Questions tagged [mechanical]

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3answers
269 views

How much force/torque act on a wheel of a vehicle when vehicle moves a constant speed and suddenly got a bump or jerk?

I am working on disturbance rejection technique in a vehicle of a wheel. Suppose our vehicle moves with a constant speed 15 km/h. Since roads are uneven in nature, suddenly vehicle got a bump or jerk. ...
0
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1answer
220 views

Why does the fulcrum pin of a band brake experience “double” shear stress [closed]

My machine design textbook states that the fulcrum pin of a band brake during braking is subjected to a double shear. How do you say it is subjected to a double shear and not to a single one. By ...
2
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2answers
164 views

How does a two dimensional elevator work?

If you watch this video, you can get a sense of how an elevator can operate in two dimensions. But, what I can't figure out is how it is driven. If you consider a conventional elevator, there is a ...
2
votes
1answer
50 views

Hinge or similar that breaks at a certain change in acceleration?

Suppose I have a rope that is capable of lifting 100 Kg without breaking. But I would like the rope to break if it is exposed to a sudden change in acceleration (jerk). So if the rope was lifting 10 ...
0
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3answers
119 views

timing pulleys setup for children's pedal car

I want to convert my son's pedal car to electric. The car is meant for 3-6 year old children. So far I got the following: 50W, 3300 RPM electric motor with 8mm round shaft (no keyway or shaft groove)...
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2answers
46 views

What mechanical design will shake a gravel screen box back and forth not up and down

Looked at this gravel screen and its a different design wondering how the shaker box moves sideways directly connected to the small gas engine, How or what mechanical connection would be involved? ...
2
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1answer
204 views

Vehicle Train Towing [closed]

Why can I not tow 50,000 lbs (40,000 cargo and 10,000 Trailer bed) using multiple pickup truck each individually capable of towing 30,000 lbs? I was told that the towing capacity does not "Add up" ...
8
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3answers
3k views

Mechanical advantage of the 3-ring release system

I'm quite curious about the 3-ring release system used in parachutes, as described in this Wikipedia article: https://en.wikipedia.org/wiki/3-ring_release_system I wonder why is this system so ...
3
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1answer
47 views

Scanning and modeling my personal vehicle for aerodynamic simulation

I have this pickup truck that I love dearly. I often change the aerodynamic configuration of the truck when I use my camper shell, or roof top tent, etc. Is there a reasonably easy way to create a ...
1
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2answers
107 views

Which frame is optimal for children's bicycle trailers? tubular or rectangular frame and why? [closed]

I need to construct a 3D wooden bicycle trailer for Kids. The weight of bicycle trailers must also be light! The Frame should be made of wood. what criteria should I use to construct a Frame,Children'...
0
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1answer
104 views

Z-axis auto adjusting fixture device

I am looking for a mechanism that would allow me to support a fixture attached to a 3-axis motorized stage. I have attached a picture of my current design. I trying to design/incorporate some sort of ...
2
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2answers
949 views

How to calculate the gear ratio of planetary gear?

I saw this picture today: They give an ratio of 5/352. I think this is not possible with a simple gear. Maybe the upper sides ratio is the cause for it. Which formula do I need to calculate the ...
0
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2answers
100 views

How to make a clamp for this motor to move it in two directions?

I'm working on a disc brake balancing machine, as shown below this is a belt pulley drive and for alignment purposes I want motor to be able to move vertically as well as inwards outwards (to tighten ...
1
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2answers
118 views

Temperature dependent electricity consumption of HVAC System

I am trying to figure out if there is a decrease in electricity consumption of a cooling unit if the ambient temperature decreases from 35°C to 20°C. More detailed, a company is planning to install an ...
-1
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2answers
103 views

Collecting Rainwater off a Domestic Roof for Flushing Toilets [closed]

I am working on a project for an Environmental Engineering class. Our concept is a system that collects rain water for use in toilet flushing, i.e. requires minimal filtration. I have no experience in ...
2
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2answers
268 views

Explain tolerances in technical drawing

I'm not a mechanical engineer and am not used to looking at mechanical drawings. I'm trying to understand what these tolerance features mean. There is a positional tolerance feature, which ...
0
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1answer
329 views

How to derive deformation gradient or displacement gradient?

In one of my project, I need deformation gradient or displacement gradient for some elements in my model that made by ABAQUS software and I can't find it directly, any suggestion or help would be ...
2
votes
1answer
120 views

How did the snifting valve in Newcomen's steam engine work?

Its function was to expel the air that came inside the cylinder along with the steam to prevent the engine to become "wind logged". Since the valve was non-return, how did Newcomen stopped steam from ...
-2
votes
1answer
72 views

Is there something that can expand to 12 times it's size on the x & y axis (not concerned about the z), and can still return to it's original shape?

I posted this over on physics, they suggested I cross-post it here. I've been looking for a solid square (non-pourus) that can expand to 12x it's size and back again. This needs to grow and shrink on ...
1
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1answer
53 views

Mechanical Engineering- Modeling contact in Abaqus

I have simulated a 2D model in Abaqus which indicates 2 main part, first a sector that represent as wheel and, second a rectangular that represent rail. the wheel and rail are in contact and wheel ...
1
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1answer
38 views

Planetary gearing

It is said when a planet gear revolves around a fixed sun wheel, the number of revolution it makes might be more than what appears to be logical. For example, if the planet and sun are fitted with 20 ...
3
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2answers
7k views

What is Saint Venant Principle?

I am having problem with the application of Saint Venant principle.I have heard that quite often we use that knowingly or unknowingly.I would be very greatful to anyone who would explain this very ...
0
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1answer
319 views

Mohr's Circle explanation in detail in simple languagr [closed]

Someone please explain me Mohr's circle in detail in a simple language
0
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1answer
620 views

Force limits for gear rack and pinion gear

I am accessing the feasibility of using a gear rack and pinion gear to move a moderately heavy object. I have never used gear track for a larger project so I don't have an intuitive basis for judging ...

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