CN113148231A - Catheter dynamic strength modular structure based on staggered frequency design - Google Patents
Catheter dynamic strength modular structure based on staggered frequency design Download PDFInfo
- Publication number
- CN113148231A CN113148231A CN202110530012.5A CN202110530012A CN113148231A CN 113148231 A CN113148231 A CN 113148231A CN 202110530012 A CN202110530012 A CN 202110530012A CN 113148231 A CN113148231 A CN 113148231A
- Authority
- CN
- China
- Prior art keywords
- conduit
- dynamic strength
- catheter
- modular structure
- cross
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000013461 design Methods 0.000 title claims abstract description 21
- 230000005284 excitation Effects 0.000 claims abstract description 13
- 238000009434 installation Methods 0.000 claims abstract description 5
- 238000005452 bending Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 230000004044 response Effects 0.000 description 4
- 230000003595 spectral effect Effects 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000003938 response to stress Effects 0.000 description 3
- 239000000945 filler Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005316 response function Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 235000015842 Hesperis Nutrition 0.000 description 1
- 235000012633 Iberis amara Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
- B64G1/00—Cosmonautic vehicles
- B64G1/22—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
- B64G1/00—Cosmonautic vehicles
- B64G1/22—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
- B64G1/40—Arrangements or adaptations of propulsion systems
Abstract
A conduit dynamic strength modular structure based on a frequency-staggered design relates to a conduit dynamic strength modular structure of a frequency-staggered design used in severe mechanical environments such as a carrier rocket engine cabin. The invention comprises a catheter and a fixed structure; the starting point of the conduit is connected with the mounting base, and the end point is connected with any position; the guide pipe is bent after being led out from the starting point; the mounting base is a vibration excitation input source; the fixing structure is used for installing and fixing the guide pipe on the installation base.
Description
Technical Field
The invention relates to a conduit dynamic strength modular structure based on a frequency-staggered design, and relates to a frequency-staggered design conduit dynamic strength modular structure used in severe mechanical environments such as a carrier rocket engine cabin.
Background
The guide pipes are used in a large amount in a new generation of carrier rockets, are distributed in each cabin section, are mainly used for conveying gas media and have the functions of inflation, pressure measurement and the like. During the flight and landing of the carrier rocket, all products including the guide pipe are in a severe and complicated mechanical environment, and the possibility of failure is high. According to statistics, in the hot test and flight tasks of the engine, the phenomena of cracking, breaking and the like of pipelines and pipe supports caused by vibration account for more than 30% of the total failure rate of the engine.
Disclosure of Invention
The technical problem solved by the invention is as follows: overcome prior art's not enough, provide a pipe dynamic strength modular structure based on design frequently by mistake, through the trend and the fixed mode of rationally arranging the pipe, can effectively reduce the vibration response of pipe, avoid the pipeline to respond too big and take place to destroy.
The technical solution of the invention is as follows: a catheter dynamic strength modular structure based on a staggered frequency design comprises a catheter and a fixed structure;
the starting point of the conduit is connected with the mounting base, and the end point is connected with any position; the guide pipe is bent after being led out from the starting point; the mounting base is a vibration excitation input source;
the fixing structure is used for installing and fixing the guide pipe on the installation base.
Further, the bending radius of the conduit is not less than R20.
Further, the inner diameter of the conduit is typically no greater than 10 mm.
Further, the wall thickness of the conduit is not more than 2 mm.
Further, the length between one end of the conduit and the fixed point of the conduit is determined according to the excitation condition, so that the natural frequency of the conduit and the fixed structure is staggered from the excited high-energy section.
Further, the fixed knot constructs including clamp and support, passes through the bolt through to be fixed on the mounting base.
Furthermore, the contact surfaces of the clamp and the bracket of the fixing structure with the catheter are inwards concave to be slightly larger than the semi-cylindrical surface of the catheter.
Further, the contact width of the fixing structure and the guide pipe is 10-20 mm along the axial direction of the guide pipe.
Further, when the catheter is fixed, the flexible medium is wound on the outer side of the catheter.
