CN110427677A - Bend pipe structure Fast design method in a kind of aero-engine external pipeline system - Google Patents
Bend pipe structure Fast design method in a kind of aero-engine external pipeline system Download PDFInfo
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- CN110427677A CN110427677A CN201910670220.8A CN201910670220A CN110427677A CN 110427677 A CN110427677 A CN 110427677A CN 201910670220 A CN201910670220 A CN 201910670220A CN 110427677 A CN110427677 A CN 110427677A
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- 238000013461 design Methods 0.000 title claims abstract description 81
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- 238000005086 pumping Methods 0.000 description 4
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L43/00—Bends; Siphons
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/033—Noise absorbers
- F16L55/035—Noise absorbers in the form of specially adapted hangers or supports
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- Supports For Pipes And Cables (AREA)
Abstract
The present invention relates to Aeronautics and Astronautics device external field of accessories, it discloses bend pipe structure Fast design methods in a kind of aero-engine external pipeline system, the light-weight design of bend pipe structure in external pipeline system is completed, bend pipe structure vibration fault is reduced, increases bend pipe structure vibration resistance.The initial design stage of present invention bend pipe structure in Aeronautics and Astronautics device external pipe-line system, bend pipe structure vibration state is estimated by bend pipe structure Fast design method, the technology variable parameter for optimizing bend pipe structure according to estimation results, completes the quick design of bend pipe structure.The present invention can reduce design cost, shorten the lead time, improve the installation arrangement success rate of bend pipe structure in external pipeline system.
Description
Technical field
The invention belongs to Aeronautics and Astronautics device external field of accessories, it is fast to be related to bend pipe structure in a kind of external pipeline system
Fast design method.
Background technique
Largely there is bend pipe knot due to installation space and installation environment limitation etc. in Aeronautics and Astronautics exterior line structure
Configuration formula, bend pipe structure include " Z " type, " L " type, " S " type etc., and bending radius disunity, clip position is not fixed, entire bend pipe
There is very big uncertainty in structure design.Bend pipe structure can cause the entire rigidity of pipe-line system while change pipeline moves towards
With the variation of Mass Distribution, therefore, when bent pipe fashion changes, the inherent characteristic of pipe-line system and vibration behavior may also be with
Variation, this is and straight tube system nature area's otherwise.
Bend pipe structure in external pipeline system designs no unified design approach and evaluation criterion, typically there is engineering
Technical staff is designed by personal experience.Tests exemplar is first usually processed using CAD modeling and finite element analysis, it is real
After the installation arrangement of border, test run test is carried out, to guarantee complete machine oscillation requirement, pipeline structure optimization is carried out according to test result.Such as
Fruit goes wrong in the initial design stage of bend pipe structure, can only could often find when equipment carries out test run, returns initial
Design phase redesigns, and needs longer modification time, seriously affects the production cycle of product.
Engineers and technicians often do not account for its boundary condition in the initial design stage of bend pipe structure.Pipeline undertakes fortune
The task of transporting fluid medium, and its working environment is sufficiently complex.In the bend pipe structure of pumping source excitation, pump outlet pressure acts on curved
When pipe structure, since axial compressive force can act directly on bend pipe corner, the exciting force of bend pipe structure is caused to be apparently higher than straight tube
The case where, thus the vibration of bend pipe structure will be typically higher than straight tube structure.There are when impact of water hammer phenomenon, especially there is rubber
Under the fixing situation of clip, incentive action power but will obviously increase.Another vibration characteristic of bend pipe structure is the intrinsic frequency of low order
Rate is relatively low, it is easier to which be excited resonance and substantially forced vibration.
Pipeline structure design is big with installation workload, and precision cannot be guaranteed, experimental test seriously disconnects with theory analysis.Such as
Where the bend pipe structure initial design stage in external pipeline system, analysis understands the boundary condition of bend pipe structure, and design is reasonable
Bend pipe structure parameter obtains optimal bend pipe structure by parameter optimization, and not needing pilot production exemplar can be realized initial
Design phase can grasp the vibration characteristics of bend pipe structure comprehensively, complete vibration and estimate, so that it is met complete machine oscillation requirement is
It is very necessary.Therefore, it is extremely urgent for studying a kind of technological invention of bend pipe structure Fast design method in external pipeline system
It cuts.
