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October 16, 1998
QuestChat with Stephen Jaeger

Aeroacoustics Engineer
NASA Ames Research Center, Moffett Field, CA

Stephen's featured URLs are:
http://aocentral.arc.nasa.gov
http://ccf.arc.nasa.gov/wind_tunnel/homepage.html
http://www.mme.tcd.ie/~m.carley/Acoustics/faq.html



[ Oran/NASAChatHost - 0 - 09:16:26 ]
Hello to our early arriving Aerospace Team Online chat participants! Today's Aerospace Team Online chat with Stephen Jaeger from NASA Ames Research Center will begin at 10:00 a.m., Pacific Time. Be sure you have read Stephen's autobiography at http://quest.arc.nasa.gov/aero/team/jaeger.html before joining this chat.

[ Oran/NASAChatHost - 1 - 09:17:21 ]
Once the chat begins, Stephen will attempt to answer as many of your questions as he can, but please be patient. The chat will "moderated" if Stephen gets behind in answering your questions. This means that only a few questions will be posted to the chat room at a time. Don't worry if your questions do not appear on your screen immediately. They will be posted as Stephen answers those ahead of you.

[ Oran/NASAChatHost - 2 - 09:18:50 ]
As a reminder, remember to enter "Your Handle" in the box provided, before posting questions to the chat room. Once you've done this, please let us know that you have logged on for today's chat.

[ Oran/NASAChatHost - 3 - 09:19:21 ]
At the conclusion of today's chat, we ask that you take a few minutes to let us know what you thought about it. For your convenience, you may use our online feedback forms at http://quest.arc.nasa.gov/qchats/qchat-surveys. We look forward to hearing from you!

[ Oran/NASAChatHost - 5 - 10:03:43 ]
RE: [Michelle-Mrs.Mock/MontessoriSchoolofCorona] Hello Oran and Steve.
Hello and welcome to today's Aerospace Team Online chat with Stephen Jaeger from NASA Ames Research Center! Aeroacoustics is the study of aircraft noise. Stephen's responsibilities in this area include developing tools for measuring aircraft noise, and conducting acoustics research on wind tunnel models of supersonic jets, airliners and aircraft engines. He also builds new test instruments, designs equipment, analyzes noise data, and presents the results of wind tunnel tests.

[ Oran/NASAChatHost - 6 - 10:04:02 ]
And now, here is Stephen Jaeger to answer your questions.

[ StephenJaeger/ARC - 7 - 10:04:15 ]
RE: [Michelle-Mrs.Mock/MontessoriSchoolofCorona] Hello Oran and Steve.
Hello

[ StephenJaeger/ARC - 8 - 10:05:30 ]
How is everyone doing?

[ StephenJaeger/ARC - 10 - 10:06:44 ]
RE: [Michelle-Mrs.Mock/MontessoriSchoolofCorona] I am chatting without students today, so my questions are related to things my students and my own children might want to know.
No problem, we are all students, I guess.

[ StephenJaeger/ARC - 13 - 10:10:55 ]
RE: [Michelle-Mrs.Mock/MontessoriSchoolofCorona] I was curious about the acoustics in a wind tunnel. I read somewhere that the wind tunnel tries to duplicate the outside environment as far as noise - how can this be done in an enclosed space.
Its not very easy. There are two ways to do it. One is to use an "open jet" tunnel where the wind is blown into an anechoic room . You place the microphones outside of the air jet and measure the noise of the models inside the jet of air. The problem is you have to account for the effect on the noise as it passes through the jet. The other way is a "closed jet" wind tunnel where the microphones are inside the air jet.

[ StephenJaeger/ARC - 14 - 10:12:42 ]
RE: [Michelle-Mrs.Mock/MontessoriSchoolofCorona] My son (10th grade) wants to know what kind of a student you were in High School.
I was an average student (B's and C's) until I realized that I had to get more serious. When I became a junior I was getting mostly A's. I was always capable of it but I just wasn't trying hard enough before then.

[ StephenJaeger/ARC - 17 - 10:15:24 ]
RE: [Michelle-Mrs.Mock/MontessoriSchoolofCorona] What is anechoic? In terms younger students can understand.
Sorry about that. (An engineers explanations can get very long-winded if he doesn't use technical words.) Anechoic means that the walls of the room or wind tunnel are treated to absorb sound. In our 40x80 we have 4 foot deep "wedges" made out of fiberglass that absorb the sound. It's kind of like being in a closet.

