MEASUREMENTS MEMES

The semester is quickly winding down & I figured the @UTSA students in my undergraduate Measurements & Instrumentation class could use some extra credit, so I had them make memes about the class!

Main rules were to keep it clean, relevant to the class, & fun
Needless to say, as this class involves a lot of circuits & statistics, not all of our Mechanical Engineering students are starting from the same place...
The math and statistics were not always easy
And learning to use a micrometer is a bit of a rite of passage for Mech. Eng. undergrads
We learned about correlations (and covered the finer points of r^2, which I am not entirely confident got across)
We covered the Nyquist theorem
Then learned a lot about filter circuits
Unfortunately things covered in lecture don't always go as planned in the lab
There was much fun had with Wheatstone Bridge circuits, which apparently were simultaneously over-complex and underwhelming 😂
There is also clearly a difference of opinion on analog vs. digital data acquisition, which I can respect
I even took some time to introduce optical diagnostic techniques, and it seems to have gone over well
In summary, this is a very fun class (for me at least) and I can't wait to teach it again. I'm glad the students are taking away some valuable knowledge that will translate to their engineering careers

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More from @DrChrisCombs

1 Nov
One of the best low-speed tracking shots of a transient vapor cone I’ve seen, this time on a transonic F-35 at the Pacific Air Show last month #AvGeek

Incredible stuff from Patrick Coyne, who filmed this handheld on a boat!
🎥 instagram.com/p/CUku2KsJBO8/…
A similar shot from the same event (Blue Angels F-18 here), zoomed out to show some more perspective

From this view it’s clear how the vapor cone is just as much a visualization of local moisture content in the air as it is viz of expansion fans!

🎥 instagram.com/p/CUgxW47DTWu/…
Of course, if you’d like to learn more about vapor cones, check out my explainer thread here
Read 4 tweets
21 Oct
Hey @TelegraphNews the correct answer to your poll is "none of the above" because hypersonic speed isn't defined by Mach number, it's about changes in flow chemistry, heating, thin shock/entropy layers, etc.
@TelegraphNews One of my favorite graphics summarizing what truly defines hypersonic flow, from J. Anderson's "Hypersonic and high-temperature gas dynamics"
Hypersonics is definitely having a moment as part of the zeitgeist (seems to happen once or twice a year), but for everyone reporting on this stuff I wish the opening chapter to the Anderson hypersonic text were required reading

It's not too technical and is so informative
Read 8 tweets
30 Jun
I posted this thread on the @ReactionEngines SABRE combined-cycle engine 1 year ago and thought I would provide a quick update

As we predicted, the most immediate impact has been the spin-off of some of the subsystems

For example, the @ReactionEngines heat exchanger was recently integrated into the UK/@esa National Space Propulsion Facility
aerospacetestinginternational.com/news/engine-te…
There have also been recent successful tests of the HX3 micro tube heat exchanger and the hydrogen preburner subsystems

I’ll be honest this is really impressive progress in a COVID year IMO and exceeded my expectations
aerospacetestinginternational.com/news/engine-te…
Read 4 tweets
28 Jun
🌪From the weekend, this is one of the most violent tornado videos I think I’ve ever seen🌪

This was from a tornado outbreak in, of all places, the Czech Republic

The way those trees topple over is unbelievable. That is some incredible wind speed
From a bit further away, this gives you some perspective on the strength of this storm and the level of danger present in the first video

This is the scene afterwards, it looks like a bomb went off. Really bad situation

Read 9 tweets
27 May
There’s been a lot of confusion centered around this (very cool) video of yesterday’s Falcon 9 launch so I wanted to jump in and clear some things up

Short thread…
#AvGeek #Falcon9 #SpaceX @elonmusk
For starters, I recommend checking out this earlier thread I wrote on vapor cones and expansion fans as a lot of relevant points are covered there, so I won’t circle back to everything

This should explain the *transonic* vapor collar close to the rocket
Okay, so the audio in the original video is misleading. This event happened at about 9km altitude, so any wave generated at that instant would reach the ground roughly 30sec later. Not sure how the audio was synced but if it’s real time from the ground, it’s coincidental
Read 10 tweets
22 Apr
It's been a tough semester for everybody, so to lighten the mood and provide some extra credit points I posted a meme challenge to my fluid mechanics class

The submissions were BRILLIANT

Sit back and enjoy this nerdy fluids meme thread. Our @UTSA students rock
#AcademicChatter
There were so many hilarious submissions (over 100!!) so I unfortunately can't highlight them all, but there are some that literally made me LOL
This one is a bit niche perhaps, but it was the perfect mix of educational, weird, and original that it made me laugh harder than perhaps all the rest
Read 18 tweets

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