Summary of the invention
The technical problems to be solved by the present invention are: proposing that bend pipe structure is fast in a kind of aero-engine external pipeline system
Fast design method completes the light-weight design of bend pipe structure, while avoiding the vibration fault of bend pipe structure from occurring to the greatest extent,
The vibration resistance of bend pipe structure is improved, it can be achieved that the vibration of bend pipe structure is estimated, it is made to meet complete machine oscillation requirement.
The technical solution adopted by the present invention to solve the technical problems is:
Bend pipe structure Fast design method in a kind of aero-engine external pipeline system, comprising the following steps:
(1) bend pipe structure vibration index is determined
By on equipment complete machine oscillation Distribution Indexes to each attachment device, including pumping source, external pipeline system, bracket and its
His attachment etc., different structure system bear the maximum value of vibration as its vibration index.Bend pipe structure form is different, is held
The vibration maximum value received is different.In conjunction with designed bend pipe structure form, including bend pipe, connector and other connection attachmentes etc., really
The vibration index of fixed designed bend pipe structure, the evaluation criterion estimated as vibration.
Further, bend pipe bearing structure is determined according to vibration index distribution principle in the initial design stage of bend pipe structure
The vibration index of system.The evaluation criterion of the bend pipe structure vibration index refers to be distributed vibration lower than bearing structure system
0.8 times of target or higher than 1.5 times of the distributed vibration index of bearing structure system.
(2) bend pipe-clip system model is determined
It is reduced to bend pipe-clip system according to one section of bend pipe that model reduction principle supports two clips, as research
Object, bend pipe-clip boundary conditions include Boundary Conditions in Structures and two kinds of load boundary condition.Determine bend pipe-clip system
After Boundary Conditions in Structures of uniting and load boundary condition design parameter, bend pipe-clip system is reduced to outer load force exciting
Single-degree-of-freedom equivalent mass-spring system model to get arrive bend pipe-clip system model.
Further, the Boundary Conditions in Structures is determined by bend pipe-clip system structure feature.Support the support of clip
Characteristic includes rigid support and resilient support, and various forms of support clips are thought of as corresponding equivalent stiffness on direction of vibration
And equivalent damping.In conventional design, support clip clipping room can be installed additional in pipe bent position and support the clip to increase to be away from being 400mm
The rigidity of structure of uniting need to consider to optimize bend pipe structure to change whole bend pipe-clip system vibration frequency if installation environment does not allow
Rate.The bend pipe studied-clip system two sides can be ignored the ontology rigidity of pipeline, will manage if connected without other attachmentes
Road is thought of as lumped mass, and bend pipe is thought of as the model analysis that straight tube adds lumped mass.If two sides are connected with other attachmentes,
Including that can be reduced to lumped mass according to accessory structure feature or lumped mass adds bullet at attachment, valve body and pumping source etc.
Spring constraint.
Further, fluid media (medium) parameter and installation that the load boundary condition is conveyed according to bend pipe-clip system
Environment determines.The fluid media (medium) parameter includes pressure fluctuation, flow pulsation and temperature of fluid media (medium) etc.；Installation environment is general
All existence foundation vibrations and other load vibrations.In modeling process, by the impulse excitation of fluid media (medium) and installation environment
Basic excitation or the vibrational excitations of other load be reduced to the outer load force of single-degree-of-freedom mass-spring system.
(3) bend pipe-clip the system design variables are determined
Design variable include the radius of curvature of bend pipe, bending angle and support the clipping room of clip away from etc..Design variable
Determination is influenced by factors such as installation environment and vibration indexes.
