Vibration data of buses
Vibration data of buses
(OP)
For ergonomic research concerning driving buses I'm looking for data about vibration transferred from the road to the bus (and further into the driver's seat). Can anybody provide any information (such as frequency range, accelerations)or direct me to any website containing the above.
Many thabks
Many thabks





RE: Vibration data of buses
Engine vibration will be submitted to the drivers seat though.
RE: Vibration data of buses
You might have a look at MIL-STD-810F for some vibration profiles. Also, ISO-2631.
TTFN
RE: Vibration data of buses
To IRstuff, I've looked into MIL-STD-810F (it is about consideration for laboratory tests)and found no figures; can you direct me.
Many thanks
RE: Vibration data of buses
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: Vibration data of buses
TTFN
RE: Vibration data of buses
Concerning that level of vibration, .6m/sec.^2, or .06 G:
what you'll find is that the other factor in seat-base vibration is the frequency.
For example, .06G acceleration at 20 Hz would be perceived as quite rough, quite a lot of vibration, while the same level of acceleration at 200 Hz would be considered quite smooth, an insignificant vibration level.
I'm basing this on my experience in heavy trucks, comparing test data to customers' perceptions, and also to a "vibration computer" sliderule furnished by Endevco.
As you might have guessed, wht people really notice is vibration velocity, not acceleration, and a good rule of thumb (or sliderule, in this case) is that the vibration velocity should not exceed about .15 inches per second.
This figure also agrees well with an internal standard that the Eaton Corporation use.
RE: Vibration data of buses
The one time i travel with a bus, my experiences are different..
RE: Vibration data of buses
And you wouldn't want an annoyed bus-driver, now would you?
RE: Vibration data of buses
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: Vibration data of buses
Your problem depends upon whether the suspension is spring, toralistic, air bag or something else.
And then if it is a pedestal seat, spring suspension seat, air suspension seat, with or without shock absorber or other.
As an Eagle bus driver, I did not know that road vibrations could be transmitted to the drivers seat, although I did once have to align the miter box to the engine to stop a vibration there caused by misalignment.
I have always wanted to put an air ride seat like the 18 wheelers have but never could justify the expense because the std seat (spring/shock) is so comfortable.
rmw
RE: Vibration data of buses
1. For your info. vibrations at 3 - 5 Hz are very harmful to humans' back (this is one of the main reasons for WBV-Whole body vibration which causes low-back disorders).
The acceleration figure I've mentioned before (o.6 m/sec.^2))refer to that frequency range.
2. Such vibrations are transferred from the road through the wheels and the suspension system to the chassis and to the driver's seat; inferior or malfunctioned vehicles' suspensions and/or seats suspension, transfer those vibrations.
3. Engine vibrations cause higher frequency vibrations which are of no interest to me.
4. IRStuff - many thanks for the directions you gave; anyhow the info within Method 514 wasn't helpfull.
5. Greg:
5.1 I don't have a handy Iso 2631 copy (this is the relevant standard);I'll have to check with a local liberary (maybe you know whether the relevant data is available on the web; f.o.c.).
5.2 What literature by Griffin (M. J. ??) do you mean and where is it available on the net (I've only found and reached titles of several articles but didn't reach the articles themseleves)
Regards
Arik
RE: Vibration data of buses
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.