Describe velocity feedback damping in relation to aircraft systems?
my attempt at an answer:
I know what damping is, and i know what velocity feedback is, I just can see how they fit together. I think it's something along the lines of;
an auxilery power unit has a speed sensor...
Can anyone help me?
I'm doing a question on aircraft propulsion technology and I'm stuck.
The question is:
'If the mass of air through a propeller is 1000 Kg/s, the aircraft's velocity is 100 m/s and the slipstream velocity is 120 m/s, calculate the thrust?
Attempt at answer...
Can anyone help me?
I'm doing a question on aircraft propulsion technology and I'm stuck.
The question is:
'If the mass of air through a propeller is 1000 Kg/s, the aircraft's velocity is 100 m/s and the slipstream velocity is 120 m/s, calculate the thrust?
Attempt at answer...
Hi,
This is a coursework question from my Eng science.
An A.C network consists of a coil of inductance 10mH and series resistance of 25 ohms in parallel with a 50*10-6F capacitor. The A.C supply voltage is 120/0 degrees V at 400Hz.
Draw a well labelled diagram
a) Calculate the current...
nvn:
I have done the FS*P calculation and it works out as 1350kN, (3*450kN). So in MPa would be 1350/7^2 = 27.55 kPa, (kN/m^2). Is this correct?
I'm still confused over the rest of it though, mainly because I keep coming out with the wrong answer.
Using the formula: P = pi^2EI/L^2...
Thanks both for your help.
I have found the eulers formula:
P = pi^EI/ L^2
After transposing the formula to find I :
putting in my numbers of:
P= 450 kN
E = 200 GPa
L = 7 m
I am not sure what these units are (m2/cm2 etc) because E is in GPa and I don't know if I was supposed...
Hi,
Thank you for your reply.
I don't really know what an axial load is!
I can't find it in my textbook. Is it known as something else?
Am I right in thinking the symbol for an axial load is P?
I have looked on the internet but can't seem to find any formulas to work this out...
Hi,
I have a question from an engineering science assignment that I'm stuck on.
1. Select the lightest wide flange section that can be used as a steel column 7 m long tosupport an axial load of 450 kN with a factor of safety of 3. Use 200 MPa as the limit of elasticity, 200 GPa as the...
nvm:
my bending moment diagram goes up to maximum point at 5 m. I know it should start decreasing at 4 m, because max moment occurs at the 4 m point where the 45kN is acting upon the beam. Whatever way, (from right end or left end), I work out the moments at the 5 m point it works out to be...
Jay,
I have drawn a bending moment diagram and a free body diagram (how correct they are I have no idea!). I have my max bending moment happening 1m from one end being 75.96. Th emax bending moment 2m from the one end where the 45kN is works out to be 61.53kNm. I have worked this from both...
Hi all,
I need some help.
Select the lightest wide flange section that can be used as a steel column 7m long tosupport an axial load of 450kN with a factor of safety of 3. Use 200MPa as the limitof elasticity, 200GPa as the modulus of elasticity and assume that the column issimply...
nvm:
Also the correct answer should be
Elastic modulus Z=512.8 cm^3
I don't really understand what i am supposed to be working out...Elastic modulus (which I am given!)
or bending stress.
Thanks
Emma
nvn:
Thank you for your reply.
Sorry that I did not put the units in...this was just me being sloppy!
Radius of gyratio = 14.29 cm
Second moment of area = 10 087 cm^4
Elastic modulus = 571.8 cm^3
Plastic modulus = 653.6 cm^3
I also have the depth of the beam = 352.8 mm
and the...
Jay,
sorry to bother you again but I am stuck...again!
The next part of the question asks me to ...
'Determine the actual maximum bending stress of the selected beam, taking into account the actual weight of the beam as a udl and check whether your selection is still appropriate by...