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Cloueuses portatives - Développement de méthodes de diagnostic vibratoire et acoustique
Le fonctionnement des cloueuses portatives étant basé sur un processus d'impact visant à enfoncer un clou, l'utilisation de ces outils expose les travailleurs à des bruits et à des vibrations à caractère impulsionnel, en générant des niveaux très élevés pendant un très court laps de temps. Par ailleurs, l'exposition aux bruits et aux vibrations impulsionnels engendre un risque de développer des maladies professionnelles. Des échanges avec l'Association paritaire pour la santé...
Influence des efforts de poussée-préhension et des gants anti-vibratiles sur le transfert des vibrations à la main
Un dispositif expérimental a été mis en place par l'INRS pour mesurer et analyser les effets mécaniques locaux des vibrations transmises au système main/doigts. Ce banc de cartographie d'accélération pourrait être utilisé pour tester et hiérarchiser les performances de solutions anti-vibratiles et celles de matériaux amortissants. Source: http://www.hst.fr/dms/hst/data/articles/HST/TI-NT-50/nt50.pdf
Retrofit anti-vibration devices
A study of their effectiveness and influence on hand-arm vibration exposure This project set out to try to determine what benefits, if any, could be gained in terms of reducing vibration exposure by retrofitting different types of anti-vibration device to different hand-held machines. Four types of device were selected for laboratory investigation: anti-vibration handles, spring balances/tensioners, a vibration reducing flange and chisel sleeves. The results from all the different devices used in this project, with the exception of the chisel sleeves, demonstrated that an end user cannot be confident...
Optimal suspension characteristics for the reduction of the vibrations transmitted by a small pneumatic hammer.
This paper describes a systematic approach for optimizing suspension systems to reduce the vibrations transmitted to workers by hand-held power tools. The optimization is based on modeling tool-operator interactions using a mobility scheme. The tool is modeled as a vibration generator, and its internal impedance is included. A hand–arm impedance matrix is used to model the operator upper limbs. The mobility model is used to identify the optimal suspension characteristics, which in our study were the set of parameters that minimizes the frequency-weighted acceleration at the hand–tool...
A tuned vibration absorber reduces the risk of hand-arm vibration syndrome for a grass trimmer
Prolonged use of electric grass trimmer exposes the user to the risk of hand-arm vibration syndrome. A simple approach for the suppression of hand-arm vibration in electric grass trimmer is presented. The proposed system is a tuned vibration absorber (TVA). The results indicated that minimum vibration level was related to the position of the TVA on the shaft of electric grass trimmer. The tuned vibration absorber when installed to the electric grass trimmer attenuated the vibration total value by 67%. This significantly reduces the risk of hand-arm vibration syndrome. Source : Tuned vibration absorber...
NIOSH thinks of investigating further pain caused by tattoo gun vibration.
A full time tattoo artist posted a question on NIOSH Science Blog (#22): «i have been getting sever numbness and tingling in my finger it will last up to two to three days on times i am getting concerned about the effects the vibration of the tattoo machine may be causing». Amy Mobley and Renguang Dong of NIOSH answered: «The tattoo gun seems similar to some dental tools and it may generate high frequency vibration. At higher frequencies, the vibration-induced problems are mainly in the hand and fingers, such as finger tingling, numbness, pain, and white finger. » They said...
Les outils portatifs pneumatiques
Protégez vos oreilles et vos mains Les outils portatifs pneumatiques génèrent des niveaux de bruit et de vibrations qui, avec les années, peuvent entraîner des effets néfastes sur la santé. La durée et l'intensité de l'exposition au bruit peuvent causer la surdité, tandis que la durée et l'intensité de l'exposition à des vibrations peuvent entraîner le syndrome de Raynaud (blanchiment des doigts) et des troubles musculo-squelettiques. L'IRSST a mesuré les niveaux de bruit et...
Triaxial measurements of the performance of anti-vibration gloves
Previous studies of anti-vibration gloves have typically only considered the effect that a glove might have in the direction of compression of the glove material. This project investigates the performance of an anti-vibration glove taking account of the influence that the glove might have in three axes. This requires consideration of the performance of the glove material in both compression and shear. Since the adoption of the revised international standard ISO 5349-1:2001 in the UK as BS EN ISO 5349-1:2001 and the implementation of the Control of Vibration at Work Regulations 2005, the technique...
Feedback on the noise and hand arm vibration worker involvement pilot project
The Worker Involvement Activity forms part of the Noise and HAV programme. The aim of this activity was to reduce occupational ill health related to noise and HAV exposure by introducing worker participation projects. Twenty eight companies were recruited by HSE to set up worker involvement projects in July 2006. Four of these pilot projects were selected for this in depth feedback study which aimed to: gain views of worker involvement in the decision making process; gain feedback on the usefulness of the support materials; identify processes and difficulties involved in setting up the project;...

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