Suspension Kinematics Programme
Ladda ner
Typ
Examensarbete för masterexamen
Program
Automotive engineering (MPAUT), MSc
Publicerad
2019
Författare
Yang, Xunbo
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
In the automotive industry, during the early design phase for the vehicle suspension
system, a design iteration between the suspension kinematics performance and packaging
requirements need to be performed. Hence, to increase the working efficiency,
a quick and robust design tool which can carry out basic kinematics simulation is
required. Comparing to the exsisted commercial software on the market in this area
(eg. MSC ADAMS/CAR), this tool will only covers selected suspension type and
pure kinematics simulation. Delivering the required suspension kinematics parameters
with easy and friendly user interface is the main goal.
This master thesis only focus on MacPherson suspension. First, it starts with finding
a suitable method for the modelling of the suspension mechanism system. Different
modelling methods are compared including planar modelling and spatial modelling,
relative coordinates system modelling and global coordinate system modelling. Constraint
equations are formulated based on the chosen modelling method. The nonlinear
equation solving problem was converted into an optimization problem to solve.
Slack variable method was applied here to provide more freedom to the solver. After
the equation system was solved, the data was post processed then given as required
output parameters.
After all the mathematical process are completed, the software implementation is
performed to realize all these functions in chosen software platform. First, a simple
MATLAB version is completed for early verification and back-up plan, then EXCEL
is chosen to be the final software platform due to its user friendly interface and widely
application. All functions are achieved by EXCEL Visual Basic Application (VBA,
EXCEL coding language) with EXCEL add-in Solver. A comparison between the
result from EXCEL and ADAMS/CAR was made at last to validate the accuracy
of the EXCEL program.
Beskrivning
Ämne/nyckelord
MacPherson suspension , Kinematics, Modelling , Excel VBA , Optimization , Simulation