Development and Calculation-experimental Analysis of Pressure Pulsations and Dynamic Forces Occurrence Models in the Expansion Joints of Pipelines with Fluid

摘要

This article is a continuation of papers [1-3], concerning expansion-joints vibration deformation in pipelines with a fluid. Physical models and analytical dependences which describe the occurrence of pressure pulsations and dynamic forces determining vibration transmission through expansion joints in a wide frequency range up to hundreds of hertz have been developed and experimentally verified. It has been shown that the pressure pulsation and dynamic forces arising in the expansion joint are connected with a quadratic dependence on the oscillation frequency and may grow because of the increasing frequency by three - four orders of magnitude over a wide frequency range as compared to low frequencies. Vibration transfer through an expansion joint is characterized by its transfer vibration rigidity which also increases as square of the disturbance frequency which may serve as a diagnostic criterion of such rigidity model in an expansion joint during its experimental research. The suggestions on the direction of further research to reduce pressure pulsations, dynamic forces and vibration transmission through expansion joints over a wide frequency range have been made.