考虑温度应力下深海输油立管动力特性及响应研究

考虑深海输油立管管内外温差产生的温度应力以及管内流体流动和管外海洋环境荷载的共同作用,建立了深海输油立管振动微分方程,采用有限元法对输油立管动力特性及动力响应进行求解,并将考虑温度应力及不考虑温度应力的立管动力特性及在波浪作用下的立管动力响应进行了对比。结果表明,对于动力特性,温度应力的存在会使得立管自振频率降低;对于动力响应,会使得波浪作用下动力响应幅值增强而频率略有降低,易引起立管的疲劳破坏。

Dynamic character and dynamic response of deepwater marine riser considering temperature stress

Considering the temperature stress induced by temperature difference between inside and outerside the marine riser as well as the joint effect of the internal flowing fluid and the external marine environmental loads,the differential equation of marine riser in the wave is established,then the finite element mothod is used to solve the dyanmic character and dynamic response,finally the comparisons are made of the marine riser′s dyanmic character and dynamic response between considering and igonoring the temperature stress.The results indicate that: for the dynamic character,the temperatrue stress will make the nature frequency decrease;for the dynamic response,it will increase the response magnitude and decrease the reponse frequency,leading to the fatigue damage.