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- Eklöf, Mats, et al.
(författare)
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Workplace intervention for improved risk perception and preventive activity among workers : using hand-held vibrating machines: a pilot study
- 2023
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- This article presents a pilot study of a 1-h workplace educational intervention implemented among ten construction workers who were highly exposed to hand–arm vibration. The intervention combined risk communication and normative expert advice intended to reinforce preventive behaviour related to vibration, noise, and biomechanical loads. Data for this study comprised intervention notes and interview data from interventionists, and pre- and post-intervention interview data from participating workers.The results suggested that the intervention was sensitive to disturbances and should be directed only to motivated workers possessing sufficient self-efficacy, and only in circumstances in which exposure may be controlled on the local workplace level and by locally implemented measures. Unless these conditions are present, the studied intervention may fail to influence preventive behaviour, and may instead cause cognitive dissonance and frustration among participants and interventionists.
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- Söderberg, Anders, et al.
(författare)
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On Airborne Wear Particles Emissions ofCommercial Disc Brake Materials– A Pin on Disc Simulation
- 2008
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- A novel test method was used to study the concentration and size distribution of airborne wear particles from disc brake materials. A pin-on-disc tribometer equipped with particle counting instruments was used as test equipment. Four different nonasbestoses-organic (NAO) linings for the U.S. market and four different low metallic linings for the EU market were tested against material from gray cast iron rotors. The result indicates that the low metallic linings are more aggressive to the rotor material then the NAO linings, resulting in higher amount of wear and concentrations of airborne wear particles. But, although there are variations in the measured particle concentrations, similar size distributions were obtained regardless of lining material.
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- Wahlström, Jens, et al.
(författare)
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Airborne Wear Particles Emissions fromCommercial Disc Brake Materials– Passenger Car Field Test
- 2008
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Most modern passenger cars have disc brakes on the front wheels, which unlike drum brakes are not sealed off to the ambient air. During braking, there is wear to both the rotor and the pads. This wear process generates particles, which may become airborne. In field tests it is difficult to distinguish these particles from others in the surrounding environment. It may be preferable to use laboratory test stands where the cleanness of the surrounding air can be controlled. The validity of these test stands has to be verified by comparison with field tests and therefore a test series has been conducted. These tests were performed in Stockholm, Sweden, in urban traffic. Low metallic type brake pads and gray cast iron rotors were tested. The results indicate that this test methodology can be used to study the number and mass concentrations as well as size distributions of particles generated from car disc brakes. Overall, the measured mean particle number and mass diameters of the airborne particles were 0.39 μm and 1.5 μm, respectively.
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- Wahlström, Jens, et al.
(författare)
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Airborne Wear Particles Emissions ofCommercial Disc Brake Materials– Disc Brake Test Stand Simulations at LowContact Pressures and Rotors Pre-conditionedwith Rust
- 2008
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Most modern passenger cars have disc brakes on the front wheels, which unlike drum brakes are not sealed off to the ambient air. During braking, there is wear to both the rotor and the pads. This wear process generates particles, which may become airborne. A problem with measuring airborne wear particles in field tests is to distinguish them from the background noise. Therefore, a disc brake laboratory test stand that allows control of the cleanness of the surrounding air is used. With this test stand the number and size of the airborne wear particles from the pad to rotor contact can be measured online. In this technical report the results from two test series is presented. The first series were preformed at three brake cylinder pressure levels (1.2, 1.7 and 2.2 bar) and the rotors were pre-conditioned in a climate chamber with an oxide layer (e.g. rust). Ceramic NAO, NAO and low metallic type brake pads were tested. The second test series were conducted at three low brake cylinder pressure levels (0.1, 0.5 and 1 bar) with NAO and low metallic type brake pads, without any oxide layer. Promising results from the first test series indicate that this test stand can be used to study oxide layer removal from the rotor. The results are also promising for the ability to rank the number and size distribution from different pad rotor material combinations. The second test series shows that even at low pressures measurable levels of airborne particles are generated.
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