https://ds.univ-oran2.dz:8443/jspui/handle/123456789/1869 Mon, 27 Jul 2026 08:31:19 GMT 2026-07-27T08:31:19Z https://ds.univ-oran2.dz:8443/jspui/handle/123456789/2086 Titre: Retrieval–travel-time model for free-fall-flow-rack automated storage and retrieval system Auteur(s): Metahri, Dhiyaeddine; Hachemi, Khalid Résumé: Automated storage and retrieval systems (AS/RSs) are material handling systems that are frequently used in manufacturing and distribution centers. The modelling of the retrieval–travel time of an AS/RS (expected product delivery time) is practically important, because it allows us to evaluate and improve the system throughput. The free-fall-flow-rack AS/RS has emerged as a new technology for drug distribution. This system is a new variation of flow-rack AS/RS that uses an operator or a single machine for storage operations, and uses a combination between the free-fall movement and a transport conveyor for retrieval operations. The main contribution of this paper is to develop an analytical model of the expected retrieval–travel time for the free-fall flow-rack under a dedicated storage assignment policy. The proposed model, which is based on a continuous approach, is compared for accuracy, via simulation, with discrete model. The obtained results show that the maximum deviation between the continuous model and the simulation is less than 5%, which shows the accuracy of our model to estimate the retrieval time. The analytical model is useful to optimise the dimensions of the rack, assess the system throughput, and evaluate different storage policies. Wed, 21 Mar 2018 00:00:00 GMT https://ds.univ-oran2.dz:8443/jspui/handle/123456789/2086 2018-03-21T00:00:00Z https://ds.univ-oran2.dz:8443/jspui/handle/123456789/2081 Titre: Reliability Analysis by Mapping Probabilistic Importance Factors into Bayesian Belief Networks for Making Decision in Water Deluge System Auteur(s): Guetarni, Islam H.M; Aissani, Nassima; Châtelet, Eric; Lounis, Zoubida Mon, 01 Jan 2018 00:00:00 GMT https://ds.univ-oran2.dz:8443/jspui/handle/123456789/2081 2018-01-01T00:00:00Z https://ds.univ-oran2.dz:8443/jspui/handle/123456789/2078 Titre: Effects of proof tests on the safety performance of safety-instrumented systems Auteur(s): Asklou, Noureddine; Rachid, Noureddine Résumé: The imperfection in the values of the average probability of failure on demand (PFDavg) creates uncertainty about the effectiveness of safety-instrumented system (SIS). To overcome this problem, many parameters such as dangerous failures, common cause failures, diagnostic coverage rate and proof tests are taken into consideration. In order to emphasise the importance of the proof tests and show their effects on the safety performance of the SIS, a new analytical formula is developed in this study. The impact of these tests on the SIS’s allocation of the safe integrity level (SIL) is shown through the results obtained in the present research. Mon, 01 Jan 2018 00:00:00 GMT https://ds.univ-oran2.dz:8443/jspui/handle/123456789/2078 2018-01-01T00:00:00Z https://ds.univ-oran2.dz:8443/jspui/handle/123456789/1901 Titre: NUMERICAL SIMULATION OF TURBULENT THERMAL MIXING IN A RECTANGULAR T-JUNCTION Auteur(s): BESSAID, Bouchra Sarah; Dellil, Ahmed Zineddine; Nemdili, Fadéla; Azzi, Abbès Résumé: This work reports three-dimensional simulation results of thermal mixing in a rectangular T-junction configuration at high Reynolds number. The validation data are provided by an experimental study done at the Department of Mechanical Engineering of Mie University, Japan. The T-junction was selected as a benchmark for thermal mixing in the ERCOFTAC Workshop held in EDF Chatou, France, 2011. Reynolds-averaged Navier-Stokes (RANS), unsteady Reynolds-averaged Navier-Stokes (URANS), and scale-adaptive simulation (SAS) were performed with CFD code using the finite-volume method. Velocity and thermal field as well as the turbulent stresses are reported and compared to experimental data in several longitudinal stations. It was found from the comparison that URANS methodology cannot reproduce the striping phenomenon, and secondly, that the SAS model fit better than the shear stress transport model with experimental data. Additional contours of averaged longitudinal velocity end thermal field as well as the flow structures developing in the channels are presented and discussed. Sun, 01 Jan 2017 00:00:00 GMT https://ds.univ-oran2.dz:8443/jspui/handle/123456789/1901 2017-01-01T00:00:00Z