Istrazivanja i projektovanja za privreduJournal of Applied Engineering Science


ISSN: 1451-4117

E-ISSN: 1821-31977
Volume 9 article 193 pages: 267 - 275

Sasa R. Mitic
Faculty of Mechanical Engineering, University of Belgrade, Belgrade, Serbia

Branislav B. Rakicevic
Faculty of Mechanical Engineering, University of Belgrade, Belgrade, Serbia

Dragan D. Stamenkovic
Faculty of Mechanical Engineering, University of Belgrade, Belgrade, Serbia

Vladimir M. Popovic
Faculty of Mechanical Engineering, University of Belgrade, Belgrade, Serbia

This paper shows elaborated theoretical-experimental method used to optimize dynamic behaviour of modular superstructures of firefighting vehicles. Harsh exploitation conditions under which fire­fighting vehicles operates and special requirements for this type of vehicles require dedicated ap­proach to optimization of superstructures in terms of stress, deformation, fatigue, noise, comfort and effectiveness. Optimization implies selection of optimal shapes, materials, dimensions, mountings, suspension, damping and insulation of modules to attain optimal dynamic behaviour of superstruc­ture. Method described in this paper can be divided into two interconnected parts - theoretical and experimental. Theoretical part consists of numerical modelling of superstructure variants and calcu­lation of their responses to dynamic excitations using FEM, whose results are later validated through experiments. Experimental part of this method is based on excitation of superstructure physical models with, for this purpose specially developed, mechanical exciter, monitoring of superstructure response and changing of the input parameters in the design of superstructure to create the super­structure with best possible dynamic characteristics. Natural frequencies of structures, important in terms of resonant zones, are obtained using bump tests and FFT analysis. This method has proved suitable for optimization of dynamic behaviour of modular superstructures such as those of firefight­ing vehicles. Complete testing installation used in this method is illustratively shown in this paper. Also, there are guidelines for further development and improvement of this method.

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This paper is a part of projects of The Ministry of Science and Technological Development of Serbia (project number TR035045 - "Scientific- Technological Support to Enhancing the Safety of Special Road and Rail Vehicles” and project number TR035040 - "Developed New Methods for Diagnosis and Examination of Mechanical Structures”).

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