Compared with the prior art, the invention has the advantages that: aiming at the problem that the guide pipe is subjected to fatigue failure in severe mechanical environments such as a carrier rocket engine cabin and the like, a dynamic strength modular structure is provided, the stress condition of the root of the guide pipe is improved through a specific pipeline layout and installation scheme, the natural frequency of the guide pipe is staggered with a high-energy section under an excitation input condition, the stress response of the guide pipe is reduced, and therefore the guide pipe is prevented from being subjected to fatigue failure. The layout method is simple and easy to implement, and has the advantages of strong universality and high reliability. The method specifically comprises the following steps:
(1) the fixing structure of the catheter is homologous with the excitation input, so that the stress response of dangerous parts such as the root of the catheter is reduced, and the possibility of fatigue failure is further reduced;
(2) the invention restrains the resonance of the catheter by the design of frequency staggering, integrally reduces the stress response of the catheter and improves the fatigue strength of the catheter.
Drawings
FIG. 1 is a graph of the pipeline frequency response function of the present invention;
fig. 2 is a schematic view of the dynamic strength modular structure of the conduit of the present invention.
Detailed Description
In order to better understand the technical solutions, the technical solutions of the present application are described in detail below with reference to the drawings and specific embodiments, and it should be understood that the specific features in the embodiments and examples of the present application are detailed descriptions of the technical solutions of the present application, and are not limitations of the technical solutions of the present application, and the technical features in the embodiments and examples of the present application may be combined with each other without conflict.
The following describes in further detail a catheter dynamic strength modular structure based on an offset frequency design provided by embodiments of the present application with reference to the drawings of the specification.
In the solution provided in the embodiment of the present application, as can be seen from fig. 2, a conduit dynamic strength modular structure based on the cross-frequency design mainly comprises a conduit 1, a fixed structure 2 and a mounting base 3. The starting point of the conduit 1 is connected with the mounting base 3, and the end point is connected with any position; the catheter 1 is bent after being led out from the starting point; the mounting base 3 is a vibration excitation input source; the fixing structure 2 is used for installing and fixing the guide pipe 1 on the installation base 3.
Further, in a possible implementation manner, the guide pipe 1 is formed by welding the filler neck and the thin-wall pipe body, and the seamless steel pipe is bent according to a design curve and then welded with the filler neck.
Optionally, in a possible realisation, the bending radius of the duct 1 is not less than R20.
Further, in one possible implementation, the inner diameter of the catheter 1 is typically no greater than 10 mm.
Optionally, in a possible realisation, the wall thickness of the duct 1 is not greater than 2 mm.
Further, in a possible implementation, the length between the end of the catheter 1 and the fixed point of the catheter 1 is determined according to the excitation conditions, so that the natural frequencies of the catheter 1 and the fixed structure 2 are offset from the high-energy section of the excitation.
Alternatively, in a possible implementation, the fixing structure 2 is generally composed of a clip and a bracket, and is fixed on the mounting base 3 by a bolt penetrating through the bracket.
Further, in a possible way of realization, the contact surfaces of the clamp and the bracket of the fixed structure 2 with the catheter 1 are recessed slightly larger than the semi-cylindrical surface of the catheter 1.
Optionally, in a possible implementation manner, the contact width of the fixing structure 2 and the guide pipe 1 is 10-20 mm along the axial distance of the guide pipe 1.
Further, in a possible realisation, the catheter 1 is fixed, the outside of the catheter 1 being wrapped with a flexible medium.
Further, the mounting base 3 is a vibration excitation input source.
In one possible embodiment, the line 1 is guided out of the excitation input, bent appropriately, and then mounted again on the mounting base 3 via the fastening structure 2, and then guided to the line end.
In one possible implementation, the first fixed point outside the origin of the catheter 1 and the origin have a vibration excitation input that is homologous.
Alternatively, in a possible implementation, the dynamic strength modular structure of the conduit 1, as shown in fig. 1, is composed of a conduit 1, a fixed structure 2, a mounting base 3 and the like. The pipe 1 drawn out from the mounting base 3 is bent as appropriate, fixed again to the mounting base 3, and then laid out toward the end of the pipeline.
