Abstract
The paper considers the dynamic stability of submerged pipelines with denudation and sagging depending on their stiffness and the river flow rate. The hydrodynamic force frequency and natural vibrations of the pipeline are calculated at the actual and critical length of the pipeline sagging. It is shown that the frequency of the external hydrodynamic force applied to the sagged pipeline with the length corresponding to the critical, coincides with the frequency of natural vibrations. It is found that the loss of stability of submerged pipelines occurs in the resonant region of the pipeline vibration due to the increased variable hydrodynamic force.
Highlights
Показано, что потеря устойчивости подводных переходов происходит в резонансной области колебания трубопровода за счет усиливающего действия переменной гидродинамической силы
The paper considers the dynamic stability of submerged pipelines with denudation and sagging depending on their stiffness and the river flow rate
It is shown that the frequency of the external hydrodynamic force applied to the sagged pipeline with the length corresponding to the critical, coincides with the frequency of natural vibrations
Summary
The paper considers the dynamic stability of submerged pipelines with denudation and sagging depending on their stiffness and the river flow rate. It is shown that the frequency of the external hydrodynamic force applied to the sagged pipeline with the length corresponding to the critical, coincides with the frequency of natural vibrations. It is found that the loss of stability of submerged pipelines occurs in the resonant region of the pipeline vibration due to the increased variable hydrodynamic force. Динамическая устойчивость речных подводных переходов магистральных трубопроводов при наличии оголений и провисов определяется двумя видами сил: внешними, вызванными потоком воды, обтекающей трубу (воздействие лобового сопротивления и подъемной силы), и внутренними – пульсацией рабочего давления в трубе, которые зависят от упругости, инерции и сопротивления (демпфирования) трубопровода. Рупр прямо пропорциональна прогибу трубопровода yпр и кольцевой жесткости трубы Sr : Рупр Sr yпр , Sr. При натекании потока воды трубопровод находится под воздействием внешней поперечной гидродинамической силы: Рп
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