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Outsourcing av reservdelar. Studie på lokala små och medelstora företag / Outsourcing of spare parts : Study of SMEs enterprisesPersson, Karina January 2019 (has links)
The purpose of this work is to investigate the extent to which small and medium-sized manufacturing companies handle spare parts with the help of outsourcing, what factors influence the decision, and what effect it has on the maintenance in general. The aim of the study is to identify any challenges that outsourcing of spare parts management creates. The goal of the study is to answer the two following research questions: ⦁ What are the driving forces for outsourcing spare parts management? ⦁ How is maintenance at large is affected by outsourcing of spare parts management? It is important to note that due to the unpredictable demand and uncertainty about spare parts, stock planning and demand forecasts are challenges for spare parts managers. This is a problem that can be solved with the right outsourcing strategy. It is a challenge for companies to find the right solution based on their manufacturing and time-to-failure rate. The study is conducted with semi-structured interviews with people who are directly connected to spare parts management and maintenance. Three different companies, about the same size on local level have been taken in the study. The study has found that there is a significant connection to how outsourcing affects maintenance and which factors must be considered. There is clear potential for increased profitability through outsourcing spare parts management. The results of the study cannot be generalized but must be applied based on the conditions the company has. Currently, more and more companies choose to outsource the spare parts management. This question needs to be studied deeply in every segment to display what advantages and disadvantages this option can have for specific enterprises on different levels
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Machine Tool Spare Parts Provisioning for Manufacturers: A Study and Application for Industries Engaged in Aluminum Cutting and ShapingBarker, David W. 12 1900 (has links)
This study identifies the concepts of reliability, cost of downtime, cost of spare parts, and procurement lead time as the four key moderators of spare parts availability. These concepts are used to establish a model to manage spare parts inventories. Reliability was assessed in terms of developing failure predictions for major component categories. Cost of downtime was evaluated by identifying various methods for determining costs associated with downtime. Cost of spare parts was examined to find correlations with economic indicators. These correlations were used to predict future price movements. Yearly changes in lead time were identified and correlated with economic indexes to develop movement predictability.
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Improved Spare Part Forecasting for Low Quantity Parts with Low and Increasing Failure RatesLowas, Albert Frank, III 01 June 2015 (has links)
No description available.
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Decision-making framework for inventory management of spare parts in capital-intensive industriesDu Toit, Deirdre 12 1900 (has links)
Thesis (MEng)--Stellenbosch University, 2014. / ENGLISH ABSTRACT: Effective management of spare parts inventory is essential to companies because
it influences inventory costs and asset utilization. The vast and diverse
portfolio of spare parts, intermittent demand patterns and contradicting objectives
between departments are examples of some of the factors that complicate
Spare Parts Management (SPM). Managers of spare parts are faced
with trade-off decisions between risk and cost on a daily basis. These decisions
include, amongst many, determining appropriate stock levels and order
frequencies. Despite the importance of SPM, decisions are however often made
intuitively in practice with little factual support, and the decision-making process
is commonly constrained within departmental silos. Even though there
is a large body of academic knowledge on this topic, practical applications of
spare parts inventory solutions lag behind theoretical studies.
The majority of studies in literature focus on single components of SPM, such
as demand forecasting and parts classification, whereas fewer studies consider
the decision-making process itself. This study proposes a decision-making
framework for spare parts inventory management. The framework is based on
a wide-ranging literature review that focuses on capturing the essence of Spare
Parts Management (SPM), but also acknowledges the interconnectedness of the
problem. Therefore, core inventory management principles, as well as closely
related topics such as Supply Chain Management (SCM) and Physical Asset Management (PAM), are studied in the context of spare parts. The broad
scope of the literature study leads to a holistic approach to the problem and
prevents sub-optimization.