The failure mode of the conduit 1 is mainly fatigue failure, and the structural random vibration fatigue means that the frequency distribution of dynamic load borne by the structure has intersection or is close to the natural frequency distribution of the structure, so that the structure generates a fatigue failure phenomenon caused by resonance, and therefore the input near the natural frequency mainly influences the response of the structural part.
Theoretical calculation analysis is as follows:
in one possible implementation, the pipeline frequency response function curve is shown in FIG. 1 over a range of linear vibrations.
Wherein: phiσ(f) Responsive to stress spectral density, phi, of the pipelinea(f) For input of acceleration spectral density, f0iIs the ith natural frequency of the structure, ξiDamping ratio of i order of structure, KiIs a coefficient determined by the structure size, vibration mode and elastic constant, all of which are equal to the input acceleration spectral density phia(f) Is irrelevant.
As can be seen from the formula in fig. 1, the peak of the power spectrum of each order of natural frequency is inversely proportional to the fourth power of the natural frequency and proportional to the first power of the input acceleration power spectral density at the natural frequency, and if the input is a flat spectrum, each peak rapidly decays as the order of the natural frequency increases, and the higher the first order natural frequency of the pipeline is, the lower the response is. Therefore, when the dynamic strength of the conduit is designed, the first-order natural frequency of the conduit is required to be improved as much as possible, so that the response of the conduit is reduced, and the fatigue damage is avoided.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (9)
1. The utility model provides a pipe dynamic strength modular structure based on design is frequently staggered which characterized in that: comprises a catheter (1) and a fixed structure (2);
the starting point of the conduit (1) is connected with the mounting base (3), and the end point is connected with any position; the guide pipe (1) is bent after being led out from the starting point; the mounting base (3) is a vibration excitation input source;
the fixing structure (2) is used for installing and fixing the guide pipe (1) on the installation base (3).
2. The modular structure of claim 1 for the dynamic strength of a conduit based on a cross-frequency design, wherein: the bending radius of the conduit (1) is not less than R20.
3. The modular structure of claim 1 for the dynamic strength of a conduit based on a cross-frequency design, wherein: the inner diameter of the catheter (1) is generally not greater than 10 mm.
4. The modular structure of claim 1 for the dynamic strength of a conduit based on a cross-frequency design, wherein: the wall thickness of the conduit (1) is not more than 2 mm.
5. The modular structure of claim 1 for the dynamic strength of a conduit based on a cross-frequency design, wherein: the length between one end of the conduit (1) and a fixed point of the conduit (1) is determined according to the excitation condition, so that the natural frequency of the conduit (1) and the fixed structure (2) is staggered from the excited high-energy section.
6. The modular structure of claim 1 for the dynamic strength of a conduit based on a cross-frequency design, wherein: the fixing structure (2) comprises a hoop and a support and is fixed on the mounting base (3) through a bolt in a penetrating mode.
7. The modular structure of claim 6 for the dynamic strength of the conduit based on the cross-frequency design, wherein: the contact surface of the clamp and the bracket of the fixed structure (2) with the catheter (1) is concave slightly larger than the semi-cylindrical surface of the catheter (1).
8. The modular structure of claim 1 for the dynamic strength of a conduit based on a cross-frequency design, wherein: the contact width of the fixed structure (2) and the guide pipe (1) is 10-20 mm along the axial distance of the guide pipe (1).
