Engineering Stack Exchange
Engineering Stack Exchange

Most Popular

more tags
1500 questions
6
votes
2 answers

Does negative pressure inside the barrel affect low-powered railguns?

Just something I was wondering about when I've seen this on reddit today. Unlike in firearms where the pressure propels the projectile, in a railgun, wouldn't the pressure ahead/behind of the projectile slow it down instead? If so, would it be by a…
Llamageddon
  • 209
  • 1
  • 5
6
votes
4 answers

How can I calculate the rate of power consumption of a solar car along a known route with changes in elevation?

I am working on designing and creating a solar powered car for the Solar Car Challenge. The car will have to race from Dallas, TX to Minneapolis, MN in 5 days (~5 hours of driving a day) along back roads. My team is still in the planning/concept…
Sameer
  • 61
  • 3
6
votes
0 answers

Schematic Reading - Fluid Control Limit Switch Question

Does limit switch LS1 remain pressed on until the piston moves to LS2?
Anna Clarke
  • 69
  • 1
6
votes
2 answers

How can I finish a round hole so it has 90 degree corners (flat bottom)?

I have a 10 mm depth x 5 cm length 99% Tungsten rod. How can I machine the described hole so that instead of having a bevel from the tip of the main drill-hole bit, it has a perfect 90 degree corner all around as if the tip of the drill bit were…
Daniel Donnelly
  • 423
  • 3
  • 12
6
votes
1 answer

If my electronics are outdoors in a ventillated NEMA 4 enclosure, should I conformal coat my circuit boards?

I'm considering putting a circuit board in a ventilated NEMA 4 enclosure outdoors. I'm a little concerned about humidity and condensation inside the enclosure. Do I need to conformal coat my circuit boards, or take any other precautions?
Stephen Collings
  • 1,675
  • 1
  • 18
  • 27
6
votes
5 answers

Is hydrostatic pressure a dead load or a live load?

I have a structural analysis question. I want to know if the hydrostatic pressure in a water tank is a live load or a dead load and why?
Refaat Mohamed
  • 161
  • 1
  • 1
  • 4
6
votes
3 answers

How do you make a 3D print with an accurately aligned bore hole?

I am printing a wheel with a 2.5mm hole in the middle to accept a shaft of a motor with a set screw. The problem I am having is that the wheel is always wobbly when spinning (sometimes more, sometimes less without changing any parameters). Is there…
electricviolin
  • 331
  • 2
  • 10
6
votes
2 answers

Cleaning anodised aluminium

We have some metal parts in our machines, which are anodised aluminium. Those machines are due to be shipped to the customer in the near future, but I have noticed some pitting or slight rust developing on some of the anodised aluminium surfaces. I…
am304
  • 1,831
  • 13
  • 22
6
votes
2 answers

Why does the standard $k-\epsilon$ model use zero equation models?

According to Hoffman, the standard $k-\epsilon$ turbulence model incorporates a two-layer approach (inner region and outer region formulations to reperesent mixing length) when it comes to regions adjacent to wall surface $(y^+ \approx 30 - 50)$.…
Algo
  • 2,160
  • 1
  • 18
  • 33
6
votes
1 answer

Telehandler wall collision forces

The following scenario: I am tasked to design a 6.6m high reinforced concrete wall in an industrial building. We have a 10 ton Telehandler (telescopic loader) with 7m maximum reach, loading 1500kg loose material in a scoop. I need to cater for a…
SlydeRule
  • 1,226
  • 2
  • 12
  • 24
6
votes
2 answers

How to interpret this BS 5950:2000 clause for splices in compression members?

A bolted end plate splice in a strut is designed to transmit compression by direct bearing of connecting cross-sections. If, after accounting for the bending moment due to strut action and additional moment due to moment amplification effects, the…
Question Overflow
  • 824
  • 6
  • 16
6
votes
5 answers

Is there a more active passive technique for removing humidity from the air besides salt blocks?

We can get really humid days sometimes. Recently I was digging around in boxes and found some old mineral specimens, and I set out a few of the salt crystal rocks. I soon found that they had pools of water accumulating underneath them, which…
New Alexandria
  • 194
  • 1
  • 13
6
votes
2 answers

What is the Boussinesq approach?

I want to simulate a turbine in Fluent. For this reason, I studied some papers. In these papers, Turbulence is modeled using the realizable k–e model and Non-equilibrium wall functions are used in the near wall flow modeling. There are the following…
user19061
  • 899
  • 10
  • 14
6
votes
1 answer

efficiency and flow separation

I am studying about wind turbine and turbine. I have some questions, but first, I explain some cases as follow: Low velocity air over an airfoil at a zero-incidence angle does not initiate flow separation. If the air velocity slowly increases, the…
user19061
  • 899
  • 10
  • 14
6
votes
1 answer

What does a divide symbol on a drawing mean?

What does this dimension (see image), and particularly the divide symbol in it, mean please? I'm not a mechanical engineer and couldn't find the answer by searching for terms with the word "divide" in them. If it makes any difference, I guess the…
Cog77
  • 63
  • 4
1 2 3
…
99 100