Questions tagged [applied-mechanics]

Questions about using applied mechanics to model engineering problems.

Filter by
Sorted by
Tagged with
4
votes
3answers
2k views

What kind of spring exerts a constant force but is also adjustable?

I'm trying to make a lifting mechanism that will support variable weights, similar to this product: http://www.humanscale.com/products/product.cfm?group=quickstand On the quickstand there is a screw ...
6
votes
3answers
1k views

Mounting and Coupling an Encoder

I was wondering how to mount a small rotary encoder to a platform in order to measure how far a small treaded robot has traveled. We're using this tread/wheel set: We've tried epoxying the encoder ...
1
vote
2answers
78 views

What mechanisms can be used to move a drum at constant speed without an electrical system?

How could I design a paper spool or drum that is moving at constant speed without electrical system? What mechanisms are available? I know that some paper tracing system was being used in 19th ...
3
votes
2answers
2k views

Pneumatic cylinder force output and impact energy

I'm designing a little tester for a project which uses a pneumatic cylinder. The pneumatic cylinder's purpose is to apply an impact on a hard surface to test for deflection of the surface. When I ...
1
vote
3answers
649 views

Cantilever with three parallel rods

This is slightly similar to a question I previously asked but now I decided to simplify the question and model it similar to a design I have in mind. I sketched out a slightly simplified model. It is ...
0
votes
2answers
6k views

What is the relationship between drive shaft diameter and torque output?

I have a DC motor with a shaft with a diameter of x. It would produce some torque T because torque is proportional to radius. If I stuck a pulley on the shaft of radius 2x, then I would produce twice ...
0
votes
1answer
581 views

Converting accelerating linear motion into constant rotational motion [closed]

Suppose there is an accelerating mass along a straight line, and you would want to convert that linear motion into rotary motion. Is it possible to convert that accelerating linear motion into ...
8
votes
1answer
2k views

Dynamics Simple Pulley System - Stuck on the Process

Have spent hours poring over this homework question but am having difficulty getting the right process going to solve the problem. I don't really know where to start, and I'd really be grateful if ...
1
vote
2answers
696 views

What is micro-electromechanical systems (MEMS)?

I know definition but how would you explain to complete layik ( as me ) what is MEMS and how it is used. Examples: Silicon nanopore membranes (SNM) have been prototyped from silicon substrates by ...
2
votes
2answers
5k views

How do you find the kinematic degrees of freedom of a mechanism?

In the above mechanism it is required to find the generalized coordinates to write equation of motion of the MDOF system. I just want to ask how do we actually approach such a problem? How to identify ...
13
votes
1answer
3k views

From an engineering standpoint, what is the purpose of the indent in a coffee lid?

I've see the same lids every day but I never really thought about their construction. There is an indent in a "Solo Travel Lid" for coffee cups that is just above the hole that you drink the ...
2
votes
0answers
378 views

Impact force with unknown deformations or time duration?

I expected to find more documentation on analytical solutions to determine the contact force between bodies, where deformations ($\delta = \delta_{1} + \delta_{2}$) and impact time ($t = t_{f} - t_{i}$...
2
votes
1answer
4k views

Finding Neutral Axis of a simple shape undergoing axial load

I know that the neutral axis occurs where the sum of stresses (bending + axial) is equal to 0. I have found the stresses and drawn a diagram to represent forces. How do I determine the neutral axis?
13
votes
4answers
1k views

Easy nonlinear model for large deformation of a beam

I have a beam subject to twisting and/or bending forces as well as linear compression force along its main axis. It is modelled as an isotropic beam, but if anisotropic is not too far off then that's ...
2
votes
1answer
227 views

Block and Tackle with Ramp - stopping rope drag

I am designing a block and tackle system to haul wood up a ramp onto my porch. The issue I am having is that the rope seems like it will rub against the top of the ramp and cause it to fray. How can I ...
3
votes
2answers
299 views

Spring - Piston with different extension and compression rate

I am in need of a device that extends freely without much resistance but compresses slowly. I can provide a door closer analogy.The door should open fast but close slowly.... Do you think this can be ...
4
votes
4answers
870 views

Is it possible to design a bus that doesn't rock?

Trivially you can prevent rocking with many vehicle by eliminating the suspension. But is it possible to allow a floaty suspension that glides over potholes, without also having to rock back and forth,...
1
vote
1answer
896 views

How to build a paper ramp for a small car?

I have been assigned to build a ramp for a small car. I have only one A2 sheet of paper, scissors and a stapler. What would be the best slope profile, in order to move the car as far as possible after ...
4
votes
2answers
7k views

Increasing Yield Strength with Plastic Deformation

I'm trying to tackle a mechanics problem to be solved using a finite-element analysis, but I'm stuck on one particular bit of theory first. I've done analysis using a linear-eleastic model, and ...
5
votes
1answer
203 views

Minimising permeation rate of hydraulic fluid through hydraulic hose

I am designing an experiment where the hydraulic hose is going to be subjected to relatively high internal pressure for prolonged period of time and it is absolutely imperative that the rate of ...

1 2 3 4 5
6