The effects of damping composite characteristics on maximizing modal damping ratio by topology optimization

Reducing vibrations in the structure can be performed by damping composite materials. Maximizing the modal damping ratio (MDR) as a physical property of these materials can be a good tool to deal with it which can be performed by the topology optimization (TO). This paper studies many characteristics of composite damping materials of constraining layer damping structures (CLD) that affect maximizing MDR by TO. Mainly, it pays attention to characteristics such as Rayleigh damping coefficients, loss factor, elasticity modulus, volume fraction and the thickness of the damping layer. The TO method used here is the moving iso-surface threshold approach (MIST) which was applied successfully to some optimization problems. For each case, an illustrative example is presented and results are compared together to show the effectiveness of applying the method on how different factors can influence the MDR and vibration reduction. Specifically, it shows that adding more damping material does not guarantee that vibration reduction is achieved. In addition, an increase of the constraining layer damping leads to less effectiveness of the approach in vibration reduction of the multiplayer plate.

کلیدواژه ها:

MDR ، topology optimization ، moving iso-surface threshold ، damping