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  • 1.
    Gretarsson, Snaevar
    et al.
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Lindell, Hans
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    High-Frequency Vibration from Hand-Held Impact Wrenches and Propagation into Finger Tissue2023Inngår i: Proceedings, E-ISSN 2504-3900, Vol. 86, s. 10-, artikkel-id 1Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    High-frequency shock-type vibration (HFV) with a frequency content mainly above 1250 Hz, e.g., from impact wrenches, is likely to cause a significant amount of vibration injuries and even hand-arm vibration syndrome. The objective of this study was to measure vibration up to 100 kHz with a Laser Doppler Vibrometer (LDV) and investigate the variation of vibration over the machine surface, the vibration propagation into finger tissue, and the vibration reduction on the finger tissue due to a foamed polymer layer. Our results showed that the vibration on the handle varies moderately and that the amplitudes are higher on the machine surface. A large proportion of the vibration is transferred into the finger tissue and thereby subjects the finger tissue to high-vibration amplitudes, but it is effectively reduced by a thin layer of foamed polymer.

  • 2.
    Gretarsson, Snaevar
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, IVF.
    Lindell, Hans
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, IVF.
    Nonlinear Tuned Vibration Absorber on Reciprocating Tools2018Inngår i: Proceedings of the 7th American Conference on Human Vibration 2018 / [ed] Peter W. Johnson, 2018, s. 27-28Konferansepaper (Annet vitenskapelig)
  • 3.
    Lindell, Hans
    et al.
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Clemm, Thomas
    STAMI National Institute of Occupational Health in Norway, Norway.
    Gretarsson, Snaevar
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Vibration Reduction of Pneumatic Rock Drill for Rock Face Stabilisation Sector2023Inngår i: Proceedings, E-ISSN 2504-3900, Vol. 6, s. 33-, artikkel-id 33Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Workers in the rock face stabilisation sector are exposed to high levels of vibration from pneumatic rock drills, which can lead to vibration injuries. The work situation is also ergonomically challenging since the work often is performed on steep cliffs with heavy equipment and a substantial degree of dust exposure. To reduce exposure to vibrations, the equipment has been redesigned, including the machine’s handle, feeding hoist and the implementation of a reciprocating mass generating a counter force to reduce the vibrations. As a side project, a dust removal device was also developed. It was shown that vibration and dust exposure can be substantially reduced.

  • 4.
    Lindell, Hans
    et al.
    RISE., Swerea, IVF.
    Gretarsson, Snaevar
    RISE., Swerea, IVF.
    Machems, Michael
    RISE., Swerea, IVF.
    High frequency shock vibrations and implications of ISO 5349 – Measurement of vibration, simulating pressure propagation, risk assessment and preventive measures2017Rapport (Annet vitenskapelig)
  • 5.
    Lindell, Hans
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, IVF.
    Gretarsson, Snaevar
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, IVF.
    Machens, Michael
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, IVF.
    High frequency shock vibrations and implications of ISO 5349: Measurement of vibration, simulating pressure propagation, risk assessment and preventive measures2017Inngår i: IFA Report 5/2017e: Review of the International Expert Workshop 2015 in Beijing, 2017, s. 19-30Konferansepaper (Fagfellevurdert)
  • 6.
    Lindell, Hans
    et al.
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Johannisson, Pontus
    Saab, Sweden.
    Gretarsson, Snaevar
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Definition and Quantification of Shock/Peak/Transient Vibration2023Inngår i: Proceedings, E-ISSN 2504-3900, nr 1, artikkel-id 6Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Vibration injury in the hand–arm system from hand-held machines is one of the most common occupational health injuries. Machines emitting high-frequency shock vibrations, e.g., impact wrenches have since long been identified as a special risk factor. In legislative and standard texts, the terms shock, impact, peak and transient vibration are frequently used to underline the special risks associated with these kinds of vibrations. Despite this fact, in the literature there is not a mathematically stringent definition of either shock vibration or how the amplitude of the shock is defined. In this study, we suggest algorithms for definition and quantification of these terms and apply them to machine vibrations of various kinds.

  • 7.
    Ottosson, Peter
    et al.
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Lindell, Hans
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Gretarsson, Snaevar
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Fingertip Model for Analysis of High-Frequency Vibrations2023Inngår i: Proceedings, E-ISSN 2504-3900, Vol. 88, nr 1, artikkel-id 6Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    High-frequency shock-type vibrations (HFVs) from, e.g., impact wrenches with a frequency content mainly above 1250 Hz have long been suspected to cause a significant number of vibration injuries, HAVS. These vibrations are unregulated in the current standard for risk estimation, ISO 5349-1; thereby, the risk of injury is suspected to be underestimated. The objective of this study was to investigate the effects on finger tissue subjected to HFVs similar to those from impact wrenches by using a 2D finite element model of a fingertip. The model was validated through experiments. Using the input acceleration from the experiments, the model predicted high pressure variation and particular negative pressures at levels close to 0.1 MPa (1 Bar) or more, which are levels where cavitation in liquid can occur, with a detrimental effect on biological systems.

