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The main purpose of this paper is to examine some practical aspects of a Dsection that are related with flow induced vibration. In this work, the first considerable thing that will be covered is the effect of various flow velocities on geometrical shapes and specifically on the DSection. Therefore, the geometrical properties of shape and its dimensions are very useful to find the value of susceptibility of material to withstand external stress. On the other hand, Young’s modulus could have a big effect on the body excitation, the actual geometrical properties of body, which are consisted of one degree of freedom are m= 0.7438032 Kg, K= 1144.8641 N/m, the natural frequency 4.219 rad/sec, and ζ = 0.00183. The model was developed for one degree of freedom aero dynamic galloping. This model is useful for analysing of elastic Dstructure, which was made from polystyrene (C8H8) n and the steel, exposed to various flow velocities where the Dsection was put in various attack angles (0 , 45, 90, 135, 180, and then 0)0 in front of the wind tunnel. Whereas the derivation of the equation of motion of the Dsection is the other worthwhile thing because it might be used to simulate the system in the future. The experimental results of the Dsection and discussions will be done on some response curves which will be simulated in different ways.

Exposure the System of Polystyrene and the Steel to Various Flow Velocities and Finding its Equation of Motion