Figure 2.1 shows an apparatus used to rehabilitate the elbow for a variety of medical conditions. The apparatus consists of a cylindrical bar with a track in which a slider can move. The bar is strapped and fixed on the patient's body while the hand is strapped on the slider. (a) Describe and sketch the apparatus as a four-bar mechanism assuming that the shoulder joint, the elbow joint, the lower and upper arms are part of the mechanism. (b) Assign reasonable lengths to the links of the mechanism you have described in part (a); calculate the velocities of the lower and upper arms when the slider is at the middle of the track and going downwards at a speed of 0.2 m/s. Cylindrical bar Straps, Slider Figure 2.1 In all your answers, state and justify your assumptions and comment on your working. 30% of the marks will be assigned for the quality of your assumptions, comments and presentation of your solutions.

Figure 2.1 shows an apparatus used to rehabilitate the elbow for a variety of medical conditions. The apparatus consists of a cylindrical bar with a track in which a slider can move. The bar is strapped and fixed on the patient's body while the hand is strapped on the slider. (a) Describe and sketch the apparatus as a four-bar mechanism assuming that the shoulder joint, the elbow joint, the lower and upper arms are part of the mechanism. (b) Assign reasonable lengths to the links of the mechanism you have described in part (a); calculate the velocities of the lower and upper arms when the slider is at the middle of the track and going downwards at a speed of 0.2 m/s. Cylindrical bar Straps, Slider Figure 2.1 In all your answers, state and justify your assumptions and comment on your working. 30% of the marks will be assigned for the quality of your assumptions, comments and presentation of your solutions.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Free Body Diagram

The system of forces acting on a body tends to either rotate it or make the body undergo motion. In general, when an external agent exerts a force on a body, the body undergoes translational motion and rotational motion. The body has six degrees of freedom under the influence of that force. Here, three degrees of freedom are from the translational motion while the other three are from the rotation motion. However, sometimes the bodies are not allowed to undergo any motion and are fixed, under such conditions the body is said to be constrained.

Question

Figure 2.1 shows an apparatus used to rehabilitate the elbow for a variety of medical conditions. The
apparatus consists of a cylindrical bar with a track in which a slider can move. The bar is strapped
and fixed on the patient's body while the hand is strapped on the slider.
(a) Describe and sketch the apparatus as a four-bar mechanism assuming that the shoulder joint, the
elbow joint, the lower and upper arms are part of the mechanism.
(b) Assign reasonable lengths to the links of the mechanism you have described in part (a); calculate
the velocities of the lower and upper arms when the slider is at the middle of the track and going
downwards at a speed of 0.2 m/s.
Cylindrical bar
Straps
Slider
Figure 2.1
In all your answers, state and justify your assumptions and comment on your working. 30% of the marks
will be assigned for the quality of your assumptions, comments and presentation of your solutions.

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