Use of Vibration Isolation Systems with Negative Stiffness on the Basis of Special Shaped Guides to Reduce Pump Piping Vibration

Abstract

The paper is devoted to the problem of reduction of the vibration level of pipelines, caused by resonance with the disturbing frequency of pumping units. Each case of the occurrence of pipeline vibrations requires a careful and qualified analysis, because no universal methods for reducing the vibration of technological pipelines have been developed. It is offered to use vibration isolators based on the special shaped with negative stiffness area for vibration isolation. A pipeline in this case acts as a stabilizer for a vibration isolator with negative stiffness. The combination of these two elements in a particular area force characteristic “pipeline—vibration isolator” system becomes flat, thereby providing a reduction of its stiffness and thus natural frequencies. Analytical calculations have been made to prove the effectiveness of the proposed solution. Thus, in the case considered in the paper, the natural frequency of the pipeline oscillations is reduced from 33.33 to 9.5 Hz. A passive vibration isolator based on an elastic element moving along the guides of the design form perpendicular to their axis allows creating the force characteristics of a given shape that are necessary for vibration protection in each case.