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  • Author: Daynier Rolando Delgado Sobrino x
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Using Virtual Reality as a Support Tool for the Offline Robot Programming

Abstract

The present article focuses on the possibilities of using Virtual Reality (VR) as a supporting tool by using the offline programming method for industrial robots. The philosophy of using such a process is hierarchically linked to the observance of methodological procedures for the proposal new workstations with using industrial robots. First, it is necessary to develop CAD models of the projected workplace, which can be imported into a suitable simulation environment for the creation of robotic simulations with support for visualization to the immersive VR environment. In our case, the CAD software Catia was used to develop a workstation, followed by integration of the CAD database into the simulation environment of Process Simulate (PS). Support for the visualization in the immersive environment of the Virtual Reality of Process Simulate was vested using the glasses headset HTC VIVE.

Open access
Analysis of the Surface Morphology of the S235JRG1 Steel After an Abrasive Water Jet Cutting Process

Abstract

The present paper discusses the impact of the speed of an abrasive water jet cutting process on some surface properties and morphology of the S235JRG1 steel. The values of the cutting speeds used for the analysis were of 100, 150 and 200 mm.min−1 respectively. A contact profile method was used to analyze the surface roughness during the conducted tests. In this study, the observed surface roughness parameters were the Ra, Rt and Rz, respectively. At the same time, these parameters were measured in three positions, i.e.: at the inlet (A), in the middle (B) and at the exit position (C) of the water jet nozzle with respect to the machined material. The experimental study showed that the roughness of the surface reached higher peaks and was more pronounced at the exit position (C) of the water jet. Similarly, it was also concluded that a better quality of the surface was achieved at a speed of 150 mm.min−1.

Open access
Risks Resulting from Reverse of Modification of Expansion Weapons

Abstract

In general, the probability of an undesirable event occurring and its consequence is the gist of the risk characteristics. Thus, risk is part of all the activities that a person performs. The use of weapons and possession of weapons is a great risk. It makes difference who owns them, where they are used and under what circumstances. At present, the great risk is also associated with the possession and use of expansion weapons, also called acoustic weapons. This issue is still very sensitive; the aim of this article is to highlight the risks of reverse modification of such weapons. Publication of this contribution does not support or otherwise supports the use and sale of any type of weapons.

Open access
Virtual Commissioning of a Robotic Cell Prior to its Implementation Into a Real Flexible Production System.
Generation of the Robot Offline Programming (OLP) and Validation of the PLC Code.

Abstract

With the rise of the Industry 4.0 and the digitization increase in the field of design of the automated devices and systems, raises the requirements to digitize all stages of the design processes, including Virtual Commissioning. This technology allows to verify the functionality of the device and/or systems, generate OLP programs for robots and test the functionality of the PLC code on the virtual model. The article presents research into the possibility of implementing a robotic cell into a real flexible production system in the Laboratory in order to eliminate defective products after an automatic control through the Quality-handling station. This technology was verified on the basis of a methodology through a virtual system model and a virtual control system in the Software-in-Loop using the Siemens Tecnomatix Process Simulate software.

Open access
Measuring and evaluating the differences of compared images for a correct car silhouette categorization using integral transforms

Abstract

The present paper focuses on the analysis of the possibilities of using integral transforms for measuring and evaluating the differences of compared images (car silhouettes) with the purpose of a correct car body categorization. Approaches such as the light intensities frequency change, the application of discrete integral transforms without the use of further supplementary information enabling automated data processing using the Fourier-Mellin transforms are used within this work. The calculation of the several metrics was verified through different combinations that implied using and not using the Hamming window and a low-pass filter. The paper introduced a method for measuring and evaluating the differences in the compared images (car silhouettes). The proposed method relies on the fact that the integral transforms have their own transformants in the case of translation, scaling and rotation, in the frequency area. Besides, the Fourier-Mellin transform was to offer image transformation that is resistant to the translation, rotation and scale.

Open access
Integrative Programming of Production and Preventive Maintenance Tasks in an Environment of Identical Parallel Machines: Proposal of a Construction Heuristic

Abstract

The article presents a constructive heuristic for the integrated programming of production orders and preventive maintenance (PM) interventions in an environment of identical parallel machines, aimed at minimizing the completion time of the last scheduled job (makespan). Unlike other proposals found in the literature, the one here considers that the time between preventive interventions is not previously known, but instead, this is assumed as one of the decision variables of the system in the beginning of each of these interventions; in addition, the proposal also considers the possibility that not all jobs have the same release time. The design of the heuristic algorithm is based on the general approach of the Longest Processing Time dispatch rule, with a slight modification in its conception to consider the random character of the equipment failures and their impact on the execution time of the tasks. Consequently, a simple dispatch rule called rj - LPT was also proposed to comply with one of the steps of the heuristic, as well as an algorithm to determine the minimum dimension for the makespan, which constitutes the basis of the stop criterion linked to the initial solution.

Open access
Integrating Production and Maintenance Planning as an Element of Success at the Tactical Level: A Fuzzy Control Theory Approach

Abstract

This contribution focuses on the topic of the Production–Maintenance integration at the tactical level and what it presents to the correct functioning and success of companies. For these purposes, a general framework for the integration of production and maintenance planning at the tactical level is introduced and described within this paper. It considers the key elements from the Value Analysis, Fuzzy Control and the Reliability-Centered Maintenance theories and implements them into the context of an existing method for selecting maintenance strategies. The proposal mainly focuses and addresses the definition of 1/ the roles played by the fixed assets that do really add value to the production system, 2/ the best maintenance strategy for each asset, and also addresses 3/ the modifications that, may be needed in the tactical production plan due to potential capacity problems in the maintenance subsystem.

Open access