- Edinburgh, City of Edinburgh
The University of Edinburgh is one of the world’s top 20 institutions of higher education.....
- Recruiter: The University of Edinburgh
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Principal Electrical Engineer - Power Join our Electrical Power team and help design the self-contained generation and distribution system for the Successor submarine - a new generation of submarine designed to carry the UK's independent nuclear deterrent
- Recruiter: BAE Systems
- England, Cambridgeshire
- £33000 - £39000 per annum
Operations Supervisor - (Mechanical/Electrical/Instrumentation) Salary: Circa £33k - 39k dependant on experience + vehicle and great additional benefits (share scheme, pension, potential bonus).Location: Wisbech - Cambridgeshire We currently have an excit
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- England, Lancashire
- Competitive package
Would you like to be involved with training UK and international teams in Non Destructive Inspection (NDI) to support the in service fleet (Typhoon Tornado, and Hawk)?
- Recruiter: BAE Systems
- Competitive Salary & Benefits
What?s the opportunity? There are fantastic opportunities in Systems Design for engineers to work within Future Systems. These are highly visible, fast paced roles, in...
- Recruiter: MBDA
- Teddington, United Kingdom
- £24,109 - £27,961 plus EO Electronics PE of £8,090.00
We are now looking for a Metering Engineer to deliver RD’s In-Service Testing (IST) scheme for gas and electricity meters.
- Recruiter: Department for Business, Innovation and Skills
- Shrewsbury, Shropshire
- £46,625 to £57,640 per annum
As an experienced Estates Manager, you will play a key role in helping to shape the future of the Estates service.
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- York, North Yorkshire
- c£45,000 + Car Allowance + Bonus + Excellent Benefits
Nestlé Product Technology Centre in York currently has an excellent opportunity for an Engineering Project Manager
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- Zurich, Canton of Zürich (CH)
The successful candidate is expected to develop a strong and visible research programme in the area of control and diagnostics of building systems
- Recruiter: ETH Zurich
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- £60k - 75k plus extensive Compensation and benefits package, dependent upon experience
Experienced Process Control Leader providing leadership and technical support for Oil Refinery. Extensive Compensation and benefits package.
- Recruiter: Phillips 66
Owl wing design holds lessons for stealth technology
Barred Owl hunting in winter (Credit: David Hemmings)
Understanding owls’ naturally stealthy wing design could help engineers design quieter aircraft, wind turbines and submarines.
Many owl species have developed specialised plumage to effectively eliminate the aerodynamic noise from their wings allowing them to swoop down on prey silently – a feature that could have broad applications for engineers working in fluid dynamics.
A group of researchers from the Lehigh University, USA, lead by Justin Jaworski, assistant professor at the university's Department of Mechanical Engineering and Mechanics are exploring whether owl stealth is based upon a single attribute or the interaction of a combination of attributes.
"Owls possess no fewer than three distinct physical attributes that are thought to contribute to their silent flight capability: a comb of stiff feathers along the leading edge of the wing; a flexible fringe a the trailing edge of the wing; and a soft, downy material distributed on the top of the wing," said Jaworski.
For conventional wings, the sound from the hard trailing edge typically dominates the acoustic signature, but prior theoretical work carried out by Jaworski and Nigel Peake at the University of Cambridge revealed that the porous, compliant character of the owl wing's trailing edge results in significant aerodynamic noise reductions.
"We also predicted that the dominant edge-noise source could be effectively eliminated with properly tuned porous or elastic edge properties, which implies that that the noise signature from the wing can then be dictated by otherwise minor noise mechanisms such as the 'roughness' of the wing surface," said Jaworski.
The velvety down atop an owl's wing creates a compliant but rough surface, much like a soft carpet. This down material may be the least studied of the unique owl noise attributes, but Jaworski believes it may eliminate sound at the source through a novel mechanism that is very different from those of ordinary sound absorbers.
"Our current work predicts the sound resulting from air passing over the downy material, which is idealised as a collection of individual flexible fibres, and how the aerodynamic noise level varies with fiber composition," Jaworski said.
The researchers' results are providing details about how a fuzzy – compliant but rough – surface can be designed to tailor its acoustic signature.
A photographic study of actual owl feathers, carried out with Ian Clark of Virginia Tech, has revealed a surprising 'forest-like' geometry of the down material, so this will be incorporated into the researchers' future theoretical and experimental work to more faithfully replicate the down structure.
Preliminary experiments performed at Virginia Tech show that a simple mesh covering, which replicates the top layer of the 'forest' structure, is effective in eliminating some sound generated by rough surfaces.
"If the noise-reduction mechanism of the owl down can be established, there may be far-reaching implications to the design of novel sound-absorbing liners, the use of flexible roughness to affect trailing-edge noise and vibrations for aircraft and wind turbines, and the mitigation of underwater noise from naval vessels," said Jaworski.
The team is presenting its research at a meeting of the American Physical Society that began yesterday.
"As the dust settles after the referendum result, we consider what happens next. We also look forward to an international summer of sport."
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