Етикет: автоматика

Key Words: Mobile robot; automatic control; computer vision; machine vision; Arduino; Pixy; line tracking.

Abstract. This paper presents ways to control a mobile robot system for two different tasks: line tracking; and finding and passing through an opening in a vertical plane. The system is constructed of a threewheel platform, Arduino microcontroller and a smart camera Pixy2 for machine vision. For the line tracking task, based on the x and y coordinates at both ends of the visible line, measured by the camera, vector gradient is calculated and weight factors are adaptively determined for generating a two-component error fed to a PID controller. The feedback control successfully drives the robot over the line even in the presence of sharp turns. For the hole-passing task, the robot locates a color-illuminated opening in a vertical plane, moves frontally and passes through it. The system finds the frontal position by repeatedly measuring the opening width while maneuvering straight and diagonally towards it. Both tasks are successfully implemented despite the variable ambient lightning conditions.

Повече

Key Words: Cask Ale Brewery; control; automation; Siemens control system.

Abstract. This article is about an automated Cask Ale Brewery Control System. Technical solution of controlling whole plant using Siemens S7-400, The standards and good automation practices of Briggs of Burton are applied. The document also defines how the control system will be structured to meet the User Requirements.

Повече

Key Words: Robust control; cross-flow water turbine; H∞-norm; system uncertainty; load disturbance.

Abstract.  A mathematical model describing the operation of the cross-flow water turbine has been developed in this paper. A robust governor has been synthesized using H∞ techniques to replace the conventional governor of the water turbine . The transient processes in the system are compared to the processes where the classical PID controller is used. The simulations are carried out using MATLAB and the results show that the overall system output performance can be improved using the proposed H∞ robust governor.

Повече

Key Words: Aperiodic unit; time constant; transmission coefficient; parallel correction.

Abstract. A method for full operational identification of objects or units approximated to an aperiodic unit of the first order where electromagnetic inertia or time-delay are negligible. These are low-power electromechanical systems and small chamber furnaces. The method identifies the time constant T and the transmit coefficient k on the object. Robust control of a first-inertia object is developed – a small electric furnace with forced cooling, for which a predetermined transition process of cooling the material has to be provided. The corresponding parallel correction scheme is implemented, which turns the object into a deinterleaving tracking system.

Повече

Кey Words: Dispatching system; GPS; navigation; transport vehicles.

Abstract. A GPS dispatching system for monitoring and managing of transport vehicles has been developed. It is reliable, easy to use, offers a wide range of features that can be used to optimize financial costs. It increases the productivity and efficiency of work, reduces fuel costs and eliminates abuses. It is available in different variants depending on the investments available. Varied modules can be added and security, navigation and driver monitoring can be ensured.

Повече

Key Words: DC motor; solar tracking system; Arduino; photoresistor.

Abstract. This article presents the development of a two-axis platform for laboratory-based solar tracking system. The platform has the ability to rotate on the horizontal and vertical surfaces by two direct current motor. The use of an open source Arduino microcontroller makes it convenient to experiment with a variety of platform control algorithms and maximize performance. Its compact size makes it mobile to experiment with in different work environments. An algorithm is used to monitor the illumination of four photo resistors located on a cross.

Повече

Key Words: Statistical analysis of data; linear and rank correlation; analysis of variance.

Abstract. Good laboratory practice requires laboratories to ensure the quality of analyzes and assess the extent of human exposure to different chemicals and reagents. The subject of research and analysis are data from measurement of samples between two laboratories, by two different methods, in the processing of ore in the Ellatzite-Med AD Mine Complex. Of particular importance is the reliable measurement of the products (concentrations) from the flotation process (content of copper in the ore, intermediate products, concentrate and waste) as well as the production of molybdenum (feed, concentrate and waste). As a result of the sampling and depending on the characteristic to be determined and the test method, the concentration of the identifiable element is measured differently and with different technical means. The statistical analysis of data of parallel measurements from two or three laboratories involves calculating a linear or rank correlation and analyzing how significant the influence of a laboratory factor is, as well as studying and modeling the relationship between the presence of chemical elements in the ore, waste and concentrate in the process of laboratory control.

Повече

Key Words: Gas sensors; gas sensors array; electronic nose; food; quality control; sunflower oil.

Abstract. Тhis work presents a study and identification of oil through multisensor system electronic nose. The system is built on the basis of eight gas sensors, reacting to different types of gas. With the help of the system, a study of sunflower oil produced from pressed sunflower seed and extrusion of oil cake (the remainder of the primary pressing) was carried out. The data obtained from the study is used to train an artificial neural network. After the training, artificial neural network successfully recognizes the test sample.

Повече