[ StephenJaeger/ARC - 19 - 10:18:40 ]
RE: [Michelle-Mrs.Mock/MontessoriSchoolofCorona] Do you have any suggestions for HS students who have difficulty getting organized and planning ahead?
I think you need to set a few concrete goals. They can be simple like "I want to be an actor" or "I would like to travel in Europe after I graduate" It doesn't matter if the goals are changed or they are not realized. Once you have done that, research to find out what you need to do to reach those goals. I knew I wanted to be a scientists so I did some reading and found out what sort of classes I needed to take etc. The rest fell into place easily.

[ StephenJaeger/ARC - 20 - 10:20:08 ]
RE: [Michelle-Mrs.Mock/MontessoriSchoolofCorona] Does Ames ever give tours of the wind tunnel?
Very rarely for the general public. I have given personal tours to my friends who ask nicely.

[ StephenJaeger/ARC - 22 - 10:22:15 ]
FYI: I have several web pages I can suggest. The one I have up now gives descriptions of our diverse wind tunnels at Ames. I have another one that describes the 40x80 modification project that I talk about in my latest journal

[ StephenJaeger/ARC - 24 - 10:24:41 ]
RE: [Michelle-Mrs.Mock/MontessoriSchoolofCorona] I liked the advice you gave to students about foreign languages and understanding other cultures. Many occupations require team players and science is a prime example. I have noticed that when my multi-age students participate in chats, they work together as a team. The real time aspect makes them help each other and quickly find how they can best contribute.
The science world has really changed, even in the short time that I have been here. The days of a lone researcher working in her lab in the late hours is quickly dissapearing. My projects involve teams of a dozen people or more. A typical scientific paper may have 6 authors rather than the one or two of 20 years back.

[ StephenJaeger/ARC - 26 - 10:25:45 ]
RE: [Michelle-Mrs.Mock/MontessoriSchoolofCorona] Well, if I am ever in your area and ask nicely might I get a chance? I would love to see the wind tunnel. I personally find it fascinating.
It can be done. Just let me know.

[ StephenJaeger/ARC - 28 - 10:28:24 ]
RE: [Michelle-Mrs.Mock/MontessoriSchoolofCorona] What are your web page suggestions. I cant go there now but I would like to check them out later.
Try these ones. The last is done by a friend of mine and answers questions about acoustics: http://aocentral.arc.nasa.gov, http://ccf.arc.nasa.gov/wind_tunnel/homepage.html, http://www.mme.tcd.ie/~m.carley/Acoustics/faq.html

[ StephenJaeger/ARC - 30 - 10:29:11 ]
RE: [Michelle-Mrs.Mock/MontessoriSchoolofCorona] Are you familiar with the Exploring Aeronautics CD ROM, put out by Susanne Ashby et. al. at Ames? For those reading this chat later, I would like to tell them it is great! The lesson plans are fantastic and included on the CD.
No What's it all about?

[ StephenJaeger/ARC - 32 - 10:31:08 ]
RE: [Michelle-Mrs.Mock/MontessoriSchoolofCorona] I am going to make it a point to visit Ames Research Center.
It's worth the trip. We had an open house here last year. We expected 50,000 people from the local area....220,000 people clogged the freeway to get here. They are still talking about it!

[ Oran/NASAChatHost - 33 - 10:31:49 ]
As a reminder, please provide feedback to us about today's chat, at http://quest.arc.nasa.gov/qchats/qchat-surveys. Those of you observing today's chat may also use our feedback surveys.

[ StephenJaeger/ARC - 35 - 10:34:01 ]
RE: [Michelle-Mrs.Mock/MontessoriSchoolofCorona] In your bio you mentioned how incredibly busy things can get and how you end up working long hours. What is the longest you have ever had to work and how soon before you had to be back at work?
During a major wind tunnel test a few years back I was working 15 hours per day. When I was on graveyard shift I would start working at midnight, leave by 9am and probably venture back to check on things at 4 or 5 PM before going back for a nap. We usually don't mind if we're not too bored.

[ StephenJaeger/ARC - 36 - 10:35:03 ]
RE: [Michelle-Mrs.Mock/MontessoriSchoolofCorona] The CD ROM is all about aviation and aeronautics. It has quick time movies. Shows different types of aircraft. Wind tunnels and other tools. I only just got it so I havent had the opportunity to use it with my students but it answers so much. It is directed at 5th-8th grades.
Where did you get the CD? I'd like to check it out.

[ StephenJaeger/ARC - 40 - 10:39:38 ]
RE: [Michelle-Mrs.Mock/MontessoriSchoolofCorona] From your bio you sound very physically active. Does your job allow you to move about a lot, or do you get stuck at a desk or computer most of the time?
It varies. Lately I have been at the computer a lot. I have been designing microphone arrays using a program called MATLAB (engineers love MATLAB), making computer drawings of future wind tunnel test setups, designing instruments and reviewing data from last summers wind tunnel calibration. At lunchtime I usually go running so I can get back to my "pre-wedding" fitness level.

