Optimierung des passiven Fahrschwingungstilgers eines Radladers

Translated title of the contribution: Optimization of the passive ride suspension system of a wheel loader

Peter Steiner

Research output: ThesisDiploma Thesis

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Abstract

To meet the demands of a higher driving speed and an improved driver comfort it is necessary to keep vibrations which occur during the operation of a wheel loader as low as possible. Additionally the effect of a vibration minimization has a positive effect on fatigue life of the components. As wheel loaders have no chassis suspension, the tires and the passive ride suspension system are the only systems which can dampen these vibrations. The ride suspension system in which the boom with its bucket and payload is used as an absorber mass of the wheel loader, the hydro-pneumatic storage unit is the spring of the absorber and the damping is represented by the hydraulic resistance. This system can reduce both lift and pitch oscillations. Looking at security, the system will be tuned to the pitch oscillations in order to keep the wheel load variability as low as possible. In designing such a system one is faced with the challenge that the pitching frequency of the vehicle with increasing load is decreasing, while the natural frequency of the hydro-pneumatic suspension system shows a progressive course with increasing load. This results to the problem that when a predetermined, unchangeable capacity and a predetermined, unchangeable pressure of the storage unit is chosen the system could be only in one operating point optimally designed. The solution to this problem is the usage of a storage unit that is equipped with various types of storages, so to provide a diverse capacity and a different pressure. Through analytical considerations and a combined hydraulic and MBS simulation the system behaviour has been studied and a perfect adjustment of the storage unit has been found.
Translated title of the contributionOptimization of the passive ride suspension system of a wheel loader
Original languageGerman
QualificationDipl.-Ing.
Supervisors/Advisors
  • Eichlseder, Wilfried, Supervisor (internal)
Award date26 Mar 2010
Publication statusPublished - 2010

Bibliographical note

embargoed until 26-02-2013

Keywords

  • absorber hydro-pneumatic storage unit hydro-pneumatic suspension hydraulic simulation MBS simulation ride suspension system wheel loader

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