Recent content by amrbekhit

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    Graduate Modifying a transformation based on yaw-pitch-roll or phi-theta-psi

    [SIZE="2"][I've tried asking this question on math.stackexchange.com, but haven't got any responses, so I thought I'd try here] I’m building a model in a 3D simulation program (MSC Adams) and part of that model is a triangular platform which can translate and rotate in the virtual world, as...
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    Applying the Kutzbach Gruebler criterion to a pantograph

    I've attached a photo for another mechanism that is keeping me scratching my head. As far as I can tell, this is a 1DOF mechanism, with a single linear actuator allowing the fingers to rotate together about a certain point. I've highlighted in the image where I think the moving links are...
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    Applying the Kutzbach Gruebler criterion to a pantograph

    Ah that's it, thanks. That explains what the book meant when it was describing ternary and quaternary joints.
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    Applying the Kutzbach Gruebler criterion to a pantograph

    Hello all, I'm having trouble understanding how to apply the Kutzbach Gruebler equation to all but the simplest of mechanisms. As I understand it, the DOFs of a mechanism is a sum of the DOFs of all the moving links minus the sum of the all the DOFs constrained by the joints. For a planar...
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    Forces and reaction forces generated by a linear actuator

    Hi Jared, Thanks for your reply. Based on that, if the linear actuator produces a 10N force, F1 = F2 = R1 = R2 = 5N. Amr
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    Forces and reaction forces generated by a linear actuator

    A linear actuator is wedged between two solid walls as shown in the diagram below. The linear actuator is pushing outwards with a force of 10N. What are the magnitudes of the forces labelled in the diagrams? I reckon that F1 = F2 = R1 = R2. However, I'm not sure if F1 = F2 = 5N or 10N...
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    Undergrad What happens to the pressure of a liquid extracted from a pressurised container?

    Hello Turin, Thanks for your reply. What I am more interested in are the forces exerted on the capsule while it is inside the water pipe. For example, I know that if I have a suction cup attached to a wall in air, the difference in pressure between the air inside the cup and the air outside...
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    Undergrad What happens to the pressure of a liquid extracted from a pressurised container?

    Hello all, Consider the following scenario: I have a pipe entirely filled with water flowing through it due to a pump at one end pressurising the fluid. Imagine that underwater, I trap some of the flowing water in a capsule, completely filling the capsule with water, and then closing the...
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    Graduate Calculating the suction force produced by a Venturi

    Any thoughts?
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    Graduate Calculating the suction force produced by a Venturi

    Dear all, As I understand the venturi effect, if a flow of water passes through a constriction, its velocity increases and its pressure decreases at the restriction. The decrease in pressure allows a suction force to be produced. I am trying to use this principle in order to power a vacuum...
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    Calculating the minimum vacuum force for a climbing robot

    Homework Statement Hello. I am trying to calculate the minimum vacuum force required to keep a climbing robot attached to a ceiling. The robot body consists of a cuboid with two vacuum cups attached at either end. The robot will move using inchworm-style motion, attaching one of the cups...