Experimental investigation of an active control system for vibration a pipe conveying fluid.

Vibration control is achieved by increasing the pressure of the hydraulic damper through a differential pressure gauge that connects to the main pipe, which in turn relates to the electric control valve where the amount of pressure coming out of this valve can be controlled by differential pressure gauge. Thus the hydraulic damper pressure and vibration inside the pipe are controlled. This was done in an actual water pumping station. The operational conditions of that station are taken into account in terms of the pressure generated and the flow rate at different times from the peak demand to the lowest consumption. A damping system is manufactured and connected to reduce vibrations. The normal frequency is measured for several types of fixations, and for the different circumstances in the experimental way. The results are compared with the results calculated by the theoretical method where it is found that the rate of convergence of results is very good and the rate is not exceeding 11.539%. In conclusion, the results have shown that the addition of the hydraulic damper increases the amount of natural frequency of the pipes and thus reduces the amount of response, which leads to a marked increase in the stability of the pipes during the flow. In addition, it is possible to find the imaginary frequency that indicates the stability of the pipes. The results have shown that the imaginary frequency can be reduced (increase stability) by adding a vibration damper to the piping system. [ABSTRACT FROM AUTHOR]