Aerospace Structures (AEM 341) is a core aerospace engineering course for the study of methods of analyzing advanced beam and stressed skin structures typical of aerospace vehicles. Dr. O’Neill taught this course in the Spring of 2018.Book: Introduction to Aerospace Structural Analysis, Allen & Haisler, Wiley. ISBN 0-471-88839-7 (Book Review)

Goals: By the end of the course, students should be able to:

• Understand structural terminology, nomenclature, and aerospace structural elements.
• Demonstrate basic static and accelerated loads concepts and estimates.
• Determine principle stresses and principle directions
• Demonstrate structural analysis of advanced beams and cells in bending and torsion
• Demonstrate analysis of shear and shear flow
• Analyze, design and test an aerospace structure as a term project
• Fluently converse with loads and stress teams in a design setting

Example Lectures:

• Lesson22-MultiCellTorsion
• Lesson02-Loads.pdf

Course Evaluation: The student course evaluation is at: 18-AEM341-AerospaceStructures. I appreciate the kind words.

• His notes are extremely clear, and he very effectively communicates the material. He’s far more concerned about us understanding the material than anything else.
• Helped me regain my hope and enthusiasm for aerospace

Recently, I have been working with embedded systems for UAS applications. One of the systems requires commands be validated with an XOR checksum. Rather than doing this by hand, I made a small simple Windows app (download here).Nothing fancy.

On 4 May 2018, my Aircraft Systems class (and guests) visited the Southern Museum of Flight in Birmingham, AL. Thanks to the museum director Dr. Brian Barsanti for the guided tour. The highlight of the trip was a hands-on visit of a D-21 recon drone under restoration.

A student asked me what I look for at museums. This is quite an excellent question. The truth is that I’ve been around almost all of the aircraft previously. I’m not looking at the aircraft as a famous name but as an interaction…. an aircraft system. Can I figure out the “why” and “how”?

For the 2016 visit, click on https://charles-oneill.com/blog/southern-museum-of-flight-tour-for-aircraft-systems/

More photos are given below

Continue reading →

Thank you to Adam Benabbou and Sean Sawaya for designing and constructing a new wing for the SPA aircraft. This wing uses the SD7062 airfoil with a balsa and spruce wing structure covered with Monokote. I am looking forward to a series of interesting missions with this aircraft-wing combination.

SPA

On 2 April 2018, NASA’s Supper Guppy flew over Tuscaloosa. Can you spot it?

On 19 March 2018, a tornado hit Jacksonville State University’s campus. The tornado caused widespread damage across the entire campus and the surrounding neighborhoods. The tornado was a direct hit through the quad, library, and almost all major buildings.

The Remote Sensing Center was asked to provide post tornado damage assessment of the campus buildings. We (Tim Leopard, Chris R. Simpson, and I) flew a series of flights over the campus. We wish JSU the best; we hope these helped.

I own a personal license of CATIA v5. A recent Windows 7 update broke CATIA. Here’s how I fixed it:

• Open regedit
• Create “HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\KeyExchangeAlgorithms\Diffie-Hellman”
• New DWORD Value.
• DWORD “ClientMinKeyBitLength”
• Right-click Modify ClientMinKeyBitLength
• Value “00000200” (Hex value)

[Update Feb 2019]

On Windows 10 machines, the default TLS/Schannel cipher is not enabled. When running “DSCheckLS.exe” the license server status will be “NOT RUNNING”.

To fix this, you will need to enable a specific cipher. In an administrator’s powershell, type: Enable-TlsCipherSuite -Name “TLS_DHE_DSS_WITH_AES_128_CBC_SHA”

This is not at all obvious.

[Personal Setup]

• Add C:\ProgramData\DassaultSystemes\Licenses\DSLicSrv.txt
• Occlusion culling
• Turn off Tablet support: Transformation Pad & Gesture Pad
• Assembly Design Update Automatic

The Civil Engineering CE 260 “Surveying” instructor for the Fall of 2017 asked me to give a guest lecture and flight demonstration of UAVs for civil engineering applications. The class began with a short lecture (CE260-UAV) and then transitioned to Bryce Lawn for a demonstration flight over the University of Alabama’s old chapel building. My laboratory took the photos and created a 3D reconstruction of the building suitable for civil engineering analysis.

We concluded with an aerial class photo.

Thank you to the CE 260 class and the Civil Engineering department, especially Profs. Graettinger and Stogner.

For reference, the full raw flight video is here. The careful viewer should note that this flight was conducted in accordance with FAA regulations and University of Alabama requirements. Please don’t replicate this flight without first talking to UA compliance, UA Grounds, and the Tuscaloosa ATC tower.

Today, we learn the basics of aircraft inlet design.

This November, I was asked to provide a substitute lecture to a senior level propulsion class (AEM 408). For this lecture, I attempted to provide the basics of inlet design by discussing the relevant physics and constraints.

Inlet fan face total pressure was introduced as a way to quantify the performance of an inlet and to diagnose common issues.

The concept of boundary layer growth with the inlet’s adverse pressure gradient was reinforced from an earlier Aerodynamics I course.

The lecture notes are available here: https://charles-oneill.com/docs/InletTalkAEM408.pdf

Thanks and best wishes to the UA Aero Seniors.

Dr. O’Neill