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Fluid solid coupling dynamic characteristic prediction method for pipeline system

A technology of dynamic characteristics and pipeline system, which is applied in the field of prediction of fluid-solid coupling dynamic characteristics, can solve problems such as unstable prediction results, difficult modular programming prediction, calculation value overflow, etc., so as to facilitate programming calculation and ensure prediction Precision, the effect of eliminating numeric overflow

Active Publication Date: 2016-01-20
NO 719 RES INST CHINA SHIPBUILDING IND
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Problems solved by technology

Liu and Li (LiuGongmin, LiYanhua. Vibration analysis of liquid-filled pipelines with elastic constraints [J]. Journal of Sound and Vibration, 2011, 330(13): 3166-3181.) derived 12 unary fourth-order constants based on the fluid-solid coupling dynamics of the pipeline system. Differential equations and two one-variable second-order ordinary differential equations, and then solved to obtain the frequency-domain analytical solution of the pipeline system. This method can reduce the calculation error caused by matrix changes to a certain extent. The above-mentioned improvement measures can be achieved in a certain To some extent, the transfer matrix has improved the prediction accuracy and stability of the prediction results of the fluid-solid coupling dynamic characteristics of large-scale complex piping systems, but these methods have no advantages in calculating the fluid-solid coupling response of the piping system, and it is difficult to achieve Modular Programming Predictions
[0005] At present, the process of using the transfer matrix method to predict the dynamics of the pipeline system at home and abroad is: firstly analyze the composition of the pipeline system, and then bring the mathematical model of each pipeline component into the pipeline system, and according to the connection of each pipeline component The balance and transfer relationship of the pipeline system are combined into the form of the overall transfer matrix, and then the dynamic characteristics of the pipeline system are predicted by using the definite solution conditions. However, this method will overflow the calculation value when predicting the fluid-structure coupling vibration response of the pipeline system. and the phenomenon of unstable prediction results

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  • Fluid solid coupling dynamic characteristic prediction method for pipeline system
  • Fluid solid coupling dynamic characteristic prediction method for pipeline system
  • Fluid solid coupling dynamic characteristic prediction method for pipeline system

Examples

Experimental program
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Effect test

Embodiment 1

[0058] Such as figure 2 As shown, a long water-filled pipeline with free ends, the characteristic parameters of the pipeline system are shown in Table 1, and the unit excitation along the y direction is applied at the end of the pipeline.

[0059] Table 1 Pipeline structure and characteristic parameters of internal fluid

[0060]

[0061] If the pipeline is calculated as a straight pipe as a whole (that is, a unit body), the calculated fluid-solid coupling response curve at end B is as follows image 3 As shown, after 255Hz, the results of the lateral vibration response of the pipeline become unstable.

[0062] image 3 The instability phenomenon is due to the fact that the characteristic length of the calculation unit body exceeds the maximum characteristic length specified by formula (1) or formula (2), according to image 3 , if the analysis frequency range is set to 0-1000Hz, then the upper limit frequency of the corresponding analysis is 1000Hz, according to the fo...

Embodiment 2

[0064] In this example Figure 5 The complex space pipeline system shown is the implementation object. The basic parameters of the pipeline structure material are: the elastic modulus is 200GPa, the Poisson’s ratio is 0.3, and the density is 7800kg / m 3 . Each boundary end is fixedly supported, each elastic support is suspended vertically (x direction), and the stiffness is 6.78×10 3 N / m. In the figure, 1 is the gate valve of DN100, 2 is the stop valve of DN100, 3 is the gate valve of DN65, and 4 is the stop valve of DN65. N 1 , N 2 , N 3 Springs with six degrees of freedom are connected at three places, and the stiffness in each direction is 1×10 9 N / m (approximate fixed support boundary condition), N 4 A linear spring with three degrees of freedom is connected at , and the spring stiffness in each direction is 8×10 6 N / m, the minimum wavelength of the pipe wall bending wave predicted by the piping system is 17m.

[0065] Apply excitation at the branch point, arbitrar...

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Abstract

The invention relates to the field of fluid solid coupling prediction, and particularly relates to a fluid solid coupling dynamic characteristic prediction method for a pipeline system. The method comprises steps: according to attributes of each pipeline element in the pipeline system, the pipeline system is dispersed into a straight pipe element type, an elbow element type and a pipeline accessory element type; according to the types of the dispersed pipeline elements, a field transfer fluid solid coupling matrix or a point transfer fluid solid coupling matrix corresponding to each pipeline element is built; the dispersed pipeline system is recombined into a plurality of transfer matrix units, and according to the minimal pipe wall bending wave wavelength predicted by the pipeline system or a predicted upper limit frequency, the maximal characteristic length of the transfer matrix units is calculated; and fluid solid coupling dynamic characteristics at any position of the pipeline system are predicted. Problems of numerical overflow and an instable prediction result for the pipeline system fluid solid coupling dynamics can be eliminated, the prediction process is simple and convenient, programming calculation is facilitated extremely, and the prediction precision is high.

Description

technical field [0001] The present invention relates to a method for predicting fluid-solid coupling dynamics characteristics of a pipeline system, and more specifically, the present invention relates to a fluid-solid coupling dynamics problem for large-scale complex pipeline systems containing relatively large field transfer pipeline components predict. Background technique [0002] Large and complex pipeline systems are widely used in many fields such as shipbuilding and marine engineering, petrochemical industry, energy and electric power industry, etc., due to internal excitations such as pumps, valves, branch pipelines and external excitations such as foundation or decking vibration in the pipeline system, As a result, the vibration of the pipeline structure and the fluid in the pipeline will be induced, and the vibration of the pipeline structure and the fluid will also be coupled with each other to generate fluid-structure interaction (FSI) vibration. The vibration e...

Claims

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Application Information

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IPC IPC(8): G06Q10/04
Inventor 李帅军姚世卫李华峰郑明明
Owner NO 719 RES INST CHINA SHIPBUILDING IND
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