Ergonomic design of hammer handle to prevent musculoskeletal disorders and injuries

Suvremeni dizajn ručnog alata mora udovoljavati svim zahtjevima upotrebljivosti, sigurnosti i udobnosti. Današnja upotreba novih tehnologija u dizajnu, prototipiranju i proizvodnji omogućuje razvoj ručnih alata koji svojim oblikom, materijalom i završnom obradom omogućavaju bolju interakciju korisnika sa svojim alatom. U radu je opisan postupak dizajniranja i ocjenjivanja drške čekića koji bi povećao performanse, udobnost i sigurnost rukovatelja te istodobno spriječio mišićno-koštane poremećaje.Modern design of manual hand tools has to meet all requirements of usability, safety and comfort. Today\u27s use of new technologies in design, prototyping and production enables the development of hand tools that, with their form, material and finish, enable better interaction between the user and his tool. This paper describes the process of designing and evaluating a hammer handle that would increase the performance, comfort and safety of the operator and at the same time prevent musculoskeletal disorders

Modification of the QFD method for determining newspaper characteristics

Razvoj tehnologije i novih medija izravno utječe na novinsku industriju i rezultira padom naklada novinskih izdanja. Kako bi se osigurala održivost te smanjili troškovi u novinskoj proizvodnji pristupa se traženju pogodnih metoda i alata za unapređenje sustava upravljanja kvalitetom. Poznati sustavi upravljanja kvalitetom poput ISO 9001, TQM, Lean proizvodni koncept, te QFD metoda – evaluacija funkcije kvalitete sveprisutni su u različitim proizvodnim sustavima. Svaki proizvodni sustav, pa tako i proizvodni sustav novina mora zadovoljiti potrebe kupca ali i svih drugih zainteresiranih dionika – zaposlenika, vlasnika, dobavljača itd. Iako se QFD metoda uglavnom koristi za razvoj novog proizvoda, u radu se istražuje mogućnost primjene u novinskoj proizvodnji. Ispitivanjem efekata pojedinih alata u pojedinim segmentima sustava novinske proizvodnje i njihovom prilagodbom, razvijena je nova metoda – modificirana QFD testirana u novinskim tiskarama u kojima je provedeno istraživanje. Metoda se može primijeniti u novinskim tiskarama koje će na taj način proizvodne procese učiniti učinkovitijim i osigurati održivo poslovanje.Development of technology and new media affects the newspaper industry so that it results in decline of newspaper publication circulation. Suitable methods and tools to improve quality management system have been looked for to ensure sustainability and reduce the costs in newspaper production. Well-known systems of quality management such as ISO 9001, TQM, Lean manufacturing and QFD methods – Quality Function Deployment, are ubiquitous in production systems around the world. Each production system, including the system of newspaper production must meet the customer’s requirements and all other value chain participants by recognizing the newspaper product properties. Although the QFD method is mainly used for developing a new product, this paper explores the possibility of its implementation in the newspaper production. It affects the improvement of the production process by acting preventively to detect compatibility. By examining the effects of certain tools in certain segments of the newspaper production system and their adaptation, a new method was developed - modified QFD, tested in the newspaper printing houses the research was conducted in. The method can be implemented in the newspaper production systems and thus make production processes more efficient and ensure sustainable business

LIFETIME ESTIMATE OF PIPE SYSTEMS

Micro cracks have been found near some of the welds on the pipe unit. This paper investigates the root cause of this damage and suggests improvements to prevent such damage from occurring. The investigation includes several simulations using Pipestress and Ansys Mechanical, a welding and materials investigation, and a more theoretical creep investigation using the Larson-Miller parameter. A sensitivity study of the outlet pigtail installation and support configuration is performed as well as a cyclic plastic analysis. A complementary analysis of the catalyst tubes, inlet and outlet system shows that the only areas where the stress and strain indicate an elevated risk of damage are the areas around the ends of the outlet pigtails. Suggested improvements include reconfiguration and load reduction of constant hanger supports, improving welding procedures in order to lower residual stresses and undertake more material and on site investigations to verify causes of failure

Design and Analysis of Steel Reel Shaft by Using FEA

This paper describes the analysis of steel reel shaft as drive shaft in a process of umbilical spooling of wire rope. There is a need to investigate shaft behaviour in the conditions of increasing workload. The aim is to investigate avoiding possible redesign or enabling redesign with minimal costs. Stress analysis has been carried out by using finite element analysis (FEA) and results are compared with the analytically calculated values. Finite element analysis has been carried out using maximum stress criteria and the area of potential failure is found. The main objective of this paper is to find balance in results between "design by rule" and "design by analysis". Design by rule provides rules on how to design a steel reel shaft using analytical equations and other strict rules from design elements. Design by analysis provides rules on using numerical analysis, typically finite element analysis to design a steel reel shaft. The steel reel shaft has been geometrically modelled using SolidWorks. To check all stresses, linear static analysis is done using DSS Simulation and Ansys