CN110489825A - A kind of Compensation Design method of big orifice class air pipe line - Google Patents
A kind of Compensation Design method of big orifice class air pipe line Download PDFInfo
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- CN110489825A CN110489825A CN201910695186.XA CN201910695186A CN110489825A CN 110489825 A CN110489825 A CN 110489825A CN 201910695186 A CN201910695186 A CN 201910695186A CN 110489825 A CN110489825 A CN 110489825A
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- air pipe
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Abstract
The application belongs to engine pipelines design field, is related to a kind of Compensation Design method of big orifice class air pipe line.The method includes the steps S1, the finite element model for the big orifice air pipe line for obtaining design to be compensated；Step S2, displacement boundary conditions and temperature field load are applied to the finite element model, calculates the static strength of pipeline itself；If step S3, the static strength of pipeline itself is unsatisfactory for margin of safety requirement, multiple compensation of pipeline devices are arranged on pipeline；Step S4, the static strength of pipeline itself is calculated according to the constraint condition of step S2 again, if the static strength of pipeline itself meets margin of safety requirement, each compensation of pipeline device is then successively removed, until pipeline itself static strength after any one compensation of pipeline device of removal is all unsatisfactory for requirement.This application involves Compensation Design method Compensation Design ability and flexibility all greatly improved compared with conventional compensation design method.
Description
Technical field
The application belongs to engine pipelines design field, in particular to a kind of compensation of big orifice class air pipe line is set
Meter method.
Background technique
Aero-engine core nacelle big orifice class air pipe line space moves towards complicated, and manufacture rigging error is big, use environment
Temperature is high, and that there are thermal deformations is uncoordinated with casing, itself rigidity is strong, and compensation ability is poor, and by bleed air pressure, bending in working
The influence of the factors such as load, engine luggine, operating condition is very severe, these factors can all cause biggish answer in pipeline
Power and thermal deformation, Yi Yinfa pipeline fracture etc. failures, simultaneously because aircraft side to winged hair interface air pipe line also proposed compared with
High Compensation Design demand.In aero-engine, traditional core nacelle air pipe line mainly pass through improve pipeline natural resiliency or
Person compensates design using metal bellows.Pipeline elastic compensating design method, which passes through, increases catheter length, bending width
Degree reduces the means such as radius bend to improve pipeline elasticity and compensation ability.Metal bellows Compensation Design method i.e. by
Increase metal bellows in associated pipe, design is compensated using the compensation characteristic of metal bellows.
Aero-engine core nacelle air pipe line Compensation Design method is mainly mended using metal bellows, pipeline elasticity at present
It repays design method and compensates design, this two kinds of Compensation Design method disadvantages are as follows:
Metal bellows Compensation Design method: wavy metal pipe volume is larger, heavier-weight；Without torsion safeguard measure, lead
Cause reliability is not high, service life is limited；Bellows unprotect limits device, easy damaged frequently need to be checked and be replaced, cause into
This increase, efficiency reduce.
Pipeline elastic compensating design method: because being limited by engine gabarit, weight, cause its compensation ability limited, not
It is able to satisfy the Compensation Design requirement of aero-engine core nacelle big orifice (latus rectum Φ 40mm or more) class air pipe line.
Summary of the invention
To solve the above problems, this application provides a kind of Compensation Design methods of big orifice class air pipe line to include:
Step S1, the finite element model of the big orifice air pipe line of design to be compensated is obtained；
Step S2, displacement boundary conditions and temperature field load are applied to the finite element model, calculates pipeline itself
Static strength；
If step S3, the static strength of pipeline itself is unsatisfactory for margin of safety requirement, arrange that multiple pipelines are mended on pipeline
Repay device；
Step S4, the static strength of pipeline itself is calculated according to the constraint condition of step S2 again, if pipeline itself is quiet strong
Degree meets margin of safety requirement, then successively removes each compensation of pipeline device, until the pipeline after any one compensation of pipeline device of removal
Until itself static strength is all unsatisfactory for requirement；And
Step S5, big orifice class air pipe line is carried out according to the step S4 compensation of pipeline device quantity calculated and installation site
Compensation.
