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Safety Instrumented Systems (SIS) are usually designed to prevent accidents, avoid undesirable situations and guarantee continuous operation of oil and gas production systems. An interruption in the operation can be caused by faults in sensors and/or actuators. Hence, SIS are usu ally integrated to the supervisory control system in order to use the information from sensors to prevent such unde sirable...
The development process of complex systems needs to take in account differents domains and aspects. SysML (Systems Modeling Language) is a new modeling lan guage that allows a system description with various inte grated diagrams (as structure, behavior and requirements diagrams), but SysML lacks formality for the requirement verification. The aim of this paper is to propose an ap proach to verify...
In case of failures in a PLC controlled process the problem of diagnosis arises. Today this is often a manual task. Whenever the failure in the controlled system is not directly related to an actuator, its sources have to be tracked back through the PLC program to the corresponding sensors. This process can be very time consuming. The presented work aims at providing a means for determining this effort...
In order to meet the various challenges in the automotive industry, new and integrated methodologies for production planning and ramp-up processes are required. Thus, a concept for automated PLC software generation based on standardized digital process information is introduced with the special focus on the needs of the body shop in the automotive industry. The foundation for PLC software generation...
Currently many companies that deliver automation equipment intend to grade up their products by providing enhanced e-services like remote maintenance, remote diagnosis or remote consulting. Software agents are an adequate approach to realize these tasks, however, available agent frameworks lack satisfactory support for this domain. In this paper we present the specific requirements for agents in industrial...
Today, the engineering of complex automated systems is usually carried out with the help of CAE (computer-aided engineering) software tools with an integrated data basis to store and retrieve planning data throughout the planning and implementation process. This data forms the basis for the automation of engineering tasks, i.e. repetitive parts of the engineering work can be carried out automatically...
Manufacturing Execution Systems as they are outlined by the IEC 62264 standard provide a variety of functions in the manufacturing domain, including the management of maintenance operations. For these operations access to equipment information is important. However, a suitable information model is still missing. In regard to the life-cycle of equipment, this paper motivates the generation of an equipment...
COCOS (COordinated COmmunicating Sensors)1 is a lean middleware platform for wireless sensor networks. The major programming abstractions of COCOS are distributed sensor spaces. All objects in such a space can be collectively addressed. This way, high-level data-parallel programming concepts such as global reductions are possible. This paper introduces the spaces of COCOS and describes their usage.
On-line motion estimation of a single camera moving freely through an environment is an interesting and challenging problem with a wide rage of applications. This estimate position from measurements of self-mapped natural visual features represents perhaps the more difficult class of the (SLAM) simultaneous localization and mapping problem. In this paper we show an approach for delayed features initialization...
In this study, scheduling method using a combination of auction-type real-time scheduling and simulation is proposed in order to automate the scheduling for machining job shop. The control mechanism which is essential for executing real-time scheduling and simulation simultaneously has been developed and implemented. The auction algorithm for the real-time scheduling which improves the delay of delivery...
Mobile robotics is a challenging research area, with produced results that were unthinkable several years ago. There exist algorithms and methods capable of performing difficult tasks such as detect/classify objects, skill learning and SLAM. From the initial design steps, the real-time software architecture of a robotic platform requires great attention. The problem is difficult, because various components,...
This paper presents an approach to trajectory generation for unmanned aerial vehicles (UAV) by using mixed integer linear programming (MILP) and a modification of the A* algorithm to optimize paths in dynamic environments, particularly having pop-ups with a known future probability of appearance. Each pop-up leads to one or several possible evasion maneuvers, characterized with a set of values used...
This paper presents an outdoor guidepath navigation system for autonomous mobile robots (AMR) that use permanent magnetic markers embedded in the ground. The odometric data provided by the wheel encoders is fused with the data from magnetic markers. The extended Kalman filter (EKF) was chosen for the fusion process. The AMR is equipped with a magnetic sensing ruler (MSR) developed at ISR-UC that is...
Robots are becoming commonplace in unstructured and dynamic environments, ranging from homes to offices, public sites, catastrophe sites, military scenarios. Achieving adequate performance in such circumstances requires complex control architectures, mixing adequately deliberative and reactive capabilities. This mixing needs to be properly addressed from both the software and hardware architectures...
This paper is aimed to discuss the abilities of the ontologies to describe a human like structure of knowledge and propose some visions on how the ontologies can be developed in accordance to the lessons from the cognitive psychology. The needs of intelligent industrial environment require the solution for replacement of technical expertise of engineers. The ontological approach is claimed to be a...
The ever increasing use of networked field devices in manufacturing environments brings about new challenges for diagnosis and supervision of these devices. Manufacturing has become more multi- vendor, multiple fieldbus orientated and consequently diagnosis of a variety of geographically wide spread fieldbuses has become a necessity. The research work proposes the development of a single diagnostics...
This paper is focused on presenting the means of modeling the conditions that are tested with either conditional or looping control constructs (repeat-while, repeat-until and if-then-else). The depicted ideas are part of a methodology developed to formally verify and validate the orchestration of factory automation web services. The formalism used to represent in a modular manner the sequencing of...
Today the manufacturing of piezomotors consists of various heterogeneous, evolving and it-isolated production processes. The main task of the middleware is to provide a simple, flexible and extendable method for the integration of all existing and future processes to a centralized information system. Then with this system it is possible to present filtered information for special applications like...
The Manufacturing Messaging Specification MMS, standardized as ISO/IEC 9506 nearly 20 years old, but still in use, always lacked a convenient application interface. The semantics of MMS of the main services of MMS are nearly identical to those of OPC, so it is only natural to use OPC as an application interface. At the same time, such a construct gives OPC access to remote devices in a quite efficient...
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