scholarly journals Maintainability Approach: Hydraulic Pump with External Gears Explored with Design for Disassembly and Augmented Reality

2021 ◽  
Vol 11 (2) ◽  
pp. 666
Author(s):  
Angelica Lucia Ritucci ◽  
Leonardo Frizziero ◽  
Alfredo Liverani
Keyword(s):  
Augmented Reality ◽  
Preventive Maintenance ◽  
Target Component ◽  
Hydraulic Pump ◽  
Design For Disassembly ◽  
Handheld Device ◽  
Mechanical Parts ◽  
Disassembly Sequence ◽  
Metaheuristic Methods

The work carried out has the purpose of improving and optimizing various industrial technical operations, such as preventive maintenance, taken here as an example of application, using the Design for Disassembly (DfD) technique. Therefore, through four metaheuristic methods that have been chosen among the most widespread in the field (described below) to make a comparison between them, the optimal disassembly sequence is sought, if it exists, in terms of time and then costs in order to extract a target component without damaging the other mechanical parts of the assembly. The hypothesis that has been tested throughout this case study is “a responsible application of DfD, not only from the design process of a product but also during the disassembly procedure, can bring substantial benefits to the company”. Interaction with a hypothetical operator in charge of the work to be performed is implemented with the use of augmented reality. In fact, through an application programmed for an Android device (in this case, a mobile phone, hence a handheld device), the operator can be instructed step-by-step on the disassembly sequence in dynamics as an animation. Finally, two virtual buttons were added in augmented reality with which the operator can start and pause/resume the animation at any time to facilitate the understanding of the different steps established by the sequence.

scholarly journals Maintainability of a Gearbox Using Design for Disassembly and Augmented Reality

Machines ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 87
Author(s):  
Martina Marruganti ◽  
Leonardo Frizziero
Keyword(s):  
Life Cycle ◽  
Augmented Reality ◽  
Environmental Impact ◽  
Product Design ◽  
New Products ◽  
Competitive Market ◽  
Market System ◽  
Design For Disassembly ◽  
Disassembly Sequence

Environmental impact and recycling have been increasingly frequent topics in recent years. At the same time, the life cycle of products has increasingly become shorter, as the escalating competitive market requires new products in smaller pieces. From this perspective, the recovery of parts and products that are produced in this market system for subsequent reuse when they reach the end of their life cycle is essential. For these reasons, it has become critical that companies re-evaluate their product design with a view to the possible recovery of the parts that comprise their products and to create new products for the market. The following discussion was based on the study of design for disassembly (DfD), which is the analysis of industrial products aimed at optimizing disassembly in terms of time and costs. The application of the DfD to a case study of a gearbox has, among its main objectives, the search for the best disassembly sequence in terms of time and money. During the course of the study, augmented reality (AR) was used. Through the use of the Unity software and Vuforia package, it was possible to bring the gearbox back to AR and then simulate the disassembly sequence in AR.

scholarly journals Design for Disassembly (DfD) and Augmented Reality (AR): Case Study Applied to a Gearbox

Machines ◽  
2019 ◽  
Vol 7 (2) ◽  
pp. 29 ◽  
Author(s):  
Leonardo Frizziero ◽  
Alfredo Liverani ◽  
Gianni Caligiana ◽  
Giampiero Donnici ◽  
Luca Chinaglia
Keyword(s):  
Life Cycle ◽  
Augmented Reality ◽  
New Technologies ◽  
Industrial Sector ◽  
Design For Disassembly ◽  
Theoretical Concepts ◽  
The Past ◽  
The World ◽  
Required Quality

Today’s market drives companies to change, adapt, and compete. Many consumers are increasingly looking at price, without sacrificing quality. In order to be attractive to the customer, companies must be able to offer the required quality at the lowest possible price. The life cycle of many products has been shortened compared to the past because now technologies are evolving faster. For these reasons, it is important that companies reevaluate all the operations that are carried out within them, to optimize them and eventually adopt new technologies if they offer interesting opportunities. In this discussion, we first study the design for disassembly, a technique that can bring several advantages during the life cycle of a component, offering the possibility of reducing time and cost of disassembling a product, and better reuse of the different materials of which it is composed. Subsequently, augmented reality is discussed, and how this technology is exploited in the world, especially in the industrial sector. During the work, we discuss a case study, with the gearbox being the object of analysis. This allows us to apply the theoretical concepts illustrated in a concrete way, allowing for a better understanding of the topics.

