Controlling and monitoring railway and train noise in residential and urban areas is a critical function of a railway. The noise generated can be dependent upon the engine, rail cars, rail construction, train speed, and the horn. Modern high speed trains have also created new levels of high frequency noise that create an acoustic disturbance that sounds like an aircraft going by.
By Larson Davis, a division of PCB Piezotronics based in Depew, NEW YORK (USA).
Before you can determine what design changes are appropriate to reduce the noise emitted by a product, you need to be able to characterise it in terms of: Spectral content: The location of the dominant sources. The relative importance of dominant sources. Noise Source Identification employs a number of tools to perform such a characterisation.
By Brüel & Kjær Sound & Vibration Measurement A/S based in Nærum, DENMARK.
Workplace noise monitoring is an interesting subject that can appear complex, but it is always worth remembering what you are trying to achieve. This can be summarised as: ““Minimising or avoiding the risk of noise-induced hearing loss in the workplace to comply with local, noise-based, legislation”” Such legislation is usually based on a European Directive that is then modified to suit the needs of each particular country. For example, in the United Kingdom, the ‘The Control of Noise at Work Regulations 2005’ are based on the European Union Directive 2003/10/EC; usually called “The physical agents (noise)” directive and expanded upon by the Health & Safety Executive.
By Pulsar Instruments plc based in Filey, UNITED KINGDOM.
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