0LAUK0 2018Q1 Group 2 - Prototype

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Introduction

This page explains the design-process behind the prototype made during this project. Suggestions for the final design are also given.

Important components that need to be kept in mind when making the prototype are:

  • Degrees of Freedom
  • Dynamic domain
  • Forces
  • Manufacturability
  • Compatibility
  • Simplicity
  • Movement
    • Kinematics
    • Arduino
    • Sensors

Degrees of Freedom

First of all the Degrees of Freedom (DOF) need to be considered. In total there are six DOF that can be included (3 linear x,y,z; 3 rotational), but each DOF makes the manufacturability of the prototype more difficult. Also, not every DOF is important to achieve the end result, which is a monitor arm that reduces neck and back complaints. Looking at the Ideal monitor guidelines, it was decided that the prototype will receive 3 DOF. The first one is a linear movement in the z-direction, to adjust to the body length of a person. The second one is a rotational movement in the xy-plane, to adjust to the angle at which the user is behind his or her desk. The final DOF is a linear radial movement perpendicular to the rotation in the xy-plane. This adjusts the distance at which the monitor is from the user. We have thought of adding a rotational movement in the yz-plane, but this did not seem necessary whereas the linear z-direction already sufficiently comprehends the height adjustment.

Mark I prototype

Dynamic Domain

As with the DOF, the dynamic domain of the prototype is depending on the Ideal monitor guidelines. Taking these guidelines in account, the ideal operational domain (seen from the top view) of the prototype is a semicylinder with a radial distance of approximately 40 cm. This can easily be accomplished by using a 2-link arm with 3 rotational joints that can fully move in the linear y-direction. To move in the linear y-direction we have decided to assume that this can be actuated by the systems that is already implemented in the Gispen TM duo desk.



Mark I prototype