MegaSack DRAW - This year's winner is user - rgwb
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I am trying to find a reference source for the sprung frequency of different type of vehicles. I know these are only ball park figures and each vehicle is unique but I am struggling to find a decent reference source.
As an example passengers cars are typically 1-1.5Hz, Race Cars around 3Hz etc
If anyone knows a good text book on this (preferably available through the IMechE online library) it would be appreciated. I have spent hours searching texts but without luck.
I recall that the Race and Rally Car Source Book by Allan Staniforth has a short section on suspension frequencies along with some examples.
What are you trying to do?
Look into fatigue on a component that is transported by road. I have acceleration values but without a frequency (which will be pessimistic) it is difficult to look at the fatigue utilisation.
This might be completely irrelevant to what you are trying to do, but is it for changes to packaging for road transportation or something?
We used a company called Smithers PIRA last year to do some tests on a new packaging for some of our parts, as we were seeing breakages during shipments.
There are standard test cycles for different types of transport & they can do testing of packaged goods.
Bikes - same as your cadence 🙂
1 / (2*pi*(sqrt(springrate/mass)))
or something like that?
reckon it'll be tricky to calculate though, as what with 'tokens' etc. the springrate [s]often[/s] isn't constant...
As Crogthomas says, I'm pretty sure it's in the book by Allan Staniforth. I've got a copy at home so will look tonight.
Similar to what you describe Stumpy01. I really need some generic values for trucks. I think the fatigue load case is OK but just need somewhere to reference the frequencies from.
Well, the test we had done were carried out to ISTA 3E.
Some information here:
The vibration portion of it is done according to ASTM D 4728. You might be able to find more details of the specific vibrations required for the test by searching for that....?
Copies can be purchased online:
https://www.astm.org/Standards/D4728.htm
In that case I'd suggest ignoring references to 'spring frequency', which will almost always bring you to information on racing cars. Searching for information on 'ride quality' or 'IRI' would be more fruitful, but take care to separate the surface unevenness of a road from the actual movement of the vehicle.
Stumpy01 and Crogthomas - both udeful bits of information thank you. I seem to be narrowing my search and finding more pertinent information now.