The Vibration Power Flow Performance Of Thin Plates

With the rapid development of modern industry, it puts forward to higher requirements on aircraft, submarines and naval craft and other structures, such as structural strength, weight, vibration and noise etc. Composite materials because of its high strength, stiffness and fatigue resistance, excellent performance design, which makes widely application of laminated structure of composite material component.In engineering application, the laminated composite plates and other thin plates will be certainly excited to vibrate, the vibration of laminated structure will be easily cause the entire aviation structure damaged, vibration power flow is an ideal physical quantity to reflect the vibration energy transfer in the structure, so researching vibration power flow characteristics of composite structure, has the important guiding significance to reduction the vibration and noise and damage detection of the composite structure in aviation and aerospace fields. This paper mainly focuses on theoretical study the vibration power flow characteristics of composite laminate structure and other thin plates.Firstly, the numerical of vibration power flow solution of thin plate structure were calculated. Based on the basic assumptions, established the finite element model of thin plate structure. Introducing the concept of the vibration power flow and focuses them, stiffness matrix and mass matrix about the rectangular element is solved, and selected a shell element as an example, the unit of structure intensity is presented, integrating structural intensity in the plate thickness direction, so we could get the numerical solutions of structure vibration power flow. After calculating the power flow solutions, and draw out the vector field distribution of a few order frequency power flow. To realize visualization of vibration energy distribution in plate structure surface and propagation, and comparative analysis of power with four edges simply supported and clamped boundary conditions of the flow vector field distribution.Secondly, with composite laminated structure as the research object, based on the first order shear theory to establish different from the finite element model of thin plate structure. Detailed introduced the process to calculate the dynamic response oflaminated structure using modal superposition method, derived formulas such as displacement and internal forces and related parameters of computing power flow.Finally, the vibration power flow characteristic of the composite laminated structure under the forced vibration has been solved by numerical method.The natural frequency of laminated structure of some examples were calculated by using MATLAB software.The results show that: the formulations derived and programs written in this paper is reliable.Then compared respectively in the four edges simply supported and clamped conditions, changing the incentives point position and effect of laminated panel orientation angle, width-depth ratio and elastic modulus ratio of structural parameters on the vibration power flow numerical results.The results showed that: the effect of fiber panel orientation angle and width-depth ratio of the vibration power flow is obvious.