WO2004097115A1 - Amortisseur pour rail - Google Patents

Amortisseur pour rail Download PDF

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Publication number
WO2004097115A1
WO2004097115A1 PCT/GB2004/001608 GB2004001608W WO2004097115A1 WO 2004097115 A1 WO2004097115 A1 WO 2004097115A1 GB 2004001608 W GB2004001608 W GB 2004001608W WO 2004097115 A1 WO2004097115 A1 WO 2004097115A1
Authority
WO
WIPO (PCT)
Prior art keywords
damper
rail
resonant
deformable material
magnets
Prior art date
Application number
PCT/GB2004/001608
Other languages
English (en)
Inventor
David Farrington
Original Assignee
Corus Uk Limited
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Corus Uk Limited filed Critical Corus Uk Limited
Priority to EP04727603A priority Critical patent/EP1620606A1/fr
Publication of WO2004097115A1 publication Critical patent/WO2004097115A1/fr

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B5/00—Rails; Guard rails; Distance-keeping means for them
    • E01B5/02—Rails
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B19/00—Protection of permanent way against development of dust or against the effect of wind, sun, frost, or corrosion; Means to reduce development of noise
    • E01B19/003—Means for reducing the development or propagation of noise

Definitions

  • the present invention relates to rail dampers. More especially, the invention is concerned with rail dampers that exhibit advantageous noise characteristics.
  • the noise emitted by moving rail vehicles is a major limitation on their use.
  • the noise emitted limits the ability of operators to install new lines in populated areas, and also limits speeds and traffic volumes on existing lines.
  • the noise tends to be dominated by rolling noise from the interface between the steel rails and rail vehicle wheels. This is caused partly by vibration of the wheels and partly by vibration of the track.
  • a rail damper which comprises at least one deformable material attachable to a surface of the rail and a plurality of elongate resonant members.
  • the resonant members are of a stiff material as compared to the deformable material and are sized to form a resonant system with at least two resonances in the frequency range where rail vibration is to be reduced.
  • This Figure shows a vertical section through a rail 1 having a head 2 which carries the traffic and a narrower web 3 extending downwardly from the head 2 to a foot 4 on which the rail section rests.
  • the foot generally wider than both the head 2 and web 3.
  • the junction between the web 3 and the foot 4 is smoothed inter alia for fatigue reasons, but is essentially a transition from a substantially vertical face to a gently downwardly sloping top surface of the foot 4.
  • the angle is in the region of 120°.
  • a damper 5 is provided on each side of the rail.
  • Each damper comprises a block of rubber 6 in which is embedded a first resonant member 7 and a second resonant member 8.
  • the first resonant member is an elongate angled member, the angle corresponding to the junction between the head and foot.
  • the second resonant member is an elongate solid section, positioned in the angle of the first and with two faces at a corresponding angle. The mass per unit length of the first member is greater than that of the second member.
  • the resonant members are discontinuous to allow the damper section to be cut. This eases application of dampers to a rail.
  • a suitable maximum length for the sections is 1 metre for application to existing rail.
  • the damper illustrated in Figure 1 is typically preformed and glued to the rail.
  • the use of adhesive can be disadvantageous on occasions, particularly when there is a requirement to move the position or replace a damper.
  • the present invention sets out to provide an improved rail damper which can readily be repositioned along the length of a rail (or removed) and is an improvement to that disclosed in our earlier European Application.
  • the invention provides a damper for a rail, the damper comprising a section of deformable material defining a face attachable to a surface of the rail, a plurality of elongate resonant members positioned within the deformable material and separate from the attachment face, and one or more permanent magnets positioned at or close to the damper surface for attaching the damper to a steel rail, the resonant members being of a stiff material as compared to the deformable material and being sized to exhibit at least two resonant frequencies in the range of vibration frequencies of the rail.
  • the magnets may be surface mounted or may be set into recesses formed in the damper surface. Alternatively, the magnets may be wholly or partially embedded within the deformable material of the damper.
  • the resonant members are suitably embedded in the deformable material to ensure adequate vibrational transfer from the rail to the resonant members and also provides environmental protection. They are ideally more dense than the resilient material. They are suitably of steel.
  • the deformable member is preferably visco-elastic, for example rubber or a rubber-like material.
