NVH App
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This is a copy and paste of the review I left at the Playstore:
This app is great! In addition to the function of the app, it contains a WEALTH of information on NVH. The first few times I used it, I didn't really need NVH to diagnose the problem, but the app was spot-on with my conclusions. Faith in the app had been initiated. Today, I replaced the center support bearing on a two-piece drive shaft. I determined the customers complaint to be the bearing and the app agreed with my diagnosis...a 1st Order Driveshaft vibration. I had my mechanic replace the bearing and the U-joints. After the replacements, I went for a test drive and, indeed, the bearing "growl" was gone. But, now, I noticed what I thought was tire/road noise/vibration. The NVH App disagreed with me. The app diagnosis was a 2nd Order Driveshaft vibration. I went back to the shop and asked my mechanic if he marked the driveshaft pieces for re-assembly. He said that he did, but admitted that in his haste, it was not re-assemble with the marks matching. He corrected the alignment of the two-piece shaft and the 2nd Order Driveshaft vibration went away! This app has proven itself, to me! If you are considering an NVH solution, this app is the REAL DEAL!
play.google.com/store/apps/details?id=vi...tware.jacobkelly.nvh
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- Matts Auto
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The BT1A has been validated, by the makers of the app, to work. gopointtech.com/product/bt1a-for-apple-android/
It's, currently, out of stock.
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- Andy.MacFadyen
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Bosch have a free NVH app for Android but that won't analyse the results so you would need a bit of vibration engineer knowledge.
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- Andy.MacFadyen
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Andy.MacFadyen wrote: I was looking back over the the Bosch iNVH app to see if it had been improved when I found this
I'll have to check that one out and post a comparison. My guess is the price difference would be, mainly, justified by the EXTRAS that the NVH app has.
i.e. it has a data base of gear ratios that you can look up based on manufacturer RPO codes, and much more. I'm curious how much the "Shimmy Diagnoser" gives you.
I'll check it out and post back.
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In a nut-shell,
It determines what KIND of vibration you have, based on the vibration frequency. A wheel-speed vibration will have a different frequency than a drive-shaft vibration. You must enter data values for Tire size, # of cylinders, and gear ratios. A First Order wheel-speed vibration will have 1 vibration per revolution. (First order means 1 shake per revolution. 2nd order means 2 shakes per revolution. 3rd order...3 shakes per revolution, etc). The frequency of the vibration will match the frequency of the wheel turning. A driveshaft vibration will have a different frequency.
A wheel speed vibration can be ANYTHING that is turning the same speed as the wheels...tire, rim, rotor, wheel bearing, axle...Same with Drive-shaft, and engine vibrations.
Tire, Drive-shaft, and Engine are the 3 different groups of vibration.
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Chad wrote: I'm curious how much the "Shimmy Diagnoser" gives you.
I'll check it out and post back.
I just installed the Shimmy Diagnoser. After opening the app, the first step is to enter gear ratios.....I don't know the gear ratios. You will NEED an outside information source, and have to look up, and enter, the gear ratios.
With the NVH App, you can select Year, Make, and Model and the gear ratios will be entered for you, on newer cars (15 years +/-, with more models to come).
For vehicles that are older, the app has a data base of RPO (Regular Production Option) codes and gear ratios.....the information is there and given to you, but you have to manually enter it into the app.
I'll post back, later, on a performance comparison.
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I would recommend it to anyone that understands that it is a tool, not a silver bullet identifier.
Even though I am happy with this app and I think it is "mostly" adequate, I will still end up buying the Pico NVH kit, as well. I want to be able to move a magnetic mounted sensor around...stick it to different things and look at amplitude changes. You are kind of limited, in this area, with the app.
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- dfends@hotmail.com
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I have the nvh for the pico scope and i have used other tools but with my experience i the nvh on the pico is a awesome tool worth every penny and it paid for itself quite quickly .
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Like Chat said, a first order vibration occurs once per revolution and a second would be twice, like a 4 cylinder engine having 2 firing events per revolution. 6 cylinder having 3.
We used this method to determine that a rotor had excessive lateral runout, an engine mount bolt was contacting the frame, and a driveshaft was missing a bolt. The "problems" were rather obvious, but the point was that being lead in the right direction was very clear based on the math.
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