Article 13115

Title of the article

SELECTION OF OPTIMALITY CRITERION OF VEHICLE TORSIONAL SUSPENSION 

Authors

D'yakov Ivan Fedorovich, Doctor of engineering sciences, professor, head of sub-department of machine design fundamentals, Ulyanovsk State Technical University (32 Severny Venets street, Ulyanovsk, Russia), i.dyakov@ulstu.ru

Index UDK

629.113

Abstract

Background. The research object is the selection of the optimality criterion at the design of vehicles with torsional suspension. The research subject is the torsional suspension of a vehicle. The aim of this research is to provide smooth motion of the sprung mass during the motion on the rough road by means of selection of stiffness characteristics of the suspension, which affect the coefficient of human sensation intensity.
Materials and methods. The research on motion smoothness of vehicles was based on the theory the springing of vehicles using the penalty function of the optimization theory.
Results. The author represented sprung and non-sprung masses in the form of separate masses, determined their kinetic and potential masses, made a 17x17 mass motion matraix using the Lagrange equation of II kind. By fixing the oscillatory frequency from 0 till 20 Hz for every mass and expressing their real and imaginary arguments the researcher obtained the amplitude-phase-frequency characteristic (APFC), and using the latter the transient response plot and damping time of the sprung mass were determined.
Conclusions. 1. The comparison of different criteria of optimality of suspension allowed to conclude that in order to provide travelling comfort the oscillatory frequency shall tend to be 60 min-1. If the static load on the spring is known, the stiffness of suspension will be easy to determine. Dynamic suspension deflection (till the "bump stop" position under the disruption) may be calculated with consideration of empirical relationship and shall not be more than (0,8…1,0) c where с is the static suspension deflection for trucks. 2. Torsional suspension has several advantages in comparison with the leaf spring: torsions with equal energy requirement have less weight; another advantage of the torsions is more ways for suspension designing, especially at designing driving axels of trucks.

Key words

torsional suspension, frequency response characteristics, motion smoothness, optimalilty criterion, vibration protection coefficient, damping coefficient.

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References

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Дата создания: 30.06.2015 13:27
Дата обновления: 03.07.2015 15:03