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Uncertainty analysis method for frequency response function of hoop-pipeline system

A pipeline system and frequency response function technology, applied in complex mathematical operations, electrical digital data processing, special data processing applications, etc. High accuracy and high efficiency of calculation results

Active Publication Date: 2019-12-13
NORTHEASTERN UNIV
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Problems solved by technology

[0007] In summary, the uncertainty analysis method has been applied in many research fields, but there are relatively few studies on the uncertainty of the clamp-pipeline system

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  • Uncertainty analysis method for frequency response function of hoop-pipeline system
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  • Uncertainty analysis method for frequency response function of hoop-pipeline system

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Embodiment Construction

[0066] In order to better explain the present invention and facilitate understanding, the present invention will be described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0067] The present invention provides an uncertainty analysis method for the frequency response function of the clamp-pipeline system, such as figure 1 shown, including the following steps:

[0068] A1. Based on the beam element model and the spring model, establish the finite element model of the clamp-pipeline system.

[0069] The physical dimensions of the clamp-pipeline system are shown in the figure figure 2 As shown, the parameters are shown in Table 1. Each node has 4 degrees of freedom, which are the translational displacement and angular displacement in the x direction and z direction respectively. image 3 The shown Euler beam model builds the pipeline, and the following is obtained: Figure 4 Finite element model of the clamp-pipe system shown. ...

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Abstract

The invention belongs to the technical field of mechanical dynamics, and particularly relates to an uncertainty analysis method for frequency response function of a hoop-pipeline system. The method comprises the following steps: A1, establishing a finite element model of a hoop-pipeline system based on a beam element model and a spring model; A2, taking the pre-obtained uncertain interval of the hoop rigidity as an interval variable, applying the interval variable to a finite element model in the hoop-pipeline system, and obtaining the uncertain interval of the frequency response function of the hoop-pipeline system by utilizing a Chebyshev polynomial approximation method. The uncertainty interval of the frequency response function of the hoop-pipeline system obtained by the method is highin accuracy and high in efficiency.

Description

technical field [0001] The invention belongs to the technical field of mechanical dynamics, and in particular relates to an uncertainty analysis method for the frequency response function of a clamp-pipeline system. Background technique [0002] In an aero-engine, the piping system is composed of many complex pipes, which are fixed on the aero-engine by clamps. The clamp-pipeline system is an important part of fluid transportation such as lubricating oil, fuel oil, hydraulic oil, etc., and has been widely used in the aerospace industry. The failure of the pipeline system has become one of the main problems causing the failure of aeroengines. Such failures can be reduced if the uncertainty interval for the vibration of the clamp-pipe system can be estimated from the external conditions. [0003] Uncertainty methods can be roughly divided into three categories: probabilistic uncertainty methods, fuzzy uncertainty methods and interval uncertainty methods. [0004] The resear...

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Application Information

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IPC IPC(8): G06F17/50G06F17/16
CPCG06F17/16
Inventor 马辉郭旭民曾劲罗忠李朝峰
Owner NORTHEASTERN UNIV
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