Abstract
Loss factor is one of the most significant parameters of Statistical Energy Analysis (SEA) which represents the damping loss characteristics of a system and indicates the ability of its vibration energy consumption. In order to estimate it, the power input method (PIM) and the impulse response decay method (IRDM) have become widely used especially when the object of study is made of Fiber Reinforced Plastics (FRP) of which dynamic interaction is really complicated. Numerical simulation is also applied to analyze the loss factor of the spring-damping-system with single degree of freedom (SDOF) using MATLAB to introduce the identification procedure of PIM and IRDM. With the comparison of the methods, the analytical study indicates these techniques are effective for the estimation of loss factor. This paper focuses on an experimental approach to get the SEA loss factor of FRP plate and the test investigations are performed in detail. The requirements and limitations of each method applied are discussed and PIM is a better solution dealing with this kind of the composite material. The loss factor of test specimen is obtained to provide a valuable reference for the prediction and control of vibration and noise of yachts with SEA.
Highlights
Modern yachts are usually manufactured with the material of fiber reinforced plastics (FRP) which possesses the advantage of light, stiff, conductive and corrosion resisting
The complex structure of Fiber Reinforced Plastics (FRP) plate leads to the fact that investigating the loss factor analytically is very difficult
Numerical simulation of spring-mass system with power input method (PIM) and impulse response decay method (IRDM) is carried out to be in comparison and the analytical study indicates the availability of estimating the loss factors by these methods
Summary
Modern yachts are usually manufactured with the material of fiber reinforced plastics (FRP) which possesses the advantage of light, stiff, conductive and corrosion resisting. Statistical Energy Analysis (SEA) has become a powerful way of solving the problem above since it was originally and systematically mentioned by Lyon in 1975 [1] This method could predict the averaged response levels of a subsystem in view of energy with relative accuracy. Two widely-used techniques of different kinds (PIM and IRDM) are taken to estimate the loss factor for FPR plate of yachts. Numerical simulation of spring-mass system with PIM and IRDM is carried out to be in comparison and the analytical study indicates the availability of estimating the loss factors by these methods. Experimental setups and procedures are introduced in detail and the differences and limitations of each method used for estimation are discussed which could be beneficial to the study of the prediction and analysis of complex structures made of the composite materials
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