Feliu-Batlle Vicente, Feliu-Talegon Daniel, Castillo-Berrio Claudia Fernanda
Escuela Técnica Superior de Ingenieros Industriales, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain.
Instituto de Investigaciones Energéticas y Aplicaciones Industriales (INEI), Campus Universitario de Ciudad Real, 13071 Ciudad Real, Spain.
Sensors (Basel). 2017 Apr 13;17(4):852. doi: 10.3390/s17040852.
Some insects or mammals use antennae or whiskers to detect by the sense of touch obstacles or recognize objects in environments in which other senses like vision cannot work. Artificial flexible antennae can be used in robotics to mimic this sense of touch in these recognition tasks. We have designed and built a two-degree of freedom (2DOF) flexible antenna sensor device to perform robot navigation tasks. This device is composed of a flexible beam, two servomotors that drive the beam and a load cell sensor that detects the contact of the beam with an object. It is found that the efficiency of such a device strongly depends on the speed and accuracy achieved by the antenna positioning system. These issues are severely impaired by the vibrations that appear in the antenna during its movement. However, these antennae are usually moved without taking care of these undesired vibrations. This article proposes a new closed-loop control schema that cancels vibrations and improves the free movements of the antenna. Moreover, algorithms to estimate the 3D beam position and the instant and point of contact with an object are proposed. Experiments are reported that illustrate the efficiency of these proposed algorithms and the improvements achieved in object detection tasks using a control system that cancels beam vibrations.
一些昆虫或哺乳动物利用触角或触须通过触觉来检测障碍物,或在视觉等其他感官无法发挥作用的环境中识别物体。人造柔性触角可用于机器人技术,在这些识别任务中模拟这种触觉。我们设计并制造了一种二自由度(2DOF)柔性触角传感器装置,以执行机器人导航任务。该装置由一根柔性梁、两个驱动梁的伺服电机以及一个检测梁与物体接触的称重传感器组成。研究发现,这种装置的效率很大程度上取决于触角定位系统所达到的速度和精度。这些问题在天线移动过程中出现的振动的严重影响下受到损害。然而,这些触角在移动时通常没有考虑到这些不期望的振动。本文提出了一种新的闭环控制方案,该方案可消除振动并改善触角的自由移动。此外,还提出了估计三维梁位置以及与物体接触的瞬间和点的算法。报告了实验结果,这些实验说明了所提出算法的效率以及在使用消除梁振动的控制系统的物体检测任务中所取得的改进。