HYBRID MODELLING OF AN URBAN BUS

Sophisticated virtual prototyping methods have become a standard in the modern vehicle design process. Unfortunately, in many cases automobile manufacturers (in particular bus manufacturers) still do not take advantage of numerical de­sign techniques, basing instead on intuition and experience. In this paper hybrid modelling of an urban bus is presented. A hybrid bus model links different types of modelling that can be used to perform a wide range of virtual analyses of vehicle static and dynamic behaviour. The major objective of development and usage of a complex model is to reduce a time and cost of vehicle design process improving vehicle quality at the same time. The main advantage instead is a possibility to exploit a model for different performances of vehicle subsystems. A hybrid model representing real vehi­cle behaviour consists of three modelling techniques commonly used in automotive industry: multibody modelling, finite element modelling and multi- port (block) modelling. A full model has been developed via commercial software which ensures its availability among automotive engineers

Multi-material optimization of automotive structures /

Promotor: Tadeusz Uhl.Niepublikowana praca doktorska.Praca doktorska. AGH University of Science and Technology. Faculty of Mechanical Engineering and Robotics. Department of Robotics and Mechatronics, 2015.Bibliogr. k. 177-194.Selection of a proper structural material, selection of a joining technique for multi-material structures, structural materials in automotive design, automotive structural materials survey, high-strength steels, aluminum alloys, aluminum foams, magnesium alloys, plastics and composite materials, discussion on modern trends in material selection in the automotive Design, optimization theory, optimization basics, structural optimization, geometry optimization, material optimization, optimization type mono- and multi – objective approaches, mono-objective problems, multi-objective problems, data uncertainty and robust optimization, model reduction and approximation methods, design of experiments, factorial design, central composite design, uniform Latin hypercube design, metamodeling, polynomial models, radial basis functions, shepard - k-nearest method, gaussian processes, discussion and proposal of the multi-material structural optimization Scheme, multi-material structural optimization aluminum panel dynamic response, optimization assumptions, design objectives, design variables, additional limitations, physical model preparation and testing, numerical model preparation and testing, FE model refinement, sensitivity analysis, numerical model refinement, comparison of vibration mode shapes, preparation of the multi-layered sandwich model, multi-material optimization, robustness assessment, optimization results, quasi-optimal solution fabrication and testing, refinement of FE model of quasi-optimal solution, testing of additionally manufactured multi-material panels, multi-material optimization of a bus body structure, multi-material structural optimization bus structure modifications, design variables, objective functions, correlation of objective functions, preparation of the RS models, response surfaces accuracy, optimization run and results, structural adhesives, preparation of the specimens, temperature-humidity aging, Class I of SAE/USCAR-2 standard, Class V of SAE/USCAR-2 standard, thermal FE analysis of the multi-material specimens, strength testing conditions, strength tests results, elaboration of FE cohesive zone models CZM, FE analyses of the adhesively bonded joints, validation of CZM model, structural adhesives, introduction to optimization of a self - dumping semitrailer design, definition of the optimization problem, design variables, design constraints, load scenarios, design objectives, design of experiment and correlation between the objectives, metamodeling, optimization and selection of quasi optimal solutions, robustness evaluation and selection of the final quasi-optimal design, discussion multi-material structural optimization of a selfdumping semitraile

FINITE ELEMENT ANALASIS OF ADHESIVE BONDS USING THE COHESIVE ZONE MODELING METHOD

The paper covers the subject of FE modeling of adhesive joints, which is gaining more and more attention in the contemporary industry, especially in the aerospace and automotive sectors. This technique of creating structural connections possesses many advantages over mechanical or welding methods and it seems that it will be exploited extensively in the future mechanical design. Ability of joining dissimilar materials, decreased minimum member cross-section size and corrosion inertness can be considered as its most important features. However, in the era of virtual prototyping, it is necessary to conduct reliable computer assisted analyses of these type of joints. It is because most of the contemporary structures are developed as numerical models first, and only the final product is prototyped physically, to validate the simulation results. The aim of this paper is to demonstrate how to elaborate a reliable and accurate adhesive joint models, using a cohesive zone modeling (CZM) method. The major profitable consequence of using the CZM technique is that it introduces into the model relatively small number of spatial degrees of freedom, and therefore, allows for short computational times