{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,26]],"date-time":"2026-02-26T23:01:27Z","timestamp":1772146887059,"version":"3.50.1"},"reference-count":30,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2021,3,5]],"date-time":"2021-03-05T00:00:00Z","timestamp":1614902400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>The design and application of sensing antenna devices that mimic insect antennae or mammal whiskers is an active field of research. However, these devices still require new developments if they are to become efficient and reliable components of robotic systems. We, therefore, develop and build a prototype composed of a flexible beam, two servomotors that drive the beam and a load cell sensor that measures the forces and torques at the base of the flexible beam. This work reports new results in the area of the signal processing of these devices. These results will make it possible to estimate the point at which the flexible antenna comes into contact with an object (or obstacle) more accurately than has occurred with previous algorithms. Previous research reported that the estimation of the fundamental natural frequency of vibration of the antenna using dynamic information is not sufficient as regards determining the contact point and that the estimation of the contact point using static information provided by the forces and torques measured by the load cell sensor is not very accurate. We consequently propose an algorithm based on the fusion of the information provided by the two aforementioned strategies that enhances the separate benefits of each one. We demonstrate that the adequate combination of these two pieces of information yields an accurate estimation of the contacted point of the antenna link. This will enhance the precision of the estimation of points on the surface of the object that is being recognized by the antenna. Thorough experimentation is carried out in order to show the features of the proposed algorithm and establish its range of application.<\/jats:p>","DOI":"10.3390\/s21051808","type":"journal-article","created":{"date-parts":[[2021,3,5]],"date-time":"2021-03-05T05:03:15Z","timestamp":1614920595000},"page":"1808","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Improving the Detection of the Contact Point in Active Sensing Antennae by Processing Combined Static and Dynamic Information"],"prefix":"10.3390","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7677-1958","authenticated-orcid":false,"given":"Luis","family":"M\u00e9rida-Calvo","sequence":"first","affiliation":[{"name":"Instituto de Investigaciones Energ\u00e9ticas y Aplicaciones Industriales, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Daniel","family":"Feliu-Taleg\u00f3n","sequence":"additional","affiliation":[{"name":"Robotics, Vision and Control Group, Universidad de Sevilla, 41092 Sevilla, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3578-7910","authenticated-orcid":false,"given":"Vicente","family":"Feliu-Batlle","sequence":"additional","affiliation":[{"name":"Escuela T\u00e9cnica Superior de Ingenier\u00eda Industrial de Ciudad Real, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2021,3,5]]},"reference":[{"key":"ref_1","unstructured":"Russell, R.A. (1992, January 12\u201314). Using tactile whiskers to measure surface contours. Proceedings of the 1992 IEEE International Conference on Robotics and Automation (ICRA), Nice, France."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"50","DOI":"10.3389\/fnbeh.2014.00050","article-title":"Active touch sensing: Finger tips, whiskers, and antennae","volume":"8","author":"Grant","year":"2014","journal-title":"Front. Behav. Neurosci."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"302","DOI":"10.1007\/11553090_31","article-title":"Whisker-based texture discrimination on a mobile robot","volume":"3630","author":"Fend","year":"2005","journal-title":"Adv. Artif. Life Lect. Notes Comput. Sci."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"88","DOI":"10.1089\/soro.2016.0028","article-title":"Tactile Sensing with Whiskers of Various Shapes: Determining the Three-Dimensional Location of Object Contact Based on Mechanical Signals at the Whisker Base","volume":"4","author":"Huet","year":"2017","journal-title":"Soft Robot."},{"key":"ref_5","doi-asserted-by":"crossref","unstructured":"Salman, M., and Pearson, M. (2018, January 17\u201320). Whisker-RatSLAM Applied to 6D Object Identification and Spatial Localisation. Proceedings of the 7th International Conference Biomimetic and Biohybrid Systems, Living Machines (LM), Paris, France.","DOI":"10.1007\/978-3-319-95972-6_44"},{"key":"ref_6","doi-asserted-by":"crossref","unstructured":"Pearson, M., Fox, C., Sullivan, J., Prescott, T., Pipe, T., and Mitchinson, B. (2013, January 6\u201310). Simultaneous localization and mapping on a multi-degree of freedom biomimetic whiskered robot. Proceedings of the 2013 IEEE International Conference Robotics and Automation (ICRA), Karlsruhe, Germany.","DOI":"10.1109\/ICRA.2013.6630633"},{"key":"ref_7","doi-asserted-by":"crossref","unstructured":"Hellbach, S., Krause, A., and Durr, V. (2010, January 22\u201325). Feel like an insect: A bio-inspired tactile sensor system. Proceedings of the International Conference on Neural Information Processing, Sydney, Australia.","DOI":"10.1007\/978-3-642-17534-3_83"},{"key":"ref_8","doi-asserted-by":"crossref","unstructured":"Valdivia y Alvarado, P., Subramaniam, V., and Triantafyllou, M. (2013, January 3\u20137). Performance Analysis and Characterization of Bio-Inspired Whisker Sensors for Underwater Applications. Proceedings of the 2013 IEEE\/ RSJ International Conference Intelligent Robots and Systems (IROS), Tokyo, Japan.","DOI":"10.1109\/IROS.2013.6697220"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"1978","DOI":"10.1109\/LRA.2019.2899215","article-title":"Lightweight Whiskers for Contact, Pre-Contact, and Fluid Velocity Sensing","volume":"4","author":"Deer","year":"2019","journal-title":"Robot. Autom. Lett. IEEE"},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Nguyen, N., and Ho, V. (2021). Mechanics and Morphological Compensation Strategy for Trimmed Soft Whisker Sensor. Soft Robot.","DOI":"10.1089\/soro.2020.0056"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"278","DOI":"10.1109\/70.681246","article-title":"Active antenna for contact sensing","volume":"14","author":"Kaneko","year":"1998","journal-title":"IEEE Trans. Robot. Autom."