Seven researchers working for Mitsubishi in Japan have found a way of making machinery, vehicles and aircrafts operate more silently (New Scientist, Vol 147, No 1997).
When air flows through a pipe, over a wing or into a tunnel, noise is generated. The solution to the problem is to coat any surface in contact with the air with soft fibres. The fibres could be synthetic or natural material, such as animal fur.
The researchers have tested their idea inside a wind tunnel, on the rotor blades of a helicopter and in the pipes of an air conditioner. They have also dressed the overhead power pick-up arms ofa train. In each case, they claim the fur significantly reduced noise.
We are a voice to you; you have been a support to us. Together we build journalism that is independent, credible and fearless. You can further help us by making a donation. This will mean a lot for our ability to bring you news, perspectives and analysis from the ground so that we can make change together.
Comments are moderated and will be published only after the site moderator’s approval. Please use a genuine email ID and provide your name. Selected comments may also be used in the ‘Letters’ section of the Down To Earth print edition.