Recent progress in mobile robotics paves the way of their usage in industrial environments. Nevertheless, they are currently no standards, which provide safety regulation in these environments for autonomous mobile robots. In this paper, three different safety concepts for mobile robots will be discussed, whereby the safe usage of a mobile robot in an industrial setting should be ensured. The first concept contains a safety ring, which allows the mobile robot to use probabilistic robotics in combination with a robust obstacle avoidance and safe hazard detection. Further, the second concept treats safe navigation without probabilistic robotics. The priority hereby lies on the self-localisation with reliable sensor methods. And in the third concept, an aware environment with object detection and tracking is shown. Virtual sensors in form of wireless sensor networks placed in the factory replace the need of physical sensors on mobile robots. The outline of this work is a theoretical comparison of these three safety concepts in consideration of their specific properties and their recommended usage for different scenarios.
Modern manufacturing systems are increasingly characterized by using of complex machines, tools and electronics components. Especially a proportion of electronics and software has increased steadily in recent years. Challenge of this progression is the complexity of manufacturing systems during designing, integrating and operating. Based on a product lifecycle -PL-this article introduces an integrated method for system design, which supports engineering and management of safety/security for digital manufacturing systems. This method was practically established during a planning and implementation of digital manufacturing system at the university of applied sciences "Technikum Wien". The outcomes of this methodintegrated safety and security (ISS) -ought to help the factory designers, integrators and users for (re)designing, operating and maintaining of machines, robots as far work-cells. The future work is to build simple software tool to support small and medium-sized enterprises (SMEs) for decision making during evaluation of risk assessment and management.
In modern industrial environments, the usage of autonomous mobile robots is very common. Building up the mobile robot's prerequisites not only financial resources but interdisciplinary knowhow too. Therefore, these preconditions barriers small and medium-sized companies from the up to date industrial concepts. In order, to support small and medium-sized companies this paper shows, how to design and implement mobile robot systems capable to work safety into complex industrial 4.0 environment. This research task can be accomplished in three steps. The first step deals with the conceptualization and creation of a test environment inspired by a small and medium-sized environment. The difficulty is to build a new suitable test factory, which fits in an office room. In the second step, a simple work station for different test cases were conceptualized. The third step deals with the creation of different mobile robots. Because of the limited space the mobile robots in this work were not bigger than 20x20x20cm. A concept for a test industry 4.0 test factory with simple work stations was created. Different miniature mobile robots were bought and tested, whereby different risks of the standards were researched. For the next steps, an implementation and guideline of a solution in a small-or medium-sized company will be tested and written.
This work represents the design and performance optimization of pumping aggregate for hydraulic active car suspension systems. For solving of this task is required wide scope of interdisciplinary knowledge. The software used in this project was SolidWorks from Dassault Systemes. Using this tool is possible to analyse and optimize the flow of hydraulic fluid throw the electromotor of pumping aggregate. This papers shows among other, how to set the input parameters and constraints such as pressure and velocity, how to simulate a rotating flow of cooling fluid inside intermediate regions between stator and rotor. For approving a required lifetime of pumping aggregate a fatigue analysis was done and represented above. The verification of simulation model and mandatory validation of simulation results are made. The conclusions at the end of this work have confirmed the usage of computational fluid dynamic -software for future researches of pumping aggregates.
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