EP1751777A2 - Procede d'optimisation des parametres de reglage du tressage d'une gaine de blindage sur un faisceau de conducteurs electriques et faisceau ainsi obtenu - Google Patents
Procede d'optimisation des parametres de reglage du tressage d'une gaine de blindage sur un faisceau de conducteurs electriques et faisceau ainsi obtenuInfo
- Publication number
- EP1751777A2 EP1751777A2 EP05775778A EP05775778A EP1751777A2 EP 1751777 A2 EP1751777 A2 EP 1751777A2 EP 05775778 A EP05775778 A EP 05775778A EP 05775778 A EP05775778 A EP 05775778A EP 1751777 A2 EP1751777 A2 EP 1751777A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- braiding
- groups
- spindles
- diameter
- bundle
- 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.)
- Granted
Links
- 238000009954 braiding Methods 0.000 title claims abstract description 82
- 239000004020 conductor Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000005670 electromagnetic radiation Effects 0.000 claims description 21
- 230000003287 optical effect Effects 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 7
- 239000002131 composite material Substances 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000004753 textile Substances 0.000 description 2
- 230000016571 aggressive behavior Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010616 electrical installation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
- H01B13/26—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping
- H01B13/2606—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping by braiding
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/02—Cables with twisted pairs or quads
- H01B11/06—Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
- H01B11/10—Screens specially adapted for reducing interference from external sources
- H01B11/1033—Screens specially adapted for reducing interference from external sources composed of a wire-braided conductor
Definitions
- the present invention relates to a method of optimizing the adjustment parameters of the braiding of a shielding sheath on a bundle of electrical conductors.
- the invention is not limited to this specific application and relates, in general, the realization of sheaths for improving the mechanical strength of elongated objects such as cables, etc.
- shielding sheaths are made from a plaiting or braiding machine such as that described, for example, in patent FR 2 742 772, also of the applicant, which comprises: a plate provided with a passage through which said beam to be sheathed can pass;
- motor means connected to said plate and capable of driving said bobbin feet in sliding paths provided in said plate.
- the number of possible interventions can be very important because of the plurality of adjustment parameters of the braiding machine to be taken into account, namely in particular as explained above:
- the number of braiding strands 3 to 1 1 strands per yarn, for example, forming in this particular case nine groups of yarns,
- the number of spindles that is to say spools: 16, 32, 48 and 64 spindles, for example, forming in this particular case four groups of spindles,
- the electromagnetic protection requirements require thresholds of optical coverage and transfer impedance that should be applied to the shielding of the electrical conductor bundles.
- the mass of the armor must be minimal.
- the mass depends in particular on the optical coverage rate which is defined as the ratio between the surface of a shield on a harness (conductor bundle) and the external surface of said harness.
- the transfer impedance represents the value of the linear electrical resistance as a function of the frequency of electromagnetic radiation.
- the transfer impedance thus directly characterizes the effectiveness of a shield. It is recalled in this connection that two categories of electromagnetic radiation are distinguished.
- the first category relates to electromagnetic radiation whose frequency is between 0 and 400 MHz: they are called duct type because they are transmitted to the ends of a harness and may damage the equipment associated with said harness.
- the second category relates to electromagnetic radiation for which there is dissipation of energy essentially by radiation in the length of the shielding: their frequency is then greater than 400 MHz.
- their frequency is then greater than 400 MHz.
- the associated equipment becomes threatened only to the extent that the higher the frequency, the closer the equipment must occur electromagnetic aggression. If possible, it is then necessary to provide a higher coverage rate locally near the equipment, by reducing the coverage rate, which may be partly current compared with a conventional value at this level.
- the object of the present invention is to overcome these drawbacks and to optimize the productivity of the braiding machines, in particular by reducing the time allowed for reel and spindle changes while respecting the requirements for optical coverage, transfer impedance and mass of a shield. In particular, it allows the protection of harnesses up to frequencies of electromagnetic radiation of the order of 400 MHz, that is to say throughout the frequency range relating to electromagnetic radiation of the duct type.