Further, the clipping room of bend pipe support clip is required away from must satisfy aeroengine pipeline laying, i.e., spacing exists
Within 400mm, since aero-engine external structure is complicated, limited space, support clip clipping room is away from it is difficult to ensure that laying is wanted
Ask, need according to actual installation environment, determine support clip clipping room away from.
Further, support clip clipping room is determined away from rear, supports clip clipping room institute's connecting leg road away between in design
When moving towards, limit by the structure of installation casing, the bending radius and bending angle of bend pipe cannot any choosing value, i.e., designed by it is curved
Pipe structure cannot be arbitrarily devised, can only determine bending radius and bending angle in the case where meeting case structure mounting condition.
Further, according to installation environment and mounting condition, primarily determine the radius of curvature of bend pipe in bend pipe-clip system,
For the clipping room of bending angle and support clip away from design variables are waited, different design variables can cause bend pipe-clip system whole
The variation of a rigidity and Mass Distribution, and then influence bend pipe-clip system vibration characteristics.
(4) optimize bend pipe-clip system vibration parameter
It primarily determines design variable, bend pipe-clip system can be reduced to equivalent mass-spring system model, with system
Vibratory output is optimal to carry out the design of bend pipe-clip system oscillation parameter optimization for target.By optimizing bend pipe-clip system model
Vibration parameters so that the vibration characteristics of system meets vibration index.
Further, the pipeline among bend pipe-clip system is bent region, since clip support span increases, works as pipeline
When vibrating, influence of the intermediate region due to lumped mass, system frequency reduction, the vibration aggravation of pipeline.By bend pipe
Caused by warp architecture, equivalent mass of the system in vibration processes is greater than real quality, and causes judder, is defined as curved
The equivalent mass effect of pipe.The equivalent mass of system is significantly greater than the real quality of pipeline.
Further, the bend pipe-clip system model vibration parameters include equivalent mass mdWith equivalent stiffness kdDeng.
The equivalent mass m of systemdBy the real quality m of bend pipepWith simplified lumped mass meComposition, the size of equivalent mass are as follows:
md=mp+me
During bend pipe-clip system vibration, since single order vibration is mainly based on vertical direction bending vibration, then system
Rigidity is determined by the support stiffness of the vertical direction of clip.If the clip support stiffness of the clip at system both ends vertically point
It Wei not ky1And ky2, since clip model is identical, characteristic is identical, therefore ky1=ky2, the clip at both ends is in parallel, then has equivalent stiffness kd:
kd=ky1+ky2；
The equivalent mass m of systemdCan according to bend pipe structure vibration index, by single-degree-of-freedom mass-spring system into
Row vibration analysis obtains, and then lumped mass m can be obtainede.It is calculated by parameter optimization, available optimal lumped mass number
Value, and then can determine optimal bend pipe structure design variable, then complete the quick design of bend pipe structure.
(5) bend pipe-clip system vibration index is evaluated
If optimization after bend pipe-clip system vibration parameter, meet complete machine oscillation Distribution Indexes as a result, if illustrate it is curved
Pipe-clip system vibration qualified, then complete design.
If optimization after bend pipe-clip system vibration parameter, be unsatisfactory for complete machine oscillation Distribution Indexes as a result, if illustrate it is curved
Pipe-clip vibration index is unqualified, then reaffirms design variable back to step (3), until meeting design requirement and completing
Design.
The beneficial effects of the present invention are:
In the bend pipe structure initial design stage, pass through the curved of the boundary condition of determining bend pipe structure, design variable and simplification
The system parameters such as pipe-clip system equivalent mass, equivalent stiffness, and bend pipe-clip system vibration parameters are optimized
Design makes it meet vibration index, shortens bend pipe-clip system design and manufacture period, improves the reliability of bend pipe structure, most
The quick design of bend pipe structure is completed eventually.
Detailed description of the invention
Fig. 1 is a kind of process of bend pipe structure rapid design technology scheme in external pipeline system in embodiment of the present invention
Figure.