Preferably, the step S1 further comprises:
Obtain the big orifice air pipe line 3-D geometric model of design to be compensated；
The formatted file that finite element analysis software can call is converted to using UGNX software；
The above-mentioned formatted file that can be identified is generated into finite element model using finite element analysis software.
Preferably, applying displacement boundary conditions to finite element model in step S2 includes:
Under different operating conditions, apply displacement and diameter axially backward along engine with casing connecting tube connector working face node
To being displaced outwardly.
Preferably, the different operating conditions include ground idle speed state, high temperature takeoff condition, tube body pressured state and pipe
Body tension state.
Preferably, in step S2, the static strength for calculating pipeline itself includes:
The yield factor of safety and the ultimate factor of safety under different operating conditions.
Preferably, in step S3, the margin of safety is required to include:
Under each operating condition, the yield factor of safety is not less than 1.2 and the ultimate factor of safety is not less than 1.5.
Preferably, in step S3, the compensation of pipeline device is arranged in the pipe bent position of the big orifice class air pipe line.
It preferably, further comprise compensation of pipeline device of the de-stress lower than setting value before the step S4.
This application involves Compensation Design method Compensation Design ability and flexibility all have compared with conventional compensation design method
It greatly improves, is not easily susceptible to the influence of engine gabarit, weight, compensation conduit space layout situation, can satisfy aeroplane engine
Machine big orifice class air pipe line Compensation Design demand.
Detailed description of the invention
Fig. 1 is the flow chart of a preferred embodiment of the Compensation Design method of the application big orifice class air pipe line.
Fig. 2 is the 3-D geometric model schematic diagram of design pipeline to be compensated.
Specific embodiment
To keep the purposes, technical schemes and advantages of the application implementation clearer, below in conjunction with the application embodiment
In attached drawing, the technical solution in the application embodiment is further described in more detail.In the accompanying drawings, identical from beginning to end
Or similar label indicates same or similar element or element with the same or similar functions.Described embodiment is
A part of embodiment of the application, rather than whole embodiments.Embodiment below with reference to attached drawing description is to show
Example property, it is intended to for explaining the application, and should not be understood as the limitation to the application.Based on the embodiment in the application,
Every other embodiment obtained by those of ordinary skill in the art without making creative efforts belongs to this
Apply for the range of protection.Presently filed embodiment is described in detail with reference to the accompanying drawing.
To solve, metal bellows Compensation Design method reliability is not high, service life is limited and the design of pipeline elastic compensating
Method is easy the Compensation Design demand that the gabarit harsh by engine, weight and aircraft side propose and is limited, and compensation ability is limited
The shortcomings that, present applicant proposes apply compensation of pipeline device to compensate in aero-engine core nacelle big orifice class air pipe line
The method of design, the design cycle and method proposed according to the application can realize aero-engine core nacelle big orifice class air hose
The Compensation Design on road improves the reliability and service life of pipeline to reduce the stress of pipeline during the work time.The application energy
It enough solves the problems, such as to specifically include that
The Compensation Design method that the application proposes being capable of the class air pipe line thermal deformation of effective compensation big orifice and hot end casing
Cumulative limit, the stress of aero-engine core nacelle big orifice class air pipe line is greatly reduced, improve pipeline reliability, dress
With property and service life.The application is relative to metal bellows Compensation Design method, in terms of weight, reliability, service life
It is all significantly improved, relative to pipeline elastic compensating design method, is then not readily susceptible to by engine gabarit, the limit of weight
System can better meet the larger Compensation Design demand that aircraft side proposes the big orifice air pipe line of winged hair interface.
