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Jonson, O. och Enders, E. (2016) Correlation Work on Shaker Rig Tests and Simulations - An investigation of damper, bushing, friction and tire modeling with respect to vertical vibration insulation. Göteborg : Chalmers University of Technology (Diploma work - Department of Applied Mechanics, Chalmers University of Technology, Göteborg, Sweden, nr: 2016:01).
BibTeX
@mastersthesis{
Jonson2016,
author={Jonson, Oskar and Enders, Erik},
title={Correlation Work on Shaker Rig Tests and Simulations - An investigation of damper, bushing, friction and tire modeling with respect to vertical vibration insulation},
abstract={In the Automotive Industry it becomes more and more important to reduce costs and cut down development
time. It is one of the main challenges in order to stay competitive, also for the Volvo Car Cooperation, where
this thesis work was carried out in cooperation with Chalmers University of Technology. With regard to Vehicle
Dynamics, a large amount of the cost is generated while prototype cars need to be set-up and changed to
meet requirements during the testing phase. With the increase in computational power and the availability of
advanced software for vehicle dynamics simulations in recent years, it is now possible to do some of this work
earlier in the design phase. The future goal is to use prototype testing mainly for validation of having met the
requirements, rather than changing the car to achieve them. For this to be possible, it needs to be assured that
the CAE methods are stable and show good correlation to physical testing. This thesis focuses on correlation of
vertical vibration insulation simulations. The starting point was that shaker rig tests showed different results
from shaker rig simulations in Adams Car. A thorough pre-study was performed to understand the theory of
key areas for vertical vehicle dynamics, such as damper, bushing, tire and friction modeling. The technical
background section of this work should therefore provide all the needed information to understand the carried
out work, also for a reader new to this field. As a next step, simulation models are developed ranging from
linear quarter car state-space models in MATLAB to more advanced non-linear quarter car models in Dymola.
The most advanced Dymola model features a self-developed low-pass filter damper model, hydro engine mount
and top mount bushings as well as different friction implementations. Friction modeling was also investigated
with a full car model in Adams Car. Shaker rig, damper and suspension parameter measurement machine
tests where conducted, to parametrize models and gain more insight into the physical phenomenas that are
tried to be replicated. Friction was identified as the largest factor why simulations and tests do not correlate.
The implementation of friction improved results significantly, especially at low frequencies. More accurate
damper modeling that tries to capture the hysteresis loop in the Force-Velocity Diagram due to compressibility,
cavitation and backlash, seems to have a smaller influence on shaker rig simulation correlation, especially in
the low frequency range (0 3 Hz). It could be verified that accurate bushing and tire modeling is needed to
obtain good correlation at higher frequencies (3 20 Hz). Convergence of simulations was found as a main issue
for models that included friction. Validation of bushing and tire modeling, as well as accurate parametrization
of friction and improved solve-ability of models with friction remain as future tasks.},
publisher={Institutionen för tillämpad mekanik, Fordonsteknik och autonoma system, Chalmers tekniska högskola},
place={Göteborg},
year={2016},
series={Diploma work - Department of Applied Mechanics, Chalmers University of Technology, Göteborg, Sweden, no: 2016:01},
keywords={Vertical Vehicle Dynamics, Damper Modeling, Damper Testing, Bushing Modeling, Friction Modeling, Tire Modeling, Correlation, 4-Post Shaker Rig, SPMM, Vibration Insulation, Suspension, Eigenfrequency, Transmissibility, MATLAB, Dymola, Adams},
}
RefWorks
RT Generic
SR Electronic
ID 239095
A1 Jonson, Oskar
A1 Enders, Erik
T1 Correlation Work on Shaker Rig Tests and Simulations - An investigation of damper, bushing, friction and tire modeling with respect to vertical vibration insulation
YR 2016
AB In the Automotive Industry it becomes more and more important to reduce costs and cut down development
time. It is one of the main challenges in order to stay competitive, also for the Volvo Car Cooperation, where
this thesis work was carried out in cooperation with Chalmers University of Technology. With regard to Vehicle
Dynamics, a large amount of the cost is generated while prototype cars need to be set-up and changed to
meet requirements during the testing phase. With the increase in computational power and the availability of
advanced software for vehicle dynamics simulations in recent years, it is now possible to do some of this work
earlier in the design phase. The future goal is to use prototype testing mainly for validation of having met the
requirements, rather than changing the car to achieve them. For this to be possible, it needs to be assured that
the CAE methods are stable and show good correlation to physical testing. This thesis focuses on correlation of
vertical vibration insulation simulations. The starting point was that shaker rig tests showed different results
from shaker rig simulations in Adams Car. A thorough pre-study was performed to understand the theory of
key areas for vertical vehicle dynamics, such as damper, bushing, tire and friction modeling. The technical
background section of this work should therefore provide all the needed information to understand the carried
out work, also for a reader new to this field. As a next step, simulation models are developed ranging from
linear quarter car state-space models in MATLAB to more advanced non-linear quarter car models in Dymola.
The most advanced Dymola model features a self-developed low-pass filter damper model, hydro engine mount
and top mount bushings as well as different friction implementations. Friction modeling was also investigated
with a full car model in Adams Car. Shaker rig, damper and suspension parameter measurement machine
tests where conducted, to parametrize models and gain more insight into the physical phenomenas that are
tried to be replicated. Friction was identified as the largest factor why simulations and tests do not correlate.
The implementation of friction improved results significantly, especially at low frequencies. More accurate
damper modeling that tries to capture the hysteresis loop in the Force-Velocity Diagram due to compressibility,
cavitation and backlash, seems to have a smaller influence on shaker rig simulation correlation, especially in
the low frequency range (0 3 Hz). It could be verified that accurate bushing and tire modeling is needed to
obtain good correlation at higher frequencies (3 20 Hz). Convergence of simulations was found as a main issue
for models that included friction. Validation of bushing and tire modeling, as well as accurate parametrization
of friction and improved solve-ability of models with friction remain as future tasks.
PB Institutionen för tillämpad mekanik, Fordonsteknik och autonoma system, Chalmers tekniska högskola,PB Institutionen för tillämpad mekanik, Fordonsteknik och autonoma system, Chalmers tekniska högskola,
T3 Diploma work - Department of Applied Mechanics, Chalmers University of Technology, Göteborg, Sweden, no: 2016:01
LA eng
LK http://publications.lib.chalmers.se/records/fulltext/239095/239095.pdf
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