Fig. 2 is that bend pipe-clip mechanics of system schematic diagram and bend pipe-clip system are equivalent at straight tube in embodiment of the present invention
Add the simplification mechanics schematic diagram of lumped mass.Fig. 2 (a) is bend pipe-clip mechanics of system schematic diagram, in figure, kx1Indicate side support card
Bind round the direction x support stiffness, kx2Indicate the direction other side clip x support stiffness, ky1Indicate that the side support direction clip y support is rigid
Degree, ky2Indicate that the other side supports the direction clip y support stiffness；Fig. 2 (b), which is that bend pipe-clip system is equivalent, adds concentration matter at straight tube
The simplification mechanics schematic diagram of amount, in figure, meIndicate simplified lumped mass.
Fig. 3 is single-degree-of-freedom equivalent mass-spring of the bend pipe-clip system with outer load force in embodiment of the present invention
System model.In figure, kdThe Equivalent strut rigidity of expression system, c indicate the equivalent damping of system, mdThe equivalent matter of expression system
Amount, F0The equivalent outer load force of cos (Ω t) expression system.
Specific embodiment
The present invention is intended to provide bend pipe structure Fast design method in a kind of external pipeline system, in external pipeline system
The initial design stage of bend pipe structure, the vibration that bend pipe structure can be realized are estimated, and are completed the light-weight design of bend pipe structure, are kept away
The vibration fault for exempting from bend pipe structure occurs, and improves the vibration resistance of bend pipe structure, its vibration characteristics is made to meet complete machine oscillation requirement.
With reference to the accompanying drawing 1 and embodiment the solution of the present invention is further described:
(1) in the initial design stage of bend pipe structure, by the different attachment device architectures system of aero-engine external structure
System bears vibration index of the maximum value of vibration as structural system.First by equipment complete machine oscillation Distribution Indexes to each attached
On part device, including pumping source, external pipeline system, bracket and other attachmentes etc..In conjunction with designed bend pipe structure form, including
Bend pipe, connector and other connection attachmentes etc., determine the vibration index of designed bend pipe structure, the evaluation estimated as vibration
Standard.
The characteristics of considering support clip forms bend pipe-clip system using support clip as the bearing structure of bend pipe structure
System.Bend pipe-clip system vibration index evaluation criterion by lower than 0.8 times of distribution vibration index or be higher than and distributed vibration
1.5 times of index.
(2) after obtaining bend pipe-clip system vibration index, one section of bend pipe that two clips support is reduced to bend pipe-
Clip system further determines that the Boundary Conditions in Structures and load boundary condition of system as research object.
Boundary Conditions in Structures is determined by bend pipe-clip system structure feature.The support performance of clip includes rigid support
And resilient support, various forms of support clips are thought of as corresponding equivalent stiffness and equivalent damping on direction of vibration.It is conventional
In design, support clip clipping room away from be 400mm, pipe bent position can install additional support clip to increase system structure rigidity, such as peace
Dress environment does not allow, and need to consider to optimize bend pipe structure to change whole bend pipe-clip system vibrational frequency.
Bend pipe-clip system support clip two sides, if connected without other attachmentes, only simple pipeline, according to
Experimental test analysis it is found that support clip on the outside of pipeline do not influence bend pipe-clip system vibration characteristics, i.e., contracted according to model
Subtract one section of bend pipe that principle supports two clips and be reduced to bend pipe-clip system, as research object, therefore in the analysis process
It can simplify bend pipe-clip system structure, bend pipe-clip system mechanics schematic diagram can be established, as shown in attached drawing 2 (a).Due to card
It binds round support stiffness and is much smaller than tube body rigidity itself, therefore ignore the ontology rigidity of pipeline, pipeline is thought of as lumped mass, by bend pipe
It is thought of as the model analysis that straight tube adds lumped mass, as shown in attached drawing 2 (b).It, can be according to attached if two sides are connected with other attachmentes
Part design feature, is reduced to lumped mass or lumped mass adds spring constraint.
