Identification of Vibration Parameters for Motor Vehicles

Abstract

Identification of the vibration parameters of motor vehicles, as well as of dynamic systems in general, represents a complex problem. Many experimental-theoretical procedures have been proposed in order to solve the problem but there is no generally accepted method. The development of a method for the iden~ification of the vibration parameters of motor vehicles is described in this paper. The identification of the unknown parameters is achieved by the use of experimental data applied to an vibration model with a known structure but unknown physical parameters. The methods of nonlinear programming are employed in the computations. The elastic and damping elements, including the tyres, are also by assumption nonlinear. Verification of the reliability of the method is carried out by using two vibration models of the vehicle -one with known and the other with unknown values of the vibration parameters.

A contribution to the modeling of truck powertrain vibration

“…U literaturi se, u zavisnosti od zadatka koji se rešava, mogu naći različiti mehanički modeli pogonske grupe i vozila. Iz [1,[2][3][4][5][6][7][8][9][10][11][12] je poznato da se u toku analize problema prenošenja dinamičkih opterećenja sa pogonske grupe na okvir teretnog vozila mogu zanemariti oscilacije kabine i tovarnog sanduka. Preciznije rečeno, u analizu se uključuju samo oscilatorna kretanja pogonske grupe vozila i odgovarajuće pobude od okvira vozila.…”

Measurement of vehicle parameters of motion without gyro-stabilized platforms

“…Zbog toga sistem jednačina mora biti rešen numerički. U te svrhe je u početnom stadijumu istraživanja korišćena metoda linearnih iteracija, ali, zbog loše konvergencije rešenja, nije dala zadovoljavajuće rezultate, pa je usvojen postupak zasnovan na optimizaciji, uz korišćenje metode Hooke-Jeevesa [4][5][6][9][10][11][12][13]. Pri tome je minimiziran kvadrat grešaka između izračunatih vrednosti pomeranja tačaka 1 i 2 datih izrazom (2) i izmerenih veličina pomeranja datih izrazom (4).…”

Contribution to research of thermal loads in commercial vehicles powertrain mounts

“…The vibrations of the powertrain are also influenced by the vibrations of the vehicle frame, which are incidental (Demić, 1997a), (Demić, 1997b), (Shanguan et al, 2016). Since the complexity of the vehicle spatial model exceeds the scope of this paper, it was considered appropriate not to use frame excitations obtained based on a model but to adopt broadband functions of the exitation in the following form:…”

“…In the literature (Demić, 1990), (Demić, 1997a), (Demić, 1997b), (Demić, 2002), (Demić, 2013), (Simić, 1988), (Simić & Demić, 1992), (Bendat, 1998), (Igami et al, 2008), (Genta, 2003), (Shanguan et al, 2016) there are a number of mathematical-experimental methods for modeling the behavior of the powertrain. In this paper, a freight vehicle from the FAP 1314 production program, (whose scheme of the suspension of the powertrain is shown in Figure 1) was observed and the modeling process was applied based on the principles of classical mechanics (Atkins, 2010), (Pars, 1981).…”