This application provides a kind of Compensation Design methods of big orifice class air pipe line, comprising:
Step S1, the finite element model of the big orifice air pipe line of design to be compensated is obtained；
Step S2, displacement boundary conditions and temperature field load are applied to the finite element model, calculates pipeline itself
Static strength；
If step S3, the static strength of pipeline itself is unsatisfactory for margin of safety requirement, arrange that multiple pipelines are mended on pipeline
Repay device；
Step S4, the static strength of pipeline itself is calculated according to the constraint condition of step S2 again, if pipeline itself is quiet strong
Degree meets margin of safety requirement, then successively removes each compensation of pipeline device, until the pipeline after any one compensation of pipeline device of removal
Until itself static strength is all unsatisfactory for requirement；And
Step S5, big orifice class air pipe line is carried out according to the step S4 compensation of pipeline device quantity calculated and installation site
Compensation.
In some optional embodiments, as shown in Figure 1, the method specifically includes that
1, using UG NX business software under modeling module, the big orifice air pipe line three of a design to be compensated is imported
Geometrical model is tieed up, saves as * .prt formatted file, as shown in Figure 2.
2, pipeline 3-D geometric model is carried out using UG NX software calculating preceding model treatment.
3, * .x_t formatted file is generated using the format conversion function of UG NX software.
4, * .x_t file is called using finite element analysis software ANSYS, generates * .db formatted file.
5, * .db formatted file is read by finite element analysis software ANSYS, and displacement boundary is applied to finite element model
Condition and temperature field load, calculate the static strength of pipeline itself, judge whether to meet margin of safety requirement.
In the step, * .db formatted file is read by finite element analysis software ANSYS first, carries out pre-treatment (material
1) mechanical performance data of GH536 at various temperatures is shown in Table.
1 GH536 material mechanical performance data of table
Later, displacement boundary conditions and temperature field load are applied using boundary condition listed by table 2.
2 boundary condition of table
Finally, the stress situation of design pipeline to be compensated is calculated, it is shown in Table 3.
3 pipeline stress calculating results of table
If 6, pipeline static strength meets Compensation Design requirement, terminate Compensation Design process.If pipeline static strength is not
Meet Compensation Design requirement, then the design near bend pipe is preferentially arranged according to pipeline stress distribution situation and compensation of pipeline device and thought
Think, X compensation of pipeline device is arranged on pipeline.Retain the deployment scenarios after compensation, including displacement constraint and compensation of pipeline
Device position.
As shown in Table 3, the yield factor of safety, the ultimate factor of safety of design pipeline to be compensated are not satisfied pipeline intensity and set
Count criterionPipeline need to compensate design.
According to design pipeline stress distribution situation, design feature and space layout to be compensated, 5 pipes are arranged on pipeline
Road compensator, such as five compensators of A-E in Fig. 2, it should be noted that addition pipeline compensator is executed on finite element model
The step of, finite element model and threedimensional model shown in Fig. 2 are structurally without larger difference, therefore in the example, by five
A compensator is placed in threedimensional model to be illustrated.
7, analytical calculation is carried out to the pipeline for arranging compensation of pipeline device, if wherein there is the especially small compensation of pipeline of stress
Device because its lesser compensation function can be continued to realize by remaining compensation of pipeline device, therefore can be removed directly.
Such as calculating analysis is carried out to compensation conduit by the 2nd~6 article of content, discovery compensation of pipeline device B stress is especially small, low
In setting value, therefore compensation of pipeline device 2 is removed, retains compensation of pipeline device A, C, D, E.
8, successively remove in remaining Y compensation of pipeline device it is 1 therein, 2 ... Z compensation of pipeline device, there are M
The possible situation of kind, calculates each case, if can meet pipeline after calculating analysis answers force request, then it is assumed that the compensation of pipeline
Device can remove, and so on, if arriving certain situation, the compensation of pipeline device of which position no matter is removed, stress is all discontented
Sufficient Compensation Design requirement, then complete Compensation Design.
Such as in the embodiment, compensation of pipeline device A, compensation of pipeline device C, compensation of pipeline device D, compensation of pipeline device are successively removed
E carries out calculating analysis to compensation conduit by the 2nd~6 article of content, and after discovery removes compensation of pipeline device E, pipeline stress is still able to satisfy
Compensation Design requirement, therefore compensation of pipeline device 5 is removed, retain compensation of pipeline device A, C, D.