The fluid media (medium) parameter and installation environment that load boundary condition is conveyed according to bend pipe-clip system determine.Conveying
Fluid media (medium) parameter include pressure fluctuation, flow pulsation and temperature of fluid etc..Bend pipe-clip system installation environment is general
All existence foundation vibrations and other load vibrations.After specifying bend pipe-clip system Boundary Conditions in Structures, modeling
The basic excitation and other external applied load excitations of the impulse excitation of fluid media (medium) and installation environment are reduced to the outer of system by Cheng Zhong
System is reduced to single-degree-of-freedom equivalent mass-spring system model with outer load force exciting, as shown in Fig. 3 by load force.
(3) after the boundary condition of clear system, further the design variable of bend pipe structure is completed in design.Design variable packet
Include the radius of curvature of bend pipe, bending angle and support the clipping room of clip away from etc..The determination of design variable is by installation environment and vibration
The factors such as dynamic index influence.
Bend pipe support clip clipping room away from must satisfy aeroengine pipeline laying require, i.e., spacing 400mm with
Interior, since aero-engine external structure is complicated, limited space, support clip clipping room is away from it is difficult to ensure that laying requirement, needs
According to actual installation environment, determine support clip clipping room away from.
Support clip clipping room is determined away from rear, when the moving towards of institute's connecting leg road between two contacts of design, by fitting machine
The position of casket and the limitation of Vibration Index, design variable cannot any choosing values.Bend pipe-clip system design variable is direct
Influence the lumped mass m of system modele, and then influence bend pipe-clip system vibration characteristics.
(4) it after determining design variable, is opened so that the vibration characteristics of simplified equivalent mass-spring system is optimal for target
Open up the design of bend pipe-clip system oscillation parameter optimization.By optimizing bend pipe-clip system model vibration parameters, so that being
The vibration characteristics of system meets vibration index evaluation criterion.
Pipeline among bend pipe-clip system is bent region, since clip support span increases, when pipeline vibrates
When, influence of the intermediate region due to lumped mass, system frequency reduction, the vibration aggravation of pipeline.Bend pipe-clip system mould
The vibration parameters of type include equivalent mass and equivalent stiffness etc..The equivalent mass m of systemdBy the real quality m of bend pipepAnd simplification
Lumped mass meComposition, the size of equivalent mass are as follows:
md=mp+me
By experimental test it is found that the vibration frequency of aero-engine is mostly in 300Hz hereinafter, pipeline-clip system one
Rank dominant frequency is vibrated mostly between 100-200Hz, therefore during bend pipe-clip system vibration, mainly to analyze vertical direction
Based on first-order bending vibration, then system stiffness is determined by the support stiffness of the vertical direction of clip.If the clip edge at system both ends
The clip support stiffness of vertical direction is respectively kx1And kx2, since clip model is identical, characteristic is identical, then have:
kx1=kx2。
For example, analyzing diameter 12mm simply connected bend pipe-clip system, support clip uses elastic rubber clip, branch
Supportting rigidity is 1.131 × 105N/m, bend pipe shape are " Z " type, outer diameter 12mm, internal diameter 10mm, Pipes Density 7800kg/m3, bend pipe
Length 0.81m, is motivated using electromagnetic vibration generator system.It is by that can determine to bend pipe-clip system progress frequency sweep and fixed frequency test
Unite first natural frequency fn=69.12Hz, vibratory response amplitude a=34.19g, by system frequency formula, available system
System equivalent mass be
It is computed, the real quality m of pipelinep=0.218kg, and the equivalent mass m of systemd=0.623kg, system etc.
Effect quality is significantly greater than the real quality of pipeline, so, it is believed that the equivalent mass of system is exactly the real quality m of pipelinep
With simplified lumped mass meComposition, i.e., lumped mass value is me=0.405kg.
It follows that the pipeline among bend system is bent region, since clip support span increases, when pipeline occurs
When vibration, influence of the intermediate region due to lumped mass, system frequency reduction, the vibration aggravation of pipeline.It is this by pipeline
Caused by warp architecture, equivalent mass of the system in vibration processes is greater than real quality, and the phenomenon that cause judder, fixed
Justice is the equivalent mass effect of bend pipe.
