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Flaring conduit assembly sealing performance prediction method

A prediction method, assembly and sealing technology, applied in special data processing applications, instruments, electrical and digital data processing, etc., to achieve the effect of overcoming the inconsistency between simulation results and actual results

Active Publication Date: 2021-11-30
CHENGDU AIRCRAFT INDUSTRY GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, problems such as how to accurately define the stress value and the influence of stress distribution on the sealing performance and how to measure the stress value with low cost and high efficiency have not been resolved.

Method used

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  • Flaring conduit assembly sealing performance prediction method
  • Flaring conduit assembly sealing performance prediction method
  • Flaring conduit assembly sealing performance prediction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] A method for predicting the assembly tightness of flared conduits, which calculates the minimum pressure value P of the sealing surface when a specific conduit with a specific diameter and material is sealed; The corresponding rated installation moment in -1 is used as the input of external force, and the finite element simulation calculation of the installation process is carried out, and the minimum pressure value P' of the sealing surface when the actual conduit is sealed is obtained; when P'≥P, it indicates that the installation of the actual conduit in this state The sealing effect is good, and the leakage probability is low. When P'≤P, it indicates that there is a risk of leakage in the actual installation of the conduit in this state.

[0091] The invention calculates the minimum pressure value of the sealing surface when the conduit with a specific diameter and a specific material is sealed by comparing tests and simulations. Then, according to the actual pre-as...

Embodiment 2

[0093] This embodiment is optimized on the basis of Embodiment 1, specifically comprising the following steps:

[0094] Step S100, using experiments to determine the reference torque and assembly error value of a specific conduit with a specific diameter and a specific material:

[0095] Step S200, use simulation to extract the coordinates of the taper surface nodes of the specific conduit and the list of corresponding pressure values: establish a digital model of the conduit based on the conduit shape, and establish a simulation model of the assembly process based on the reference torque and assembly error value in step S100; use abaqus The software conducts simulation experiments, and exports the node coordinates of the taper surface of the specific conduit and the list of corresponding pressure values;

[0096] Step S300, determining the minimum pressure of the conical surface of the pipe joint of the specific conduit under the premise of ensuring the sealing performance: d...

Embodiment 3

[0134] This embodiment is optimized on the basis of Embodiment 1, specifically comprising the following steps:

[0135] Step S100, using experiments to determine the reference torque and assembly error value of a specific conduit with a specific diameter and a specific material:

[0136] Such as figure 1 As shown in , select a specific pipe with a specific diameter and a specific material for the installation test, select the installation error, and increase the installation torque step by step until the pipe does not leak, record the reference torque and assembly error value at this time;

[0137] Step S200, use simulation to extract the coordinates of the taper surface nodes of the specific conduit and the list of corresponding pressure values: establish a digital model of the conduit based on the conduit shape, and establish a simulation model of the assembly process based on the reference torque and assembly error value in step S100; use abaqus The software conducts simul...

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Abstract

The invention discloses a flaring conduit assembly sealing performance prediction method. The method comprises the following steps: calculating a minimum pressure value P of a sealing surface when a specific conduit which has a specific diameter and is made of a specific material is sealed; then, according to an assembly error value and conduit appearance characteristic parameters in an actual conduit assembly environment, taking a corresponding rated installation torque in HB4-1 as external force input, carrying out finite element simulation calculation in an installation process, and obtaining a minimum pressure value P' of a sealing surface when an actual conduit is sealed; and when P'>=P, indicating that the installation sealing effect of the actual guide pipe in the state is good, and the leakage probability is low, and when P'<=P, indicating that the leakage risk exists in the installation of the actual guide pipe in the state. According to the method, the guide pipe assembly sealing performance is predicted, and the problem that a simulation result is inconsistent with an actual result due to material performance difference in a traditional simulation method is solved.

Description

technical field [0001] The invention belongs to the technical field of flared conduit assembly, and in particular relates to a method for predicting the sealing performance of flared conduit assembly. Background technique [0002] At present, as the main parts of aircraft at home and abroad, conduits are widely used in key parts such as aero-engines, fuselage hydraulics, environmental control, and fuel systems. The installation quality seriously affects aircraft performance and safety. However, there are different degrees of leakage in catheters at home and abroad. [0003] Conduit assembly error is the key cause of conduit quality problems. Excessive assembly error will lead to stress concentration of pipe joints, affecting installation quality and airtight effect. Among the many ducts of the aircraft, the flared duct is the most sensitive to assembly errors, and its leakage phenomenon is also the most serious, but it is widely used in various systems of the aircraft becau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G06F113/14G06F119/14
CPCG06F30/23G06F2119/14G06F2113/14
Inventor 陈松林叶翔宇蓝玉龙严厉陈浩
Owner CHENGDU AIRCRAFT INDUSTRY GROUP