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1 vote

If a fluid is incompressible,is it correct to say that the flow may or may not be incompressible?

An incompressible fluid is a fluid whose density does not change when the pressure changes, i.e., $\frac{d\rho}{dp}=0$. Mathematically, we can write: $\frac{d\rho}{dp}=\frac{\partial\rho}{\partial p}+\...
Pustam Raut's user avatar
1 vote

Can I use logarithmic decrement to get damping ratio when given data is acceleration?

Yes, at least if the ringing is sinusoidal. The derivatives of a sinusoid, i.e. velocity and acceleration, are still sinusoids. The magnitude of the derivatives will be enlarged in proportion to the ...
Pete W's user avatar
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3 votes

How did mechanical punched tape readers work?

Back in 1974, 50 years ago, my high school had a couple of Model 33 teletypes (teleprinters) connected to a DEC PDP 11/70 computer. The paper tape readers they had were mechanical ones which fingers, ...
Fred's user avatar
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1 vote

Maximum rate of heat transfer in Effectiveness NTU method for a heat exchanger

We use $\Delta T_{max}$ because it is the difference between the warmest and the coldest temperatures in the system. An infinite counter flow heat exchanger would approach that, but this is an upper-...
Julek's user avatar
  • 111
2 votes

How did mechanical punched tape readers work?

The original punchcard mechanism as used on looms they pushed a set of rods through the card. A weak enough spring will allow the rod to push against the card without damaging it. And then a simple ...
ratchet freak's user avatar
1 vote

How did mechanical punched tape readers work?

The punched tape readers collected the data by shining a light through the holes with sensors to record the patterns. You can get an overview here: https://gcodetutor.com/fanuc-training-course/punch-...
Solar Mike's user avatar
  • 15.8k
2 votes

How do lifts remain steady as passengers embark/disembark?

When an elevator car is stopped, brakes are automatically applied which grasp the vertical rails inside the elevator shaft so the car does not bounce as its load changes. These brakes automatically ...
niels nielsen's user avatar
0 votes

Deflection Equation of a Stepped Beam

Maybe Comsol accounts for shear deflection. This could be the case. You may like to check because some software do. Deflection can be calculated either using the Eulers theory or Timoshenko's theory. ...
Simranjit Singh's user avatar
3 votes
Accepted

How do lifts remain steady as passengers embark/disembark?

First of there will be many cables going through pulleys which increases the effective young's modulus of the suspension mechanism. This will reduce the tendency of the cabin to move as weight is ...
ratchet freak's user avatar
0 votes

Is there any reason why "inner-flange" style train wheels are almost universal?

You need the conical profile (typically about 1:20) both to self-centre the wheelset and to enable it to go round normal curves without slipping- the cause of the wheel squeal you get on tight curves (...
David T's user avatar
  • 11
0 votes

Why Volumetric efficiency is not considered as a performance parameter in case of 2 stroke engines

You are misinterpreting what the volumetric efficiency is in 2-stroke engines. You need a better reference, mine is Internal Combustion Engines by Obert, Harper & Row, 1973. Volumetric (charging) ...
Tiger Guy's user avatar
  • 6,911
0 votes

Mechanical linkage to tilt a monitor around an edge

If you can allow the pivot point to move a bit with motion, then create a 4-bar linkage where the two support arms intersect at the virtual pivot point.
John Alexiou's user avatar
0 votes

Connecting rod sizing

Yes, just ask Professor Boschetto.
user47721's user avatar
0 votes

Where do engineers find the manufacturing processes of objects?

Reverse engineering definition I'd recommend you first look up the definition of "reverse engineering". Right now, you seem to be trying to find a source that directly tells you how a ...
Chris_abc's user avatar
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0 votes

Where do engineers find the manufacturing processes of objects?

I mean, manufacturing is just one of the steps in creating an object. It's like asking how someone knows the theory of a concept, or how someone knows how to design something. They study the subject ...
ISbit's user avatar
  • 1
0 votes

Mechanical linkage to tilt a monitor around an edge

I found s olution using two linkages. The length of the parallel links have to be the same as the distance of connection monitor to rotation point. The lengths of the two connecting links have to be ...
LutzB's user avatar
  • 11
1 vote

Did anyone ever make training wheels for the original Segway personal transporter device?

The whole point of the Segway is that it dynamically vritualizes training wheels: it self-rights. There is a failure mode for Segway operators, where the operator amplifies the training-wheel effect, ...
david's user avatar
  • 811
1 vote

Tesla's resonator -- would that work?

From wikipedia: The oscillator/"earthquake machine" was explored in 2006 in Episode 60 – "Earthquake Machine". The MythBusters made a device powered by electricity rather than ...
david's user avatar
  • 811
1 vote

Would placing sand bags on top of a car's strut housing reduce the jarring impact felt when the car hits a pothole?

The work done by a spring displaced by X units is equal to the potential energy in it: $$ W = \frac{1}{2}kx^2$$ W = work x = displacement k = spring stiffness constant If we reduce $x \ $by $\Delta ...
kamran's user avatar
  • 22.4k
3 votes

Where do engineers find the manufacturing processes of objects?

Take the object fully apart. Inspect each component and consider it. Is it standardized like a screw or gear? If that's the case internet search to see how those are made. Done. Even for parts that ...
Drew's user avatar
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3 votes

Where do engineers find the manufacturing processes of objects?

I can't read your instructor's mind, so I can't be sure this is what they intend, but: the fact you've been asked to disassemble the object suggests to me that you're expected to look for physical ...
Daniel Hatton's user avatar
0 votes
Accepted

What is the hole tolerance in hand tap guide?

So, look up the tap information, and for unc 1/4 - 20 it is 6.35mm outer diameter. You can check here: https://www.engineeringtoolbox.com/unified-screw-threads-unc-unf-d_1809.html Which means to make ...
Solar Mike's user avatar
  • 15.8k
0 votes

What type of engineer/professional designs hydroponic farms?

For anything automation I would find someone in mechatronics they should be able to build you hydroponic system fairly easily.
clayton vogt's user avatar
0 votes

Static Equilibrium of Rigid Bodies

It is not like that. A deforming body would still be in equilibrium after it is done with its deformation. If not it means it would be accelerating per Newton's Law. This applies to a deforming ...
upstream's user avatar
  • 462
0 votes

Example of Extremely Tiny Amount of Horsepower

You. You are a great example of something that in normal activity does about 50W of power, as you move around the kitchen and so on. Sure if you are walking briskly, or running or lifting heavy ...
Greg Locock's user avatar
0 votes

Do tensile and compressive stresses create moments?

For your second and third examples, no, the moments cannot vanish. This is because there is not a force and a moment, that's a simplification that does not apply in those cases. In those cases a ...
Zegpi's user avatar
  • 326
0 votes

Are there any instructions on how to install and run Natran-95?

I just forked the repository, and after a bit of cleanup, I developed the CMakeLists.txt file to compile with CMake. you should be able to compile the code base on ...
Foad's user avatar
  • 249
0 votes

Do tensile and compressive stresses create moments?

All forces opposed by forces not in an opposite vector create moments. By opposite I mean any two vectors that cannot be combined into a single vector, which generally means parallel and opposite. It'...
Tiger Guy's user avatar
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