2010-04-01 12:00 - Messages

Vibration measurements on torque multipliers

It was brought to HSE's attention that torque multipliers were being used instead of impact wrenches in some instances in the workplace. Given that torque multipliers are purely rotary machines, the vibration level is likely to be much lower than that on an impact wrench. HSL had not previously measured the vibration magnitudes associated with the use of torque multipliers and so were asked by HSE to see whether they are a practicable alternative to impact wrenches and to investigate the differences in vibration exposure associated with their use.

Source : http://www.hse.gov.uk/research/rrhtm/rr794.htm

Questionnaire about Low Frequency Noise measurements in rooms

Room modes at low frequencies generate large sound pressure level differences within enclosures. The resulting sound field is complicated and the sound pressure level measurements become very uncertain. Consequently, the measurements of environmental noise in dwellings, of occupational noise exposure, and of sound insulation of façades, are not accurate at low frequencies. A special measurement methodology exists in a few countries. Measurement methods aim to be accurate and reliable, but they can not determine, at the same time, both the existing and the experienced sound field. A questionnaire was created to gather opinions on how measurements should be performed from several experts with experience in low frequency noise measurements in rooms. Twenty-three experts took part in this survey. The results from the questionnaire are presented in this paper. Most participants considered it necessary to standardize a reliable measurement method, but there was no unanimity about what the method should be. The most controversial points of discussion were the locations where the measurements should be taken, and how the measured data should be analyzed. A brief discussion of these points is presented.

Source : David Oliva, Questionnaire about Low Frequency Noise measurements in rooms. Noise Notes, vol. 11, no 4, 2012, p. 3-12. http://dx.doi.org/10.1260/1475-4738.11.4.3

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