Quote from: WarpTech on 07/14/2015 03:51 amQuote from: SeeShells on 07/14/2015 03:24 amDon't have the software to do the integration on the images but I did the large end.I hope you have good solder joints people! The maximum stress seems to ride the seem of the large end. Hence, the use of bolts, not solder to hold it together. Hmmm...It makes sense though, that when the mode energy reaches the big end, it has already expanded. So after that, most of the reflections must be concentrated around the perimeter of the big end. That's why I want to see a simulation of it turned off. I want to see how far back up the frustum the wave goes after it is reflected from the big end, and for how long.ToddSo what levels of force do you expect to be able to break a silver solder joint?
Quote from: SeeShells on 07/14/2015 03:24 amDon't have the software to do the integration on the images but I did the large end.I hope you have good solder joints people! The maximum stress seems to ride the seem of the large end. Hence, the use of bolts, not solder to hold it together. Hmmm...It makes sense though, that when the mode energy reaches the big end, it has already expanded. So after that, most of the reflections must be concentrated around the perimeter of the big end. That's why I want to see a simulation of it turned off. I want to see how far back up the frustum the wave goes after it is reflected from the big end, and for how long.Todd
Don't have the software to do the integration on the images but I did the large end.
Interesting. Just found a 1kW 2.4-2.5GHz Rf amp. Don't think I'll need it for my tests but nice to know it is available.With that Rf amp could maybe generate 1N of Force.
Quote from: SeeShells on 07/14/2015 04:08 amQuote from: WarpTech on 07/14/2015 03:51 amQuote from: SeeShells on 07/14/2015 03:24 amDon't have the software to do the integration on the images but I did the large end.I hope you have good solder joints people! The maximum stress seems to ride the seem of the large end. Hence, the use of bolts, not solder to hold it together. Hmmm...It makes sense though, that when the mode energy reaches the big end, it has already expanded. So after that, most of the reflections must be concentrated around the perimeter of the big end. That's why I want to see a simulation of it turned off. I want to see how far back up the frustum the wave goes after it is reflected from the big end, and for how long.ToddSo what levels of force do you expect to be able to break a silver solder joint?No clue, but... They don't use dozens of small bolts to hold microwave equipment together for nothing. To get a measurable asymmetry between two opposing forces, I assume they are going to need to be quite large forces. But hey, I'm the electronics guy, you need to talk to the structural engineering dept.Todd
Quote from: TheTraveller on 07/14/2015 04:16 amInteresting. Just found a 1kW 2.4-2.5GHz Rf amp. Don't think I'll need it for my tests but nice to know it is available.With that Rf amp could maybe generate 1N of Force.I'm interested TT in something. You said you were going to evacuate your cavity and refill it with something, was it Nitrogen? I don't remember and the search here is lacking.shell
Quote from: SeeShells on 07/14/2015 04:25 amQuote from: TheTraveller on 07/14/2015 04:16 amInteresting. Just found a 1kW 2.4-2.5GHz Rf amp. Don't think I'll need it for my tests but nice to know it is available.With that Rf amp could maybe generate 1N of Force.I'm interested TT in something. You said you were going to evacuate your cavity and refill it with something, was it Nitrogen? I don't remember and the search here is lacking.shellPlan to pump the sealed cavity down as far as my lab pump will go, then back fill with N2 to 2 x atmo. Then repeat the process a few times and finally run at 50% atmo with mostly N2 inside. Done to eliminate as many water molecules as possible.Just realised I didn't show the side wall mounted air valve nor the pressure gauge on the CMS drawing. Plan is to monitor and log the internal cavity N2 pressure along with all the other monitored data.Just found the Raspberry Pi 2B had an inbuilt 3 axis accelerometer. Sweet. Need to check this out further.
No clue, but... They don't use dozens of small bolts to hold microwave equipment together for nothing. To get a measurable asymmetry between two opposing forces, I assume they are going to need to be quite large forces. But hey, I'm the electronics guy, you need to talk to the structural engineering dept.Todd
Extend the small end to nearly a cylinder, like a Trombone. I can't say it is "optimal", because I haven't optimized any equations yet. But given the equations I have, that's what I am thinking.
Quote from: TheTraveller on 07/14/2015 04:45 amQuote from: SeeShells on 07/14/2015 04:25 amQuote from: TheTraveller on 07/14/2015 04:16 amInteresting. Just found a 1kW 2.4-2.5GHz Rf amp. Don't think I'll need it for my tests but nice to know it is available.With that Rf amp could maybe generate 1N of Force.I'm interested TT in something. You said you were going to evacuate your cavity and refill it with something, was it Nitrogen? I don't remember and the search here is lacking.shellPlan to pump the sealed cavity down as far as my lab pump will go, then back fill with N2 to 2 x atmo. Then repeat the process a few times and finally run at 50% atmo with mostly N2 inside. Done to eliminate as many water molecules as possible.Just realised I didn't show the side wall mounted air valve nor the pressure gauge on the CMS drawing. Plan is to monitor and log the internal cavity N2 pressure along with all the other monitored data.Just found the Raspberry Pi 2B had an inbuilt 3 axis accelerometer. Sweet. Need to check this out further.Why N2? O2 is very obvious (love myth busters) because its a Chiral gas you expect any changes?edit readability
Thrust goes as 2*P/c, not 2*P/vg
Quote from: leomillert on 07/13/2015 11:02 pmI have just installed MEEP and NSF-1701.ctl is sitting here on my hard drive.How can I help?Good! Run it and see how the data compares to posted data. In particular, generate some csv files, then "diff" them with the "identical" data on Google drive. If you haven't changed any settings, the data should be there. If you change anything at all, chances are your data will be different. If that is the case post a copy of your file to me and I'll run it as is then post a some csv files back to you.I think that is probably the most straight forward way to check installations. Of course your computer word length may be different so that might not work either.aero
I have just installed MEEP and NSF-1701.ctl is sitting here on my hard drive.How can I help?
Quote from: Rodal on 07/14/2015 03:54 amQuote from: WarpTech on 07/14/2015 03:51 amQuote from: SeeShells on 07/14/2015 03:24 amDon't have the software to do the integration on the images but I did the large end.I hope you have good solder joints people! The maximum stress seems to ride the seem of the large end. Hence, the use of bolts, not solder to hold it together. Hmmm...It makes sense though, that when the mode energy reaches the big end, it has already expanded. So after that, most of the reflections must be concentrated around the perimeter of the big end. That's why I want to see a simulation of it turned off. I want to see how far back up the frustum the wave goes after it is reflected from the big end, and for how long.ToddIt is a location NEAR the big end, but NOT at the big end. I still have to plot the stresses at the big and at the small endsIn order to do that, don't you need csv files at the big and small ends? If so, tell me where they are. That is, what rows of the xz or xy csv files that you have correspond to the big and small ends? Then I can cut x slices at those rows and make the right csv files.
Quote from: WarpTech on 07/14/2015 03:51 amQuote from: SeeShells on 07/14/2015 03:24 amDon't have the software to do the integration on the images but I did the large end.I hope you have good solder joints people! The maximum stress seems to ride the seem of the large end. Hence, the use of bolts, not solder to hold it together. Hmmm...It makes sense though, that when the mode energy reaches the big end, it has already expanded. So after that, most of the reflections must be concentrated around the perimeter of the big end. That's why I want to see a simulation of it turned off. I want to see how far back up the frustum the wave goes after it is reflected from the big end, and for how long.ToddIt is a location NEAR the big end, but NOT at the big end. I still have to plot the stresses at the big and at the small ends