The proposed framework condenses principles from various fields of study
(SCM, PAM, Classification and Inventory Management) into a stepwise methodology
presented as a decision-making framework. The objective of the framework
is to provide managers with a structured process, based on factual information,
to enable better decision-making in the field. Furthermore, the
framework aims to capture the fundamentals of SPM in a simplistic manner
to ease the adoption of the framework in practice. A case study is conducted
in the South African mining industry to validate the framework. The case
study demonstrates that the framework is practical, provides structured guidance,
and assists managers to make trade-off decisions in managing spare parts
inventory. / AFRIKAANSE OPSOMMING: Effektiewe voorraadbestuur van onderdele is belangrik vir maatskappye omdat
dit voorraadkoste en die benutting van bates beïnvloed. Die bestuur van onderdele
is ’n komplekse probleem. Ondermeer is die portefeulje van onderdele
items breed en divers, die vraagpatrone sporadies en word die voorraadvlakke
geaffekteer deur kontrasterende doelwitte tussen verskillende departemente.
Bestuurders van onderdele word daagliks gekonfronteer met besluite rakende
risiko’s en kostes, soos om toepaslike voorraadvlakke te bepaal en om te besluit
wanneer om bestellings te plaas. Hierdie besluite word dikwels intuïtief
geneem met min feitelike ondersteuning en insette in die besluitnemingsproses
word gereeld beperk tot sekere departemente. Ten spyte van die geweldige
akademiese belang in die onderwerp, is daar min suksesvolle praktiese toepassings.
Die meerderheid van studies in die literatuur fokus op spesifieke elemente van
onderdele bestuur, soos vooruitskatting en klassifisering van parte, terwyl minder
op die besluitnemingsproses konsentreer. Hierdie studie stel ’n besluitnemingsraamwerk
vir die bestuur van onderdele voorraad voor. Die raamwerk is
gegrond op ’n deeglike literatuurstudie wat die essensie van onderdele bestuur ondersoek, maar ook die interverbondenheid van die probleem in ag neem.
Voorraadbestuurbeginsels en verwante onderwerpe soos Voorsieningskettingbestuur
en Fisiese Batebestuur word dus bespreek. Die breë omvang van die
literatuurstudie lei tot ’n holistiese benadering wat sub-optimering van die
probleem voorkom.
Die voorgestelde raamwerk som beginsels uit verskillende relevante studievelde
op in ’n stapsgewyse metode wat voorgestel word as ’n besluitnemingsraamwerk.
Die doel van die raamwerk is om bestuurders te voorsien met ’n gestruktureerde
proses, gebaseer op feitelike inligting, om besluitneming in die
veld te verbeter. Verder poog die raamwerk om die fundamentele konsepte
in voorraadbestuur vas te vang in ’n eenvoudige manier sodat die raamwerk
maklik geïmplementeer kan word in die praktyk. Die voorgestelde raamwerk is
gevalideer deur middel van ’n gevallestudie in die Suid-Afrikaanse mynbedryf.
Die gevallestudie toon dat die voorgestelde raamwerk prakties is, die besluitnemingsproses
op ’n gestruktureerde wyse lei, en bestuurders help om beter,
ingeligte besluite te neem.
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Klassificering av reservdelar för effektivare reservdelshantering / Classification of spare parts in order to achieve an efficient parts management.Utterberg, Oscar, Rand, Martin January 2018 (has links)
Syfte– Syftet med denna studie var att finna ett klassificeringsverktyg som kan underlätta beslutsfattande vid reservdelsuppläggning. För att besvara syftet formuleradestre frågeställningar; Vilket analysverktyg kan användas för att systematiskt klassificera reservdelar i olika grupper? Hur kan de klassificerade grupperna nyttjas vid reservdelsuppläggning? Hur kan efterfrågan prognostiseras för de olika klassificerade grupperna med hänsyn till servicenivå? Metod– Studien bedrevs deduktivt genom teoribyggande, med både en empiriskt fallstudie och analytisk konceptuell inriktning. De metoder som studien använts sig av är; litteraturstudier, intervjuer och insamling från dokumentstudien. Litteraturstudien har varit inom områdena; reservdelsklassificering och prognostisering. Resultat– Studiens resultat är att det krävs en multiklassificeringsmodell för att systematiskt klassificera reservdelar på grund av den komplexa naturen av reservdelshanteringen. Klassificeringsmodellen kan sedan utnyttjas till flera ändamål. De användningsområden som studien funnit är; hjälp vid bestämning av servicenivå, hjälp med val av prognostiseringsmetod för reservdelsgrupperna samt att finna reservdelar som har en skiftande efterfrågetrend. Implikationer– Klassificeringsmodellen ämnar sig till att underlätta företags reservdelsuppläggning. Med hjälp av modellen ska fallföretaget lättare kunna ta beslut så som vilken servicenivå och prognosmetod som kan användas för deras reservdelar. Begränsningar– Den här studiens begränsning är att bara ett fallföretag studerades på grund av tidsbegränsningen. Detta medförde att modellen som anpassades blev företagsspecifik och rekommenderas att valideras på andra företag. Nyckelord– Klassificering, Reservdelsklassificering, Beslutstöd, Prognostisering, Reservdelsprognostisering, Servicenivå / Purpose–The purpose of this study was to find a classification tool that can ease the decision-making process of spare parts planning and forecasting. To accomplish this, three research questions were formulated; Which analysis tools can be used for a systematic classification of spare parts into different groups? How can the classified