1 / 19

STEM Community Challenge

STEM Community Challenge. Dr Steve Dorney 16 July 2011. Plan for today. Background Bay House School/Vestas/ISVR – siting wind turbines ALNS/ISVR Consulting/Creative Partnerships – room acoustics The HESTEM “Project brief” document Have a go …

mercury
Download Presentation

STEM Community Challenge

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. STEM Community Challenge Dr Steve Dorney 16 July 2011

  2. Plan for today • Background • Bay House School/Vestas/ISVR – siting wind turbines • ALNS/ISVR Consulting/Creative Partnerships – room acoustics • The HESTEM “Project brief” document • Have a go … • Link to HESTEM curriculum change – environmental engineering consultancy • Future: energy management; waste management

  3. Locating a wind turbine • Loci – see worksheet • Applying technical, legal and social criteria • Design and build at scale on school site • + real-life example/issue • - measurable but invisible impact on school/community • - no legacy

  4. Room acoustics • 3 way project • Consulting experience for University students • Free professional assessment of spaces • Pupils involved in measurement, design and implementation

  5. Four projects undertaken • Investigation of Speech Intelligibility in The BLA Room The Hartley Library • Investigation of the Acoustics of a Science Classroom Mayfield School, Portsmouth • Noise Impact Assessment at a Proposed Skateboard Park Site Greatness Community Association • Investigation of the Acoustics of a School Canteen Admiral Lord Nelson School, Portsmouth

  6. ALNS Stage 1 – measure/report

  7. ALNS Stage 2 – upgrade skills and knowledge

  8. ALNS Stage 3 – design & test

  9. ALNS Stage 4 – select, revise and implement

  10. Room acoustics • Broad range of maths and science • Applying technical, legal and social criteria in tangible (audible!) scenario • Realistic prototyping process • + real-life example/issue • + measurable and high impact on school/community • + environmental and learning legacy

  11. The sample HESTEM brief • www.sonicwonders.org

  12. Have a go … Pressure (Pa) Time (s) Decay is exponential Reverberation time: time for pressure to decay by a factor of 1000 (60dB) RT60 = 3 x RT20 If it’s too long …

  13. The reverberation time of St Paul’s cathedral (at 500Hz) when empty of people is • 3 seconds • 7 seconds • 11 seconds • 15 seconds

  14. Sabine’s formula A is the equivalent area of perfectly absorbing material (in m2) • The internal volume of St Paul’s Cathedral is 152,000m3 and its reverberation time when empty of people is 11 seconds. Calculate: • The equivalent absorption area when the cathedral is empty • The reverberation time when full (2000 people) where each person has an equivalent absorption area of 0.4m2

  15. The reverberation time of St Paul’s cathedral (at 500Hz) when full of people is • Less than 4 seconds • Between 4 and 6 seconds • Between 6 and 8 seconds • Longer than 8 seconds

  16. Predicting absorption area Equivalent absorption area, where a are absorption coefficients …

  17. Challenge 1 Challenge 2 • Estimate the volume of this room. • The reverberation time of this room, if unfitted and unoccupied, would be 3 seconds, say. What is the most cost effective way of fitting it out (including 50 chairs) so as to halve the reverberation time (still unoccupied)? Challenge 3 • Acoustic ceiling tiles are chosen as the sole solution to halve the reverberation time, and the headmaster needs to decide what proportion of the ceiling to have treated. Find an expression for the reverberation time as a function of cost and plot (sketch) the graph.

  18. (for V=1350m3) Of form

  19. Plan for today • Background – community/uni links via STEM? • Bay House School/Vestas/ISVR – siting wind turbines • ALNS/ISVR Consulting/Creative Partnerships – room acoustics • The HESTEM “Project brief” document • Have a go … • Link to HESTEM curriculum change – environmental engineering consultancy • Future: energy management; waste management

More Related