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0answers
23 views

Calculating Stiffness Matrix via Castigliano | Bending Moment Doubt

For this question I need to calculate stiffness matrix via castigliano. For that I have to know the bending moment first. Since there is no external load I have assumed load Q and bending moments are: ...
0
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0answers
30 views

Finding equilibrium positions (All)

I have tried to calculate the Kinetic and Potential energy of the given mechanism. I would be glad if somebody could have a look and confirm if it's correct. One of the equilibrium positions would ...
2
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0answers
34 views

4 Gears in a Circular Pattern - Calculating the Proper Distances for Meshing

I have recently been working on a gearbox for a robot. I have this pattern of 4 gears with each gear connected to its 2 neighbors. It looks like this: You will probably notice something though. ...
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1answer
57 views

Analytic expressions of the kinetic and potential energy [closed]

A homogeneous rigid circular disc (radius R, mass ms, center point S) rolls without a slip on a plain with a small angle of inclination alpha against the horizontal. A point mass MG is fixed on the ...
0
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1answer
16 views

Compressed Air Piping Network and Flow

In our Factory we have a Compressor which rates 660 CFM (Kirloskar Make), which is a VFD Compressor. And next to compressor, we have a Receiver tank. Next to Receiver Tank, we have a Dryer. The ...
2
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0answers
27 views

How to calculate torque requirement for vehicle with Mecanum wheels?

What are the changes specific to mecanum wheels when calculating torque requirements for a vehicle. I have the data for the vehicles mass, top speed and top acceleration.
2
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0answers
31 views

Epoxy/Adhesive to bond solid wood and acrylic

I am trying to bond solid wood with with clear acrylic, with requirement to able to withstand shearing force, not more than 6kg over an area of 100 sq.cm. Have tried to bond with result of the ...
1
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0answers
8 views

need help for designing plate rolling machine [closed]

what should be the roller diameters, if i want to design plate rolling machine which can bend at least 16 mm thickness steel plate and width of 2500 mm.if someone have calculations regarding all ...
1
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1answer
43 views

How to prevent an object doing a full rotation on a shaft

I basically need a block on a shaft to rotate between 90 degrees (vertical) and approximately 180 degrees (horizontal) counterclockwise on a shaft. I don't want the part to fall below 180 degrees. At ...
0
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1answer
44 views

How would I most easily create a mechanical intervalometer for a digital camera?

i.e. a battery powered device which presses a digital cameras capture button at some constant interval of ~60 seconds. Would it be an easy project for someone with little experience with electronics? ...
0
votes
1answer
29 views

convection query

I am attempting some convection analysis for research I am doing. I was wondering someone could kindly confirm whether I am on the right track. The calculation is based up air being passed over a flat ...
0
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1answer
17 views

Why are there rivets on the drum case of a band brake

Ive seen some images of band brakes and I notice there are usually two rivets (or screws) on the drum casing (encircled in the image below). What are the rivets riveted to? And why are they riveted? ...
0
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1answer
47 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
37 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 ...
1
vote
2answers
79 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
48 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
votes
2answers
52 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)...
0
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2answers
32 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
votes
1answer
51 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
564 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
votes
1answer
42 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 ...
0
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0answers
57 views

Correct free-body diagram for one-way clutch gear

Guys I'm designing a one way clutch gear. Can you check whether the FBD I've made is correct? I want to calculate the net upward force acting on the clutch gear (Gear B) below.
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2answers
84 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
48 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 ...
3
votes
2answers
328 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
votes
2answers
32 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
43 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
votes
2answers
69 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 ...
1
vote
2answers
136 views

Help with mechanical 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
votes
1answer
123 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 ...
1
vote
1answer
50 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 ...
-3
votes
1answer
61 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
34 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
35 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 ...
4
votes
2answers
2k 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
votes
1answer
97 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
votes
1answer
178 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 ...