Dusko Pavletic

University of Rijeka · Department of Industrial Engineering and Management

Managing complex manufacturing systems often requires the simultaneous management of multiple continuous improvement projects. These projects are interdependent, and their goals are aligned with the overall goals of the organization. Lean program management focuses on continuous improvement and aims to eliminate waste and maximize efficiency and pr...

The work was carried out as part of a project to improve the corrosion resistance of welded joints. The optimal selection of input parameters reduces the consumption of welded material as well as the negative impact on the environment. The samples were welded by electrical resistance welding, more precisely by cross-wire welding. Electric resistanc...

Manufacturing systems design and planning often focus on current or short-term capacity and space requirements and neglect long-term future needs. However, due to changing market conditions, the importance of reconfiguring and adapting manufacturing systems to changes is becoming increasingly apparent. This paper presents a synergetic approach to t...

The reliable operation of a process plant is critical to the safety, performance, and profitability of a business. Failure Mode and Effects Analysis (FMEA) is a process of reviewing systems, subsystems, and equipment that identify potential failure modes, their root causes, and consequences. FMEA is also a risk assessment tool that has been used su...

In this study, a digital twin framework is presented to provide real-time prediction of environmental conditions and hydrodynamic performance for the purpose of risk assessment and optimal route planning. The concept of the digital twin is explained, and the main challenges associated with its implementation are highlighted. The authors provide a c...

The transition to digital manufacturing has become more important as the quantity and quality of the use of computer systems in manufacturing companies has increased. It has become necessary to model, simulate and analyse all machines, tools, and raw materials to optimise the manufacturing process. It is even better to determine the best possible s...

This paper describes the improved performance measuring model for vessel dry-docking. Dry-docking represents the operation where the vessel is put out of the water to clean and coat the vessels, and equipment check. This model deals with data collected from thirty-four completed dry-dockings, all supported by the Data Envelopment Analysis (DEA) met...

Quality control of welded joint is an indispensable part of the welding production process. As part of spot resistance welding group, cross-wire welding process showed great application for welding of products for everyday usage. The non-contact quality control checking is fit for purpose due to specific characteristics of welded products that cons...

Welding is one of the most widely used metal joining techniques. However, improper technique and handling may lead to weld defects. Cracks that occur during the exploitation of the welded joints in places of increased stress concentration are called fatigue cracks. In our previous study, we suggested that lowering the stress concentration in the zo...

The decision to introduce new process equipment is always a complex and risky process. An important competitive advantage in the automotive industry is the integration of new process equipment into the production system using different decision-making models composed of measurable key indicators, scientific methods and empirical values, study defin...

The research paper was prepared within the framework of a project whose aim is to improve the durability of the corrosion protection properties of the product by regulating the input parameters of the cross-wire welding process. Cross-wire welding is a subtype of electric resistance welding. Products made by the cross-wire welding process are widel...

Newbuilding dry-docking is a part of the shipbuilding manufacturing process, common for vessels built on slipways. The subject of this research is steel-built vessels intended for non-restricted sea-going navigation. Based on former experience, the necessity of the dry-docking projects measurement has been noted as a managerial tool for performance...

The aim of this paper is to introduce a multi criteria performance measurement model for newbuilding dry-docking purposes as a managerial tool. The dry-docking is presented as a process with multiple inputs and outputs, containing various technical and cost data related to the dry-docking project. The data envelopment analysis models with constant...

Surface cracks in butt-welded joints usually occur in places with increased stress concentrations. The stress concentration factor (SCF) can be calculated using an empirical equation, with five geometric parameters of a butt-welded joint (thickness of the base material, toe radius, weld toe angle, weld width, and reinforcement height). However, in...

Surface cracks in butt-welded joints usually occur in places with increased stress concentrations. The stress concentration factor (SCF) can be calculated using an empirical equation, with five geometric parameters of a butt-welded joint (thickness of the base material, toe radius, weld toe angle, weld width, and reinforcement height). However, in...

To avoid the occurrence of surface cracks at the welds, it is important to lower the stress concentration in the zone of the weld face by an appropriate choice of parameters. A plethora of experiments was conducted varying four welding techniques. The welded samples were scanned with 3D scanners and the toe radius was measured on each sample. The s...

Nowadays 3D technologies are integrated into all aspects of modern lives. This integration of 3D technologies paved new paths for further expansion of other fields, most recently the field of arts. In this paper bridging the symmetry-related gap between physical and digital sculpting by application of reverse engineering modeling was presented. Thi...

In many industries, there is a growing need to produce products with strict tolerances of individual product characteristics. Increasing productivity and profitability are also sought, demanding the production of more products per unit time, and at a lower cost with the available production equipment and with minimal investment. A strong competitio...

Implementation of quality management systems within different business operations are supported by several models of quality management, business excellence, etc . The best known models are EFQM, MBNQA and IPMA, on which many other applicable models are based. Most models of quality management are generic and can be applicable to a wide array of bu...

During the turning process, stresses appear within the tool.Knowing these stresses is crucial for selection of optimum cutting tool and avoidance of its fracture. This work reveals how various shapes, angles and radii of the cutting tool insert made of tungsten carbide affect the distribution of stresses in the cutting insert. Finite element method...

With conventional quality management methods and techniques used in repetitive projects it is possible to establish an efficient quality management and quality improvement system. The more efficient the system, the easier it is to identify points where errors are likely to occur and eliminate their consequences. Taking into consideration the fact t...

In the paper are presented research results of efficiency of quality assurance approaches in shipbuilding. By a differentiation-based approach to quality assurance, and by taking targeted corrective and preventive actions in the identified points of the pipe production process, in which errors are likely to occur, it is shown that certain quality i...

