Experimental Study On Composite Thin-walled Cylindrical Shell Vibration Of Composite Materials

Cylindrical shell, with its own good geometry and processing for the production, and other characteristics, are widely used in ships, oil, aviation, machinery manufacturing and other industrial sectors. At present, a single material cylindrical shell has failed to meet the needs of people, composite materials have the higher specific stiffness and specific strength, and have been playing an irreplaceable role in the building of the national economy. In actual vibration impacts a large number of composite cylindrical shell, and the vibration directly impact on the structure of the dynamic characteristics. Thus composite shell on the vibration characteristics is very important.This article from the perspective of experimental study, according to the present experimental studies situation at home and abroad and under the condition of the current experiment, a experimental device is designed. The thin-walled cylindrical shell vibration of composite materials is studied based on theoretical research, and compares with the theory. Firstly sweep the cylindrical shell and identify the general scope of natural frequency of cylindrical shell, and then, make the excited force vibrated in the vicinity of natural frequency, and measure carefully; collect data, analyse and draw the corresponding amplitude and frequency characteristic curve; determine the size of the natural frequency; then combining the theoretical value, validate nodal diamcters and calculate modal damping ratio under different natural frequencyIn addition, the dynamic modulus of elasticity of composite materials is the variable. Through experiments we can solve the problem that dynamic modulus of elasticity of composite materials changes with the change of excited frequency, and we can get the mathematical relationship of modulus of elasticity and excited frequency, and then draw up the curve between the two.