- the present invention relates to a method of optimizing the adjustment parameters of a braiding machine to achieve in particular a shielding sheath around a bundle of electrical conductors or the like, of the type described above.
- the adjustment parameters correspond in practice, depending on the nature of the material and the diameter of the braiding strand, to:
- a / in a first step I for each diameter of electrical conductor bundles, a first set of groups of spindles and groups of plaiting yarns is determined for which a range of plaiting angles is defined specifically for each yarn, each a range being delimited by minimum and maximum braiding angles within a predetermined range of braiding angles and correspondingly to a predetermined maximum value of the continuous linear electrical resistance and to a minimum value predetermined rate of optical coverage, B / in a second step II, it is verified, for each diameter of electrical conductor bundles and for each group of zones associated with each of the groups of braiding son among those of said first set, that the corresponding transfer impedance is, for each braiding angle included in said range, less than a template representative of the evolution of an upper limit of the transfer impedance as a function of the frequencies of the electromagnetic radiation of the duct type and a second set of groups of spindles and groups of braiding yarns included in said first set, for which an optimum braiding angle corresponds to a minimum mass of the shielding
- a single group of spindles and a single group of braiding yarn are selected from those obtained in said second set and the single corresponding braiding angle of in order to minimize the number of combinations of groups of spindles and groups of plaiting yarns, a different combination being assigned to each different series of consecutive diameters of the bundles of electrical conductors.
- the predetermined maximum value of the continuous linear electrical resistance is defined in the new state of the shielding. As a result, it corresponds to a reduction of a factor k, between 0 and 10, of the value of said continuous linear electrical resistance admitted at the end of the duration of use of a shielded harness to take into account the effects of aging. of this equipment in operation.
- This continuous linear electrical resistance is generally between 5m ⁇ / m and 200m ⁇ / m.
- the optical coverage ratio is greater than a predetermined minimum value, substantially equal to 50% to meet the protection requirements for electromagnetic radiation. However, the value of the optical coverage ratio is preferably greater than 80%.
- the transfer impedance according to the method according to the invention of a shielding is less than a template drawn in a logarithmic scale coordinate system based on 10 so that:
- the cut-off frequency is between 500 KHz and 10 M Hz but preferably close to 1 MHz and the protection is determined up to a maximum frequency relative to electromagnetic radiation of the duct type of the order of 400 MHz.
- the previous growth rate is preferably of the order of 20 dB / decade. It is necessary because of the global consideration of diffusion, diffraction and induction phenomena involved in transfer impedance.
- This mask in the new state of the shielding is deduced by a translation of the acceptable template at the end of the duration of use of a harness along the y-axis and a reduction of the transfer impedance.
- the present invention relates to a single-branch or multi-branch electrical conductor bundle coated with an electromagnetic shielding sheath obtained according to the method described above.
- the present invention also relates to a single-branched or multi-branched electric conductor bundle coated with an electromagnetic shielding sheath, characterized in that the at least one of the branches has a decreasing optical coverage ratio, for example of 100% at 50% for example, depending on the increasing distance from the electrical connectors associated with the branch concerned.
- Figure 1 is a block diagram illustrating the various steps of the method.
- Figure 2 is an example of a template relating to the transfer impedance.
- the method according to the invention consists in optimizing the adjustment parameters of the braiding of a shielding sheath on a bundle of electrical conductors and more particularly in minimizing the number of interventions when the operator must modify said adjustment parameters.
- Another object of the invention is to respect specific conditions relating to the shielding, namely:
- a braiding machine implements a certain number of bobbins equipped with bobbins of threads, themselves consisting of several strands.
- the user consequently selects a braiding machine comprising a particular number of bobbins (and therefore coils) as well as wires comprising a determined number of strands.
- the nature of the material and the diameter of the strands are adapted to the application as well as the braiding angle of the son.
