Jetbeetle X-150 nearing completion!
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Jetbeetle X-150 nearing completion!
Old habit made me surf by Skyfrog´s homepage to see if anything has happened on the X-150, it was a while since he updated the homepage so I was beginning to think that he gave up the project.
I was very wrong, he has updated the homepage on several fronts lately and the first test run is soon unveiling! Fun fun fun!
http://jetbeetle.com/
//Anders
I was very wrong, he has updated the homepage on several fronts lately and the first test run is soon unveiling! Fun fun fun!
http://jetbeetle.com/
//Anders
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test run
Thank you Anders and Zippiot for your warm support.
During the past period of x150 project, I received many supportive emails from all over the world, they were and still will be in the future, the true driving force of this self-suficient project.
We made oem parts for survival during the past, this month I am still occupied by works of orders filling. I think for two more weeks I can start testing the engine.
The new PR5 (pressure ratio 5.0) compressor is very promising, it will bring x150 to a new stage, I believe. So don't go away, I will show you something interesting !
During the past period of x150 project, I received many supportive emails from all over the world, they were and still will be in the future, the true driving force of this self-suficient project.
We made oem parts for survival during the past, this month I am still occupied by works of orders filling. I think for two more weeks I can start testing the engine.
The new PR5 (pressure ratio 5.0) compressor is very promising, it will bring x150 to a new stage, I believe. So don't go away, I will show you something interesting !
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critical rotational speed (CRS) program
Hi John, thanks for your support too.
I have developed a finite element method based program called CRS (critical rotational speed), for analysing the natural frequencies of micro gas turbine's shaft. I am comparing the program output using benchmarks such as P66 in Kamps' book, and it shows consistency. (in fact ours is more accurate than than kamps', because ours is their lower bound)
I will upload the version 1.0 to our website for free download. The only problem of this program is the user interface, it is written in fortran, not C++, so right now only command line is available. I hope to add window dialog interface if I have time to do it.
I have developed a finite element method based program called CRS (critical rotational speed), for analysing the natural frequencies of micro gas turbine's shaft. I am comparing the program output using benchmarks such as P66 in Kamps' book, and it shows consistency. (in fact ours is more accurate than than kamps', because ours is their lower bound)
I will upload the version 1.0 to our website for free download. The only problem of this program is the user interface, it is written in fortran, not C++, so right now only command line is available. I hope to add window dialog interface if I have time to do it.
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Analysing critical rotational speed of shafts
Case 1. Kamps shaft (illustrated in book Model jet engines 2nd edition, page 66)
D1 = 0.007 (m), diamter of shaft segment 1
D2 = 0.014 (m), diamter of shaft segment 2
D3 = 0.007 (m), diamter of shaft segment 3
L1 = 0.016 (m), length of shaft segment 1 (bearing to c.g. of compressor)
L2 = 0.096 (m), length of shaft segment 2 (bearing to bearing)
L3 = 0.012 (m), length of shaft segment 3 (bearing to c.g. of turbine wheel)
RHO = 7.85 (T/m**3), density of steel
E = 2.070D8 (kN/m**2), young's modulus of steel
Mc = 6.2D-5 (T), lump mass at c.g. of compressor
Mt = 7.0D-5 (T), lump mass at c.g. of turbine wheel
Critical rotational speed :
a. Kamps' book = 136,270 rpm
b. CRS result = 125,200 rpm
Design speed :
105,000rpm
Check our website for details. Kamps' book based on formulae stated by Bohl. Ours based on finite element method.
D1 = 0.007 (m), diamter of shaft segment 1
D2 = 0.014 (m), diamter of shaft segment 2
D3 = 0.007 (m), diamter of shaft segment 3
L1 = 0.016 (m), length of shaft segment 1 (bearing to c.g. of compressor)
L2 = 0.096 (m), length of shaft segment 2 (bearing to bearing)
L3 = 0.012 (m), length of shaft segment 3 (bearing to c.g. of turbine wheel)
RHO = 7.85 (T/m**3), density of steel
E = 2.070D8 (kN/m**2), young's modulus of steel
Mc = 6.2D-5 (T), lump mass at c.g. of compressor
Mt = 7.0D-5 (T), lump mass at c.g. of turbine wheel
Critical rotational speed :
a. Kamps' book = 136,270 rpm
b. CRS result = 125,200 rpm
Design speed :
105,000rpm
Check our website for details. Kamps' book based on formulae stated by Bohl. Ours based on finite element method.
- Attachments
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- CRS02.JPG (6.34 KiB) Viewed 15398 times
Last edited by skyfrog on Sun Jan 21, 2007 1:10 pm, edited 1 time in total.
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Re: Analysing critical rotational speed of shafts
Hi Horace!skyfrog wrote:Critical rotational speed :
a. Kamps' book = 136,270 rpm
b. CRS result = 12,520 rpm
Design speed :
10,500rpm
Is the results correct?
You have 136k RPM for a, 12,5k RPM for b and 10,5k RPM for c!
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A shrill, obnoxious noise/word used by immature people to express happiness or excitement.
Supposedly started in the gamer community, but is now used by any slack-jawed moron to express delight.
A shrill, obnoxious noise/word used by immature people to express happiness or excitement.
Supposedly started in the gamer community, but is now used by any slack-jawed moron to express delight.
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Re: Analysing critical rotational speed of shafts
Oops, typo I've corrected, sorry for that.Fricke wrote: Hi Horace!
Is the results correct?
You have 136k RPM for a, 12,5k RPM for b and 10,5k RPM for c!
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KJ66 shaft analyzed
I got critical rotational speed for KJ66 shaft. My program shows 127k rpm and the max rpm set was 117k rpm, quite reasonable right ?
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- critical rpm for kj66 shaft
- CRS_KJ66.JPG (45.24 KiB) Viewed 15304 times
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CRS program - new user interface is done.
Hi All,
The new user interface for our CRS program is done !
1. It is based on Windows so is very user friendly.
2. It has a convenient file i/o utility so you could store the analysis cases for later run. Some sample input files are included in the installation file (zip file actually :-) unzip and the installation is done).
3. Help button is added just hit the button for instructions of how to use.
4. It is ideal for shaft designers, because now user can fine-tune the input data by trial and error and obtain the critical rpms in a second.
5. Currently only one type of shaft is available in the program, more to come in the subsequent versions !
Any feedbacks are welcomed !
The new user interface for our CRS program is done !
1. It is based on Windows so is very user friendly.
2. It has a convenient file i/o utility so you could store the analysis cases for later run. Some sample input files are included in the installation file (zip file actually :-) unzip and the installation is done).
3. Help button is added just hit the button for instructions of how to use.
4. It is ideal for shaft designers, because now user can fine-tune the input data by trial and error and obtain the critical rpms in a second.
5. Currently only one type of shaft is available in the program, more to come in the subsequent versions !
Any feedbacks are welcomed !
- Attachments
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- New user interface for CRS program
- CRS_Ui.JPG (36.81 KiB) Viewed 14854 times