groups be used when planning and forecasting spare parts? How can the forecasting be done for the different classified groupsconsidering thecustomer service level? Method– The study was deductively through theory-building, with both an empirical case study and analytical conceptual approach. The methods used were; litterateur research, interviews and collection of secondary data. The litterateur research has been conducted in the areas; spare parts classification and forecasting. Findings– The finding of this study was that a multi criteria method is needed for a systematic classification of spare parts, because of the complex nature of spare part handling. The classification model can then be used for multiple tasks. The tasks that this study found were; help in deciding the customer service level, help in choosing forecast method for the different spare part groups and finding the spare parts that have shifted in demand trend. Implications– The classification model intends to ease companies spare parts planning and forecasting process. With help from the model the case company should have a more effective process now in choosing which customer service level and forecasting method to use for their spare part. Limitations– This studies limitation was that only one case company was studied because of time constraints. This makes the modified model very company specific and needs to be further validated on other companies. Keywords– Classification, Spare parts classification, Decision support, Forecasting, Spare parts forecasting, customer service level
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Study on Preventive Replacement and Reordering of Spare Parts Experiencing On-Shelf DeteriorationLuo, Hongwei January 2016 (has links)
High availability of a system can be achieved by performing timely replacement of degraded or failed components. To this end, spare parts are expected to be available and reordered when needed. It is not uncommon that spare parts may deteriorate on the shelf because of their physical characteristics and/or the imperfect storage and transportation conditions. Such phenomena will affect the reliability of spare parts and the availability of the system. In this dissertation, we first focus on a system with single critical operating component and one unit of deteriorating spare part. For such a system, to ensure the system availability and cost efficiency, making a joint decision on component replacement and reordering time is of vital importance. In particular, we study both failure-switching and preventive-switching strategies, where cumulative damage is considered for the spare part switching from its in-stock to operating conditions. To determine the corresponding optimal component replacement and reordering policies, the long-run average costs are minimized under a fixed lead time. It is expected that the work will benefit quite a few industry sectors, such as mining, oil and gas, and defense, where the operation of systems heavily relies on capital-intensive components. To advance the research a step further, we have relaxed the system with only a single operating component to a more complex system with multiple components. In addition, we have eliminated the limitations on the order quantity and inventory capacity. To capture the on-shelf part deterioration, a two-phase deteriorating process is adopted, for which the first phase is from the spare's new arrival to the identification of its degradation, and the second phase is the period thereafter but before the unit fails. Based on the parts' degradation states, we introduce two different replacement strategies for the spare consumption, i.e., the Degraded-First strategy and the New-First strategy. Because of the random nature of component failures and on-shelf deterioration, stochastic cost models for both DF and NF strategies are derived. With the objective of cost reduction through coordinating the inventory and maintenance policies, an enumeration algorithm with stochastic dynamic programming is employed for finding the joint optimal solution over a finite time horizon. Numerical experiments are conducted to study the impacts of these two strategies on the operation costs, and the analysis of key parameters that affect the optimal solutions is also carried out in the numerical study. The joint policies of our interest focus on both replacement and reordering of spare parts, which are more realistic and complex than those policies handling maintenance and spare parts inventory control separately. In particular: When the maintenance planning and inventory control strategy are jointly optimized, we consider the spare parts inventory experiencing on-shelf deterioration, which has not been well studied in the related literature. When dealing with a system carrying only one spare part, the impact of on-shelf deterioration of the spare part on its remaining operational lifetime is explicitly dealt with and described by the Cumulative Exposure (CE) model. For the extended model for a multi-component system, we make an early attempt to adopt a two-phase process to take into account on-shelf degradation of parts. The issues in the degradation-level-based ordering of spare parts in the multi-component system are also discussed. Several integrated cost models are developed in both systems and are used to determine the optimal replacement and reordering decisions with the objective of minimizing the expected long-run cost rate over an infinite/finite horizon.
