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Design of Bionic Ray Robot Based on MPF Movement Patterns
Yiran Feng,Xueheng Tao,이응주 한국멀티미디어학회 2023 멀티미디어학회논문지 Vol.26 No.5
The pectoral fin fluctuation pattern is used as the object of study for the triangular-shaped skate. The skate generates waveforms through its broad pectoral fins, which are transmitted backwards to push the water backwards, and the reaction force of the water obtained is the forward thrust i.e. the MPF pattern. The fins are designed to meet the fluctuation pattern of the sinusoidal function. The prototype pectoral fin of the ray creature is analysed to establish the flutter kinematic model, the envelope coefficients are designed to decouple and simplify the kinematic equations, and a 3D mesh is drawn using MATLAB. Fluid simulation by Fluent to obtain vortex cloud diagrams verifies the feasibility of the design.
Shrimp Quality Detection Method Based on YOLOv4
Tao Xingyi,Feng Yiran,이응주,Tao Xueheng 한국멀티미디어학회 2022 멀티미디어학회논문지 Vol.25 No.7
A shrimp quality detection model using YOLOv4 deep learning algorithm is designed, which is superior in terms of network architecture, data processing and feature extraction. The shrimp images were taken and data expanded on their own, the LableImage platform was used for data annotation, and the network model was trained under the Darknet framework. Through comparison, the final performance of the model was all higher than other common target detection models, and its detection accuracy reached 93.7% with an average detection time of 47 ms, indicating that the method can effectively detect the quality of shrimp in the production process.
Hongtao Ma,Yuyang Zhao,Yiran Feng,이응주,Xue-Heng Tao 한국멀티미디어학회 2021 The journal of multimedia information system Vol.8 No.2
Under the time-varying temperature, the high-temperature radiation of forgings and the change of reflection characteristics of oxide skin on the surface of forgings lead to the difficulty of obtaining images to truly reflect the geometric characteristics of forgings. It is urgent to study the clear and reliable acquisition method of hot forging feature image under time-varying temperature to meet the requirements of visual measurement of hot geometric parameters of forgings. Based on this, this chapter first puts forward the quality evaluation method of forging feature image, which provides guarantee for the accurate evaluation of feature image quality. Furthermore, the factors that affect the image quality, such as the radiation characteristics of forgings and the photographic characteristics of cameras, are analyzed, and the imaging spectrum which can effectively suppress the radiation intensity of forgings is determined. Finally, aiming at the problem that the quality of image acquisition is difficult to guarantee due to the drastic change of radiation intensity of forgings under time-varying temperature, an image acquisition method based on minimum signal-to-noise ratio (SNR) based laser light intensity adaptation is proposed, which significantly improves the definition of feature light strips in forging images at high temperature, and finally realizes the clear acquisition of feature images of large-scale hot forging under time-varying temperature.
Gait Programming of Quadruped Bionic Robot
Mingying Li,Chengbiao Jia,이응주,Yiran Feng 한국멀티미디어학회 2021 The journal of multimedia information system Vol.8 No.2
Foot bionic robot could be supported and towed through a series of discrete footholds and be adapted to rugged terrain through attitude adjustment. The vibration isolation of the robot could decouple the fuselage from foot-end trajectories, thus, the robot walked smoothly even if in a significant terrain. The gait programming and foot end trajectory algorithm were simulated. The quadruped robot of parallel five linkages with eight degrees of freedom were tested. The kinematics model of the robot was established by setting the corresponding coordinate system. The forward and inverse kinematics of both supporting and swinging legs were analyzed, and the angle function of single leg driving joint was obtained. The trajectory planning of both supporting and swinging phases was carried out, based on the control strategy of compound cycloid foot-end trajectory planning algorithm with zero impact. The single leg was simulated in Matlab with the established kinematic model. Finally, the walking mode of the robot was studied according to bionics principles. The diagonal gait was simulated and verified through the foot-end trajectory and the kinematics.