Abstract
Installing high noise barriers on viaducts is a challenging engineering problem because the viaduct structures have long moment arms and require huge viaduct foundations to withstand wind loads. Therefore, it is typically not feasible to retrofit substantial noise barriers on existing viaduct and bridges. To solve this problem, an innovative wind relieving noise barrier patent design is trialled. Multiple Quadratic Diffuser Poles (0.6m in diameter, up to 12m in height) with large gaps of >0.8m are erected for noise reduction experiments. With the large gaps, wind load is reduced by >80% comparing to traditional noise barrier. The noise reduction frequency range is limited about 300 to 1600Hz, where the lower limit is controlled by the pole diameter and an upper limit is controlled by the gap width. The noise reduction performance is an overall effect of four mechanisms of absorption, diffraction, reflection and destructive interference. The experimental results are encouraging, with a gap of ~0.8m still providing a significant noise reduction of 5-10dB over the effective frequency range. The seminar will present noise barrier design, noise reduction theory and field experimental results.
The talk will be followed by a short Q&A session.
Speaker bio
Wilson graduated from ISVR in 1993 and specializes in railway track vibration control, construction noise control and TBM ground noise monitoring and control. He is particularly interested in developing innovative technologies and patenting industrial applications, including railway tuned mass dampers, piling tuned mass dampers, retractable noise barriers and quadratic diffusor poles. His vision is to train young acoustic engineers with a broad focus on innovative acoustic products and knowledge of the patent application process.
Details
As usual, we will be heading to the pub after the talk to catch up and continue the conversation. It would be great to see as many people in person as possible.
Those planning to attend in person MUST register for security access. The link to register for in person attendance can be found below:
https://www.cpdtag.com/app.php?event=85E9C856FF4A919ABEA1186A3E6E82A
Please arrive at 5.45pm for prompt 6pm start. The nearest Tube stations are Aldgate East and Aldgate.
Those joining online do not need to register. Please join with the following Zoom link.
Join Zoom Meeting
https://us02web.zoom.us/j/85476115971?pwd=dXo1aERGaThmVlhwbGFTNGlhb2tmQT09
Meeting ID: 854 7611 5971
Passcode: 794101