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

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

Analysis of Power Losses in Constrained Cycloid Drive

The aim of this paper is to present a theoretical model for efficiency evaluation of a simple cycloid drive train with one degree of freedom (DOF) or constrained cycloid drive. In order to evaluate the efficiency, it is necessary to find the losses generated in the simple cycloid drive, where only losses depending on the load were considered. Expressions for determining speed ratios, efficiency, velocities and forces acting inside the cycloid drive are presented. These expressions are implemented in the theoretical model, where the places where the losses occur are defined. A computer program was created to facilitate analysis and obtain loss values based on different input data. Only load-dependent losses were considered in the theoretical model and computer program. In order to verify the theoretical model, experimental measurements were performed. A physical model of the simple cycloid drive train was created and analyzed on the test bench. The results for "S1" operating mode, i.e. when shaft 2 is stopped, show a mean value of the efficiency of 63.49%, for experimental measurements, while the mean value for theoretical analysis is 65.25%. For the operating mode "S2", i.e. with shaft 1 stopped, the mean value of the experimental measurements of the efficiency is 60.9%, while the theoretical mean value is 62.82%