London Branch

London Branch Evening Meeting LSBU MSc Acoustics Student Final Projects Investigation into Urban Cycling-Induced Hand-Arm Vibration1 The effect of occupancy on voice alarm system performance2 Ventilation louvres directivity index guidance validation 3 Presentations by John Cane1, Graeme Littleford2, Jack Traveller3 Thursday 18 July 2019 at 6 pm WSP, 70 Chancery Lane, London, WC2A 1AF

 

 

 London Branch Evening Meeting

LSBU MSc Acoustics Student Final Projects

Investigation into Urban Cycling-Induced Hand-Arm Vibration1

The effect of occupancy on voice alarm system performance2

Ventilation louvres directivity index guidance validation 3

Presentations by

John Cane1, Graeme Littleford2, Jack Traveller3

Thursday 18 July 2019 at 6 pm

WSP, 70 Chancery Lane, London, WC2A 1AF

 

Three of the best final projects of the 2018 Masters course in Environmental and Architectural Acoustics undertaken by students at the London South Bank University will be presented. See the abstracts below.  

 

1- Concerns exist in the community and literature that cycling-induced hand-arm vibration could reach unsafe or unduly uncomfortable levels. Vibration exposure measurements were undertaken on a bicycle for different conditions. Results were assessed against safe and comfortable levels of vibration found in relevant guidance and in occupational regulations. Cycling on typical urban routes was not found to expose riders to levels of hand-arm vibration deemed unsafe by guidance. The effectiveness of traditional and novel suspension in the stem was compared.

2- Voice alarm systems (VA) are critical for life safety in underground platforms during emergency evacuations. Current regulations assume that the VA system performance is worst when the spaces are empty and typically this is how the performance is assessed. This project investigates the effect of increasing occupancy on the VA system performance in an underground platform in terms of increased absorption and increased ambient noise levels.

3- CIBSE Guide B4 presents guidance for predicting the directivity index of ventilation louvres emitting noise to atmosphere at various angles. For louvres of large surface area it predicts very high values of frequency independent attenuation. This is not consistent with theoretical understanding of source directivity. Experimental results strongly suggested that that this prediction method is not sufficiently accurate. Other prediction methods in the literature were also tested. One method showed stronger agreement with the measurements. Further investigation into this method is proposed

 

This event is free to IOA members and the general public, however, numbers are strictly limited and we request that you pre-register for this event by going to the registration page at:

https://www.eventbrite.co.uk/e/institute-of-acoustics-london-branch-meeting-july-2019-tickets-63977203538

 

If you register and are no longer able to attend this event, please cancel your ticket through Eventbrite so that your place can be offered to someone else.

 

The closest underground stations are Chancery Lane (Central line) and Holborn (Central & Piccadilly line).

 

For more details of IOA regional branch activities please refer to the IOA website: www.ioa.org.uk 

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Topics and speakers for the evening meetings are generally identified and organised by the London Branch Committee, but we always welcome new ideas and suggestions for future presentations. If you have any ideas or suggestions, or may even like to give a presentation yourself, please contact the London Branch Committee (Roslyn Andrews: Roslyn.Andrews@aecom.com)

18 July 2019   through   9:00 PM
WSP
70 Chancery Lane
London, WC2A-1AF
United Kingdom

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