The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The traditional metal plate bending process is difficult to meet the requirements of modern shipbuilding industry, and this paper adopts a new incremental bending process for manufacturing metal plate based on minimum energy principle and dieless forming. This process uses a set of punches and a series of highly adjustable and head rotatable supports to complete the punching process by changing the...
A method of adaptive backstepping sliding mode controller design is presented for dynamic positioning ship with nonlinear mathematical model and external uncertain disturbances. Firstly, the position deviation and velocity error are proposed, and the virtual control vector of two subsystems are defined. Secondly, the sliding mode surface switch function is designed. Then, adaptive controller is designed...
This paper proposes an insulator defect detection algorithm based on computer vision for helicopter aerial insulator imaging in complex backgrounds. The algorithm runs fast with high detection accuracy, which meets the requirements for detecting missing insulators. However, because the background of the insulator image acquired by aerial photography is complicated and there is more than one insulator...
The adaption of inertia weight in particle swarm optimization (PSO) is important manner for balance the capabilities of exploration and exploitation. According to the concept, we had completed the test for two chaotic maps called logistic map and tent map to opportunely give the adaption for the inertia weight of a PSO. Six test functions with 10 dimensions are used to evaluate their efficiency. By...
Based on the spectral data from SDSS, Kernel Support Vector Machines (K-SVM) is applied to classify quasars from other celestial body. Firstly, the basic theory of the SVM(Support Vector Machine) with relaxation factor and kernel function is introduced. Then, the main parameters are designed and selected. Finally, the method is applied to the classification and identification of the quasars. The classification...
The paper proposed a robust optimum thresholding method based on local intensity mapping(LIM), class uncertainty and region stability theories to segment fuzzy and noisy images. First of all, the intensities of an image would be mapped into another intensity space by LIM which could decrease the influence of noise and uneven intensity distribution. Then, the intensity-based class uncertainty is applied...
Surface polishing is a crucial final process of many manufactured parts. Presently, the process is heavily dependent on the skill of the trained workers and hence, is time consuming, expensive, error-prone and environmentally unfriendly. This paper presents a force controlled flexible robot polishing system utilizing a specially designed active end effector with a multi-step path planning. The main...
To quickly and efficiently analyze a large-scale environment by the camera with limited field-of-view, intelligent systems should sequentially select the optimal field-of-view to observe important and informative parts of area. Especially in the image retrieval tasks, small observations could be sequentially selected to improve the performance of image retrieval with less computational costs than...
The security of internet of things (IoT) device is very important. These IoT devices have constraints include area, power, and processing time. Therefore, lightweight ciphers, which can be utilized by low area, low power, and low latency, have been attracted attention. Midori is one of the most popular lightweight ciphers and it is designed oriented low power. Regarding hardware security, the risk...
In the fault diagnosis method of the resonance demodulation of the planetary gear of the wind turbine, there are some shortcomings like artificial difficulties in demodulation band and low demodulation spectral resolution. In this paper, wavelet packet decomposition and reconstruction method are used effectively to extract the resonance frequency components caused by the local fault of gear, which...
The formation control problem of a multi-agent system with target tracking and navigation is resolved by a gradient based extremum seeking control (ESC) associated with artificial potential functions methodology in this paper. It aims to maintain and achieve a stable formation for a swarm of multi-agent system, while guaranteeing tracking of a specified trajectory. By incorporation of artificial potential...
This paper describes a method of grasp point detection from an item of cloth with unarranged shape. We focus on the combination of grasp point detector with shape classifier. In the proposed method, Convolutional Neural Network(CNN) is generated for shape classification, and it is also used for extracting a feature vector that presents shape characteristics. Using the feature, grasp points are calculated...
In light of starting clutch control requirement in unmanned modified process of a helicopter, the control system with high-reliability circuit, excellent engagement quality and engine speed stability are researched. By analysing the disadvantantages of the original clutch control system, the improved design requirements are proposed. To achieve the requirements, half bridge chips are used in the control...
This paper presents the gait design and comparison study of a quadruped robot. The main contributions of this paper are: (i) Explore the modularized system design of an 8 degree-of-freedom quadruped robot with a power management system. (ii) Propose a gait design method based on drive function. (iii) Propose another gait design method based on foot trajectory. (iv) The simulation of the walk and trot...
In this paper, we propose an efficient terrain meshing method based on discrete point cloud, which is based on the existing meshing method of 3D reconstruction. Our meshing method uses the DTM (Delaunay Triangle Mesh) as a criterion to establish vertex constraints and evaluation functions. We start from a seed triangle and use the growing method to extend the outer-edge of each triangle until all...
This paper aims at realizing high precision control of a 3 degrees of freedom (DOFs) exoskeleton robot for space teleoperation, using virtual decomposition control (VDC), while strictly ensuring global stability. Based on the VDC approach, firstly, the entire system is virtually decomposed into several subsystems. Secondly, kinematics and dynamics of each subsystem are analyzed and the control equations...
With the development of social economy, increasing importance has been attached to people's health consciousness. Exercise is widely regarded as the first step for health maintenance. For reducing accidents like syncope and dehydration in exercise, researchers and consumers urgently need a user-friendly and reliable tool to assisted analysis the risks in exercise. Aiming at the prediction on the changes...
The cycloid drive usually has a cycloidal wheel meshing with pins to achieve transmission. The profile of the cycloidal wheel is generally a curve derived from an epitrochoid. This paper presents two design types of cycloid drive, the cycloidal wheel profile of one is internal offset of epicycloid and the other is external offset of hypocycloid. Parametric 3-D models of the two design types are constructed...
Manifold causes of image blurring make the no-reference evaluation of realistic blurred images very challenging. Previous studies indicate that handcrafted features suffer from poor representation of the intrinsic characteristics of image blurring and thus blind image sharpness assessment (BISA) is unsatisfactory. This paper explores a shallow convolutional neural network (CNN) to address this problem...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.