This paper provides the research of the influence of geometric and kinematic parameters on the microstructure and mechanical properties of welded joint of aluminum alloy AlSi1MgMn (6082-T6) obtained through the Friction Stir Welding (FSW) process. The experiment parameters were welding speed, rotation speed, angle of pin slope, pin diameter and sho...

Mass production of a complex products that requires engagement of a supply chain group lead to problem of synchronising and standardization within the supply group. Automotive industry is one of the first industries that created their internationally recognized standard and specific procedures. Those procedures are timeline-based, with specific req...

The paper presents results of analysis of welded joint types produced at section assembly of ship hull production. The welded joint analysis, made for a year production at selected shipyard, represents a base for assessment of current level of welding automation achieved in this early phase of ship production. Taking into account main principles of...

The paper explores the possibility of practical implementation of the process of continuous quality improvement in marine low speed engines cylinder liner casting, based on quality assurance tools, in 3 maj Engines & Cranes Inc. The aim of this study was to show the efficiency of the available quality assurance tools in costs reduction, productivit...

Purpose: of this paper is to introduce the reader to the characteristics of PDCA tool and Six Sigma (DMAIC, DFSS) techniques and EFQM Excellence Model (RADAR matrix), which are possible to use for the continuous quality improvement of products, processes and services in organizations.Design/methodology/approach: We compared the main characteristics...

Purpose: The pipeline production is one of major processes in shipbuilding industry. Quality improvement and risk assessment in this process can yield significant savings, both in terms of internal quality costs as well as in terms of customer satisfactions.Design/methodology/approach: Shipbuilding pipeline production quality improvement has been c...

The paper expresses base for an operational quality improvement model at the manufacturing process preparation level. A numerous appropriate related quality assurance and improvement methods and tools are identified. Main manufacturing process principles are investigated in order to scrutinize one general model of manufacturing process and to defin...

The paper is dealing with one segment of broader research of universality an systematicness in application of seven basic quality tools (7QC tools), which is possible to use in different areas: power plant, process industry, government, health and tourism services. The aim of the paper was to show on practical examples that there is real possibilit...

Quality management includes systematic usage of different methods, guidelines, techniques and tools in order to, through achievement of high quality products and processes, satisfy users’ demands and to achieve competitive advantages and business success. Raising the quality conscience in all business processes is a main goal of TQM, and it assumes...

This paper deals with the application of a Six Sigma methodology to the continuous improvement of an aluminium die-casting process. A Six Sigma improvement project was initiated in an aluminium die-casting process, with the aim to reduce the amount of machining scrap from an average of 4.12% to less than 2%, and the amount of material scrap from 11...

Purpose: The paper is dealing with one segment of broader research of universality systematicness in application of seven basic quality tools (7QC tools). The research was carried out in different areas that include power plant, process industry, government, health and tourism services. The aim of the research was to show on practical examples that...

To achieve continuous quality improvements every organization needs to use an appropriate selection of tools and techniques. The fundamental requirements for success are a clear understanding, both of the tools and techniques as well as the process by which they should be applied. In this paper we provide an overview and the fields of application o...

This paper reviews the basic approaches to total quality management, TQM, Fundamental Concepts of Excellence in their basic form and the criteria of quality award models for achievement of TQM. The Fundamental Concepts of Excellence provide us with the framework for achieving TQM, and they are based on the principles of TQM.

A simulation method has been used for a real shipbuilding process and its particular limitations to analyze various equipment configurations and product assortments. An approach based on a computer model of the shipbuilding production process and a simulation of various scenarios is proposed. The model of a real robotized production line for profil...

A simulation method has been used for a real shipbuilding process and its particular limitations to analyze various equipment configurations and product assortments. An approach based on a computer model of the shipbuilding production process and a simulation of various scenarios is proposed. The model of a real robotized production line for profil...

Purpose: of this paper: In the paper is presented a Six Sigma project, undertaken within company for production automotive parts, which deals with identification and reduction of production cost in the deburring process for gravity die-castings and improvement of quality level of produced parts.Design/methodology/approach: The objectives are achiev...

A complex quality initiative that address leadership, tools and infrastructure issue at the same time, called Six Sigma, have recently emerged. The objective of Six Sigma is to improve organization efficiency as well as effectiveness in meeting customer needs, ultimately creating economic wealth for the customer and provider. The application of Six...

This paper deals with application of Six Sigma methodology in process design. Using an example of compressor-housing machining process design and development at the Cimos facility in Buzet the possibilities for some Six Sigma tools applications are explained. The primary tools are the process map and the cause and effect matrix. A modified process-...

To maintain market share, suppliers to the automotive industry must be involved in the continuous improvement of their processes. They have to strive to perfect their processes as well as their overall business. Therefore, the search for appropriate improvement methods is ongoing, whether these methods are well known or completely new, e.g., six-si...

This paper deals with the application of Six Sigma methodology in process design. Using an example of compressor-housing machining the process design and development at the Cimos facility in Buzet and the possibilities for some Six Sigma tools' applications are explained. The primary tools are the process map and the cause-and-effect matrix. A modi...

Technological improvement in comparison to technological renewal, presents a greater project challenge, because it requires a more detailed approach in terms of defining input variables to meet user demands. In context of such improvement, denominated as refitting of the panel production line within, one of the major Croatian shipyards, the authors...

A complex quality initiative that addresses the leadership, tools and infrastructure issues at the same time, called Six Sigma, has recently emerged. The Six Sigma approach was based on rigorous Japanese theories of total quality management (TQM) for use in the manufacturing process. The objective of Six Sigma is to improve organization efficiency...

To establish welding parameters significance level and influence of welding parameters on occurrence of welded joints discontinuities and nonconformance it is necessary to perceive comprehensive welding parameters relationship as well as level of influence of each parameter. At present there are several tools for quality assurance and quality manag...