Entries by carlosaroeira

Exposure – the most common error

The most common error in the assessment of the exposure of workers to vibration is related to the assigned exposure times. In the case of hand-arm must count the time when the worker is exposed to vibration; one should not count on a period in which a worker has landed the equipment or […]

Industrial ship noise reduction – case study

It is still common to occur, under pressure of circumstances and with some ignorance of current capabilities of the acoustical engineering, the implementation of massive investments, made more or less loose, noise reduction measures. For more at least loose we refer to investments based on "ouvidómetro", almost to divination and without a strong […]

NP2074 – aplicação obrigatória por lei

A Norma Portuguesa NP2074:2015 é de aplicação obrigatória a partir de 14 de janeiro de 2018 According to the Order 19/GND/2017, da POLICIA DE SEGURANÇA PUBLICA, from 14 de julho de 2017, a partir de 14 de janeiro de 2018, é obrigatória a realização de monitorização de vibrações de acordo com a NP 2074:2015, […]

Effects of continuous vibrations in structures DIN 4150-3

Unlike what happens in other countries, the criteria for evaluation of the effect of continuous vibrations in structures are not set out in legislation, in Portugal. To fill this gap the dBwave believed the realization of evaluation of continuous vibrations in structures, According to the methodology of the DIN 4150-3:1999, by IPAC.

Evaluation of discomfort caused by vibrations BS 6472-1

Evaluation of discomfort caused by vibrations BS 6472-1 Accreditation according to ISO 17025 Unlike what happens in other countries, the criteria for evaluation of discomfort caused by vibrations are not laid down in legislation, in Portugal. To fill this gap the dBwave believed the realization of evaluation of discomfort generated in […]

Noise reduction

1) Introduction sound can be air or driving structural conduction. Most sources radiate sound both as otherwise. The following diagram shows that for noise reduction measures can be taken at various levels in the chain: at the source, about the means of propagation, in interfaces […]

Evaluation of exposure of workers at vibrations – hand arm

1 – INTRODUCTION During our day-by-day we are exposed to vibration, one way or another, in cars, buses, train, etc. Many people are also exposed to other vibrations, during your work, for example those produced by hand tools, machines or heavy vehicles. Here will be only referred to the undesirable vibrations: the effect […]