How Loud is Too Loud? (Cal Games)

[eugenebrooks]

On a serious note, refer to the table linked to below.
http://www.occupationalhearingloss.c...aring_loss.htm

Under OSHA rules, no exposure above 115 dBA is allowed, however short.

So, this answers the question: How Loud is Too Loud?
If you have concerns, borrow or buy a sound level meter.

Yes, there will be a sound meter available at the Cal Games...

Eugene
(President of the WRRF)

[=Martin=Taylor=]

Originally Posted by eugenebrooks

On a serious note, refer to the table linked to below.
http://www.occupationalhearingloss.c...aring_loss.htm

Under OSHA rules, no exposure above 115 dBA is allowed, however short.

So, this answers the question: How Loud is Too Loud?
If you have concerns, borrow or buy a sound level meter.

Yes, there will be a sound meter available at the Cal Games...

Eugene
(President of the WRRF)

Thanks that's really helpful. I would say our robot measures somewhere around the 90 level

Although we haven't found a solution to the problem (a five day solution that is ) we have managed to adjust our shooter so that we only have to reach "jackhammer speed" for a very short time.

As for metal fatigue it has surprisingly held together quite nicely and there are no visible signs of damage.

[eugenebrooks]

Originally Posted by Hachiban VIII

Thanks that's really helpful. I would say our robot measures somewhere around the 90 level

Although we haven't found a solution to the problem (a five day solution that is ) we have managed to adjust our shooter so that we only have to reach "jackhammer speed" for a very short time.

As for metal fatigue it has surprisingly held together quite nicely and there are no visible signs of damage.

Only 90 dbA?, you can run that all day and we will call it entertainment!


Eugene

[KenWittlief]

Originally Posted by Hachiban VIII

...Although we haven't found a solution to the problem (a five day solution that is ) we have managed to adjust our shooter so that we only have to reach "jackhammer speed" for a very short time.

As for metal fatigue it has surprisingly held together quite nicely and there are no visible signs of damage.

If you think the problem is your shooter is out of balance it should be relatively easy to eyeball the system and see where it is not symetrical about the center of rotation

and to guesstimate the amount of weight you would have to add to the other side to balance it - like they do with the lead weights on car tires.

regarding metal fatigue, I dont think you will see any visable signs until something breaks. After a part has failed an experienced M.E. can look at the break and tell why it failed (crystalized, sheared, cut...)

[Al Skierkiewicz]

Originally Posted by eugenebrooks

On a serious note, refer to the table linked to below.
http://www.occupationalhearingloss.c...aring_loss.htm

Under OSHA rules, no exposure above 115 dBA is allowed, however short.

So, this answers the question: How Loud is Too Loud?
If you have concerns, borrow or buy a sound level meter.

Yes, there will be a sound meter available at the Cal Games...

Eugene
(President of the WRRF)

This is a good explanation but adding to this, the "A" scale is a frequency dependent curve that tries to approximate the inverse of human hearing sensitivity. As such it is less sensitive to areas where the human hearing is less sensitive. However, the offending noise is still there.
Many venues and outdoor arenas are now instituting noise level ceilings on performances. 110 dBA seems to be the defacto standard but the measurement is still an issue. Sounds decrease by the inverse square law with distance. So the issue is where do you measure the sound level. In arenas, it is acceptable to take an average of the seating area but any seat that exceeds the standard should be corrected by some means to come into compliance. Outdoor venues have to comply with neighborhood standards such that sound levels at the closest house must stay within local ordinance for the time of day. (local sound level ordinances vary between daytime and nighttime.) With a standard FRC playing field the drivers have less exposure than the judges and field people.