Amazon Product Link: Bose QuietComfort 3 Acoustic Noise Cancelling Headphones * * * * * * * * * * * * * * I have take several business trips lately with more to come. One of my pet peeves is hotel room noise from HVAC… Read more
A new helicopter design must undergo thorough testing to ensure the reliability of the design with respect to vibration. A new design undergoing testing may encounter severe vibration while it is on the ground, preparing for takeoff. A similar problem may occur immediately after landing. Many helicopters… Read more
I recently flew from Spokane to Seattle, Washington on an Alaska/Horizon Air Bombardier Q400 aircraft, similar to the one in the above image. This model aircraft has two Pratt & Whitney Canada PW150A turboprop engines. I captured the following video during cruise using a Motorola/Android… Read more
FAA Federal Aviation Regulations FAR-25 Appendix G, Continuous Gust Design Criteria, requires a continuous turbulent gust analysis for transport aircraft. The gust PSD function is given in: The von Karman Vertical Gust Spectrum A Matlab script for generating a continuous gust velocity PSD is given… Read more
There are many variables which affect the touchdown shock level of an aircraft. These include: Descent or sink rate Forward and side velocities Roll, pitch, and yaw angles and corresponding rates Weight and center of gravity Cross wind, wind shear, gusts, etc. Runway contact loads… Read more
I am working on a commerical aircraft project for which the external fluctuating pressure along the fuselage must be predicted for cruise. I have done a preliminary literature survey. I have loosely assembled some reference data and notes in a paper: Jet Aircraft Fuselage External… Read more
The B-52 had about three-fourths of its vertical stabilizer bitten off by 95-mph gusts at 14,300 feet over southern Colorado in 1964. The crew later made a safe landing. * * * I have posted the September 2011 Newsletter at: http://www.vibrationdata.com/Newsletters/September2011_NL.pdf The topics include: Wake… Read more
I have posted a Vibrationdata Newsletter with an aviation theme at: http://www.vibrationdata.com/Newsletters/August2011_NL.pdf The articles include discussions of . . . 1. The XF-84H turboprop aircraft which had supersonic blade tip velocity 2. Aircraft landing shock 3. Turbofan engine buzz-saw noise Military Aircraft Carrier & Normal… Read more