The equivalent mass m of systemdCan according to bend pipe structure vibration index, by single-degree-of-freedom mass-spring system into
Row vibration analysis obtains, and then lumped mass m can be obtainede.It is calculated by parameter optimization, available optimal lumped mass number
Value, and then can determine optimal bend pipe structure design variable, then complete the quick design of bend pipe structure.
(5) setting should be met by simplifying the equivalent mass-spring system model vibration characteristics generated by bend pipe-clip system
Vibration index evaluation criterion.If bend pipe-clip system vibration parameter after optimization, meets complete machine oscillation Distribution Indexes knot
Fruit then illustrates bend pipe-clip system vibration qualified, then complete design.If bend pipe-clip system vibration ginseng after optimization
Number, is unsatisfactory for complete machine oscillation Distribution Indexes as a result, then illustrating that bend pipe-clip vibration index is unqualified, then needs to reaffirm design
Variable, until meeting design requirement and complete design.
Embodiment described above only expresses embodiments of the present invention, and but it cannot be understood as to the invention patent
Range limitation, it is noted that for those skilled in the art, without departing from the inventive concept of the premise, also
Several modifications and improvements can be made, these are all belonged to the scope of protection of the present invention.
Claims (1)
1. bend pipe structure Fast design method in a kind of aero-engine external pipeline system, which is characterized in that including following step
It is rapid:
(1) bend pipe structure vibration index is determined
By on equipment complete machine oscillation Distribution Indexes to each attachment device, different structure system bears the maximum value conduct of vibration
Its vibration index；It is distributed in conjunction with designed bend pipe structure form according to vibration index in the initial design stage of bend pipe structure
Principle determines the vibration index of designed bend pipe structure, the evaluation criterion estimated as vibration；
The evaluation criterion of the vibration index of the bend pipe structure is 0.8 times lower than the distributed vibration index of bearing structure system
Or 1.5 times higher than the distributed vibration index of bearing structure system；
(2) bend pipe-clip system model is determined
It is reduced to bend pipe-clip system according to one section of bend pipe that model reduction principle supports two clips, as research object,
Bend pipe-clip boundary conditions include Boundary Conditions in Structures and two kinds of load boundary condition；Determine bend pipe-clip architecture side
After boundary's condition and load boundary design parameter, it is equivalent that bend pipe-clip system is reduced to the single-degree-of-freedom with outer load force exciting
Mass-spring system model determines bend pipe-clip system model；
The Boundary Conditions in Structures is determined by bend pipe-clip system structure feature；It includes rigid for supporting the support performance of clip
Property support and resilient support, various forms of support clips are thought of as corresponding equivalent stiffness and equivalent resistance on direction of vibration
Buddhist nun；The bend pipe studied-clip system two sides can be ignored the ontology rigidity of pipeline, will manage if connected without other attachmentes
Road is thought of as lumped mass, and bend pipe is thought of as the model analysis that straight tube adds lumped mass；If two sides are connected with other attachmentes,
It can be reduced to lumped mass according to accessory structure feature or lumped mass adds spring constraint；
The fluid media (medium) parameter and installation environment that the load boundary condition is conveyed according to bend pipe-clip system determine；In
In modeling process, the vibrational excitation of the basic excitation or other load of the impulse excitation of fluid media (medium) and installation environment is reduced to
The outer load force of single-degree-of-freedom mass-spring system；The fluid media (medium) parameter includes the pressure fluctuation of fluid media (medium), flow arteries and veins
Dynamic and temperature；The installation existence foundation vibration and other load vibrations；
(3) bend pipe-clip the system design variables are determined
The design variable includes the radius of curvature of bend pipe, bending angle and supports the clipping room of clip away from design variable is really