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An analysis and implementation of a land environment spare parts scaling model for the Canadian ForcesSwitzer, Jeffrey Charles, 1956- January 1988 (has links)
This thesis examines the spare parts mission scaling problem within the land environment of the Canadian Forces. A revision was done to the recently proposed Land Automated Scaling System, thus providing a readily implementable version of this model. This revised model determines the kit of spare parts for a first or second line unit to carry in order to maximize the operational availability of the deployed weapons systems, subject to a volume constraint. Bayesian methods and actual part demand data are used to revise the demand distribution to more accurately reflect the distribution of the number of parts required during a mission, taking into account the environmental conditions and usage mode of the equipment. The model is easy to use, requiring readily available and easily accessible input data. In addition, it can be operated on a Base minicomputer, thus allowing it to be used by the ordinance engineering and supply officers at the unit/formation level to produce and revise their parts scales as their situation requires.
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Inventory policy planning for spare parts and its application in the heavy-duty truck and bus industryAzran, Simon January 1994 (has links)
A dissertation submitted to the Faculty of Engineering, University of the Witwatersrand, Johannesburg, in fulfilment of requirements for the degree of Master of Science in Engineering. Johannesburg, November 1994. / Inventories are produced, used (e.g. for raw materials, supplies, spare parts, and So forth) or
distributed by every organisation. Moreover, inventories represent a major investment from the
perspectives of both individual firms and entire national economies. In addition, enormous costs
are incurred in the planning, scheduling, control and actual carrying out of
replenlshment-Iprocuretnentl related activities.
Interest in the subject of inventory management is constantly increasing, yet Silver and
Petarsonlll (P(eface) found that "although invi ,~ory management ha.l been studied in
considerable depth from a theoretical perspective, yet, those of us who, throuah consulting
work, come into. clos>!)contact with mananerlal decision procedures in this arer are repeatedly
surprised to find how limited, and ad hoc, many of the existing decision systems actually are.
The rate at which theory has been developed has far outstripped the rate at which decision
practices of firms have been successft,Jlly upgraded. A major g~o has existed between the
theoretical solutions, on the one hand, and the real world problems, on the other".
Inventory control is the science-based art of ensuring that lust enough inventory (or stockl is
held by an organisation to meet both its internal and external demand commitments
economically. There can be disadvantages in holding either too much 01 too little inventory.
Therefore, inventory control is primarily concerned with obtaining the correct inventory with
compromise between these two extremes.
The control and maintenance of inventories is a problem common to all enterprises in any sector
of a given economy. The primary aim of this study is to identify What the inventory policy of a
company shoull;I be to Secure a reduction in inventory-related costs while maintaining a high
level of customer service.
Lewis(2) defines two bMlt:~ tvpes of inventory policy. Those in which decisions concerning
replenishment are based on the lellel of inventory held, are known as "fixed-order quantity
models" or "re-order level policies" and those in which such declslons arc made on a time basis
are known as "fixed-time period models" or "re-order cycle policies". According to Nadder(3)
(7I 11) the basic distinction between fixed-order quantity models and fixed-tlme period models
is that the former are "event-triggered" while the latter are "time-triggered". That is, a
fixed-order quantity model initiates an order when the "event" of reaching a specified re-order
level occurs. This event may take place at any time, depending on the demand for the items
considered. In contrast, the fixed-time period model is limited to placing orders at the end of a
predetermined time period; hence, the passage of time alone "triggers" the model.
