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
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
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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)
70 Chancery Lane