The transient handling characteristics are becoming more and more important aspect in the recent development of vehicle dynamics performance. One of the reasons for it is that the handling performances that fall into feeling category have been getting increasingly important. Many of the feeling characteristics are more tightly related to transient characteristics than to steady state characteristics. A series of vehicle transient handling research has been performed, focusing attention on the force transmitted between tire and road. The study covered extensive area including theoretical field, simulation field and vehicle driving test measurement field. At the first step, the cause of vehicle instability at high speed with periodical steering input was studied making use of a simple 3DOF vehicle model, which reproduces dynamics of vehicle roll, which is thought to be one of the key issues of the vehicle transient handling study. The impact of roll motion upon transient handling was concisely explained theoretically and quantitatively with the approach to focus on the axle force and normalized side force. The impact of the roll stiffness and the roll damping ratio upon the above mentioned vehicle instability is quantitatively proved. The impact of the pitch angle of roll axis and principal axis of inertia upon the vehicle instability is quantitatively proved. The proposition that the front cornering stiffness does not impact upon the response gain of the rear axle normalized side force over that of front, which had been proved to be true for 2DOF single track model, was newly proved to be true also for 3DOF vehicle model that considers vehicle roll. A new 3DOF vehicle model concept, which is named SC (Separate Chassis) concept, was thought up and proposed, as well as the differential equation of it. An inexpensive, light-weight and less time consuming methodology to estimate the axle force, making use of IMU (Inertia Measuring Unit), which is commonly and widely used for modern vehicle dynamics testing, was proposed. The principle of the force estimation method is based on the estimation of the six components of the inertia force of the vehicle, calculated from six components of acceleration at the center of gravity of the test vehicle. Several force and moment terms are added for correction. The feasibility of the idea was then studied using MBS simulation to predict the error and accuracy, resulting in a positive conclusion. Finally, the practicability of the proposed force estimation method was validated, using a vehicle with a special setup that enables the simultaneous data logging for axle force measurement using measuring hub and for axle force estimation using IMU. The estimated result and the measured result were compared back to back and proving the practicability of the methodology. As a result of all the above, it is expected that the quantitative research on transient vehicle dynamics would become further easier, enabling the acceleration of research and development of transient vehicle dynamies.


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    Title :

    Transient handling analysis, focusing on axle side force


    Contributors:


    Publication date :

    2007


    Size :

    205 Seiten, Bilder, Tabellen, 32 Quellen



    Type of media :

    Theses


    Type of material :

    Print


    Language :

    English





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