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1500 questions
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How are thermodynamics properties of gases and liquids calculated numerically?

I was wondering how the values of thermodynamic properties as enthalpy, entropy, internal energy, specific heat, specific volumes ... etc, of gases and liquids are calculated using programming libraries such as cantera and thermopy as an…
Algo
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How to prevent vibration loosening whilst maintaining adjustability?

I have some height-adjustment nuts screwed onto vertical threads to support my print-bed for a 3D printer. They are domed nuts and the aluminium build-plate sits on top of the domes, three holes in the plate align with the domes to hold the plate in…
jhabbott
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FEM modal analysis computing displacements

I have an FEM model that I am doing a modal analysis of. I wanted to check that how I am computing the physical displacement is the correct way, as I've read a lot of about normalizing modes, participation factors, effective masses, etc. and I'm not…
engstu95
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What would be a practical way for removing thousands of padlocks from valuable bridge railings?

Inspired by this story about Paris authorities ordering removal of thousands of "love lock" padlocks from bridge railings. This is not a DIY SE question because it's not DIY scale in the first place. So suppose we have several dozen meters of…
sharptooth
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Why prefer any other pipes over plastic pipes for drainage and culverts?

Plastic pipes look superior - no corrosion, lightweight, easy to install, a bit flexible. Yet there're lots of cases when culverts and drainage pipes are made of steel (corrosive) and reinforced concrete (very heavy). What can other pipe materials…
sharptooth
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Is vortex tube reversible?

If you inject cold and hot air in outlets of a vortex tube, do you obtain a greater pressure at inlet?
user3368561
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Can all electromagnetic spectra be focused like a laser?

Lasers have a wide range of applications, but can be very costly to produce at high power/intensity. Since light is nothing more than a narrow band of the electromagnetic spectrum, it makes me wonder if the same high power/intensity applications…
Paul
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Fixing a blind bolt hole when the first 2-3 threads are ruined?

One of my suspension bolts came undone while I was mountain biking recently, sadly I didn't notice. I landed a big drop with only 2-3 threads left engaged, and unsurprisingly it's ruined them. The rest of the threads (another 20 or so) are fine. …
Codemonkey
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Why do cars have beveled tires?

If you look at a tire from the rear, you'll notice that the tire isn't quite a cylinder. It has edges that are slightly beveled. Sometimes this effect is clearly apparent, but other times, as in many car tires, it's hard to see. I can understand the…
HDE 226868
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Convergent-Divergent Nozzle Design from Exhaust Velocity

I'm working on designing a Cold Spray system that uses a convergent-divergent nozzle to achieve a 800 m/s exhaust velocity. I'm assuming 400 psi nitrogen at room temperature is provided at the inlet of the nozzle. The throat area is 0.0859 square…
sjMoquin
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What is Starting Torque?

I'm having a hard time finding an answer from the internet. What does starting torque mean?
user1791
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Snap-fit design

I'm designing 2 objects that should be attached to each other and removed when it's necessary. So I though about snap-fit as a solution. There is a lot of types of snap-fit but I'm planing to use a circular one do you know what are the parameters…
Lavender
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Dynamics of structures: combined plane stress and plane strain conditions

Problem statement For an engineering project in school, we are checking the stability in the longitudinal direction of an apartment building, taking into account the dynamic effect of earthquakes. For this, we are making a two-dimensional finite…
CJT
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How to analyze a bent beam: Stress concentration?

I am analyzing a beam, that has a bend in it. Intuitively and inspecting FEA results using a linear solver, there is a stress concentration at the bend of this I-beam. The part was not a straight I-beam that was later bent. Instead it was made with…
user33108
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I have a problem with my representation of roll in Simulink

I am currently an engineering student and a member of the aerospace club of my engineering school (ESILV) which is called LéoFly. We’re a team of 12 students and are building a Fusex (Experimental Rocket) for the launch campaign of the CNES in…
Axel JOLY
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