests.Corresponding finite element(FE)model representing the tested structure was established for verification of commonly-used calculation methods of modal parameters and response.Good agreement between experimental and numerical results demonstrates the credibility of FE method,and some key points of modeling and calculating are discussed.In addition,with the combination of the experiment and calculation,some vibration characteristics of ship stern structure are summarized for future ship design guideline.展开更多
基金supported by the National Natural Science Foundation of China(51979213).
文摘Sandwich materials are widely used in marine structures because of their excellent comprehensive properties.However,the solution of bimodulus is challenging.Therefore,the theoretical and numerical approximation methods for the analysis of load-bearing characteristics of bimodulus sandwich structures are put forward comprehensively in this paper.Based on the superposition principle,a theoretical method for calculating the neutral surface position of bimodulus sandwich plate is derived,and the corresponding bending control equation is obtained.The proposed theoretical approximation method can fully consider the sawtooth deformation between the plate and the core,as well as the sawtooth deformation inside the core at the tension–compression interface.Moreover,a finite element model is established for complex sandwich structures to analyze the influence of bimodulus.Numerical examples show that the theoretical approximation model proposed in this paper has higher calculation accuracy.
文摘Vibration at the stern area is generally the most severe of the entire ship hull,which has always attracted special attention by ship designers and researchers.With reference to a real ship structural layout,a scaled stern model of steel structure was innovatively designed to carry out the mode and response tests.Corresponding finite element(FE)model representing the tested structure was established for verification of commonly-used calculation methods of modal parameters and response.Good agreement between experimental and numerical results demonstrates the credibility of FE method,and some key points of modeling and calculating are discussed.In addition,with the combination of the experiment and calculation,some vibration characteristics of ship stern structure are summarized for future ship design guideline.
