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.
This paper deals with the identification of fractional models with one fractional parameter. This kind of models are capable to represent an extensive range of dynamics, including overdamped and oscillatory behaviors. The identification algorithm consists in applying an optimization function, starting from an initial point, that allows the program to calculate a very representative model of the process...
This paper presents a method for automatic test case generation for PLC software following the IEC61131-3 standard. The core component is a model checker that iteratively creates program traces, each of them covering a part of the program in terms of a coverage metric. These test cases are translated into Structured Text, a programming languages defined in the IEC61131-3, to allow the execution on...
This paper provides a discussion on the coming technological changes in process automation of networked production systems, which will change the testing procedure. In the smart factory of the future there will be no possibility to reach a test coverage of 100%, assuming a flexible automation with continuous reconfiguration and dynamic changes during runtime. Consequently, large amounts of test cases...
This paper presents the design of a scalable multi-axis control system that incorporates efficient data sharing using EtherCAT multicast over a set of homogeneous motion controllers. By associating each shared variable with a global clock-based timestamp and a dirty flag and by ensuring total order of distributed writes, the proposed system enables a cluster-architecture motion control environment...
This paper proposes a software android application to compute the absolute position of smartphones or tablets in an indoor Ultrasonic Local Positioning System (U-LPS) based on hyperbolic trilateration. U-LPS can enhance mobile devices indoor positioning allowing sub-meter accuracy results by a suitable encoding of the ultrasonic transmissions. An external hardware device based on an ultrasonic microphone...
A challenge for highly configurable products, like vehicles, is that the product system has to support all possible variants that can be configured by a customer. The production system is often highly automated with software in robots, machines and programmable logic controllers that need to be prepared to handle all possible variants. The link between the product and the assembly system can be expressed...
The requirement and benefits of off-the-shelf technologies and open standards makes the industrial automation and control systems (IACS) to move from isolated environment to interconnect with other networks. This makes the industrial control systems to expose for wide range of cyber attacks. As the severity of the cyber attacks on these networks are increasing, adopting crypto techniques and securing...
This paper presents the problem of robot deployment for a number of scattered tasks. We aim to minimize the duration it takes for all robots to reach their assigned task locations. In previous work, we have proposed a team composed of one carrier robot (CR) and several servant robots to accomplish the mission. Then we have suggested an algorithm that determines a path of the CR for an efficient deployment...
Planning in a multi-site, non-mass production environment is a special challenge because of several sources of uncertainty. Unlike in mass production facilities, in our setting the current state at all sites cannot be determined easily and exactly due to the spatial distribution of sites and the low degree of automation. For re-planning in case of failures, the possible alternative actions have to...
An multistage approach is proposed merging a deterministic and evolutionary algorithm for PI controller tuning. This technique is formulated through design of a multi-objective optimization procedure, to ensure the construction of Pareto frontier that guarantee well distribution and exclude the non-Pareto and local Pareto points. This procedure focuses on reliability-based optimization instances....
Probabilistic machine learning approaches has been successfully applied in various applications and is gaining more and more popularity. But the success of such approaches are based on the quality of the data. Getting quality data is the biggest challenge for most of the real-life applications and our application domain, i.e. industrial cleaning process, is no exception. In our application domain,...
Recent developments in Unmanned Aerial Vehicles (UAVs) have made them ideal tools for remotely monitoring agricultural fields. Complementary advancements in computer vision have enabled automated post-processing of images to generate dense 3D reconstructions in the form of point clouds. In this paper we present a monitoring pipeline that uses a readily available, low cost UAV and camera for quickly...
In the eyes of factory owners, energy management for their machines is becoming economically relevant. Most existing energy management systems use monolithic databases and low sample rates. This paper presents an approach that allows energy management on distributed modules. This yields the advantage of higher sample rates and information-based data exchange rather than transporting bulk raw data...
An automated bead layout methodology is proposed for multi-pass welding on varying seam angle. This methodology will replace the tedious process of ‘teaching and playback’ in the current line of robotic welding. To develop the proposed method, manual flux cored arc welding has been conducted on several workpieces. It is then ascertained that the bead size varies from 25 to 30 mm2 in a more ideal welding...
The term Industrie 4.0 carries the vision of smart factories, which automatically adapt to changes and assist the human as much as possible during operation and maintenance. This includes smart human machine interfaces, which reduce the chances of errors and help to make the right decisions. This paper presents an approach to equip the maintenance software running on a tablet PC with augmented reality...
This paper presents an approach that uses a supervisor architecture structure with the intention to reach flexibility of the combustion process control during the boiler functioning on the example of the high qualified GETEC Heat & Power AG. For this case, adaptive distributed 3-layer boiler control system with the supervisor on top is invented, supported on the middle layer with load distribution...
This paper describes an energy trading model for efficient energy saving and management services. The energy consumers and suppliers in smart factories can trade their energy using the proposed model. First, the market participants register their information and select the roles of the energy suppliers or the consumers. They can change the roles depending on the situation. And the energy suppliers...
The pervasive use of embedded computing systems in modern societies altogether with the industry trend towards consolidating workloads, openness and interconnectedness, have raised security, safety, and real-time concerns. Virtualization has been used as an enabler for safety and security, but research works have proven that it must be extended and improved with hardware-based security foundations...
Migration to multicore is inevitable. To harness the potential of this technology, embedded system designers need to have available operating systems (OSes) with built-in capabilities for multicore hardware. When designed to meet real-time requirements, multicore SMP (Symmetric Multiprocessing) OSes not only face the inherent problem of concurrent access to shared kernel resources, but still suffer...
Many issues in creating complex applications for pervasive environments are primarily due to the effort required to integrate perception, reasoning and actuating tasks in an efficient and homogeneous way, especially when the underlying infrastructure consists of wirelessly networked embedded devices. To mitigate the complexity of the actual implementation, satisfactory programming paradigms supporting...
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.