Abstract
Due to the medium and small damping characteristics of the hard coating compared with viscoelastic materials, the classical modal strain energy (CMSE) method cannot be applied to the prediction of damping characteristics of hard-coating composite structure directly. In this study, the CMSE method was modified in order to be suitable for this calculation, and then the damping optimization of the hard-coating thin plate was carried out. First, the solution formula of modified modal strain energy (MMSE) method was derived and the relevant calculation procedure was proposed. Then, based on the principle that depositing the hard coating on the locations where modal strain energy is higher, the damping optimization method and procedure were presented. Next, a cantilever thin plate coated with Mg-Al hard coating was taken as an example to demonstrate the solution of the modal damping parameters for the composite plate. Finally, the optimization of coating location was studied according to the proposed method for the cantilever thin plate, and the effect of the coating area on the damping characteristics of hard-coating plate was also discussed.
Highlights
Because hard coating has the advantages of high hardness, high-temperature resistance, and anti-corrosion, it has been widely used in aircraft, aerospace, vehicles, machine tools, and other fields [1,2,3]
This assumption is reasonable for the viscoelastic composite structure, because the loss factor of viscoelastic material is much larger than the internal damping of metal material, the change of the complex stiffness matrix is small and acceptable
An important conclusion can be drawn, and that is, the damping effect of the composite plate is not sensitive to the coating area. This conclusion is very favorable for vibration reduction using hard coating, which indicates that only choosing the zone with higher modal strain energy to deposit hard coating material, rather than paying close attention to the coating area, can bring a satisfactory damping effect
Summary
Because hard coating has the advantages of high hardness, high-temperature resistance, and anti-corrosion, it has been widely used in aircraft, aerospace, vehicles, machine tools, and other fields [1,2,3]. The loss factor of hard coating is larger than that of metal but far less than that of viscoelastic material [11] For this case, the CMSE method is no longer applicable for the prediction of the damping properties of hard‐coating. The CMSE method generally certain contribution to the solution of these eigenvectors, this computation pattern can introduce only real part of the complex stiffness matrix to calculate errorsuses for the damping prediction of the composite structure [12]. Because the imaginary part of hard‐coating damping optimization needs to be complex stiffness matrix has certain contribution to the solution of these eigenvectors, this computation involved, that is, the hard coating should be coated on the proper locations of the structure to achieve pattern can introduce errors foroptimization the dampingofprediction of the composite structure [12]. Important conclusions were acquired from the study and they are listed in Conclusions
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