  • dampers are attached by magnets to the rail to cover the junction between the web and the foot of the rail. This has been found to be exceptionally advantageous in terms of the amount of damping needed to achieve adequate noise reduction.
  • a damper with at least two resonant frequencies according to the invention reduce significantly the noise level of the rail.
  • One resonant member can be a elongate angled section, the angle preferably matching the angle between external surfaces of the head and foot.
  • Another resonant member can be a solid elongate block, the external faces adjacent the web and foot being angled to match. Further resonant members can be employed as necessary.
  • the damper will be easier to manufacture and easier to apply to existing rail if the resonant members are discontinuous within the deformable material. Ideally, the discontinuities in the plurality of resonant members will coincide. It is also possible to apply the damper in discrete sections, leaving gaps (for example) for rail fasteners. However, a continuous length of damper is preferred.
  • Figure 2 is a vertical section through a rail incorporating dampers in accordance with the invention.
  • FIG. 2 shows a vertical section through a rail fitted with a damper according to the present invention.
  • a damper 10 is positioned at the junctions between the web and foot on each side of the rail.
  • the dampers are identical, which is preferred.
  • each damper comprises a block of rubber 11 in which is embedded a first resonant member 12 and a second resonant member 14.
  • the first resonant member is an elongate angled member. This angle corresponds to the junction between the head and foot.
  • the second resonant member is an elongate solid section, positioned in the angle of the first and with two faces at a corresponding angle. The mass per unit length of the first member is greater than the others, significantly so.
  • the resonant members are discontinuous to allow the damper section to be cut. This eases application of the damper to rail.
  • a suitable maximum length for the sections is one metre for application to existing rail.
  • the top surface of the damper 10 can be profiled to prevent water from building up and seeping into the system.
  • the dampers 10 are attached to the rail by surface mounted permanent magnets 15 set in suitably shaped channels formed in the surfaces of the dampers which contact the web and/or foot of the rail.
  • the magnetic attachment enables the dampers to be re-sited or removed at will.
  • the magnets 15 are embedded within the block of rubber.
  • This arrangement of dampers provides a particularly compact arrangement which is nevertheless able to absorb a wide band of frequencies efficiently from the rail.
  • This frequency band which may be different for vertical and lateral vibration of the rail, is determined by the resonances of the damper. These resonances are controlled by the choice of mass per unit length of the resonant members and by the surrounding geometry and the physical properties (principally the stiffness) of the material between the resonant members.
  • the width of the frequency band is also determined by the damping properties of the visco-elastic material in the inter-layers.
  • the visco-elastic provides a support medium for the resonant members and by its damping properties dissipates vibrational energy.
  • damper Positioning the damper at the junction between the web and foot is particularly efficient for absorption, and also avoids interference with passing wheels, track maintenance operations and rail clips. It is also easily accessible for fitting dampers to existing lengths of rail. The compactness of the damper is significant in minimising the noise radiation from the damper itself.
  • dampers of the present invention could be applied in conjunction with known resilient rail fasteners. This would enable the other advantages of resilient fasteners to be achieved without an unacceptable increase in noise.
  • resonant members could be arrange end-to-end instead of adjacent as illustrated. They would then be in the same mass of deformable material or in adjacent masses.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Railway Tracks (AREA)

Abstract

L'invention concerne un amortisseur (10) pour un rail, lequel comprend une section de matériau pouvant être déformé (11) définissant une face pouvant être fixée sur une surface du rail, ainsi que plusieurs éléments résonnants allongés (12, 14) placés dans le matériau pouvant être déformé et séparés de la face de fixation. Un ou plusieurs aimants permanents (15) sont placés au niveau de la surface de l'amortisseur ou proche de celle-ci pour fixer cet amortisseur à un rail d'acier. Les éléments résonnants sont constitués d'un matériau rigide par rapport au matériau pouvant être déformé et sont calibrés pour présenter au moins deux fréquences de résonance dans la plage des fréquences de vibration du rail.
PCT/GB2004/001608 2003-04-30 2004-04-15 Amortisseur pour rail WO2004097115A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04727603A EP1620606A1 (fr) 2003-04-30 2004-04-15 Amortisseur pour rail

