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Träfflista för sökning "WFRF:(Torstensson Astrid) srt2:(2020-2024)"

Sökning: WFRF:(Torstensson Astrid) > (2020-2024)

  • Resultat 1-7 av 7
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1.
  • Eriksson, Olle, 1967-, et al. (författare)
  • Statistical analysis of curve squeal based on long-term onboard noise measurements
  • 2022
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • Curve squeal with large magnitude tonal components in the frequency range up to 10 kHz is a cause of annoyance without any satisfying solution. This might be partly due to the gaps in the current understanding of the phenomenon within the research community (e.g. the open question whether the fundamental excitation mechanism is due to “falling friction” or “modal coupling”). Rail-bound traffic is expected to become a backbone in the future sustainable public transportation system. This makes it urgent to increase the state of knowledge in order to develop effective mitigation measures against the problem.Noise recorded by an onboard monitoring system during one year of traffic on the Stockholm metro is studied. The influence of selected variables on the generation of curve squeal is investigated in a statistical assessment. The influence of curve radius on curve squeal probability is estimated by calculating the quotient of squealing samples with respect to the total number of samples captured in circular curve sections. Vehicle speed (operative conditions) is modelled by the introduction of a classification representing different speed profiles (e.g. constant, linear acceleration or deacceleration, etc.). Environmental conditions are accounted for by using humidity and air temperature as predictor variables.A general trend of increased probability of curve squeal for decreasing curve radius is observed. Several subsequent regression analyses could not find a consistent influence of air temperature and humidity on the occurrence of curve squeal. Moreover, preliminary results indicate the existence of a vehicle speed for which a curve is particularly prone to generate squeal noise.
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2.
  • Eriksson, Olle, 1967-, et al. (författare)
  • Survey of Curve Squeal Occurrence for an Entire Metro System
  • 2024
  • Ingår i: Noise and Vibration Mitigation for Rail Transportation Systems. - : Springer. - 9789819978519 - 9789819978526 ; 14th International Work-shop on Railway Noise, IWRN 2022, s. 483-490
  • Bokkapitel (refereegranskat)abstract
    • The current work presents a statistical analysis based on data collected during approximately 1.5 years of regular operation by two vehicles equipped with an on-board noise monitoring system on the Stockholm metro. Data covers 379,776 passages through 143 curves with radii up to 1000 m. Binary logistic regression is used to investigate the importance of curve radius, vehicle speed, relative humidity, air temperature, rail grinding and vehicle individual on curve squeal. Curve squeal occurrence shows an inverse proportionality with respect to curve radius. This trend is particularly pronounced for curve radii below 600 m. The two vehicles accounted for in the study show differences in propensity to generate squeal. The influence of temperature and relative humidity, and their interaction, on curve squeal is described by an estimated response surface. Results show the occurrence of curve squeal to increase after rail grinding. No strong relationship between curve squeal occurrence and vehicle speed is identified.
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4.
  • Nielsen, Jens, 1963, et al. (författare)
  • Wheel–Rail Impact Loads, Noise and Vibration: A Review of Excitation Mechanisms, Prediction Methods and Mitigation Measures
  • 2021
  • Ingår i: Notes on Numerical Fluid Mechanics and Multidisciplinary Design. - Cham : Springer International Publishing. - 1612-2909 .- 1860-0824. ; 150, s. 3-40, s. 3-40
  • Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
    • Railway noise and ground-borne vibration induced by wheel–rail impact loads are generated by discrete wheel/rail surface irregularities or local deviations in the nominal wheel–rail contact geometry. On the running surface of a rail, a discrete irregularity can be inherent to the railway design, for example at crossings or insulated joints. On the wheel or rail, the irregularity could also be the result of surface damage due to rolling contact fatigue cracking or a consequence of wheel sliding without rolling. This review describes the mechanisms of wheel–rail impact generated by wheel flats, rail joints and crossings. These can be a source of locally increased noise and vibration levels and increased annoyance, as well as of damage to vehicle and track components. The wheel–rail excitation at such irregularities, as indicated by the vertical wheel centre trajectory, leads to an abrupt change of momentum, potentially causing a momentary loss of wheel–rail contact followed by an impact on the rail. The resulting loading is a transient and often periodically repeated event exciting vibration in a wide frequency range with most of the energy concentrated below about 1 kHz. For the numerical prediction of high-magnitude transient loading and situations potentially leading to loss of contact, a non-linear wheel–rail contact model is required, implying that the simulation of contact force is carried out in the time domain. To avoid the need for large, computationally expensive models, a hybrid approach has been developed in which the time history of the contact force is transformed into an equivalent roughness spectrum; this is used as input to frequency-domain models for the prediction of noise and vibration. Since the excitation mechanism is similar to that for rolling noise, the same types of measures to mitigate wheel and track vibration can be applied. However, the main priority should be to control the irregularity by design and regular maintenance.
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6.
  • Pieringer, Astrid, 1979, et al. (författare)
  • Transient Modelling of Curve Squeal Considering Varying Contact Conditions
  • 2024
  • Ingår i: Lecture Notes in Mechanical Engineering. - : Springer. - 2195-4356 .- 2195-4364. ; 14th International Work-shop on Railway Noise, IWRN 2022, s. 491-499, s. 491-499
  • Konferensbidrag (refereegranskat)abstract
    • Modelling railway curve squeal poses a challenge since the phenomenon is non-linear, transient and complex. This work focusses on the transient effects of varying contact parameters on curve squeal. A previously developed high-frequency tool for the simulation of curve squeal in the time domain during quasi-static curving is extended to account for transient curving and connected to a software for the low-frequency vehicle dynamics. An application of the model demonstrates that time-varying contact parameters such as contact position, lateral creepage, and friction coefficient can lead to an on-and offset of squeal. The history of the wheel/rail dynamics can also have an influence on the occurrence of squeal and the selection of the squeal frequency.
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7.
  • Pieringer, Astrid, et al. (författare)
  • Verification of a Transient Model for the Simulation of Curve Squeal on the Basis of On-Board Noise Monitoring Data from Stockholm Metro
  • 2023
  • Ingår i: Proceedings of Fortschritte der Akustik. - : Deutsche Gesellschaft für Akustik (DEGA). ; , s. 693-696
  • Konferensbidrag (refereegranskat)abstract
    • Curve squeal is an intense tonal noise emitted by railway vehicles negotiating tight curves. It is attributed to self-excited vibrations of the railway wheel during ’imperfect’ curving. Modelling curve squeal poses a challenge since the phenomenon is non-linear and transient. In this work, a previously developed model for the simulation of curve squeal during transient curving is verified based on on-board noise monitoring data from Stockholm metro.The time-domain squeal model combines pre-calculated impulse response functions for track and wheel dynamics with Kalker’s variational method for transient rolling contact. The model includes the coupling between vertical and tangential dynamics and considers varying contact positions on wheel and rail along the curve. The low-frequency curving behaviour is included by a pre-calculation with a software for simulation of three-dimensional dynamic vehicle-track interaction.In previous work, a statistical analysis was carried out based on data collected with an on-board noise monitoring system during approximately 1.5 years of regular operation by two vehicles on Stockholm metro. Results showed, amongst others, that curve squeal occurrence increases with decreasing curve radius, and after rail grinding. Simulations are carried out with the curve squeal model to replicate and analyze observations from the noise monitoring on Stockholm metro.
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