Vibration Analysis of a Rotary Smart Sandwich Blade with Electrorheological Core

The vibration behavior of a three-layer smart rotary blade with an electrorheological (ER) core is investigated in this paper. The blade consists of an electrorheological elastomer core sandwiched between two elastic layers. The structural model is developed based on the Euler-Bernoulli beam theory for the elastic layers. Additionally, the viscoelastic theory is considered for the middle layer (electrorheological core) of the three-layered blade. Using the energy approach, the potential and kinetic energy equations for each layer are formulated based on the longitudinal and transverse deformations and their temporal derivatives. The equations of motion are then derived using Lagrange's theory. The Ritz method is employed to obtain the modal form of the governing equations. The natural frequency and loss factor of a blade with a specified smart core are validated by comparison with existing references. Finally, the effects of various parameters on the natural frequencies and loss factors of the blade are analyzed. The results indicate that electric field intensity, rotational speed, hub radius, blade thickness, setting angle, and the type of electrorheological fluid significantly influence the natural frequencies and loss factors of the smart sandwich blade with an electrorheological core.

کلیدواژه ها:

Free vibration ، Smart Sandwich Blade ، Electrorheological fluid ، Natural frequency ، Damping factor