E... Cant find your post but i talked to one of the higher up's in the food chain... Who just got back from the tram code fest in Cali.. My thoughts do have ground still interested?
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cable tach loss
Started by spark's, May 10 2007 01:34 PM
2 replies to this topic
#2
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Posted 10 May 2007 - 01:49 PM
spark, on May 10 2007, 03:34 PM, said:
E... Cant find your post but i talked to one of the higher up's in the food chain... Who just got back from the tram code fest in Cali.. My thoughts do have ground still interested?
If you're referring to "non-contact speed sensing" - the moderators moved it to the other side of the fence. Sure I'm interested in your thoughts.
There are three roads to ruin; women, gambling and technicians. The most pleasant is with women, the quickest is with gambling, but the surest is with technicians. Georges Pompidou
#3
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Posted 11 May 2007 - 06:28 AM
QUOTE(FSJ @ May 10 2007, 10:37 PM)
We had a discussion at work about this a couple months ago.
One of the guys at Riblet was measuring the speed of the rope using the rope lay. I believe he was using a gear tooth magnetic pickup. The did some testing at Mt Spokane. It was before I worked there. I remember looking at the file, alas, I no longer have access to it. The sensor can't have too great a sensing distance since the rope diameter doesn't change much. Keeping the proper sensorr distance and avoiding the tuck would be the tricky part.
I have driven an encoder using a measuring wheel against the groove a guide sheave. The rope keeps the groove clean and the liner wear doesn't matter. I use a modified snowmobile idler wheel. They will go at least 5k miles at about 45 mph under a lot more load without wearing out.
Copied from "non-contact speed sensing", industry section.
I do this as well for the "performance monitor" (overspeed, overaccel, direction) - and it does work. For these functions, dead-nuts accuracy in distance measurement isn't important. I hadn't thought about using the snowmobile idler wheel though. The problem is with the environment that the encoder is required to live in. Sooner or later, there is an icing or other mechanical difficulty.
The "vision" that got me going on this came after reading through the specs on a doppler device used in motorcycle testing. Mounted to the frame of the bike - some 16" off the ground - it yields accurate distance and rate information... right out there in the mud and the crud on a motocross circuit. It is completely surface-indifferent. Such a device could gather information from any moving surface - at a respectable distance. It could be mounted through the bottom of the control cabinet (i.e. the machine room floor) and look right at the rope - keeping the expensive stuff in a friendly environment while observing the action of the very element of the system we are most concerned with.
Maybe it "just ain't worth it" - but it sure seems like a nice idea.
We had a discussion at work about this a couple months ago.
One of the guys at Riblet was measuring the speed of the rope using the rope lay. I believe he was using a gear tooth magnetic pickup. The did some testing at Mt Spokane. It was before I worked there. I remember looking at the file, alas, I no longer have access to it. The sensor can't have too great a sensing distance since the rope diameter doesn't change much. Keeping the proper sensorr distance and avoiding the tuck would be the tricky part.
I have driven an encoder using a measuring wheel against the groove a guide sheave. The rope keeps the groove clean and the liner wear doesn't matter. I use a modified snowmobile idler wheel. They will go at least 5k miles at about 45 mph under a lot more load without wearing out.
Copied from "non-contact speed sensing", industry section.
I do this as well for the "performance monitor" (overspeed, overaccel, direction) - and it does work. For these functions, dead-nuts accuracy in distance measurement isn't important. I hadn't thought about using the snowmobile idler wheel though. The problem is with the environment that the encoder is required to live in. Sooner or later, there is an icing or other mechanical difficulty.
The "vision" that got me going on this came after reading through the specs on a doppler device used in motorcycle testing. Mounted to the frame of the bike - some 16" off the ground - it yields accurate distance and rate information... right out there in the mud and the crud on a motocross circuit. It is completely surface-indifferent. Such a device could gather information from any moving surface - at a respectable distance. It could be mounted through the bottom of the control cabinet (i.e. the machine room floor) and look right at the rope - keeping the expensive stuff in a friendly environment while observing the action of the very element of the system we are most concerned with.
Maybe it "just ain't worth it" - but it sure seems like a nice idea.
There are three roads to ruin; women, gambling and technicians. The most pleasant is with women, the quickest is with gambling, but the surest is with technicians. Georges Pompidou
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