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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
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
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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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
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
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
  • 1,561
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
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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
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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
  • 791
1 vote

Can this new AC motor/generator design work?

I'm not great with the theory of electromagnetism but the one principle that I do understand is that air gaps are the application killer. Have a look at any electromagnetic circuit and you will see ...
Transistor's user avatar
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1 vote
Accepted

Would you wear out the/a clutch in a modern automatic transmission if you drove 5000 km at 1 km/hr?

Most modern automatic transmissions contain a torque converter which is a special kind of fluid clutch filled with oil which allows slippage between the input and output shafts. And while slipping, ...
niels nielsen's user avatar
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
  • 791
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
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

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