Compensation of pipeline device A, compensation of pipeline device C, compensation of pipeline device D are successively removed, by the 2nd~6 article of content to compensation conduit
Calculating analysis is carried out, which compensation of pipeline device no matter discovery remove, and stress is all unsatisfactory for Compensation Design requirement, therefore retains pipeline
Compensator A, C, D, obtained calculated result are shown in Table 4, it is seen that pipeline surrender safety, the ultimate factor of safety meet Intensity Design standard
Then, meet Compensation Design requirement, so far complete Compensation Design.
4 pipeline stress calculating results of table
9, Compensation Design pipeline carries out pipeline test run certification test, mainly includes dynamic stress certification test, air-tightness examination
Test.If pipeline certification test does not pass through, step 6 is returned, continues Compensation Design, until pipeline certification test passes through
Until.
The above, the only specific embodiment of the application, but the protection scope of the application is not limited thereto, it is any
Within the technical scope of the present application, any changes or substitutions that can be easily thought of by those familiar with the art, all answers
Cover within the scope of protection of this application.Therefore, the protection scope of the application should be with the scope of protection of the claims
It is quasi-.
Claims (8)
1. a kind of Compensation Design method of big orifice class air pipe line characterized by comprising
Step S1, the finite element model of the big orifice air pipe line of design to be compensated is obtained；
Step S2, displacement boundary conditions and temperature field load are applied to the finite element model, calculates the quiet strong of pipeline itself
Degree；
If step S3, the static strength of pipeline itself is unsatisfactory for margin of safety requirement, multiple compensation of pipeline devices are arranged on pipeline；
Step S4, the static strength of pipeline itself is calculated according to the constraint condition of step S2 again, if the static strength of pipeline itself is full
Sufficient margin of safety requirement, then successively remove each compensation of pipeline device, until the pipeline itself after any one compensation of pipeline device of removal
Until static strength is all unsatisfactory for requirement；And
Step S5, big orifice class air pipe line is mended according to the step S4 compensation of pipeline device quantity calculated and installation site
It repays.
2. the Compensation Design method of big orifice class air pipe line as described in claim 1, which is characterized in that the step S1 into
One step includes:
Obtain the big orifice air pipe line 3-D geometric model of design to be compensated；
The formatted file that finite element analysis software can call is converted to using UGNX software；
The above-mentioned formatted file that can be identified is generated into finite element model using finite element analysis software.
3. the Compensation Design method of big orifice class air pipe line as described in claim 1, which is characterized in that having in step S2
Limit meta-model applies displacement boundary conditions
Under different operating conditions, with casing connecting tube connector working face node along engine apply displacement axially backward and it is radial to
Outer displacement.
4. the Compensation Design method of big orifice class air pipe line as claimed in claim 3, which is characterized in that the difference operating condition
Including ground idle speed state, high temperature takeoff condition, tube body pressured state and tube body tension state.
5. the Compensation Design method of big orifice class air pipe line as described in claim 1, which is characterized in that in step S2, meter
Calculate pipeline itself static strength include:
The yield factor of safety and the ultimate factor of safety under different operating conditions.
6. the Compensation Design method of big orifice class air pipe line as claimed in claim 5, which is characterized in that in step S3, institute
Margin of safety is stated to require to include:
Under each operating condition, the yield factor of safety is not less than 1.2 and the ultimate factor of safety is not less than 1.5.
7. the Compensation Design method of big orifice class air pipe line as described in claim 1, which is characterized in that in step S3, institute
State the pipe bent position that compensation of pipeline device is arranged in the big orifice class air pipe line.
8. the Compensation Design method of big orifice class air pipe line as described in claim 1, which is characterized in that the step S4 it
It takes a step forward including the compensation of pipeline device for going de-stress to be lower than setting value.
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| CN201910695186.XA CN110489825A (en) | 2019-07-30 | 2019-07-30 | A kind of Compensation Design method of big orifice class air pipe line |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111897287A (en) * | 2020-06-17 | 2020-11-06 | 成都飞机工业（集团）有限责任公司 | Conduit installation error modeling and compensating method based on digital quantity |
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