- the user has braiding machines comprising according to FIG. n groups of spindles, each group comprising a different number of spindles (16, 32, 48, ..., spindles),
- each group comprising a different number of strands (3, 7, 9, 11, ..., strands per yarn).
- the braiding machines are capable of braiding a shielding sheath on bundles of electrical conductors of different diameters.
- the object of the invention is therefore to reduce the intervention time to adjust the braiding parameters between each different type of use and consequently to reduce the number of adjustments to be made.
- adjustment parameters must be defined in such a way as to respect the specific conditions previously specified.
- a first step I determines:
- n groups of spindles or bobbins
- m groups of braiding threads for example four groups of spindles respectively comprising 16, 32, 48 and 64 spindles and for example four groups of threads respectively comprising 6 , 7, 9 and 1 1 strands
- a first group of braiding threads allowing: braiding on a diameter ⁇ of a screen whose continuous linear electrical resistance Ro is less than a predetermined maximum value (for example 20 m ⁇ / m) and having a minimum value of the optical coverage rate Kc, example 80%,
- each wire of a braiding angle comprised in a range P, limited by a minimum angle AM I and a maximum angle AMA, this range P being itself within a predetermined range of the braiding angles PDT.
- the PDT range is such that beyond there is a practical impossibility to braiding because the son are then either substantially in a diametral plane of the harness, or substantially parallel to the harness.
- Such a PDT range is generally between 10 ° and 80 ° approximately.
- n 4 (16, 32, 48 and 64 spindles)
- n i is then equal to 3, which corresponds to the use of 16, 32 or 48 spindles.
- a second step II it is verified, for each diameter of electrical conductor bundles and for each group of spindles and braiding son among those of the first set E1, that the corresponding transfer impedance is, for each braid angle included in the previous range P, less than a template G representative of the evolution of an upper limit of the IT transfer impedance as a function of the frequencies of the electromagnetic radiation of the duct type, that is to say for frequencies included between 0 and 400 MHz approximately.
- FIG. 2 is an example of such a template G plotted in a 10 logarithmic scale coordinate system such that:
- the template includes: A first line segment whose ordinate is equal to the predetermined maximum value of the linear electrical resistance Ro, up to the cut-off frequency Fc,
- a second set E2 consisting of n2 groups of spindles (n2 ⁇ n1) and m2 (m2 ⁇ m1) groups of threads by group of spindles is selected in the first set E1 for which the braiding angle is determined.
- optimal AOP and minimum mass MA shielding are selected in the first set E1 for which the braiding angle is determined.
- the method according to the invention is repeated for each consecutive diameter of the bundles of electrical conductors included in said series if.
- Diameter n2 3 of harness 16 spindles 32 spindles 48 spindles
- a single group of spindles and a single group of braiding yarn are selected from those obtained in said second set and the corresponding single braiding angle so as to minimizing the number of combinations of 10 groups of spindles and groups of plaiting yarns, a different combination being assigned to each different series of consecutive diameters of the bundles of electrical conductors.
- the previous example indicates that the solution 48 spindles and 6 strands, is common to each diameter of ⁇ , d ⁇ and d ⁇ bundles of 15 electrical conductors.
- This solution corresponds to a minimum shielding mass for the envisaged applications comprising a plurality of harness corresponding to these different diameters.