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0309795A GB2401139B (en) 2003-04-30 2003-04-30 Rail dampers
GB0309795.3 2003-04-30

Publications (1)

Publication Number Publication Date
WO2004097115A1 true WO2004097115A1 (fr) 2004-11-11

Family

ID=9957304

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2004/001608 WO2004097115A1 (fr) 2003-04-30 2004-04-15 Amortisseur pour rail

Country Status (3)

Country Link
EP (1) EP1620606A1 (fr)
GB (1) GB2401139B (fr)
WO (1) WO2004097115A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009059512A1 (fr) 2007-11-07 2009-05-14 Wai Lun Ho Dispositif amortisseur de vibrations accordable
CN106894299A (zh) * 2017-03-03 2017-06-27 上海工程技术大学 一种可拆卸的多阶谐振轨道道床动力减振组合体

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2421265A (en) * 2004-12-16 2006-06-21 Tiflex Ltd Railway rail with vibration damper
CN101372823B (zh) * 2008-10-14 2011-07-20 洛阳双瑞橡塑科技有限公司 谐振式动态轨道减振降噪扣件设计方法及结构
CN102373656A (zh) * 2011-11-08 2012-03-14 江阴海达橡塑股份有限公司 钢轨动力吸振器
CN102808364B (zh) * 2012-08-21 2015-03-04 浙江天铁实业股份有限公司 一种钢轨波导吸振消声器
CN107938439A (zh) * 2017-12-20 2018-04-20 中铁二院工程集团有限责任公司 带吸振器阻尼钢轨
CN112030622A (zh) * 2020-09-10 2020-12-04 青岛声达技术有限公司 一种嵌入式轨道动力吸振器
CN114892455B (zh) * 2022-04-29 2024-07-05 厦门振为科技有限公司 一种高耗能减振钢轨的施工安装方法及应用该方法的钢轨

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3722439A1 (de) * 1987-07-07 1987-12-23 Schwartz Heinz Vorrichtung zur reduzierung von schallenergie am verkehrssystem rad/schiene
DE19606565A1 (de) * 1996-02-22 1997-08-28 Hermann Ortwein Kammerfüllprofile für Schienen für Schienenfahrzeuge
EP1186710A2 (fr) * 2000-09-11 2002-03-13 Johann Resch Amortissement acoustique d'âme de rail

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO321566B1 (no) * 1996-11-26 2006-06-06 Kasei Co C I Fremgangsmate for demping av vibrasjoner i en vibrerende overflate.
GB9719864D0 (en) * 1997-09-19 1997-11-19 Univ Southampton Rail damper

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3722439A1 (de) * 1987-07-07 1987-12-23 Schwartz Heinz Vorrichtung zur reduzierung von schallenergie am verkehrssystem rad/schiene
DE19606565A1 (de) * 1996-02-22 1997-08-28 Hermann Ortwein Kammerfüllprofile für Schienen für Schienenfahrzeuge
EP1186710A2 (fr) * 2000-09-11 2002-03-13 Johann Resch Amortissement acoustique d'âme de rail

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009059512A1 (fr) 2007-11-07 2009-05-14 Wai Lun Ho Dispositif amortisseur de vibrations accordable
EP2207934A1 (fr) * 2007-11-07 2010-07-21 Wai Lun Ho Dispositif amortisseur de vibrations accordable
EP2207934A4 (fr) * 2007-11-07 2012-06-20 Ho Wai Lun Dispositif amortisseur de vibrations accordable
CN101849068B (zh) * 2007-11-07 2013-01-02 何伟麟 可调谐震动吸收装置
US8353464B2 (en) 2007-11-07 2013-01-15 Wai Lun Ho Tunable vibration absorbing device
AU2008324609B2 (en) * 2007-11-07 2015-04-23 Wai Lun Ho Tunable vibration absorbing device
CN106894299A (zh) * 2017-03-03 2017-06-27 上海工程技术大学 一种可拆卸的多阶谐振轨道道床动力减振组合体

Also Published As

Publication number Publication date
GB0309795D0 (en) 2003-06-04
GB2401139B (en) 2006-07-12
GB2401139A (en) 2004-11-03
EP1620606A1 (fr) 2006-02-01

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