9. The modular structure of claim 1 for the dynamic strength of a conduit based on a cross-frequency design, wherein: when the catheter (1) is fixed, the flexible medium is wound on the outer side of the catheter (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110530012.5A CN113148231A (en) | 2021-05-14 | 2021-05-14 | Catheter dynamic strength modular structure based on staggered frequency design |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110530012.5A CN113148231A (en) | 2021-05-14 | 2021-05-14 | Catheter dynamic strength modular structure based on staggered frequency design |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113148231A true CN113148231A (en) | 2021-07-23 |
Family
ID=76876084
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110530012.5A Pending CN113148231A (en) | 2021-05-14 | 2021-05-14 | Catheter dynamic strength modular structure based on staggered frequency design |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113148231A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102494193A (en) * | 2011-12-12 | 2012-06-13 | 北京航空航天大学 | Hoop for airplane hydraulic pipeline and design method thereof |
| CN108595794A (en) * | 2018-04-11 | 2018-09-28 | 北京强度环境研究所 | A kind of pipeline structure oscillating load analysis method |
| CN109374250A (en) * | 2018-12-19 | 2019-02-22 | 西北工业大学 | Aircraft pipeline solid liquid interation test device under multi-source excitation |
| US20190171790A1 (en) * | 2017-12-04 | 2019-06-06 | Board Of Regents, The University Of Texas System | Systems And Methods For Determining A Natural Frequency Of A Structure |
| CN110427677A (en) * | 2019-07-24 | 2019-11-08 | 大连理工大学 | Bend pipe structure Fast design method in a kind of aero-engine external pipeline system |
| CN112260583A (en) * | 2020-11-12 | 2021-01-22 | 南京邮电大学 | Self-frequency-modulation vibration energy collecting device applied to rotating environment |
-
2021
- 2021-05-14 CN CN202110530012.5A patent/CN113148231A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102494193A (en) * | 2011-12-12 | 2012-06-13 | 北京航空航天大学 | Hoop for airplane hydraulic pipeline and design method thereof |
| US20190171790A1 (en) * | 2017-12-04 | 2019-06-06 | Board Of Regents, The University Of Texas System | Systems And Methods For Determining A Natural Frequency Of A Structure |
| CN108595794A (en) * | 2018-04-11 | 2018-09-28 | 北京强度环境研究所 | A kind of pipeline structure oscillating load analysis method |
| CN109374250A (en) * | 2018-12-19 | 2019-02-22 | 西北工业大学 | Aircraft pipeline solid liquid interation test device under multi-source excitation |
| CN110427677A (en) * | 2019-07-24 | 2019-11-08 | 大连理工大学 | Bend pipe structure Fast design method in a kind of aero-engine external pipeline system |
| CN112260583A (en) * | 2020-11-12 | 2021-01-22 | 南京邮电大学 | Self-frequency-modulation vibration energy collecting device applied to rotating environment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2667927B2 (en) | Hose stress relief device | |
| US8042840B2 (en) | Sealed flexible coupling with torsion acceptance | |
| CN107387635A (en) | A kind of oil pipeline three-dimensional bump leveller | |
| AU2010227404A1 (en) | Protective sleeve for a flexible pipe | |
| CN113148231A (en) | Catheter dynamic strength modular structure based on staggered frequency design | |
| CN110770422A (en) | Pipe element with damping element | |
| US20120048645A1 (en) | Muffler for a turbo or piston engine | |
| JP5314727B2 (en) | Instrumentation equipment installation device for stationary engine | |
| JP2002130077A (en) | Fuel injection pipe for common rail-type diesel engine | |
| CN207161186U (en) | The exhaust pipe assembly of internal combustion counterbalance forklift truck | |
| EP3650739B1 (en) | Non-welded type branch piping reinforcement apparatus | |
| CN100572887C (en) | The balance type arced pipe joint that large displacement compensation capability is arranged | |
| JP4433626B2 (en) | Marine hose | |
| CN108253064A (en) | A kind of metal rubber shock absorber and its forming method of bellows support | |
| CN110822208A (en) | Pipeline damping clamp structure | |
| JP2010025348A (en) | Joining member | |
| US7721537B2 (en) | Exhaust assembly | |
| CN207394112U (en) | Marine piping mounting structure | |
| CN215333108U (en) | Supercharger oil inlet pipe easy to install | |
| CN219623439U (en) | Wear-resisting vibration-proof type metal collapsible tube | |
| CN205208024U (en) | Pipe wall vibration when restraining charging pipe and saying efflux and device of mouth of pipe vortex | |
| CN220397796U (en) | Pipeline balancing weight with adjustable inner diameter and air conditioner | |
| CN219198506U (en) | Compensation device | |
| US8727069B1 (en) | Oscillating tube having a segmented coating for damping the tube | |
| CN217208339U (en) | Pipeline flange vibration absorption structure and pipeline assembly |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210723 |
|
| RJ01 | Rejection of invention patent application after publication |