It is fixed to be influenced by installation environment and vibration index factor；The clipping room of the described bend pipe support clip is away from meeting aeroengine pipeline
Laying requires, according to actual installation environment, determine support clip clipping room away from；Support clip clipping room is determined away from rear, is being set
Meter support clip clipping room when moving towards of institute's connecting leg road away between, in the case where meeting case structure mounting condition, determines bending radius
And bending angle；
(4) optimize bend pipe-clip system vibration parameter
It primarily determines design variable, bend pipe-clip system is reduced to equivalent mass-spring system model, with system vibration amount
It is optimal to carry out the design of bend pipe-clip system oscillation parameter optimization for target；By optimizing the vibration of bend pipe-clip system model
Parameter, so that the vibration characteristics of system meets vibration index；
The bend pipe-clip system model vibration parameters include equivalent mass mdWith equivalent stiffness kd；
The equivalent mass mdBy the real quality m of bend pipepWith simplified lumped mass meComposition, the size of equivalent mass are as follows:
md=mp+me
During bend pipe-clip system vibration, single order vibration is mainly based on vertical direction bending vibration, then system stiffness is by card
The support stiffness of the vertical direction of hoop determines；If the clip support stiffness of the clip at system both ends vertically is respectively ky1With
ky2, since clip model is identical, characteristic is identical, therefore ky1=ky2, the clip at both ends is in parallel, then has equivalent stiffness kd:
kd=ky1+ky2；
The equivalent mass m of systemdIt can be according to bend pipe structure vibration index, by being vibrated to single-degree-of-freedom mass-spring system
Analysis obtains, and then lumped mass m can be obtainede；It is calculated by parameter optimization, available optimal lumped mass meNumerical value, into
And can determine optimal bend pipe structure design variable, the quick design of bend pipe structure is then completed, i.e. completion pipeline curvature half
The clipping room of diameter, bending angle and support clip optimizes away from design variable；
(5) bend pipe-clip system vibration index is evaluated
If optimization after bend pipe-clip system vibration parameter, meet complete machine oscillation Distribution Indexes as a result, if illustrate bend pipe-card
System vibration qualified is bound round, then complete design；
If optimization after bend pipe-clip system vibration parameter, be unsatisfactory for complete machine oscillation Distribution Indexes as a result, if illustrate bend pipe-
Clip vibration index is unqualified, then reaffirms design variable back to step (3), until meeting design requirement and completing to set
Meter.
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| CN201910670220.8A CN110427677B (en) | 2019-07-24 | 2019-07-24 | Rapid design method for elbow structure in external pipeline system of aircraft engine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113148231A (en) * | 2021-05-14 | 2021-07-23 | 北京宇航系统工程研究所 | Catheter dynamic strength modular structure based on staggered frequency design |
| CN114112176A (en) * | 2021-11-10 | 2022-03-01 | 中国航发沈阳发动机研究所 | External pipeline design method for connecting surge differential pressure or pressure sensor |
| CN114841038A (en) * | 2022-05-10 | 2022-08-02 | 西安交通大学 | Intelligent design method for nuclear power station primary loop pipeline support arrangement under complex load |
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| CN113148231A (en) * | 2021-05-14 | 2021-07-23 | 北京宇航系统工程研究所 | Catheter dynamic strength modular structure based on staggered frequency design |
| CN114112176A (en) * | 2021-11-10 | 2022-03-01 | 中国航发沈阳发动机研究所 | External pipeline design method for connecting surge differential pressure or pressure sensor |
| CN114112176B (en) * | 2021-11-10 | 2023-09-22 | 中国航发沈阳发动机研究所 | Design method of external pipeline connected with surge pressure difference or pressure sensor |
| CN114841038A (en) * | 2022-05-10 | 2022-08-02 | 西安交通大学 | Intelligent design method for nuclear power station primary loop pipeline support arrangement under complex load |
| CN114841038B (en) * | 2022-05-10 | 2024-04-12 | 西安交通大学 | Intelligent design method for primary loop pipeline bracket arrangement of nuclear power station under complex load |
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