This page is separate
from the Vehicle Testing
section because it is a particular kind of
vehicle performance test that is not an elementary test or a simple
measure of one only parameter but it is the measure of different
parameters that have to be correlated each other in order to calculate
suitable indicators to achieve the fingers of vehicle
behaviour.
Several publications and technical articles are available
about this subject, with different approaches, from elementary to
complex and articulate , frequently Math models are
so
complicate to be hard applying to Testing
environment. My personal contact with the
subject was
when i had to distinguish the amount of tyre behaviour from the entire
Vehicle performance. After freezing the test conditions (vehicle,
vehicle setup, path, speed in the different sectors,..) i started to
measure the three fundamental angles, Pitch,
Roll e
Yaw, and to calculate they related gradients (first and second) to
achieve the angular speed and the angular acceleration and the
accelerations on the x,y,z axis, then i calculated the energy
content by RMS; the result was fair but in some case it was
inconsistent, thus i realized two things:- i had to correlate more
variables to define "suitable fingers",- i had to take in account
the parameters that determine a certain behaviour (ie it is
not
enough to measure Roll angle, the best should be to normalize the angle
value with lateral acceleration (measured or calculated by vehicle
speed and steering angle, or both..)
Angles & Accelerations_1 |
Angles & Accelerations_2 |
I_Best_Driver |
Even if the work is not complete, currently several fingers are available, and for sure the Testing Methodology is strong, reliable and suitable for different testing areas: on road and off road, components/parts of the vehicle or entire vehicle.
Something Different 3D1 |
Something Different 3D2 |
All information combined together!
At last I would like to introduce a complementary (with the previous one) testing metodology / instrumentation that allows to records and analyse all kinds of information available while testing dynamically the vehicle:
- DATA from whatever sensor (Analog, Can Bus, Frequency,...) in order to measure, quantify , calculate and assess
- VIDEOS coming from cameras in order to see and make easy the understanding of the previous measure (frequently we measure something but sometimes it is hard to realize the reason)
- POSITION from GPS in order to understand where a certain event occurs and what sector of the track is critical
Short video to understand the test condition |
Demo for Tyres... Parts... and Vehicle |