Apologies for the late reply.
Yes, the flow can be adjusted at each outlet to suit the users requirements. I have to provide the same flow at each outlet around the ring main system, my worry is that the furthest outlets from the compressor won't receive enough flow.
Hi All,
Quick question about the flow velocity in an air ringmain piping system. does the flow velocity in the ringmain pipe decrease every time it passes an outlet?
I have a steel block (2.75m x 1.6m x 0.5m) sat at 1000°C in ambient air (22°C)
How long will it take for a surface to drop to say 800°C
should i use the heat transfer eq: Q=KA\DeltaT to find the power in joules per second, then transpose to find seconds somehow?
Any help will be...
but without the pump there would be no pressure in the case of a cylinder stroking. the two things go hand in hand, so you could say the book is half right. just remember this;
FLOW MAKES IT GO!
Yeah if for example an up stroking cylinder were stroking, and someone placed an extra weight on it, the pump motor would have to supply the extra torque to keep the pump spinning which keeps the cylinder stroking with extra load.
The output pressure of the pump will be the pressure that is...
the pump sucks in fluid (say from the rear) at a tiny pressure because the tank it is sucking from is not pressurized (only atmospheric really: 1.01 bar), if there is no load i.e no pressure build up on the front half, the pump is just creating flow really, which is not much use in hydraulics...
just calculate it using the formulas above, work it out for an I value of a hollow section, and then for a solid I value and compare them and see which is most suitable to your design requirements.
high bending stresses are generally a bad occurance. what you should relate a high bending...
say if the d.c motor were a permanent magnet type, would this have the same characteristics?
I presume that they would stay the same, as the magnets do the same 'job' as windings.
Hi all,
Please excuse me for such a simple question, I am a predominantly a mechanical engineer.
Does a series connected D.C Motor have a linear speed/torque relationship or a curve?
I am aware that both have speed (RPM) decreasing as torque (Nm) increases.
Many thanks in advance!
Yes,
using My/I = Stress,
I would be the second moment of area of the beam + gusset second moment of area
y would be the distance from the bottom of the gusset ( or top of the beam) where the centroid lies.
If you don't know the force your lifting you can't choose a motor, and you definitely cannot machine a rack and pinion as you have no idea of the stress the components will be under, which will help you choose the correct module etc.
the weight of the platform is the most important starting...
thanks for that,
however I think I haven't put enough detail into my problem. to find the impact stress I am using an expression from the Roark book on stress and strain where the impact stress can be calculated from a theoretical static stress.
this is the reason I was interested in the...
I am having trouble trying to find the force required to accelerate a wheeled cart. so that i can calculate the bending moment in a stopping bracket,
the bit I am stuck on is The Acceleration of the cart, the situation is;
An 80,000Kg Wheeled cart runs on rails from rest and hits a stop...