Design World

  • Home
  • Technologies
    • ELECTRONICS • ELECTRICAL
    • Fastening • joining
    • FLUID POWER
    • LINEAR MOTION
    • MOTION CONTROL
    • SENSORS
    • TEST & MEASUREMENT
    • Factory automation
    • Warehouse automation
    • DIGITAL TRANSFORMATION
  • Learn
    • Tech Toolboxes
    • Learning center
    • eBooks • Tech Tips
    • Podcasts
    • Videos
    • Webinars • general engineering
    • Webinars • Automated warehousing
    • Voices
  • LEAP Awards
  • 2025 Leadership
    • 2024 Winners
    • 2023 Winners
    • 2022 Winners
    • 2021 Winners
  • Design Guides
  • Resources
    • Subscribe
    • 3D Cad Models
      • PARTsolutions
      • TraceParts
    • Digital Issues
      • Design World
      • EE World
    • Educational Assets
    • Engineering diversity
    • Trends
  • Supplier Listings
  • Advertise
  • Subscribe

Ready For Takeoff: Blues Skies Thinking To Improve Aircraft Safety

By Phys.org | November 29, 2016

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.

You Might Also Like


Filed Under: Aerospace + defense

 

LEARNING CENTER

Design World Learning Center
“dw
EXPAND YOUR KNOWLEDGE AND STAY CONNECTED
Get the latest info on technologies, tools and strategies for Design Engineering Professionals.
Motor University

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

  • Widening the scope for machine tool designers with FORTiS™ enclosed encoder
  • Sustainability, Innovation and Safety, Central to Our Approach
  • Why off-highway is the sweet spot for AC electrification technology
  • Looking to 2025: Past Success Guides Future Achievements
  • North American Companies Seek Stronger Ties with Italian OEMs
  • Adapt and Evolve
View More >>
Engineering Exchange

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

Connect, share, and learn today »

Design World
  • About us
  • Contact
  • Manage your Design World Subscription
  • Subscribe
  • Design World Digital Network
  • Control Engineering
  • Consulting-Specifying Engineer
  • Plant Engineering
  • Engineering White Papers
  • Leap Awards

Copyright © 2025 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
    • ELECTRONICS • ELECTRICAL
    • Fastening • joining
    • FLUID POWER
    • LINEAR MOTION
    • MOTION CONTROL
    • SENSORS
    • TEST & MEASUREMENT
    • Factory automation
    • Warehouse automation
    • DIGITAL TRANSFORMATION
  • Learn
    • Tech Toolboxes
    • Learning center
    • eBooks • Tech Tips
    • Podcasts
    • Videos
    • Webinars • general engineering
    • Webinars • Automated warehousing
    • Voices
  • LEAP Awards
  • 2025 Leadership
    • 2024 Winners
    • 2023 Winners
    • 2022 Winners
    • 2021 Winners
  • Design Guides
  • Resources
    • Subscribe
    • 3D Cad Models
      • PARTsolutions
      • TraceParts
    • Digital Issues
      • Design World
      • EE World
    • Educational Assets
    • Engineering diversity
    • Trends
  • Supplier Listings
  • Advertise
  • Subscribe
We use cookies to personalize content and ads, to provide social media features, and to analyze our traffic. We share information about your use of our site with our social media, advertising, and analytics partners who may combine it with other information you’ve provided to them or that they’ve collected from your use of their services. You consent to our cookies if you continue to use this website.