In this research, in order to investigate the effect of the piezoelectric patch which is used as a sensor or actuator in rotating flexible structures such as a helicopter blade, the free vibrations of the rotating rectangular sheet with and without the piezoelectric patch have been presented. First-order shear deformation theory is considered for plate displacement and piezoelectric field. Considering the effect of Coriolis acceleration, centrifugal acceleration and centrifugal in-plane forces, the equations of motion are derived from Hamilton's principle and the electromechanical couple equation is obtained from Maxwell's equation. For piezoelectric, two electrical conditions, open circuit and closed circuit, which are used in sensors and actuators, respectively, have been considered. The equations are discretized with the help of the numerical method of generalized DIFFERENTIAL squares and the matrices of inertia mass, eccentricity, Coriolis and stiffness matrix are obtained. Natural frequency values for beam and rotating plate have been compared in Abaqus software. Also, the values obtained from the numerical solution in MATLAB have been verified with articles and ABAQUS, which have high accuracy. The effect of parameters such as hub radius, rotation speed, sheet thickness, aspect ratio, piezoelectric patch thickness and applied voltage on the natural frequency of the system has also been investigated.

From ancient era silk production and silk weaving have been of main arts of china and silk textiles have been used to decorate walls and temples in addition to producing clothes. At this time, the effect of religions especially Buddhism that has growth in this country rightfully, is sensible on these elegant textiles clearly. This article which has written using analytical and descriptive method, has analyzed Buddhism phenomenon and image and the manner of their execution on silk of China. Survey of Buddhism phenomenon on silk weaving of China, introducing us more about the main part of religion and art of China that form the main base of this article.