Design World

  • Home
  • Technologies
    • 3D CAD
    • Electronics • electrical
    • Fastening & Joining
    • Factory automation
    • Linear Motion
    • Motion Control
    • Test & Measurement
    • Sensors
    • Fluid power
  • Learn
    • Ebooks / Tech Tips
    • Engineering Week
    • Future of Design Engineering
    • MC² Motion Control Classrooms
    • Podcasts
    • Videos
    • Webinars
  • LEAP AWARDS
  • Leadership
    • 2022 Voting
    • 2021 Winners
  • Design Guide Library
  • Resources
    • 3D Cad Models
      • PARTsolutions
      • TraceParts
    • Digital Issues
      • Design World
      • EE World
    • Women in Engineering
  • Supplier Listings

Ready For Takeoff: Blues Skies Thinking To Improve Aircraft Safety

By Phys.org | November 29, 2016

Share

Nervous flyers and crew alike would prefer jet airliners not to vibrate so much at take off. Research published in the International Journal of Aerodynamics points to blue skies thinking that might explain the phenomenon and find ways to reduce the safety and image problems associated with this troubling aircraft noise.

Engineer Stanislaw Raczynski of the Universidad Panamericana, in Mexico City, Mexico, has used a gas flow simulation tool to follow the way in which low acoustic oscillations develop on the underside of an aircraft’s wings as it gains speed ready for takeoff. Aside from being noisy and worrying to some passengers, there is a serious engineering issue that can arise if the oscillations match the resonant frequency of the wings or fuselage. Raczynski’s simulations point to specific vibration patterns, their amplitude and frequency, that arise under certain conditions. Perhaps of greatest concern is that he has identified several low, sub-acoustic frequencies (so-called infrasound as opposed to ultrasound which is above the audible frequency range). Such oscillations can produce forces of up to several hundred kilograms per square meter of wing area.

“The air movement around the wing produces several infrasound frequencies, explains Raczynski, “Those oscillations may not be strong enough to cause damage but these frequencies can enter into resonance with the fuselage andproduce quite strong effects.” He adds, that, “During takeoff, such infrasound frequencies may also coincide with the natural frequency of the air column between the wing and the ground which could multiply the effect.”

While there are numerous design features in place in modern aircraft to reduce audible noise and some vibration, these low frequency oscillations are more worrying from a structural engineering point of view. “Model parameters used in simulations are always charged with some degree of uncertainty,” adds Raczynski. “Perhaps, more useful is the qualitative outcome of the simulations, rather than the quantitative results given that the problem is closely connected to aircraft safety”. He concludes that deeper investigations should be carried out to aid the design of new aircraft and avoid accidents.


Filed Under: Aerospace + defense

 

Related Articles Read More >

Flexible rotary shafts support thrust reverser on 150 LEAP 1-A turbofan engines
Drone-mounted inspection breaks barriers for F-35
TriStar, a misunderstood failure of design
Air Force Jet
How drones are advancing metrology for fighter jets

DESIGN GUIDE LIBRARY

“motion

Enews Sign Up

Motion Control Classroom

Design World Digital Edition

cover

Browse the most current issue of Design World and back issues in an easy to use high quality format. Clip, share and download with the leading design engineering magazine today.

EDABoard the Forum for Electronics

Top global problem solving EE forum covering Microcontrollers, DSP, Networking, Analog and Digital Design, RF, Power Electronics, PCB Routing and much more

EDABoard: Forum for electronics

Sponsored Content

  • Global supply needs drive increased manufacturing footprint development
  • How to Increase Rotational Capacity for a Retaining Ring
  • Cordis high resolution electronic proportional pressure controls
  • WAGO’s custom designed interface wiring system making industrial applications easier
  • 10 Reasons to Specify Valve Manifolds
  • Case study: How a 3D-printed tool saved thousands of hours and dollars

Design World Podcasts

May 17, 2022
Another view on additive and the aerospace industry
See More >
Engineering Exchange

The Engineering Exchange is a global educational networking community for engineers.

Connect, share, and learn today »

Design World
  • Advertising
  • About us
  • Contact
  • Manage your Design World Subscription
  • Subscribe
  • Design World Digital Network
  • Engineering White Papers
  • LEAP AWARDS

Copyright © 2022 WTWH Media LLC. All Rights Reserved. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of WTWH Media
Privacy Policy | Advertising | About Us

Search Design World

  • Home
  • Technologies
    • 3D CAD
    • Electronics • electrical
    • Fastening & Joining
    • Factory automation
    • Linear Motion
    • Motion Control
    • Test & Measurement
    • Sensors
    • Fluid power
  • Learn
    • Ebooks / Tech Tips
    • Engineering Week
    • Future of Design Engineering
    • MC² Motion Control Classrooms
    • Podcasts
    • Videos
    • Webinars
  • LEAP AWARDS
  • Leadership
    • 2022 Voting
    • 2021 Winners
  • Design Guide Library
  • Resources
    • 3D Cad Models
      • PARTsolutions
      • TraceParts
    • Digital Issues
      • Design World
      • EE World
    • Women in Engineering
  • Supplier Listings