University of Twente Student Theses


Solutions for positioning inertia measurements units for motion tracking

Helling, G.A. (2012) Solutions for positioning inertia measurements units for motion tracking.

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Abstract:Inertial motion capturing is one of a few techniques for real-time analysis of human motion. The main advantage of this specific technique is that no expensive lab and cameras are needed to get the job done. Xsens Technologies has been developing this technique for over 10 years. Their system (MVN) can be used in a number of different settings. For entertainment purposes they have developed a full-body lycra suit. For motion science purposes they have developed seperate straps that can be put onto each individual segment. This helps increase accuracy of the measurements because they can be put more tightly onto the body. It is also a one-size-fits-all solution which makes it a cheaper and easier product because only one size is needed at all times, unlike the suit. This seems like a perfect solution but there is always room for improvement, this is especially true for measurements of the shoulder. Currently the MVN Straps include some sort of shoulder top that has the shoulder sensors and sternum sensor attached to it. But because of the soft tissue artifact, complexity of the shoulder and complexity of the shoulder top, the measurements are not very accurate. The goal of this project is to find a new solution for this problem. Chapter 1 will go into more detail about this. Chapter 2 is about the analysis phase of this project. It shows how and by who the straps are being used, how the shoulder works, what the current solutions is and what competitors have come up with. This chapter is very important to help understand the problem and what needs to be taken into account when designing a new shoulder strap. Chapter 3 shows the design phase. To rule out some ideas, some of the old concepts and prototypes have been analyzed. These ideas did not work or were too complicated so anything similar to any of those probably would not work either. With that in mind some ideas were generated and the ones that seemed the most promising were worked out in more detail. Eventually four concepts were created. Two of them involving neoprene shoulder braces and two of them made from lycra. In chapter 4 these concepts were eleborated into prototypes. Unfortunately it turned out that one of them was too complicated to make in the limited time that was left so only three prototypes were created. The chapter also explains and shows the results of an experiment that was conducted with the prototypes to see if any of them worked as expected and if any of them would be good enough to replace the current shoulder piece. Unfortunately the results show quite some inconsistency which made it very difficult to draw some proper conclusions from them. Results show that the neoprene prototypes do not perform very well even though people found them to be the most comfortable. Perhaps with a few adjustments it is still possible for one of the two neoprene ideas to perform better.
Item Type:Essay (Bachelor)
Faculty:ET: Engineering Technology
Subject:20 art studies
Programme:Industrial Design BSc (56955)
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