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.
An efficient method was developed to compute the pressure field induced on the seafloor by a ship performing maneuvers such as acceleration, deceleration, and turning. Linear, potential flow theory with transient, finite-depth Green function is used to formulate the solution for the velocity potential. To reduce run time, thin-ship approximation is made, and the Green function is evaluated using Chebyshev...
During the launching of the AUV especially in air-launching, the water entry problem is inevitable. The AUV will stir the flow field of surrounding fluid during the moving into water, while the fluid will act a strong force on the AUV in return, which may cause trajectory deflection problems or damage to their structure and inner components in severe cases. The water entry experiment of full-size...
When people decide on preferences of personal belongings, they consider not only the appearance of the object but also the its tactile texture. The design of tactile texture is an important factor in the development of commercial products. To measure a feeling of an object, a numerical evaluation method for tactile texture is required. The measurement is performed using a large-scale apparatus, generally...
From a biological standpoint, due to the special combination of complex symptoms, some type of complex diseases is difficult to be accurately diagnosed. Known as phenotypic overlap, these sets of disease-related symptoms reveal a common pathological and physiological mechanism. Researchers attempt to visualize the phenotypic relationships between different human diseases from the perspective of machine...
Various control strategies for power regulation in variable-speed wind turbines commonly assume that the whole system parameters are known and available, which is not necessarily satisfied in practice. In this work, an adaptive control strategy, which neither need to know completely the system parameters nor the rotor acceleration, is proposed for power regulation and tracking. It also includes a...
System dynamics identification has an important role in engineering, such as for modeling and simulation of dynamic mechanisms and controller design. The accuracy of estimation certainly depends on how the input variables used for estimation are obtained and synchronized in time. In this way, the incorrect synchronization of position derived signals might become an issue. In this paper, the offline...
The multilayer perceptrons (MLPs) have been widely used in many communication applications, however, the learning process of the multilayer perceptrons often becomes very slow, which is due to the existence of the singularities in the parameter space. As the singularities significantly affect the learning dynamics of MLPs, the standard gradient descent method is not Fisher efficient. In order to overcome...
In order to accurately simulate vehicles' running states of lane changing and more effectively reflect its characteristics, based on the driving experience, this paper introduced three changing rules and their corresponding lane changing benefits and safety factors, and summarized the lateral and longitudinal motion of vehicles as the interaction result between lane changing benefits and safety factors...
A study of signal control effects on vehicle's emissions through a sequence of traffic lights was conducted. To describe the states of traffic lights, a signal state function was proposed. Meanwhile, a modified car-following model was developed and applied to show the traffic behaviors at signalized intersections on a roadway. The moving behavior of vehicle was discussed in three modes: free running...
Carry look-ahead adder (CLA) is a fast adder. This paper is delicated to accelerate the 4-bit CLA circuit. In proposed circuit structure, XOR gate is replaced by NOR gate. Moreover, logic gates have less fan-in and fan-out and signal throughs one less MOS transistor in critical path. All designs are built in dynamic CMOS logic gates. Simulation results show that the proposed architecture has advantages...
An anti-slip method for locomotives using improved adhesion characteristic curve slope method is proposed to solve the problem of low stability and control precision of the original adhesion characteristic curve slope method, it's adopting differentials of adhesion coefficient and slip speed as the identification criterion for locomotive states. The relationship among locomotive adhesion, resistance,...
Adaptive Neural Fractional Order Proportional Integral Derivative (FOPID) controller is designed to control a missile using Proportional Navigation Guidance PNG system. The proposed FOPID controller is intended to improve the performance of PNG system in terms of miss distance accuracy and stability. A new tuning procedure has been proposed by applying hybrid neural genetic algorithm in order to align...
The systems and the software in the domain of industrial trucks are becoming increasingly complex due to the rapidly increasing demand for more functionality. This leads to an even faster rising effort for manual verification activities. Therefore, automated testing techniques need to be introduced into the verification process.In this work, a search-based test generation technique has been adapted...
The paper presents an overview of various steps required for solving the problem of designing electric drives for traction applications. The design problem is solved as an optimization problem with multiple objectives subject to various constraints governed by physical characteristics and limitations of materials and specific parts used for the assembly of electric motors and power converters, international...
In this paper a novel formation control frame-work is presented for unmanned autonomous ground vehicles based on analytical mechanics and multibody interpretation. The coordinated motion is achieved by introducing holonomic constraint functions that describe the interaction between the vehicles. These functions are interpreted as constraint forces and the decentralized control law is determined for...
This paper focuses on the control system design for a wearable power assist device which provides force/torque support for people who are doing physically demanding tasks. The device is actuated by the McKibben artificial muscle. The McKibben actuator is know to exhibit high nonlinearity between the supply pressure and the contractile length, and it is basically difficult to design a high performance...
Reliability and safety are important properties in the development of complex cyber-physical systems such as autonomous vehicles. Achieving a reliable autonomous vehicle is a challenging problem, as the unpredictability of the environment demands a reliable design methodology. Additionally, current testing procedures for ADAS features on vehicles are exhausting and time-consuming, so that a better...
This paper begins with a useful presentation of known theoretical mechanics concepts for obtaining the equations of motion for systems of rigid bodies with and without non-holonomic constraints, using D'Alembert's principle. Then the equations of motion of a two-wheeled inverted pendulum on a flat surface with non-sliding wheels are obtained, by using the presented theory. Finally the nonlinear dynamical...
The reducing of energy consumption for transportation and manipulation of industrial objects is a topical issue. The objects of manipulation are gripped with the use of industrial robot and transported from one position to another. In gripping devices, the lifting force is created on the basis of the aerodynamic effect of lifting appearing due to the use of compressed air. The efficiency of functioning...
In this article, we focus on how to fuse two systems between SLAM and UAV. The main contribution is that using the UAV attitude controller provides a reliable initial value for the SLAM system, which makes the direct method of SLAM more quickly and effective converge. The UAV position controller increases the stability by receiving the exact local information from SLAM. That allows two independent...
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.