Triennial Report 2003 - CHARMEC

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Vibrations and noise – Vibrationer och buller (VB) – Schwingungen und Geräusche – Vibrations et bruitsVB1. STRUCTURAL VIBRATIONS FROM RAILWAY TRAFFICByggnadsvibrationer från järnvägstrafikGebäudeschwingungen durch EisenbahnverkehrVibrations de bâtiments par le traffic ferroviaireFor photo of Johan Jonsson, see page 28The vb1 project was completed with Johan Jonsson’sdefence in public of his doctoral dissertation in June 2000.Professors Sven Ohlsson and Thomas Abrahamssonsupervised the work. The faculty-appointed externalexaminer of the dissertation was Dr Christian Madshusof the Norwegian Geotechnical Institute (ngi) in Oslo.The title of the dissertation is “On ground and structuralvibrations related to railway traffic”.An important conclusion from the vb1 project was thatonly low-frequency vibrations are effectively transmittedthrough the ground into a nearby building foundation froma passing train. Two- and three-dimensional analytical andnumerical models were developed and applied. Extensivemulti-channel field measurements (in three directions bothat ground surface level and at a depth of 6 m below theground surface) were performed beside the railway at Alvhemnorth of Gothenburg where clay is found to a depthof ca 40 m. Structural vibrations were measured at thesame place on a specially designed concrete slab (0.12 m× 9.00 m × 10.00 m) constructed later on a gravel bed withsteel frames of different resonance frequencies mountedon it. See further the charmec Biennial and TriennialReports from Stages 1 and 2 respectively.Vibrations and noise – Vibrationer och buller (VB) – Schwingungen und Geräusche – Vibrations et bruitsVB2. NOISE FROM TREAD BRAKED RAILWAY VEHICLESBuller från blockbromsade järnvägsfordonRollgeräusche von Zügen mit KlotzbremsenBruits émis par les trains freinés par sabotProject leaderand supervisorAssistant supervisorProfessor Roger Lundén,Applied MechanicsDr Peter Möller,Senior Lecturer,Applied MechanicsDoctoral candidates Mr Tore Vernersson(March 1994 to December 1997;Lic Eng September 1997)Mr Martin Petersson(from January 1998;Lic Eng October 1999)Period 1995-07-01 – 2001-06-30Chalmers budget Stage 1: ksek 700(excluding university Stage 2: ksek 900basic resources) Stage 3: ksek 325Industrial interests Stage 1: ksek 600in-kind budget Stage 2: ksek 900(Adtranz Wheelset/ Stage 3: ksek 200Lucchini Sweden)Note: VB2 has been part of a larger project withparallel funding direct from Adtranz Wheelset(now Lucchini Sweden, see SP1 on page 58).Freight trains run to a large extent at night, and havemoreover proved noisier than passenger trains. The reasonfor the latter is that freight trains are nearly alwaystread braked while passenger trains are disc braked. Thermaland dynamic interaction between the wheel and thebrake blocks causes a corrugated tread on the wheel. Forthe running train this results in oscillating contact forcesthat excite vibrations in the wheel and rail, with noiseradiation as a consequence. The aim of the vb2 projectis to understand the mechanisms behind the growth oftread corrugation and to try to reduce this.Extensive braking experiments have been performedin the test rig (inertia dynamometer) at Surahammar,see page 50, and mathematical modelling and numericalsimulations have been carried out. Brake blocks of castiron, sintered material and composite material have beeninvestigated. See further the charmec Biennial andTriennial Reports from Stages 1 and 2 respectively.The completion of the vb2 project is delayed. MartinPetersson has left Chalmers for employment elsewhere.charmec’s financial contribution to the project endedby 30 June 2001. It is planned, however, that MartinPetersson should complete his doctoral dissertation.Two new reports (to be included in the dissertation)have been published during Stage 3.Martin Petersson: Two-dimensional finite element simulationof the thermal problem at railway block braking, IMechEJournal of Mechanical Engineering Science, vol 216, no C3,2002, pp 259-273Martin Petersson and Tore Vernersson: Noise-related roughnesson tread braked railway wheels – experimental measurementsand numerical simulations, Wear, vol 253, nos 1-2, 2002,pp 301-307 (revised version of conference paper)23
Vibrations and noise – Vibrationer och buller (VB) – Schwingungen und Geräusche – Vibrations et bruitsVB3. TEST RIG FOR RAILWAY NOISEProvrigg för järnvägsbullerPrüfstand für Schallfelder von EisenbahnenBanc de mesure pour bruits ferroviairesThe Railway Noise Test Rig (rntr) has been designedand constructed as planned, and the vb3 project wasfinished by 30 June 2000. A 25 m stretch of full-scaletrack with uic60 rails is used. A further development ofthe rig has taken place in the vb4 project. The rntr isbuilt outdoors on the Adtranz Wheelset (now LucchiniSweden) factory site at Surahammar. A special featureof rntr is that wheelsets and track, which are not inmechanical contact, can be excited both together andseparately (three different tests with the same excitation).The level and directivity of sound from wheelsets(or bogies) and track can thereby be established both intotal and separately. Microphone sweeps are performedover a quarter of a spherical surface. The track can bestatically preloaded. See further the charmec Biennialand Triennial Reports from Stages 1 and 2 respectively.PhD students Tore Vernersson (left) and Carl Fredrik Hartung(right) with their project leader and supervisor Professor RogerLundén in projects VB3 and VB4. Photo taken 2000Railway Noise Test Rig (RNTR) on the premises of Lucchini Sweden at Surahammar24
Page 1 and 2: triennial report1 July 2000 - 30 Ju
Page 3 and 4: CHARMEC RESEARCH 1995-2006Status as
Page 5 and 6: EXECUTIVE SUMMARYcharmec has establ
Page 7 and 8: VISION AND GOALSBOARD AND DIRECTORc
Page 9 and 10: PROGRAMME AREAS CHARMEC STAGE 3Acco
Page 11 and 12: SUMMARY OF CHARMEC STAGE 3 (cont’
Page 13 and 14: Interaction of train and track - Sa
Page 21: Interaction of train and track - Sa
Page 25 and 26: Vibrations and noise - Vibrationer
Page 31 and 32: Materials and maintenance - Materia
Page 47 and 48: Systems for monitoring and operatio
Page 49 and 50: Systems for monitoring and operatio
Page 51 and 52: Parallel EU projects - Parallella E
Page 57 and 58: Parallel special projects - Paralle
Page 59 and 60: ACADEMIC AWARDSThe research in rail
Page 61 and 62: CONFERENCE CM2003 AT CHALMERSThe 6t
Page 63 and 64: RESULTS AND EFFECTS IN INDUSTRYAt t
Page 65 and 66: PARTNERS IN INDUSTRYThe status repo
Page 67 and 68: PARTNERS IN EU PROJECTSOur partners
Page 69 and 70: SPECIAL EVENTS AND ACHIEVEMENTSSome
Page 71 and 72: SPECIAL EVENTS AND ACHIEVEMENTS (co
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SPECIAL EVENTS AND ACHIEVEMENTS (co
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FINANCIAL REPORTHere following are
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FINANCIAL REPORT (cont’d)ogy ab u
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3142Photo: Bo Håkansson, Kamerarep
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Design: Yngve Nygren. Printed by Pa
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Triennial Report 2003 - CHARMEC

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