Questions tagged [applied-mechanics]

Questions about using applied mechanics to model engineering problems.

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306 views

Find the load applied to each wheel by the anti-roll bar

Wikipedia says that an anti-roll bar is a device that balances the weight of car between the wheels, preventing it from rolling. I want to simulate this in a game, but I don't know the equations ...
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1answer
986 views

Bearing Alignment Moment Reactions

I'm trying to analyze a simple shaft supported by two bearings and subject to a single point load. But I keep coming across assumptions that only consider the vertical reactions and neglect the moment ...
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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 ...
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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 ...
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2answers
10k views

Calculating torque needed to climb a graded hill

I've been designing an electric skateboard which is driven by only one of the rear wheels (for the moment). As I was picking out motors for the board, I soon realized I would need to find a balance ...
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1answer
584 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 ...
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3answers
667 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 ...
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2answers
532 views

Deflection of parallel rods with force at an angle

As in the picture below, there is a static force $A$ being applied at 45 degrees to a rigid rod attached to a rigid plate. The plate is supported by two rods of length $B$ and diameter $D$, each of ...
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2answers
4k views

Why do we neglect the radial stress in case of a thin pressure vessel?

A cylindrical or a spherical pressure vessel, having inner diameter $d$ & thickness of wall $t$, is called thin if $\large \frac{t}{d}<\frac{1}{20}$. $\bullet$ Thin cylindrical pressure ...
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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 ...
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2answers
6k 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 ...
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3answers
1k views

Compound gear system ratio

This might be a stupid question, but I'm new to mechanics, so please bear with me. Suppose I have a compound gearing system defined in the image below (not to scale). The green gear is the driving ...
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1answer
4k 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 ...
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1answer
2k views

Calculate effort to raise hinged lever with distributed load

My father-in-law would like to install a hinged stair system in his garage that allows him comfortable access to his attic space. He wants the stairs to swing up flush with the ceiling when not in ...
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1answer
564 views

How to transfer rotational energy into lateral energy only when rotating one way?

Is there a general way to convert rotational energy from a gear or something into lateral motion toward or away from the gear? I could use a piston type construction, but I only want the lateral ...
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2answers
704 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 ...
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0answers
408 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 ($t = t_{f} - t_{i}$...
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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?
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2answers
68 views

Optimizing support board placement on work table wing

I'm currently building a work table that will have "wings" on each side that are fixed to the mid section of the table via a hinge. These wings, in turn, have hinges that fix a support board to them ...
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1answer
237 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 ...
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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 ...
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2answers
10k views

How to simulate the contact between two distant parts in Ansys workbench?

I made a test in Ansys but the result doesn't seem to be the final steady state. The two bodies didn't touch each other. How can I get the right result?
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1answer
405 views

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 ...
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2answers
308 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 ...
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2answers
19k views

How can I calculate the force required to bend a 10 mm thick plate in a rolling machine?

We have a rolling machine with 3 rollers; the bottom has two rollers with diameters of 168 mm and one top roller with a diameter of 219 mm. I want to calculate the required force to bend a 10 mm ...
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4answers
871 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,...
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1answer
909 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 ...
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1answer
2k views

How to rate a davit beam?

What forces are relevant when it comes to a davit lifting arm with a support? I'm not sure how to take the weight of the davit into account or how to calculate the max stress/strain on the system. ...
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1answer
209 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 ...
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2answers
5k views

Why are tremors of an earthquake felt more on upper floors?

Why are tremors of an earthquake felt most on the upper floors of a building in comparison to lower floors? Does this have something to do with a third class lever?
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2answers
2k views

How to draw the velocity and acceleration diagrams if there is no connecting rod between the pins?

From the previous examples I've seen, there is a connection rod, for example, between a and c and then another rod from c to one of the pins. However, in this case, the rod ac is directly connected to ...
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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 ...
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5answers
3k views

Practical setup to measure angular velocity

I have got a spinning top from a Canadian manufacturer, and I am deeply amazed by how neatly it spins. My interest in physics has led me to try to find out at what top speed I can spin the top and ...
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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 ...
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2answers
8k views

Finding the pull-through capacity of a nutted bolt and washer in ASA plastic

I have a uniform load applied to the underside of a plastic sheet which is to be resisted by the combination of a bolt, washer, and nut as depicted below (the other end of the bolt is secured and will ...
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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 ...
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2answers
557 views

Final speed of a truck on a slope?

I have a truck which weighs 190 kg and will travel 100m down a 38° slope. How I can find the trucks speed at the end of the 100m?
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5answers
7k views

How can I improve traction on a wheeled vehicle yet reduce friction?

This is inspired by a project I undertook for my Physics class last year; I'd like to apply it in the future. Background: For the project, I and a few classmates were required to build a small car ...
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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 ...

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