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Why railroad concrete tie tips become dry first after a rain?

I've witnessed this phenomenon: Why are only the tie tips dry? Why are only the stones around the tips dry? This is a railroad in Ukraine in the morning after a rain at night. Around 80% of observed tips looked like that, slightly elevated tips…
Sashko Lykhenko
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What is a tolerable amount of elongation in steel?

I was looking at the elongation of various steel alloys, and the numbers were in the 10-20% range. Is this the amount of elongation at the point of failure? If so, what is the percentage of elongation that we would observe before reaching…
Ben Stokes
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How to minimize heat loss in an air extractor?

In an air-conditioned house equipped with an air extractor that removes for instance wet, smelly, etc. air from the bathrooms and kitchen, what are sensible cost-effective systems to prevent: Heat loss during the winter by bringing in cold air and…
Miguel
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Is active noise cancellation useful in vehicles?

The cabin noise of vehicles is a large concern in the luxury market. Why haven't any automakers used the same techniques as are employed in active noise cancelling headphones. In these devices a microphone is used as an in-loop sensor to suppress…
Chris Mueller
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Rotation around an axis outside of the mechanism

I want to design a system of linkages that will allow me to rotate the green element around the blue point/axis without entering the red circle. The green triangle to go fully around the blue point. I only need about 120 degrees. I have seen…
Allshar
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Axial deformation of variable cross-section member

I've been given a problem which I've attempted to solve, and hope some fellow engineers could possibly see if my approach is correct. We are asked to calculate a column's axial deformation due to an applied load of F = 25 kN and the force due to the…
indigoblue
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What makes a pulley that is rated for horizontal pulling different from a pulley rated for lifting?

I have a home project that involves lifting a platform with a cable that runs through a series of pulleys to redirect the cable. I'm selecting pulleys for the job and I see that some pulleys are rated for horizontal pulling while others are rated…
Klik
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Explicit Dynamic ANSYS - Origami structure

I am working on a flat-foldable conical structure and I would like to carry out some dynamic tests on it (deployment to get the displacements and accelerations...). I have designed the folded geometry of this conical structure on Soliworks. This…
Rixpuk
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Tracking location and direction without GPS?

How can I track a device's location (x,y,z coordinates) as well as the direction the device is facing (north, south, up, down, etc.)? Standard accelerometers are not precise enough for very small scale (personal hand-held devices) and tend to…
Thom Blair III
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Orthographic (engineering) drawing with same top and front view?

I came across this while reading on third angle orthographic projections. The object has the exact same front and top view - both views are trapeziums of exact shape and size (As shown in the image). Also there is a hidden circle center line right…
Gen
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Effective Throat of Flare-Bevel Weld with Reinforcing Fillet

Occasionally I have to design T-connections between rectangular tube steel (HSS) members where I have a flare-bevel weld between the corner of the tube and the connecting flat member. If the weld stress is high enough, a reinforcing fillet may be…
grfrazee
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Is there a term for a circular dependency in system design and engineering

Is there a term used in systems engineering that describes a situation in which the design of one subsystem (call it "A") affects the the requirements for another subsystem (call it "B") while at the same time the design of B affects the…
Mark
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Discontinuity in mechanism simulation: is the mechanism jammed or is my analysis wrong?

I'm designing a compact mechanism for the deployment of a mast. The idea is that the linear actuator for the deployment is on the other side of the pivot, and a slider increases the lever arm to enable the actuator to deploy the mast. I ran through…
Mister Mystère
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Worm Drive Clutching Mechanism

Problem Description I have a project where I will need to be able to engage and disengage a worm drive (actually two of them). The worm drives are quite small. The worm gear is 49.2mm in diameter and then worm screw is 12mm in diameter. I am…
Justace Clutter
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How the optical cd disc gets drawn in when we gently push it? what is the mechanism behind it?

We have seen CD drives that have slits. The CD gets drawn inside upon a gentle push. how the CD gets drawn inside upon a gentle push? How it's mechanism works?
Satya
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