TENNIS, PADEL, HOCKEY AND ROWING
INTRODUCTION AND MOTIVATION
Racket validation with IMU using 3D cameras (task T7A)
DEVELOPED PROTOTYPE
Specific Objectives
Increase the dynamic range of the gyroscope integrated into the IMU: Not applicable.
Validation tests: Not applicable.
Study of waist and forearm acceleration during striking (80%).
No commercial chips with a greater dynamic range than 16g have been found, so it has been considered “not applicable.” Regarding the tests, trials were conducted with two inertial measurement systems placed, one on the forearm (near the wrist) and the other on the racket itself, as shown in Figure A. As expected, lower linear acceleration is recorded in the forearm due to its smaller radius of rotation, as shown in Figure B. As you can see, the inertial unit placed registers an acceleration that reaches a minimum of -16g, causing sensor saturation, which does not occur with the one placed on the forearm.
Placement of the IMUs for monitoring tennis strokes and OX acceleration recorded on the forearm (blue) and on the racket (red) during a “lifted drive” type stroke.
RESULTS AND CONCLUSIONS
In tennis, padel and hockey, the pertinent validation tests have been carried out, without obtaining satisfactory results due to not have enough dynamic range the gyro. Therefore, until we can have a gyroscope of high performance, it has not been possible to carry out the pertinent field tests. In Regarding rowing, an IMU has been placed in its central mast and tests have been carried out preliminary results showing adequate behavior for future tests, although it is necessary to improve the tightness to prevent it from being damaged when it is submerged. The layout of the table kitesurf could not be installed on the paddle because it was too bulky.
Technique recognition tests (task T7B): They could not be carried out because they were not the current benefits of the technology are sufficient, as previously mentioned.
PEOPLE AND INSTITUTIONS INVOLVED
Isidoro Ruiz-García1
Ismael Navarro-Marchal2
Juan A. Moreno-Pérez1
P. Lorenzo Uhrich3
Alberto J. Palma1
Pablo J. Gómez-López2
Miguel A. Carvajal1
1 ECsens, Department of Electronics and Computer Technology, Sport and Health University Research Institute (iMUDS-UGR), Research Centre for Information and Communications Technologies (CITIC-UGR), University of Granada, 18071 Granada, Spain.
2 SkiingLab, iMUDS, Department of Physical and sport education, Sport and Health University Research Institute (iMUDS-UGR), University of Granada, 18007 Granada, Spain.
3Kustom Skis S.L., Calle Pérez Ayuso, 9, 28002 Madrid, Spain
This work was partly supported by Consejo Superior de Deportes through projects Sensor for Sport Monitoring and Sensor Sport Lab, “Redes de Investigación en Ciencias del Deporte” years 2021 and 2022, and European Regional Development Funds (ERDF).
Thanks also to Kustom Skis for allowing the prototype ski manufacturing at their facility.
