So Ford Motor Company has this ability in the dealership level scan tool. You can place up to I believe 4 sensors at prescribed locations of the vehicle (also on engine, transmission, suspension etc..) and test drive it according to the directions of the scan tool. It will analyze the frequency and patterns and compare them to known patterns in the data base. It will then help you narrow down to the problem.
This is a great way to separate out vibration/shake sources. And in the grand scheme of things $15 is very reasonable. Plus using this app it should be easy to diagnose machinery with with different speed shafts and gears. Well done!
Good video . If we don’t know the final drive ratio , I suspect it can be calculated by dividing the engine rpm taken when the transmission is operating in direct ratio of 1:1and the lockup converter in an automatic transmission is locked up or as close to locked up on pwm converters by the tire rpm . Many front wheel drive cars the final drive ratio is difficult to impossible to find .
I base most of it on wheel RPM/frequency. We expect the axle ration to be between 3.5x and 4x that. My truck is a example of this. I ordered it from the factory 19 yrs ago. I was "sure" it had a 3:55 axle. I only found out it was actually a 3:31 in doing this video...lol
That 15 Hz - 16 Hz area gets excited real easy, even at 10 kph! So your idea of extra weight should help confirm it's body resonance. It should dampen it. Thanks for the input, Dave:)
Keep up this awesome work. I was thinking the other day, if you had a rattle under the dash, and used a sirometer to determine the frequency that the noise is occurring, could you use an audio frequency generator app dialed to that frequency, and the car speakers as the output? I'd like to use it to help isolate problems without needing to hold a loaded engine rpm while upsidedown under the dash. I work at a dealership, and suddenly I don't get any complaints like this to test it on! Maybe you already know the answer though?
you're on to something that I've been giving some thought to, Matt...am swamped with these 2 HS-ACC projects for a while but what you raise is worth pursuing and may actually tie in to the SINGLE HS-ACC implementation...
Another great diagnostic tool !! I wonder if it can diagnose an engine misfire ? Thinking of my diesel dodge. The engine is so undampened that it's hard to pick out when something new is going wrong.
Hi Mike! I have been following your tractor work a bit... As to your Dodge Cummins, it might be able to pick up a single cylinder misfire. It would show up @ 1/2 the engine RPM frequency...if it does.
Windshields are a structural member of the vehicle and the suction mount used here is pretty good. There's a new development by Martin Loren called HS-ACC that will provide 3-axis accelerometer that can be secured under the vehicle and transmit WiFi to phone. I'll be featuring this in near future. Thank You for watching Chris:)
there is a more PRO app that used to sell for $400 and now dropped to $99...called NVH still too rich for my blood but a few guys on our Telegram HScope Group sprang for it
@@theGADGETSplaylist Yes, I was watching videos on that app last night and emailed the inventor of it a few questions. That's a huge reduction in price. I'm considering it as well.
Very reasonable price for that app. Does it use the accelerometer built into the phone? A good phone mount or placement on a solid surface must be required. Now I have to check for an iPhone version. Thanks for the info.
Thank You I'll be playing with this NVH stuff over time using Martin's newly developed HS-ACC SINGLE which would allow us to place a WiFi accelerometer strategically on the vehicle and go for test drive using FFT as in this video...
Nicely done. Now...did you figure for the overdrive in the transmission and the vibration from both the gears and the clutches? You do have some harmonic resonance from such items. 😁
All embedded in that 15Hz to 20Hz range. Would be tough to unscramble from the rest. Would require an accelerometer stuck on the transmission itself connected to that HS101 PRO Bluetooth oscilloscope secured under vehicle. That would be a whole other video.
Very good. Video. I'll have to play with this. AGAIN. Denis is costing me money with all of his gadgets. I'm a sucker for gadgets :-) At least I don't have to build anything this time :-) Thanks for finding the app suited to this. What do you think you'd get on a front wheel drive vehicle being that most of the rotating stuff is inside the big block of mechanics under the hood?
Playing with it describes the process well... Concept remains the same for front wheel drive. We always start with wheel RPM. C/V joint would rotate at same frequency. If a problem, there would be a big spike there but can't tell us wheels or shaft, only that we're looking in the right direction. Driving in different gears (if we know the ratios) could also be telling of "the rotating stuff inside" It's a tool that requires a bit of hands on and thinking cap on.
@@theGADGETSplaylist Very awesome video! - Wouldn't belt-line accessories like the alternator, power steering pump, A/C compressor etc. be turning at different RPM's than the engine, some slower (larger pulleys) some the same or faster (smaller pulleys) - wouldn't that noise show up on here? Also since this is a ford vehicle, you should be able to get up to speed and put the truck in neutral and turn the ignition key off, shutting the engine off and eliminating that source of noise from the readings giving you only body/chassis/wheel/hub/road noises. Then you could re-crank while rolling down the road in neutral and drop it into gear.
