152 research outputs found
Employing process simulation for hazardous process deviation identification and analysis
No full textTo improve industrial safety, several hazard analyses of processes are available. The HAZOP is one of the most frequently employed and analyzes hazardous process deviations based on heuristic knowledge. Despite the wide application of the technique, new developments are especially important to enhance industrial safety. In this sense a systematic procedure is proposed for hazardous process deviation identification and analysis that employs process simulation and heuristic evaluation. Process simulation enables the analysis of process behaviors caused by device malfunctions and the performance of deviation analysis that considers the process non-linearities and dynamics. A comparison between the HAZOP and the proposed procedure is presented using a pump startup system case study, wherein the better system interpretation and results regarding abnormal process conditions are highlighted. A second case study applies the procedures to an offshore oil production process, showing the advantages of employing process simulation for studying deviation during a dynamic process's abnormal behavior
Accelerating the parameters identifiability procedure: Set by set selection
No full textIn this paper, a numerical procedure based on the binary search is proposed for accelerating the parameters identifiability procedure. Basically, the parameters are selected set by set using a given criterion for ranking the parameters. Since parameters identifiability procedures are strongly dependent on the initial estimates of parameters values, simultaneous parameters re-estimation step has been proposed in this paper. Two examples were used to evaluate the performance of the proposed criterion. In both cases, a significant reduction of the computational time was observed, and the results regard to the model fit are similar to those criteria based on the selection of parameters one by one, as usually presented in the literature.Fil: Alberton, Kese P. F. . Universidade Federal do Rio de Janeiro; BrasilFil: Alberton, André Luís . Universidade Estadual do Rio de Janeiro; BrasilFil: Di Maggio, Jimena Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Planta Piloto de Ingeniería Química (i); Argentina. Universidad Nacional del Sur; ArgentinaFil: Diaz, Maria Soledad. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Planta Piloto de Ingeniería Química (i); Argentina. Universidad Nacional del Sur; ArgentinaFil: Secchi, Argimiro R. . Universidade Federal do Rio de Janeiro; Brasi
Erratum: A passivity-based decentralized strategy for generalized connectivity maintenance (International Journal of Robotics Research (2013) 32:3 (299-323) DOI:10.1177/0278364912469671)
No full textPaolo Robuffo Giordano, Antonio Franchi, Cristian Secchi and Heinrich H Bulthoff A Passivity-Based Decentralized Strategy for Generalized Connectivity Maintenance The International Journal of Robotics Research, Vol. 32(3): pp. 299-323 (2013) DOI: 10.1177/0278364912469671 Please note that several errors were introduced to this article during copy editing. These were pointed out by the authors but unfortunately due to a publisher error were not corrected. SAGE Publications would like to apologise to the authors and readers for these errors: Third author Cristian Secchi's name was incorrectly spelt Christian Seccos. In the following places pacifying' should be passifying': Page 310 right hand column, 2nd paragraph Page 310, right hand column, 2nd paragraph Page 311, right hand column, last paragraph Page 312 left hand column, 2nd paragraph In the following places ith' should be i-th': Page 302, right hand column, 3(rd) paragraph, twice on the 20(th) line Page 306, left hand column, 1st paragraph, 9(th) line after equation 12 Page 306, right hand column, 1st paragraph, 15(th) line Page 307, right hand column, 2(nd) line after Figure 7 Page 309, right hand column, 2nd paragraph, 6(th) line Page 309, right hand column, 3rd paragraph, 12(th) line Page 310, left hand column, 1(st) paragraph in numbered list, 3(rd) line Page 313, left hand column, 1(st) paragraph, 9(th) line after equation 40. In the following places kth' should be k-th': Page 307, left hand column, last line Page 308, right hand column, 2(nd) paragraph, 4(th) line In the following places hth' should be h-th': Page 308, left hand column, 1(st) line after equation 21 In the following places jth' should be j-th: Page 309, right hand column, 2(nd) paragraph, 7(th) line In the following places one-hop' should be 1-hop': Page 303, right hand column, 1(st) 3rd line from top Page 308, right hand column, 3(rd) line below equation 27 and last line Page 309, left hand column, 4(th) paragraph, last line Page 309, right hand column, 3(rd) line from top Page 309, right hand column, 1(st) paragraph, last line Page 309, right hand column, 3(rd) paragraph, 2nd lin
Authors’ reply to “Comments on ‘Object-Oriented Modeling of Complex Mechatronic Components for the Manufacturing Industry’
No full textIn his comments to our paper published on the IEEE Transactions on Mechatronics (Vol. 12, no. 6, pp. 696-702), Kleanthis Thramboulidis points out many issues related to the application of the Object-Oriented modeling approach proposed in the paper. The comments of Thramboulidis are relevant and properly referenced, especially considering the section about UML, its variants (i.e. UML 1.4, UML-RT, UML 2.0) and the conceptual elements of component based design. However, we believe that the author of the comments has focused his attention too much on the software implementation aspects, including engineering tools and run-time execution frameworks for the control software, which are actually outside the scope of the original paper. In this reply, we aim to emphasize the main contribution of the paper and analyse the issues raised in the comments, with particular regard on our plan to address them in future works
Sampled Data Systems Passivity and Discrete Port-Hamiltonian Systems
No full textIn this paper, we present a novel way to approach the interconnection of a continuous and a discrete time physical system. This is done in a way which preserves passivity of the coupled system independently of the sampling time T. This strategy can be used both in the field of telemanipulation, for the implementation of a passive master/slave system on a digital transmission line with varying time delays and possible loss of packets (e.g., the Internet), and in the field of haptics, where the virtual environment should ‘feel’ like a physical equivalent system.
Simultaneous Life Cycle Assessment and Process Simulation for Sustainable Process Design
No full textWhile there are software tools available for helping to conduct life cycle assessment (LCA), such as OpenLCA, these tools lack integration with process design, simulation, and optimization software. As LCA has a critical role in sustainable product design, this paper presents a platform called EMSO_OLCA, which integrates the LCA provided by OpenLCA into the Environment for Modeling, Simulation, and Optimization (EMSO). EMSO_OLCA incorporates a database of environmental impact assessment methodologies from OpenLCA and aligns with the principles of LCA outlined in ISO 14040 and ISO 14044. Validation tests were conducted to compare the results obtained by the LCA of sugarcane ethanol using OpenLCA and EMSO_OLCA, revealing a high level of agreement. The average relative error was 0.045%, indicating a negligible discrepancy between the tools. Moreover, it took only 0.3 s for the calculation, which is desirable for use with process system engineering tools. A second case study was applied to combined steam and electricity production from the combustion of sugarcane bagasse and straw in a combined heat and power system. The results show the integration of LCA with simulation and sensitivity analysis tools, thus supporting sustainable decision-making processes. EMSO_OLCA bridges the gap between LCA and process engineering, enabling a holistic approach to the sustainability, design, and implementation of environmentally friendly solutions
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