Moreover, the model estimates the cost of the substation including direct and indirect costs, percentage of utilization of each resource (equipment and labours) and consumed amount of each material.Ģ. This is accomplished while addressing their availability as a constraint, maintaining different relationships between the activities, and taking into account the variable parameters. The simulation model shows the real-time sequence of events that the project would run through to finish all activities of the substation using shared resources. This investigation presents a simulation model to schedule the execution process of civil works of electrical substation using Anylogic software based on database excel file for input data entry to estimate the time and cost of the substation. The upside of these techniques is that they consider the possibility of interfering with project activities and moving shared resources crosswise over project activities to simultaneously optimize total project duration, total project cost, and aggregate variety of resource allocation (Zheng, Ng, & Kumaraswamy, 2005, Kim & Ellis, 2010, Ashuri & Tavakolan, 2015). To surmount these restrictions, several simulation and modelling techniques have been proposed to allow for the computer scheduling of construction projects. ![]() The main problem is that these traditional methods focus on nearby optimality at activity level and not on global optimality at project level (Ashuri & Tavakolan, 2015). The limitations are that they do not consider assigning resource accessibility limitations to project activities or the likelihood of time and cost savings through changing project schedules and resource modification (Kim & Ellis, 2010). Traditional project scheduling methods have limitations when used for these kinds of projects. The choice of resources is the most essential part of scheduling and ought to be considered in congruence with site limitations and the work to be attempted (Jaskowski & Sobotka, 2006). All these buildings share resources (eg, equipment, labours and raw materials). The works consists of multiple phases proceeding in parallel with each phase concerned with a group of buildings. Scheduling the execution processes for civil works in an electrical substation is a complex and challenging task. The construction of electrical substation projects includes electromechanical works and civil works. ![]() Additionally, it is utilized to change alternating current (AC) voltages starting with one level then onto the next, and/or change AC to direct current or direct current to AC. It is utilized to switch generators, equipment, and circuits or lines all through a system. The model is verified and validated on three different substations projects and a sensitivity analysis is conducted.Īn electrical substation is an auxiliary station of an electricity generation, transmission and distribution system where voltage is transformed from high to low or the reverse using transformers. Iii) resources utilization breakdown and amounts of materials consumed The proposed model provides the user with four main outputs with respect to the substation: i) resource loaded schedule, The main contributions of this model to the existent body of knowledge is to present at a macro level the scheduling and cost estimation of civil works for electrical substations while considering project variables and resource constraints. The model is built on Anylogic software using discrete event simulation method and utilizes excel files for data entry. To address the previously stated afflictions, this paper introduces a simulation model for the execution processes of civil works for typical electrical substations. Therefore, construction of substations faces complicated resource scheduling problems, whereby the need to persistently discover approaches to enhance construction performance. The scope of civil works in electrical substations includes construction of several buildings/components divided into parallel and overlapped working phases that require variety of resources and are generally quite costly and consume a considerable amount of time. ![]() Electrical substations are considered by many construction experts as complex projects.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |