NVH App

Fed · 31-08-2017, 10:42 AM

I came across this on youtube the other day and thought it would be a good thing until I saw the price, I'm sure it was $499 but now they are saying $399 with a special price of $99 so it's becoming much more interesting.
(Mods please delete this if it breaks any forum rules)

I'm hoping to find someone who has used this app to get some feedback on it.

The video: https://www.youtube.com/watch?v=GuI0hH2TuxQ

The so called special price: vibratesoftware.com/buy-the-nvh-for-android-app/

$99 doesn't go very far when you're chucking parts at a car.

**cs123** · 31-08-2017, 11:11 AM

ok, so I had a look at the video. They input the vehicle stats to work out rotational speeds of various components such as driveshaft, rear axle, wheels etc. Then the app looks for spikes at those frequencies or harmonics of those frequencies.

You could achieve the same by performing data collection using free scope software like visualiser or Winscope. Looking at the spectrum analyzer, identifying the frequencies related to the noise. Then create an Excel spreadsheet which calculates the frequencies of wheels, shafts etc and compare.

That is all that program is doing..

Sounds like it could be a fun experiment. You could also adapt a microphone to attach to the vehicle body and see how that works too.

Fed · 01-09-2017, 01:36 PM

I picked up a free app called, of all things, "Vibrations" which does frequency, rpm & intensity for sound & mechanical.
I'm hoping when my 80 KPH vibration kicks in it will flood the screen and I can hit the freeze screen button so I can check the vibration RPM later, the numbers are too small to see while testing.
https://play.google.com/store/apps/d....VibrationsAds
Simply being able to distinguish between tail shaft speed & wheel speed would be a bonus because I'm starting to second guess myself & refuse to throw parts at it.

Fed · 30-09-2017, 10:10 AM

Thought I'd put up a small update, so far I think I'm on a winner.
Knowing the speed, tyre size, diff ratio & overdrive ratio I've been able to eliminate the tailshaft.
Time to get down to some serious testing now and actually start writing some numbers down on paper.

Looks like I have 3 main vibrations but the steering wheel one is my main concern even though it is tiny it has become my white whale.

Vibration at engine speed, probably a mount.
Vibration at wheel speed, my white whale.
Vibration X, down in the 1-2 Hz area, possible exhaust hanger.

Anyway here's some pictures in no particular order or meaning other than to show the difference between the free app & the paid $3 app and to let you see where I'm at.
Pic 3 is me shaking the phone left/right, up/down, back/forwards just for fun.
Interesting to note gravity is included in the yellow line. (I think)