无粘流
机械
颤振
轴对称性
流量(数学)
流离失所(心理学)
静力学
张力(地质)
管道流量
结构工程
物理
工程类
经典力学
空气动力学
湍流
心理学
力矩(物理)
心理治疗师
作者
A. K. Misra,Michael P. Paı̈doussis,K.S. Van
标识
DOI:10.1016/s0889-9746(88)80010-0
摘要
The paper treats the effect of internal flow on the statics, dynamics and stability of extensible curved pipes. The cases of pipes clamped at both ends and pipes clamped at the upstream end but free to slide axially at the downstream end are considered. For pipes clamped at both ends, the stressed shape is symmetrical for inviscid flow but asymmetrical for viscous flow; there is also a significant difference between the steady-state combined tension and pressure force calculated for the two flows. The stability behaviour of a clamped-clamped curved pipe, however, does not depend on whether viscosity is taken into account or not; the natural frequencies do not change much with increasing flow velocity and the system thus never loses stability. This conclusion is consistent with that obtained in the first part of this work using a modified inextensible theory and with the predictions of other extensible theories. There is, however, a substantial change in the stability behaviour if the downstream end of the pipe is allowed to slide axially, even though it is still clamped as far as transverse displacement is concerned. The pipe then loses stability by flutter at sufficiently high flow velocities.
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