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The vibration of the cylindrical tower tank was analyzed in the finite element method. The natural frequencies and modes of the cylindrical tower tank in the condition of different thickness and crack, etc. were obtained and influence rules were analyzed. This paper provides the basic research for identifying the crack damage of tower tank through vibration performance. Introduction Vertical cylindrical tower tank is widely used in various industries. Crack is found in the process of production or use sometimes. The presence and extension of these cracks can destroy the integrity of the structure and reduce the stiffness and strength of tower tank, then causing major accidents. The structure of the tower tank should be diagnosed and evaluated timely to understand if exists crack, the location of the crack, crack size. Then ensuring the normal use becomes necessary technology in engineer. The Establishment of Calculation Model The tank diameter D=2200mm, height L=3650mm, the height of top shell f=350mm. Cracks can be divided into axial cracks and circular cracks to study and seven axial cracks and seven circular cracks were set up. The length of cracks is 500mm. Figure 1. The mashing of finite element model. SHELL63 element is adopted, Shell thickness is 20 mm, material of tower tank is carbon steel, elasticity modulus is 200GPa, poisson ratio is 0.3 and material density value is 7800 kg/m3. This paper studies two kinds of constraint conditions. The constraint I: bottom surface is completely fixed. The constraint II: The four symmetrical points are fixed at the bottom edge. Modal Calculation of Different Constraints and Cracks According to solve the vibration characteristics of the tower tank, natural frequency and vibration mode figure of the cracked tower tank included in the selected location and length of cracks can be obtained. Because the selected vertical cylindrical tower tank is symmetrical completely, the natural frequency of every two order is the same. So 4 order natural frequency and mode of vibration are taken to study, they are from one, three, five and seven order. Considering the space, the conditions of having no crack and

Analysis of Crack Influence Vibration Characteristics of Tower Tank