- no intervention will be necessary to braid shielding sheaths with diameters of ⁇ , ⁇ or ⁇ : none change of groups of spindles and bobbins, nor any change of groups of threads will be made, only the braiding angle will be changed automatically after a command imposed on the braiding machine according to the following illustration:
- each spool of each spindle being provided with a thread of 7 strands to braid.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Insulated Conductors (AREA)
- Braiding, Manufacturing Of Bobbin-Net Or Lace, And Manufacturing Of Nets By Knotting (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0406019A FR2871286B1 (fr) | 2004-06-03 | 2004-06-03 | Procede d'organisation des parametres de reglage du tressage d'une gaine de blindage sur un faisceau de conducteurs electriques et faisceau ainsi obtenu |
| PCT/FR2005/001340 WO2006000687A2 (fr) | 2004-06-03 | 2005-05-31 | Procede d’optimisation des parametres de reglage du tressage d’une gaine de blindage sur un faisceau de conducteurs electriques et faisceau ainsi obtenu |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1751777A2 true EP1751777A2 (fr) | 2007-02-14 |
| EP1751777B1 EP1751777B1 (fr) | 2017-11-15 |
Family
ID=34945162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP05775778.3A Ceased EP1751777B1 (fr) | 2004-06-03 | 2005-05-31 | Procede d'optimisation des parametres de reglage du tressage d'une gaine de blindage sur un faisceau de conducteurs electriques |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US7311030B2 (fr) |
| EP (1) | EP1751777B1 (fr) |
| CN (1) | CN1961387B (fr) |
| FR (1) | FR2871286B1 (fr) |
| WO (1) | WO2006000687A2 (fr) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8467560B2 (en) * | 2010-09-28 | 2013-06-18 | Apple Inc. | Cables with intertwined strain relief and bifurcation structures |
| CN111523273B (zh) * | 2020-04-16 | 2023-05-05 | 安徽中邦特种电缆科技有限公司 | 一种扁形防波套生产参数计算方法 |
| CN119440117B (zh) * | 2025-01-06 | 2025-05-16 | 杭州三普机械有限公司 | 基于反馈调节的线缆编织机智能控制系统 |
| CN119624045A (zh) * | 2025-02-11 | 2025-03-14 | 泉州装备制造研究所 | 一种基于数字孪生的车间设备资源优化方法 |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4535672A (en) * | 1984-11-20 | 1985-08-20 | James F. Karg | Apparatus for mounting components for rotation of carriers for strand supply bobbins and for timing strand movement relative to rotation |
| US4620473A (en) * | 1985-08-19 | 1986-11-04 | Bull Jeffrey F | Mechanism for timing strand movement relative to rotation of spool holders or carriers for strand supply spools or bobbins |
| WO1996042091A1 (fr) * | 1993-11-29 | 1996-12-27 | Yves Michnik | Dispositif de commande de tressage |
| FR2728113A1 (fr) * | 1994-12-13 | 1996-06-14 | Eurocopter France | Faisceau de conducteurs electriques blinde et son procede de realisation |
| US5594651A (en) * | 1995-02-14 | 1997-01-14 | St. Ville; James A. | Method and apparatus for manufacturing objects having optimized response characteristics |
| FR2731294B1 (fr) * | 1995-03-02 | 1997-05-30 | Labinal | Cable et cablage blindes et leur procede de fabrication |
| FR2742772B1 (fr) * | 1995-12-21 | 1998-02-20 | Eurocopter France | Machine de tressage |
-
2004
- 2004-06-03 FR FR0406019A patent/FR2871286B1/fr not_active Expired - Fee Related
-
2005
- 2005-05-31 EP EP05775778.3A patent/EP1751777B1/fr not_active Ceased
- 2005-05-31 WO PCT/FR2005/001340 patent/WO2006000687A2/fr not_active Ceased
- 2005-05-31 CN CN2005800177034A patent/CN1961387B/zh not_active Expired - Fee Related
- 2005-06-03 US US11/143,636 patent/US7311030B2/en not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2006000687A2 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2006000687A3 (fr) | 2006-07-27 |
| EP1751777B1 (fr) | 2017-11-15 |
| FR2871286B1 (fr) | 2006-08-04 |
| WO2006000687A2 (fr) | 2006-01-05 |
| FR2871286A1 (fr) | 2005-12-09 |
| CN1961387B (zh) | 2010-05-12 |
| CN1961387A (zh) | 2007-05-09 |
| US7311030B2 (en) | 2007-12-25 |
| US20060070517A1 (en) | 2006-04-06 |
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