I am just starting my work on suspension of commercial vehicle.
I really dont know any book/reference to read from.I need to learn about leaf spring suspension and air suspensions modelling for ride.
Can you please guide me !!
I have no specific recommendations. I would start by looking in
mechanical engineering texts, particularly ones published by the SAE. I
would also not start with high hopes of getting a close model (you can
never get an exact model). If I did get a close model, I would have very
dim hopes of mathematical tractability.
Probably the most salient feature of a mathematical model of a physical
system, which people often forget, is that it is a simplified description
of what's going on. If you're modeling for behavior, then you won't
necessarily want to model for heating in the springs over a rough road.
Ditto, you wouldn't be interested (at least while analyzing behavior)
about where the stress risers are that may lead to premature cracking.
In fact, in a rational engineering design process, it's not uncommon to
have several different models for the same assembly -- I've been on one
product design effort where I would model the central assembly for
overall response to control inputs, someone would model that same
assembly for the amount of flexure under vibration (both for the purpose
of determining if it was rigid enough to do its job, and as input to my
behavioral efforts), someone would model the assembly for its thermal
characteristics, someone would model the thing for the amount of bearing
drag (which results I would use), and so on. A model that tried to put
that all together would have been insanely complex, and because of the
complexity, far less useful than the collection of individual models.
So -- what are your design goals, and how do you want the model to help
Most I have hired recently were front wheel drive.
So, why are we discussing this item in sci.engr.control? Is there not a more
appropriate group for this question? Are you developing an Active Suspension
System which requires electronic controls to operate?
I'm assuming you mean trucks (US name -- lorries in the UK, I think).
The ones I know of are almost all rear-wheel drive.
This is a question best answered by finding someone with immediate
practical experience -- like a truck driver -- and asking.
I guess in the USA you might call them panel vans. In the UK we call them
Vans or even Lutons (a slightly different style of van). They are based on
lighter chassis. The same vehicle bases also come as flat-bed trucks.
However, larger vehicles (HGV3 and HGV1 classes) will more than likely be
rear wheel drive.
Paul E. Bennett IEng MIET
Then I guess your category points are somewhat different to the UK. We can
get to the 3 tonne (HGV3) category before they get referred to as trucks at
which point it begins to require a commercial vehicle licence to drive. The
PSV licence starts out for lighter vehicles but that is based on the
"passenger carrying for commercial gain" aspect. Because of when I got my
licence to drive I am allowed to drive up to 7 tonne. Newer drivers have the
limit at 3 tonne.