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"124","DOI":"10.1109\/TRA.2003.820864","article-title":"Profile sensing with an actuated whisker","volume":"20","author":"Scholz","year":"2004","journal-title":"IEEE Trans. Robot. Autom."},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"De Luca, A., Albu-Schafier, A., Haddadin, S., and Hirzinger, G. (2006, January 9\u201315). Collision detection and safe reaction with the DLR-III lightweight manipulator arm. Proceedings of the 2006 IEEE\/RSJ International Conference on Intelligent Robots and Systems (IROS), Beijing, China.","DOI":"10.1109\/IROS.2006.282053"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"588","DOI":"10.1049\/ip-cta:20000524","article-title":"Force control of a single link flexible robot based on a collision detection mechanism","volume":"147","author":"Feliu","year":"2000","journal-title":"Control Theory Appl. IEEE Proc."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"773","DOI":"10.1049\/iet-cta.2008.0458","article-title":"Generalised proportional integral torque control for single link flexible manipulators","volume":"4","author":"Becedas","year":"2010","journal-title":"Control Theory Appl. IET Proc."},{"key":"ref_16","unstructured":"Malzahn, J., and Bertram, T. (2014, January 24\u201329). Collision detection and reaction for a multi-elastic link robot arm. Proceedings of the 19 World Congress of the International Federation of Automatic Control (IFAC), Cape Town, South Africa."},{"key":"ref_17","doi-asserted-by":"crossref","unstructured":"Feliu-Batlle, V., Feliu-Talegon, D., and Castillo-Berrio, C.F. (2017). Improved object detection using a robotic sensing antenna with vibration damping control. Sensors, 17.","DOI":"10.3390\/s17040852"},{"key":"ref_18","doi-asserted-by":"crossref","unstructured":"Feliu-Talegon, D., Cortez-Vega, R., and Feliu-Batlle, V. (August, January 31). Improving the contact instant detection of sensing antennae using a Super-Twisting algorithm. Proceedings of the 2020 IEEE International Conference on Robotics and Automation (ICRA), Paris, France.","DOI":"10.1109\/ICRA40945.2020.9197107"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"139","DOI":"10.1016\/j.isatra.2018.12.031","article-title":"Stable force control and contact transition of a single link flexible robot using a fractional-order controller","volume":"89","author":"Tejado","year":"2019","journal-title":"ISA Trans."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.mechatronics.2015.01.005","article-title":"Vibration-free position control for a two degrees of freedom flexible-beam sensor","volume":"27","year":"2015","journal-title":"Mechatronics"},{"key":"ref_21","doi-asserted-by":"crossref","unstructured":"Feliu-Talegon, D., and Feliu-Batlle, V. (2017). Improving the position control of a two degrees of freedom robotic sensing antenna using fractional-order controllers. Int. J. Control.","DOI":"10.1080\/00207179.2017.1281440"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"254","DOI":"10.1109\/3516.736160","article-title":"Dynamic contact sensing by flexible beam","volume":"3","author":"Ueno","year":"1998","journal-title":"IEEE\/ASME Trans. Mechatronics"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"844","DOI":"10.1109\/TRO.2006.878950","article-title":"Three-dimensional contact imaging with an actuated whisker","volume":"22","author":"Clements","year":"2006","journal-title":"IEEE Trans. Robot. Autom."},{"key":"ref_24","doi-asserted-by":"crossref","unstructured":"Nguyen, N., Ngo, T., Nguyen, D., and Ho, V. (December, January 29). Contact Distance Estimation by a Soft Active Whisker Sensor Based on Morphological Computation. Proceedings of the 2020 8th IEEE International Conference on Biomedical Robotics and Biomechatronics (BioRob), New York, NY, USA.","DOI":"10.1109\/BioRob49111.2020.9224314"},{"key":"ref_25","unstructured":"Castillo Berrio, C.F. (2016). Dise\u00f1o, modelado y Control de Antenas Sensoras Flexibles de dos Grados de Libertad. [Ph.D. Thesis, Universidad de Castilla-La Mancha]."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"1642","DOI":"10.1017\/S026357471900167X","article-title":"Adaptive Sliding Mode Impedance Control of Single-Link Flexible Manipulators interacting with the Environment at an Unknown Intermediate Point","volume":"38","author":"Fayazi","year":"2020","journal-title":"Robotica"},{"key":"ref_27","first-page":"162","article-title":"Motion Control of a Sensing Antenna with a Nonlinear Input Shaping Technique","volume":"13","year":"2016","journal-title":"RIAI-Rev. Iberoam. Autom\u00c1tica Inform. Ind."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"371","DOI":"10.1088\/0143-0807\/23\/3\/317","article-title":"Large and small deflections of a cantilever beam","volume":"23","author":"Belendez","year":"2002","journal-title":"Eur. J. Phys."},{"key":"ref_29","unstructured":"Meirovitch, L. (1967). Analytical Methods in Vibrations, Macmillan."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"680","DOI":"10.1016\/j.mechmachtheory.2010.12.007","article-title":"A nonlinear analysis of spatial compliant parallel modules: Multi-beam modules","volume":"46","author":"Hao","year":"2011","journal-title":"Mech. Mach. 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