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Several robot-related studies have been conducted in recent years; however, studies on the autonomous travel of small mobile robots in small spaces are lacking. In this study, we investigate the development of autonomous travel for small robots that need to travel and cover the entire smooth surface, such as those employed for cleaning tables or solar panels. We consider an obstacle-available surface and target this travel on it by proposing a spiral motion method. To achieve the spiral motion, we focus on developing autonomous avoidance of obstacles, return to original path, and fall prevention when robots traverse a surface. The development of regular travel by a robot without an encoder is an important feature of this study. The traveled distance was measured using the traveling time. We achieved spiral motion by analyzing the data from multiple small sensors installed on the robot by introducing a new attitude-control method, and we ensured that the robot returned to the original spiral path autonomously after avoiding obstacles and without falling over the edge of the surface.
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http://dx.doi.org/10.3390/mi12040375 | DOI Listing |
Magn Reson Med
September 2025
Ming Hsieh Department of Electrical and Computer Engineering, Viterbi School of Engineering, University of Southern California, Los Angeles, California, USA.
Purpose: To determine the feasibility of tagged MRI at 0.55 T and tag persistence for cardiac and speech production applications. This is particularly challenging due to the short muscle T at 0.
View Article and Find Full Text PDFMagn Reson Med
September 2025
Radiology, Weill Cornell Medicine, New York, New York, USA.
Purpose: To develop a multiparametric free-breathing three-dimensional, whole-liver quantitative maps of water T, water T, fat fraction (FF) and R*.
Methods: A multi-echo 3D stack-of-spiral gradient-echo sequence with inversion recovery and T-prep magnetization preparations was implemented for multiparametric MRI. Fingerprinting and a neural network based on implicit neural representation (FINR) were developed to simultaneously reconstruct the motion deformation fields, the static images, perform water-fat separation, and generate T, T, R*, and FF maps.
J Hand Surg Am
August 2025
Department of Surgical Sciences/Orthopedics & Hand Surgery, Uppsala University Hospital, Uppsala, Sweden; Department of Orthopedics, Falu Lasarett, Falun, Sweden; Centre for Clinical Research Dalarna, Uppsala University, Falun, Sweden. Electronic address:
Purpose: Spiral or oblique fractures of the metacarpals of rays II-V are common and often managed nonsurgically. Surgery is typically recommended for fractures with displacement or rotational deformity. In a recent randomized controlled trial of displaced fractures, nonsurgical treatment with early unrestricted mobilization was found to be noninferior to surgical treatment at the 1-year follow-up.
View Article and Find Full Text PDFBiomimetics (Basel)
July 2025
School of Information and Communication Engineering, Hainan University, Haikou 570228, China.
This paper presents a bionic dual-fin underwater robot, inspired by the ocean sunfish, that achieves multiple swimming motions using only two vertically arranged fins. This work demonstrates that a mechanically simple platform can execute complex 2-D and 3-D motions through advanced control strategies, eliminating the need for auxiliary actuators. We control the two fins independently so that they can perform cooperative actions in the water, enabling the robot to perform various motions, including high-speed cruising, agile turning, controlled descents, proactive ascents, and continuous spiraling.
View Article and Find Full Text PDFSci Rep
August 2025
Agricultural Machinery Research Institute, Chongqing Academy of Agricultural Sciences, Chonqqing, 401329, China.
To analyze the metering process and regulation, and to optimize the metering parameters of the spiral outer grooved wheel seed metering device, this research simulated the seed metering using EDEM software. Following the Box-Behnken testing design principle, a regression model was established to relate all factors to the performance index. The independent variables included groove rotation speed, lead angle, and groove number, while the coefficient of variation served as the response variable.
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