  • 8.
    Pettersson, Carolina
    et al.
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Lindell, Hans
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Gretarsson, Snaevar
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Zero Vibration Injuries—A Swedish Holistic Approach to Reduce Vibration Injury2023Inngår i: Proceedings, E-ISSN 2504-3900, Vol. 86, artikkel-id 25Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Vibration injuries cause significant costs for society, great personal suffering, and often the relocation of personnel within a company. The project “Zero Vibration Injuries” is a Swedish initiative with the objective of taking a holistic approach to the problem, involving all stakeholders. The project’s vision is “Zero Vibration Injuries”. This is achieved by addressing the source of the problem by reducing the vibration levels in hand-held machines and applying the solutions in industry to the benefit of the users.

  • 9.
    Troell, Eva
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, IVF, Tillverkningsprocesser.
    Lindell, Hans
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, IVF.
    Gretarsson, Snaevar
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, IVF, Tillverkningsprocesser.
    Zero Vibration Injuries: Achieved by Machine Redesign2018Inngår i: Proceedings of the 7thAmerican Conference on Human Vibration 2018 / [ed] Peter W. Johnson, 2018, s. 7-8Konferansepaper (Annet vitenskapelig)
  • 10.
    Zimmerman, Jordan
    et al.
    Medical College of Wisconsin, USA.
    Bain, James
    Medical College of Wisconsin, USA.
    Wu, Chaowen
    Medical College of Wisconsin, USA.
    Lindell, Hans
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, IVF.
    Gretarsson, Snaevar
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, IVF.
    Riley, Danny
    Medical College of Wisconsin, USA.
    Five Week Riveting Hammer Vibration: Rat Tail Sensory Nerves2018Inngår i: Proceedings of the 7th American Conference on Human Vibration 2018 / [ed] Peter W. Johnson, 2018, s. 20-21Konferansepaper (Annet vitenskapelig)
  • 11.
    Zimmerman, Jordan J
    et al.
    Medical College of WI, USA.
    Bain, James LW
    Medical College of WI, USA.
    Wu, Chaowen
    Medical College of WI, USA.
    Lindell, Hans
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Gretarsson, Snaevar
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Riley, Danny A
    Medical College of WI, USA.
    Riveting hammer vibration damages mechanosensory nerve endings2020Inngår i: Journal of the peripheral nervous system, ISSN 1085-9489, E-ISSN 1529-8027, Vol. 25, nr 3, s. 279-287Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Background and Aims Hand-arm vibration syndrome (HAVS) is an irreversible neurodegenerative, vasospastic and musculoskeletal occupational disease of workers using powered hand tools. The etiology is poorly understood. Neurological symptoms include numbness, tingling and pain. This study examines impact hammer vibration-induced injury and recoverability of hair mechanosensory innervation. Methods Rat tails were vibrated 12?min/d for 5 wk followed by 5 wk recovery with synchronous non-vibrated controls. Nerve fibers were PGP9.5 immunostained. Lanceolate complex innervation was compared quantitatively in vibrated vs sham. Vibration peak acceleration magnitudes were characterized by frequency power spectral analysis. Results Average magnitude (2515?m/s2, rms) in kHz frequencies was 109 times that (23?m/s2) in low Hz. Percentage of hairs innervated by lanceolate complexes was 69.1% in 5wk sham and 53.4% in 5wk vib generating a denervation difference of 15.7% higher in vibration. Hair innervation was 76.9% in 5wk recovery sham and 62.0% in 5wk recovery vibration producing a denervation difference 14.9% higher in recovery vibration. Lanceolate number per complex (18.4?±?0.2) after vibration remained near sham (19.3?±?0.3), but 44.9% of lanceolate complexes were abnormal in 5 wk vibrated compared to 18.8% in sham. Interpretation The largest vibration energies are peak kHz accelerations (~?100?000?m/s2) from shock waves. The existing ISO 5349-1 standard excludes kHz vibrations, seriously underestimating vibration injury risk. The present study validates the rat-tail, impact hammer vibration as a model for investigating irreversible nerve damage. Persistence of higher denervation difference after 5-week recovery suggests repeated vibration injury destroys the capability of lanceolate nerve endings to regenerate. 

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