In this thesis, we shall discuss both classical inventory models and heuristic models. We shall
also conduct an investigation into the factors affecting high levels of inventory ~ mainly lead
times (supplier and internal lea' times) in relation to spare 9arts in the heavv-dutv truck and bus
industry. The thesis also suggests guidelines for controlling stock or these types of commodities
in a practical environment. This will be done by either researching the existing inventory models
or developing new inventory models or a combination of both, the intention being not to look for
absolute optimisation, but rather to achieve significant improvements over current operations. / GR 2016
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Framtagning och implementering av arbetssätt för utveckling av kostnadseffektiva reservdelar / Development and implementation of an method for cost-efficient spare partsMikael, Olsson January 2018 (has links)
Detta examensarbete har utförts som en del av civilingenjörsprogrammet i maskinteknik vid Karlstads Universitet i samarbete med Valmet. För Valmet är försäljning av reservdelar är en vital del av deras totala affär. I avsikt att stärka konkurrenskraften mot kunder i framförallt lågkostnadsländer vill Valmet erbjuda mer kostnadseffektiva lösningar genom att utveckla konstruktionen på befintliga reservdelar. Målet med examensarbetet var därför att ta fram ett systematiskt arbetssätt för produktutveckling av kostnadseffektiva reservdelar och validera det genom implementering på en befintlig produkt i Valmets reservdelssortiment. Underlaget till det framtagna arbetssättet samlades in genom att utföra en litteraturstudie, en nulägesanalys på Valmet och en intervju på ett företag som är framgångsrikt inom eftermarknad. Arbetssättet syntetiserades som en process med stöttande riktlinjer genom att utgå från Valmets befintliga utvecklingsprocess och integrera teoretiska modeller, principer och verktyg ur vetenskaplig litteratur. Arbetssättet testades sedan på lutmunstycken för sodapannor. Grunden för det framtagna arbetssättet bestod av en kombination av Value Management och Design to Cost. Fokus i arbetssättet ligger vid att utveckla en reservdel som återställer systemet till sitt normala arbetstillstånd, för ett pris som kunden är beredd att betala, och som balanserar tillförlighet med tillgänglighet så att den totala kostnaden för kunden minimeras. Genom att implementera det framtagna arbetssättet på lutmunstycken för sodapannor kunde ett förslag på en lösning med 66 % lägre pris och med 50 % lägre total kostnad för kunden tas fram. Implementeringen visade att arbetssättet praktiskt kan användas på enklare reservdelar men att det behöver testas på komplexa produkter av ett tvärfunktionellt team innan det används av Valmet. Arbetssättet stärker Valmets förutsättningar för att erbjuda ett mer kostnadseffektiv reservdelsortiment.
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Development of a Methodology for Creating Families of PartsMarr, Gregory M. 14 May 1999 (has links)
The purpose of this thesis was to develop methodologies and procedures for the construction and use of CAD part families. This project uses the software CADDS5 created by Computervision, Inc., and its "Family of Parts" module. This software allows the creation of an entire family of similar parts using a single parametric master model and a text file containing the necessary parameters for each member of the family. CADDS5 users at Raytheon were surveyed to determine how they use standard parts, what types of standard parts are used, and typical modeling strategies. A set of criteria were developed to determine which groups of parts would be good candidates to be used as test cases. Four test cases were used to develop the methodology or procedure for the creation of families of parts. In addition, efficient use of these part families required the development of a set of search engines to allow the users to find parts more easily, and a parts server to generate new family members. The Family of Parts software in CADDS5 serves as a starting point for the creation of a usable library of standard parts. However, it has a poor user interface and has no system for part management and database administration. This thesis has made up for several of these shortcomings, and has created the core of a working library that can be easily used by all of the designers without requiring detailed knowledge of the details behind the implementation. The methodology developed during this project provides the necessary information for designers to create the majority of standard parts in use at Raytheon. For those who want to expand the library, it has provided useful information that will help them create high-quality parts that will work well with this system.
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