Applied Mechanics and Materials Vol. 611

Abstract: In this paper an improved heat equation for fully coupled thermal structural finite element analysis is presented. In the problem solving process, mathematical formulation appropriate strain measures describing the onset and the growth of ductile and total damage and heat generation rate per unit volume for dissipation-induced heating have been employed. The model was implemented into a finite element code using an improved weak form for fully coupled thermal structural finite element analysis, an extended NoIHKH material model with internal damping for cyclic plasticity of metals capable of modelling ductile material behaviour in wide range of strain rates. A notched aluminium alloy specimen in cyclic tension using 2Hz excitation frequency and linearly increasing amplitude has been studied. The model verification showed excellent agreement with available experiments. A few selected analysis results are presented and briefly discussed.

Abstract: The modern systems developed for a control of ignition and fuel injection in the racing piston combustion engines require a continuous supplementation of the input information, together with permanent monitoring and correction of these input data. Such operations are performed by means of specialized software, which is able to decode the maps of active data fields as well as to modify them afterwards in the framework of the required values. The correct editing of the data field enables a faster and more accurate distribution of the active values.

Abstract: The paper discusses optimizing of centre differential heavy truck wheel without reductions. Under optimization in this case is meant the differential type customizing cabinet designed for easy gear to withstand heavy load of a new gear. Critical structural adjustment of high-voltage areas must be such that tensions are reduced. The basis for this optimization is the result of task solution by finite element method.

Abstract: Many service mobile robots have an articulated robotic manipulator mounted on their platform. The mobile platform extends the workspace of the arm, whereas the arm offers several operational functionalities. The basic idea is to mount two cameras to the robotic arm. One camera provides the perception of the surrounding environment and navigation of the robot, the second one located on the robot arm provides for the perception of the object of cooperation. This paper deals with an early-stage design process of the mentioned robotic manipulator using dual visual perception. It includes kinematic, dynamic and stress-strength analysis. For the kinematic analysis the homogeneous matrix method and for dynamic analysis the Newton-Euler method has been used. These analyses are required for control solution.

Abstract: In current practice the use of mathematical models is substantially widespread, reason being the recent increase in development of programs for this purpose, with the option of model simulation in a virtual environment, proportional to the evolving computer technology. The article contains a mathematical model created using Matlab program. The simulation results are compared with scientific literature that addresses DC motors and evaluated. For simplicity, a graphical interface was created.

Abstract: In the paper are investigated the eigenfrequencies of single-walled carbon nanotubes (SWCNTs) by the analytical method based on nonlocal theory of beam bending. A continuum approach is applied for eigenfrequency computation of SWCNTs with four types of beam end conditions: clamped-free (C-F), simply-simply supported (S-S), clamped-simply supported (C-S) and clamped-clamped (C-C).

Abstract: Logistics is primarily to address issues with whose functional, organizational, personnel and material means can be improved and optimize the entire course material flow businesses, which shall logistics integration business functions. Production logistics means a sum of logistical tasks and measures for preparation and execution of the production process. Includes all activities associated with material and information flows of raw materials, auxiliary and production materials from the warehouse to the production of raw materials and semi-finished goods from the warehouse and purchased parts through the various steps of the manufacturing process including all buffer stores, through the installation of the finished goods warehouse.

Abstract: The automobile industry has shown an increased interest in the use of composite leaf springs due to their high strength to weight ratio. The introduction of composite materials has made it possible to reduce the weight of the leaf spring without any reduction in load carrying capacity and stiffness. In this paper, the results of research on fatigue life of composite (Glass Fiber Reinforced plastic – GFRP) leaf springs are presented. Composite springs were designed in such a way that they could replace steel springs in a van.

Abstract: The paper presents the possibility of using polymeric materials in the automotive industry. Some of the requirements for materials have been discussed and the possibilities of a significant increase in strength of the materials by the use of reinforcements have been indicated. Numerous examples of applications of reinforced plastics as automotive parts have been presented. Some of the latest technologies that enable the production of automotive parts from reinforced plastics, including hybrid structures, have been described.

Abstract: The nature of the application of ABC/XYZ analysis lies in the use one of the simple tools of quality management. It is based on the Pareto Principle 20/80. It can be applied in a variety of modifications and various areas of the production value chain. This article is formulated as a case study of ABC/XYZ analysis in practice and its contribution to the development the company material portfolio.