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Length proportion design method of soft and hard pipe spliced pipeline

A technology of length ratio and design method, applied in the direction of computer-aided design, design optimization/simulation, calculation, etc., can solve the problems affecting the reliability of the pipeline system, accelerated damage of the soft and hard connecting pipeline, and parametric resonance, so as to avoid parametric resonance. phenomenon, effect of ensuring safety

Active Publication Date: 2018-02-13
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

However, it is precisely because of the low stiffness of this composite material pipe that it is more prone to parametric resonance when transporting pulsating fluids
Once parametric resonance occurs, it will lead to accelerated destruction of soft and hard connecting pipes, which will seriously affect the reliability of the piping system

Method used

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  • Length proportion design method of soft and hard pipe spliced pipeline
  • Length proportion design method of soft and hard pipe spliced pipeline
  • Length proportion design method of soft and hard pipe spliced pipeline

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Embodiment Construction

[0051]Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided in order to give a thorough understanding of embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. may be adopted. In other instances, well-known technical solutions have not bee...

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Abstract

The invention provides a length proportion design method of soft and hard pipe spliced pipeline, and relates to the technical field of dynamics stability analysis. The design method includes the steps: building a dynamics differential equation of a soft pipe and a dynamics differential equation of a hard pipe based on a dynamics model of the soft and hard pipe spliced pipeline; performing space discretization on the dynamics differential equations by an improved Galerkin method to obtain corresponding matrix equations, and assembling the matrix equations into a target equation of a unified time and space coordinate system; converting the target equation into a periodic coefficient linear ordinary differential state equation, and introducing monodromy matrixes into the periodic coefficientlinear ordinary differential state equation to obtain characteristic values of a plurality of monodromy matrixes; taking the characteristic values of the monodromy matrixes as Floquet characteristic multipliers, and determining the length proportion of the soft pipe to the hard pipe when any Floquet characteristic multiplier reaches a critical threshold value. The method can reduce and avoid parameter resonance of the soft and hard pipe spliced pipeline.

Description

technical field [0001] The present disclosure relates to the technical field of dynamic stability analysis, in particular to a method for designing the length ratio of soft-hard connecting pipelines. Background technique [0002] Soft and hard connecting pipes are widely used in aerospace, petrochemical, and nuclear industries, especially in the transition and connection parts of pumps or equipment inlets and outlets. The soft-hard connecting pipe is composed of a section of flexible hose and a section of hard metal pipe. When the pulsating fluid with a certain pressure flows through the soft-hard joint pipe, it will inevitably excite the vibration of the pipeline system; and when the flow rate, pulsation frequency and pulsation amplitude reach the critical value, the soft-hard joint pipe will Parametric resonance will occur, that is, the parametric resonance that occurs when the pulsation frequency of the negative stiffness term in the dynamic system is about twice the nat...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/13G06F30/20G06F2113/14
Inventor 岳珠峰李钱刘伟
Owner NORTHWESTERN POLYTECHNICAL UNIV
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