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1

Aircraft fault forecasting at maintenance service on the basis of historic data and aircraft parameters

Pogačnik B., Duhovnik J., Tavčar J.

Eksploatacja i Niezawodność

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2017

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Vol. 19, no. 4

624--633

EN

Aircraft maintenance and repair organizations (MROs) have to be competitive and attractive for both existing and new customers. The aircraft ground time at MROs should be as short as possible and cost effective without reducing the quality of the work. Process optimization in MROs requires the continuous improvement of processes and the elimination of non-value-added activities during maintenance checks. There is, on the one hand, an obligation to follow the prescribed procedures and, on the other hand, pressure for time and cost reduction. The aircraft servicing process has been analysed according to a lean methodology. The optimization of logistics processes is recognized as the most promising method for reducing the maintenance service time and costs of spare parts. The probability of aircraft faults is calculated on the basis of historic data from previously completed service projects. Aircraft parameters, such as aircraft type, operator, aircraft age, flight hours, flight cycles, engine type and operation location, are taken into consideration in the fault forecasting. The fault probability is used as an indicator for defining a priority list for the accomplishment of jobs included in the aircraft maintenance service. The proposed methodology was validated and confirmed on four different projects.

PL

Organizacje zajmujące się konserwacją i naprawami statków powietrznych (MRO) muszą dbać o swoją konkurencyjność i atrakcyjność zarówno dla istniejących jak i nowych klientów. Czas trwania obsługi naziemnej w MRO powinien być jak najkrótszy a konserwacja powinna pociągać za sobą jak najmniejsze koszty, bez konieczności obniżania jakości pracy. Optymalizacja procesów przeprowadzanych w MRO wymaga ciągłego doskonalenia oraz eliminacji nieuzasadnionych czynności przeglądowych. Z jednej strony pracownicy MRO muszą przestrzegać określonych procedur, z drugiej zaś strony, ciąży na nich presja redukcji czasu i kosztów obsługi. Proces obsługi statku powietrznego analizowano zgodnie z metodologią szczupłego utrzymania ruchu. Optymalizację procesów logistycznych uznaje się za najbardziej obiecujący sposób redukcji czasu obsługi serwisowej oraz kosztów części zamiennych. Prawdopodobieństwo wystąpienia uszkodzeń statku powietrznego obliczano na podstawie danych historycznych z uprzednio przeprowadzonych prac obsługowych. W prognozowaniu uszkodzeń, uwzględniano takie parametry statku powietrznego, jak typ statku, jego operator, wiek, liczba godzin w powietrzu, liczba cykli lotów, typ silnika oraz miejsce stacjonowania. Prawdopodobieństwo wystąpienia uszkodzeń wykorzystano jako wskaźnik do hierarchizacji zadań obsługi technicznej statku powietrznego. Przydatność proponowanej metodologii zweryfikowano i potwierdzono na przykładzie czterech różnych projektów.

2

Tools for rapid product and process development

Brezovar A., Kušar J., Duhovnik J., Starbek M.

Prace Naukowe Instytutu Technologii Maszyn i Automatyzacji Politechniki Wrocławskiej. Konferencje

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2004

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Vol. 85, nr 42

49-54

EN

A company can enter the global market only if it can fulfil the customer needs regarding features and quality of products. Customers are becoming more and more demanding and their requirements are changing all the time. In these circumstances only that company can survive on the global market, which can offer its customers the right products in terms of features and quality, products which are produced at the right time and place, at the right quality and at the right price. When developing anew product the company has to pay special attention to fulfilment of the basic market requirement, i.e. as short new product development time as possible (as short delivery time as possible). This goal can only be achieved by reduction of product development time, while quality and cost of the product should be taken into account at the same time, which is possible if the concurrent engineering concept is used. The basic idea of the concurrent engineering is concurrent execution of formally sequential activities during new product development process. The article presents techniques and analyses of sequential and concurrent product development processes, the emphasis being on team work, organisational structures and tools needed for transition from sequential to concurrent product development process. The article also presents the results of implementation of concurrent engineering in an SME which produces civil engineering equipment.

3

How to achieve short lead time in the rapid production environment?

Berlec T., Kušar J., Duhovnik J., Starbek M.

Prace Naukowe Instytutu Technologii Maszyn i Automatyzacji Politechniki Wrocławskiej. Konferencje

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2004

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Vol. 85, nr 42

21-28

EN

In a global market the customer selects the supplier, which can provide short and reliable delivery dates. Delivery dates largely depend on duration of lead times, therefore the basic requirement of customers can be fulfilled only by gradual transition from workshop production type to flexible manufacturing systems (reduction of number of operations, reduction of transition times, overlap of operations) or by a suitable method for reduction of lead times of orders in a current workshop production type (without big investments). The article describes methods for reduction of lead times, the emphasis being given to the reduction of lead time of operation; the method is based on the analysis of current order flow through workplaces, computer-aided design of flow diagrams, definition of average lead times of workplaces, and finding the critical workplaces that have the biggest influence on lead times. Three-line ABC analysis is used to find out the critical workplaces. Presented are the results of lead time reduction in a tool production department which exports 30% of its production, 5% of its production is sold on domestic market and 65% of production is used by the company itself. The company has a strong competition on domestic and global markets and the only surviving strategy seems to be in shortening delivery dates (i.e. shortening lead times of orders).

4

Techniques and methods for product developments

Duhovnik J.

Prace Naukowe Instytutu Technologii Maszyn i Automatyzacji Politechniki Wrocławskiej. Konferencje

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2003

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Vol. 84, nr 41

93-102

EN

Product development depends on the requirements and the environment where the product is to be manufactured and put into use. A problem can be defined by means of rational perception of the problem and the analysis of the natural process and its subordinated substitute, referred to as technical process. Together with problem definition, the functional requirements and axioms, which enable the definition of the course of product development, are being perceived. The paper presents a logical correlation among particular individual activities. A particular emphasis has been placed on the use of the techniques of creative thinking for the purpose of creating a problem definition. By means of the techniques of creative thinking. The problem has been defined, which results in the form of design requirements. The descriptive matrix, de-lining the correlation between design requirements and functions, has been derived. Emphasis has been given to a dynamic search for correlations between descriptive and morphological matrices. Such concept of planning enables the connection from the construction requirements to functions and further on to the working principles. Tests, which the submitted methods have been subject to, have shown the possibility of formalized records.