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marksl

Sr. Member
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Posts: 155
Reply with quote  #1 
Hello,

I have an inquiry to monitor wire rope sheave bearings on a crane using on-line vibration analysis. The application is a challenge as we have very low speed, varying loads and a minimal run time which will make trending difficult. Has anyone had success using on-line system for similar applications with a complimenting technique such as monitoring displacement using proxy probes as well as standard vibration. I know monitoring displacement isn't going to help with internal bearing defects but I wonder if it will effectively determine looseness /wear when there is very little energy.
Dave Reynolds

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Posts: 53
Reply with quote  #2 
As you stated, hard to monitor, so more data would be better than none. Waites has vibration with temperature in a line powered system or a battery powered system, this should allow for data collection every minute, see attached case history, sends data to the cloud

https://www.uesystems.com/product/4cast/
ultrasound could be another option

With a system in place......try to convince client to run a "standard" test before every shift. Either loaded or unloaded, run up and run down, this should establish a consistent baseline vibration signature and amplitudes

Dave

 
Attached Files
pdf IIoT in Electric Power Generation_ Wireless Vibration on Slow Speed Co.pdf (1.91 MB, 20 views)

Walt Strong

Sr. Member
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Posts: 889
Reply with quote  #3 
Ultrasound (passive with contact sensor) would be a good alternative/complementary method for bearing faults. There are fewer choices for permanent ultrasound systems, especially if you need wireless. You really need to document machine details, operating details, results expectations, and measurement procedure before shopping for a measurement system. There are a lot of system architectures to consider for the application; such as hard wired to each sensor, wireless sensor, wireless modules with four or more sensors, and others.

Here are some suggestions:
https://www.bing.com/search?q=maars+crane+vibration+monitoring&form=EDGTCT&qs=PF&cvid=905b9e7f62fe4d90b206ed1f67f4aca1&refig=fce0036046724d9f810e1209d7bd4377&cc=US&setlang=en-US&elv=AXK1c4IvZoNqPoPnS%21QRLOMtL9g6rZVnKm7Aj2Fr*xz1FMaRBepWyfulFOPuQz6yidiW80RHQyqBcn6tqXxUkZxe47bp6NtSZCD6qSNyFx%21a&plvar=0

A MAARS system was developed for this purpose, but may be no longer available.

Walt
Shoveldr

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Posts: 89
Reply with quote  #4 

The challenge with cranes is that you have variable speed, variable direction and variable load.  You really need the ability to trigger based on speed and direction of rotation.  It's also important to understand the speeds of all the shafts and how much of a cycle time you have to collect data.

Testing out of production is sometimes the best option, but if you can put a transient or DAT recorder on the system you may be able to identify a window for data collection.  I've done a lot of work with mobile mining equipment which has similar issues.  See the attached, Vendor warning, the attachments are specific to the vendor I worked for at the time.

Rich 

 
Attached Files
pdf 2011_Emerson_Exchange_cyclic systems.pdf (1.05 MB, 20 views)
pdf Bridge Crane Monitoring Overview.pdf (24.65 KB, 19 views)

WWST

Sr. Member
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Posts: 86
Reply with quote  #5 
We now have a line powered tach/node with 5 sensors that can trigger based on rpm range to take data wirelessly. Works pretty well on cranes. One tach will provide speed reference for 100s of points (paper machine).
2Per

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Posts: 4
Reply with quote  #6 
https://www.cbmconnect.com/online-condition-monitoring-on-overhead-cranes/
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