The objective of this study is to propose analytical travel time models for aisle changing shuttle carriers (3D SBS/RS), which are capable of travelling in the horizontal and in the cross-aisle directions. The expressions for the single and dual command travel times have been determined assuming uniform distributed storage locations and the probability theory. A simulation model of 3D SBS/RS has been applied for the performance analysis of the proposed analytical models. The proposed models enable the calculation of the expected travel times for single and dual command cycles of the aisle changing shuttle carriers, from which the performance of the 3D SBS/RS can be evaluated.
COBISS.SI-ID: 21416470
In this paper, the level of the maturity index for the producer of steel bars by using models known as Industry 4.0 Maturity Index and the Digital Maturity Model 4.0. have been analysed. Assessment with the Industry 4.0 Maturity model revealed the relatively low level of the maturity index and the opportunity to invest resources in the company’s intralogistics process. For this reason, an automatic heavy load vehicle with a special steel cassette for carrying 50 tons of materials (SSBs) in one route has been used in our research study. In order to test the utilization and the system performance of a heavy load vehicle, the discrete event simulation has been applied. The logistics (i.e. availability of the overhead crane for loading and unloading the vehicle, transport between the production site and the product warehouse) along with technological process (throughput performance of the production plant) has been analysed. Location of workstations and workplaces as well as loading/unloading places for the transporter has been defined by the layout. According to the results of simulation analysis, the automatic heavy load vehicle outperforms the current transportation system in all three cases of the arrival rate. The general outcomes of the proposed research study is connectedness between the discrete event simulation and the maturity model. The simulation as an efficient tool is used to support managers in understanding the level of automation (maturity index) that can be applied for increasing the efficiency in their production systems.
COBISS.SI-ID: 513020221
This paper compares two shuttle-based storage and retrieval system (SBS/RS) configurations developed on a special design of SBS/RS with movable shuttles. Specifically, we compare two system configurations of SBS/RS: SBS/RS with tier-captive shuttles and SBS/RS with tier-to-tier shuttles. Due to a large number of shuttles in tier-captive SBS/RS, lifts are bottlenecks and the utilizations of shuttles are very low. In this research study, we propose an alternative SBS/RS design with tier-to-tier shuttles in which shuttles can travel between tiers by using a separate lifting mechanism dedicated for them. The advantage of this design is the reduction in investment cost due to the decreased number as well as higher utilizations of shuttles in the system, which we proved with a simulation study.
COBISS.SI-ID: 25139715
In this chapter contribution, we define information flow in the context of the green concept, industry 4.0, and supply chain integration. Supply Chain Integration describes how employees in a specific company along a supply chain and its trading partners work together to achieve common business objectives via integrated business processes and information sharing. In this way, material and information flows are established. Due to the competitiveness between supply chains and the trend to be more efficient and sustainable, we distinguish several phases of supply chain integration, from the oral negotiation and repetition of the same activities to automation and reduction in the number of activities. Recently, much attention has been paid to the concept of Industry 4.0, which is based on computerisation and connectivity. Digitalisation is recognized as a springboard for visibility, transparency, predictive capacity and adaptability or, in other words, for Industry 4.0, which inherently requires technological development. Information systems, as an example of technology, are an enabler for increased sustainability and greener supply chains. Currently, companies are at different stages of technology development, and the establishment of external integration depends on the digital development of each element of the supply chain. The current situation in companies reveals different degrees of maturity, both from the aspect of supply chain integration and from the aspect of Industry 4.0. In this paper, we reveal possible overlapping areas between different maturity phases of supply chain integration and the Industry 4.0 and further how different combinations of maturity levels define the information flow.
COBISS.SI-ID: 513020989
This paper presents analytical travel time models for the computation of cycle times and throughput performance of Automated Vehicles Storage and Retrieval Systems (AVS/RS) with multiple-tier shuttle vehicles. The proposed analytical models consider the multiple-tier shuttle vehicle with the condition of simultaneously travelling in a horizontal and moving in a vertical direction in the storage rack. Travel time models for single and dual command cycles of the AVS/RS with multiple-tier shuttle vehicles have been specified assuming uniformly distributed storage rack locations and the probability theory. The proposed analytical models enable the calculation of the expected cycle time for single and dual command cycles, from which the performance can be evaluated of AVS/RS with multiple-tier shuttle vehicles. A simulation model has been developed for evaluation of the proposed analytical models. Analysis of various types of AVS/RS showed good matching of the proposed analytical models with a simulation model.
COBISS.SI-ID: 36277251