[ Michelle-Mrs.Mock/MontessoriSchoolofCorona - 41 - 10:40:58 ]
The CD also says: For further info contact NASA CORE mailto:nasaco@leeca.esu.k12.oh.us or (440)774-1051.

[ StephenJaeger/ARC - 42 - 10:41:13 ]
RE: [Michelle-Mrs.Mock/MontessoriSchoolofCorona] I got the CD from Suzanne Ashby (Curriculum Specialist) from Ames. Do you have her e-mail address?
Yeah, I can find her. I'll ask. Craig probably has it and he's just upstairs.

[ StephenJaeger/ARC - 48 - 10:47:29 ]
RE: [Michelle-Mrs.Mock/MontessoriSchoolofCorona] Before time runs out, what else would you want students to know about your job and what you are working on now.
Its been exciting lately. I have a project to test out some concepts for a better microphone array. The microphone array will have 70 microphones mounted on a wall in the NASA AMes 7x10 foot wind tunnel. We will investigating ways of making the background noise (the noise from the air flowing over the microphones) quieter. After that we will use the array in February 2000 to measure he noise of a quarter-scale Boeing 777 in our 40x80 foot winfd tunnel. Big project, lots of visibility.

[ StephenJaeger/ARC - 51 - 10:49:59 ]
RE: [Michelle-Mrs.Mock/MontessoriSchoolofCorona] Also, will you have anything to do with the Wright Flyer tests? My students are fascinated with that project!
Al little bit. My wife and I traveled down to Anaheim with Craig to see the engine runup of the Wright Flyer. They are an excited group down there. I think they are all over 50 and theyt have been working on the project for 18 years? (it took the Wright Bros only 2 years????) ;->

[ StephenJaeger/ARC - 53 - 10:51:09 ]
RE: [Michelle-Mrs.Mock/MontessoriSchoolofCorona] Will you be doing future chats? My (K-6th computer) students would have loved to join me, but there were too many other classroom activities scheduled today. Fridays are difficult.
Yes, I can do other chats. Fridays probably aren't the best days for anyone. This is actually an off day for me.

[ Oran/NASAChatHost - 54 - 10:51:10 ]
RE: [Michelle-Mrs.Mock/MontessoriSchoolofCorona] Oran, what chat room?
You may see a URL next "The expert's featured url" in this chat room. When Stephen or other NASA chat experts post URLs in this chat room, they are "live." I just wanted to let you know Stephen had updated the address. The other URLs he mentioned earlier will be available in the archive of this chat.

[ Oran/NASAChatHost - 58 - 10:53:28 ]
RE: [ket-kethalpak/bristowmiddleschool] hi jaejer
Welcome, ket. Stephen Jaeger is online for a bit longer to answer any questions you have.

[ Oran/NASAChatHost - 60 - 10:54:12 ]
RE: [Michelle-Mrs.Mock/MontessoriSchoolofCorona] Oran, ok I saw it, just didnt understand. Ill check them all. How long before this chat will be archived?
Michelle, we hope to have this chat archive by Monday, at the latest.

[ StephenJaeger/ARC - 61 - 10:54:24 ]
RE: [Michelle-Mrs.Mock/MontessoriSchoolofCorona] The whole concept of wind tunnels and testing noise is really interesting. How do you minimize sound waves bouncing around and does doppler come into play at all?
Ahh, a very excellent technical question. Doppler usually doesn't come into play because there is no relative motion between the fixed wind tunnel model and the microphones. (The sound of course is bent and distorted by the wind velocity somewhat.) But we also intend to use our technology to measure the noise of airplanes flying overhead. In that case, doppler WILL be an issue.

[ StephenJaeger/ARC - 63 - 10:56:54 ]
RE: [Michelle-Mrs.Mock/MontessoriSchoolofCorona] Where in Anaheim are they doing this? Technology speeds things up AND slows things down!
They had rented this little warehouse in East Anaheim off the freeway for the Wright flyer (which is actually quite large.) We hit Disneyland on Saturday night. That was great. We stayed so late they had to kick us out!

[ StephenJaeger/ARC - 65 - 10:58:04 ]
RE: [StephenJaeger/ARC] They had rented this little warehouse in East Anaheim off the freeway for the Wright flyer (which is actually quite large.) We hit Disneyland on Saturday night. That was great. We stayed so late they had to kick us out!
I think it was that town that Richard Nixon was born.

[ Michelle-Mrs.Mock/MontessoriSchoolofCorona - 70 - 10:59:45 ]
Yorba Linda? That is just down the freeway a bit for me.

[ StephenJaeger/ARC - 77 - 11:02:47 ]
RE: [Michelle-Mrs.Mock/MontessoriSchoolofCorona] Yorba Linda? That is just down the freeway a bit for me.
Yorba Linda...that's it. But the Flyer is now up here in Hanger One at Moffett field waiting for it entry into the 40x80.

[ Michelle-Mrs.Mock/MontessoriSchoolofCorona - 79 - 11:03:38 ]
Bummer! Guess I will have to go to Moffet Field!!

[ StephenJaeger/ARC - 66 - 10:58:34 ]
RE: [ket-kethalpak/bristowmiddleschool] what do you think this will lead too in the future
In regards to what?

[ StephenJaeger/ARC - 74 - 11:01:49 ]
RE: [Michelle-Mrs.Mock/MontessoriSchoolofCorona] Who is building the Wright Flyer and who would I contact for more info.
I'm glad you asked.The Los Angeles AIAA ( American Institute odf Aeronautics and Astronautics) Try: http://www.alumni.caltech.edu/~johnlatz/1903.html The web page has wonderful silent movies of the Wright brothers flying.

[ Oran/NASAChatHost - 81 - 11:04:27 ]
RE: [Michelle-Mrs.Mock/MontessoriSchoolofCorona] Who is building the Wright Flyer and who would I contact for more info.
Michelle, we also invite you to visit the Wright Flyer Online Web site, at http://quest.arc.nasa.gov/aero/wright to learn more about the Wright Flyer project.

[ StephenJaeger/ARC - 82 - 11:04:28 ]
RE: [ket-kethalpak/bristowmiddleschool] well what do you think you can do with wind noise. Or what does it show.
Large aircraft like jet liners actually make noise during their landing approaches. We are measuring the noise they make so we can come up with ways to make them quieter so people won't complain about noise so much.

Oran/NASAChatHost - 91 - 11:06:29 ]
RE: [Michelle-Mrs.Mock/MontessoriSchoolofCorona] Oran, can the various urls be listed in the archive? I dont know that I got them all.
Yes, they will be active in the archive. As we develop our chat software, other URLs posted by the NASA expert and chat moderator will be active.

[ StephenJaeger/ARC - 97 - 11:08:33 ]
RE: [Michelle-Mrs.Mock/MontessoriSchoolofCorona] I saw on the news that they just sound proofed a school near Burbank airport. Those poor kids, what they had to put up with! Oh, and the poor teachers. I am glad they fixed this problem.
It keeps me working. I wish we had a magic potion but we don't

[ StephenJaeger/ARC - 101 - 11:09:32 ]
RE: [ket-kethalpak/bristowmiddleschool] any launces soon
Aren't they sending up John Glenn in a few days?

[ Oran/NASAChatHost - 102 - 11:10:00]
RE: [ket-kethalpak/bristowmiddleschool] any launces soon
The launch with John Glenn is currently scheduled to take place on October 29, 1998. Check the NASA home page at http://www.nasa.gov

. [ Oran/NASAChatHost - 92 - 11:07:23 ]
We will now be ending our chat with Stephen Jaeger from NASA Ames Research Center. Thank you for joining us today, and remember to let us know what you thought about today's chat at http://quest.arc.nasa.gov/qchats/qchat-surveys.

[ Oran/NASAChatHost - 95 - 11:07:47 ]
A special thanks to Steve Jaeger for sharing his time and expertise with us online today!

[ Oran/NASAChatHost - 86 - 11:05:19 ]
RE: [Michelle-Mrs.Mock/MontessoriSchoolofCorona] Thank you Oran and thank you Steve. I wish more people had been able to participate today. I am really happy you took the time. Thank you very much!
You're welcome Michelle! Thanks again for joining us today, and we look forward to reading your comments about today's chat!

[ StephenJaeger/ARC - 90 - 11:06:25 ]
RE: [Oran/NASAChatHost] You're welcome Michelle! Thanks again for joining us today, and we look forward to reading your comments about today's chat!
And thank you everyone for giving me a chance to talk about my work.

[ Michelle-Mrs.Mock/MontessoriSchoolofCorona - 96 - 11:08:08 ]
Thank you again!

[ Oran/NASAChatHost - 99 - 11:09:10 ]
Please join us for our next ADTO chat on October 28 with Roxana Greenman from NASA Ames Research Center. Check the ADTO chat schedule page at http://quest.arc.nasa.gov/aero/chats for more information.

 
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