scholarly journals Design for Disassembly and Augmented Reality Applied to a Tailstock

Actuators ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 102
Author(s):  
Marco Freddi ◽  
Leonardo Frizziero
Keyword(s):  
Augmented Reality ◽  
Cutting Edge ◽  
Target Component ◽  
Design For Disassembly ◽  
Starting Point ◽  
Maintenance Process

The work here described aims to offer a starting point for improving and making a generic maintenance process more efficient, first of all thanks to the use of a cutting-edge technology such as augmented reality, as a key tool that makes it possible and immediate to communicate to operators which are the fundamental stages of the maintenance process to be followed in the working area. Furthermore, thanks to the use of two methods applied in the context of the Design for Disassembly (later described), we also propose to search for all the possible sequences to get to the removal of a target component to be adjusted—in particular the optimal one (if it exists, in terms of time and costs) to be subsequently applied in an augmented reality “self-disassembly” model that can be viewed and followed by the operator, in a way that is still very little used today.

Optimizing preventive maintenance over a finite planning horizon in a semi-Markov framework

2020 ◽  
Author(s):  
Antonio Sánchez Herguedas ◽  
Adolfo Crespo Márquez ◽  
Francisco Rodrigo Muñoz
Keyword(s):  
Preventive Maintenance ◽  
Recurrence Relations ◽  
Direct Calculation ◽  
Planning Horizon ◽  
Practical Implementation ◽  
Practical Application ◽  
Mathematical Solution ◽  
Accumulated Reward ◽  
Finite Planning Horizon

Abstract This paper describes the optimization of preventive maintenance (PM) over a finite planning horizon in a semi-Markov framework. In this framework, the asset may be operating, and providing income for the asset owner, or not operating and undergoing PM, or not operating and undergoing corrective maintenance following failure. PM is triggered when the asset has been operating for τ time units. A number m of transitions specifies the finite horizon. This system is described with a set of recurrence relations, and their z-transform is used to determine the value of τ that maximizes the average accumulated reward over the horizon. We study under what conditions a solution can be found, and for those specific cases the solution τ* is calculated. Despite the complexity of the mathematical solution, the result obtained allows the analyst to provide a quick and easy-to-use tool for practical application in many real-world cases. To demonstrate this, the method has been implemented for a case study, and its accuracy and practical implementation were tested using Monte Carlo simulation and direct calculation.

Solution space reduction of disassembly sequences generated automatically via computer aids

2014 ◽  
Vol 229 (16) ◽  
pp. 2977-2986 ◽  
Author(s):  
Louisa Issaoui ◽  
Nizar Aifaoui ◽  
Abdelmajid Benamara
Keyword(s):  
Solution Space ◽  
Target Component ◽  
Cad Model ◽  
Simulation Tool ◽  
Sequence Generation ◽  
Space Solution ◽  
Space Reduction ◽  
Automatic Sequence ◽  
Selective Disassembly

To develop a simulation tool for automatic disassembly in computer aid design (CAD) environment two difficulties are found: the huge space of generated sequences and their feasibility especially in combinatory generation. This article deals with automatic sequence generation for selective disassembly of mechanical product. Starting from a CAD model a new appropriate connection tree of a target component is constructed. This tree aims at reducing space solution by eliminatory rules. The generation of sequence is based on reading of connection tree branches and eliminatory tests of feasibility. The feasibility is checked by updating the disassembly mobility of each sequence’s element. A case study is presented to prove the effectiveness of the proposed approach.

Augmented Reality to increase efficiency of MEP construction: a case study

2021 ◽  
Author(s):  
Patrick Dallasega ◽  
Felix Schulze ◽  
Andrea Revolti ◽  
Martin Martinelli
Keyword(s):  
Augmented Reality ◽  
Increase Efficiency

scholarly journals Design of Condition-Based Decision Support System for Preventive Maintenance

2017 ◽  
Vol 20 (1) ◽  
pp. 19-22
Author(s):  
Róbert Galamboš ◽  
Jana Galambošová ◽  
Vladimír Rataj ◽  
Miroslav Kavka
Keyword(s):  
Decision Support ◽  
Decision Support System ◽  
Support System ◽  
Preventive Maintenance ◽  
Maintenance Costs

Abstract Presented paper deals with the topic of preventive maintenance. A decision support system was designed, incorporating historical as well as forecast information to calculate the time remaining to preventive maintenance. The designed system optimizes maintenance costs without any further investment and running costs. An algorithm of the designed system is introduced and a case study of its implementation is described in the paper.

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