@@tomhorne3674 I appreciate the thought and interaction. I did experiment with putting vehicle in neutral (but engine still running). Doesn't seem to change much. There's an inverse to this idea. Have vehicle stopped and race engine. Nothing. We confirmed that at 1400 RPM (23.3Hz) there was no engine vibration to be seen. As to the accessories on the serpentine, I doubt they wound contribute in a test like this. Best would be GADGETS#77 method. Thanks for all the support, Tom:)
So Ford Motor Company has this ability in the dealership level scan tool. You can place up to I believe 4 sensors at prescribed locations of the vehicle (also on engine, transmission, suspension etc..) and test drive it according to the directions of the scan tool. It will analyze the frequency and patterns and compare them to known patterns in the data base. It will then help you narrow down to the problem.
Good to know and thanks for sharing, Josh.
This would be out of the hands and means of DIY mechanics and many professional mechanics for that matter.
Fantastic video on NVH Diagnosis. Very creative way to diagnose without microphones all over the vehicle.
am pleased you liked it:)
Very nice Denis and totally affordable. This would be extremely interesting to try out! Thanks for getting it out there and all the tips!
hang phone upside down, should work in your neck of the woods Rome🤣🤣🤣
This is a great way to separate out vibration/shake sources. And in the grand scheme of things $15 is very reasonable. Plus using this app it should be easy to diagnose machinery with with different speed shafts and gears. Well done!
yes Al, I think myFREQUENCY app is targeted at stationary machinery.
Thanks for the comment:)
Good video . If we don’t know the final drive ratio , I suspect it can be calculated by dividing the engine rpm taken when the transmission is operating in direct ratio of 1:1and the lockup converter in an automatic transmission is locked up or as close to locked up on pwm converters by the tire rpm . Many front wheel drive cars the final drive ratio is difficult to impossible to find .
I base most of it on wheel RPM/frequency. We expect the axle ration to be between 3.5x and 4x that.
My truck is a example of this. I ordered it from the factory 19 yrs ago. I was "sure" it had a 3:55 axle. I only found out it was actually a 3:31 in doing this video...lol
Awesome video Denis, too bad I don't have the bent driveshaft on the motorhome anymore. This would have saved me years figuring out the vibration. :)
Thanks Chris.
Hang tight for TEDDY next week!
Very interesting, I wonder if the 16.09 resonance would change with extra weight in the bed. There might be a sweet spot with very little v.
That 15 Hz - 16 Hz area gets excited real easy, even at 10 kph!
So your idea of extra weight should help confirm it's body resonance. It should dampen it.
Thanks for the input, Dave:)
Keep up this awesome work. I was thinking the other day, if you had a rattle under the dash, and used a sirometer to determine the frequency that the noise is occurring, could you use an audio frequency generator app dialed to that frequency, and the car speakers as the output? I'd like to use it to help isolate problems without needing to hold a loaded engine rpm while upsidedown under the dash.
I work at a dealership, and suddenly I don't get any complaints like this to test it on! Maybe you already know the answer though?
you're on to something that I've been giving some thought to, Matt...am swamped with these 2 HS-ACC projects for a while but what you raise is worth pursuing and may actually tie in to the SINGLE HS-ACC implementation...
Another great diagnostic tool !! I wonder if it can diagnose an engine misfire ? Thinking of my diesel dodge. The engine is so undampened that it's hard to pick out when something new is going wrong.
Hi Mike! I have been following your tractor work a bit...
As to your Dodge Cummins, it might be able to pick up a single cylinder misfire. It would show up @ 1/2 the engine RPM frequency...if it does.
Thank you for posting this! Curious if you feel the phone mount would have any dampening effects as it is not a hard mount to vehicle body?
Windshields are a structural member of the vehicle and the suction mount used here is pretty good.
There's a new development by Martin Loren called HS-ACC that will provide 3-axis accelerometer that can be secured under the vehicle and transmit WiFi to phone. I'll be featuring this in near future.
Thank You for watching Chris:)
Good video. I'll be trying this app out. Thank you
there is a more PRO app that used to sell for $400 and now dropped to $99...called NVH
still too rich for my blood but a few guys on our Telegram HScope Group sprang for it
@@theGADGETSplaylist Yes, I was watching videos on that app last night and emailed the inventor of it a few questions. That's a huge reduction in price. I'm considering it as well.
@@TwinTurboRamAir if you like, join us on Telegram and those guys will be happy to share their experience with NVH app...
t.me/hscope
Denis
Clever idea! Vibrations are really annoying.
Thanks!
Very reasonable price for that app. Does it use the accelerometer built into the phone? A good phone mount or placement on a solid surface must be required. Now I have to check for an iPhone version. Thanks for the info.
Yes, the app uses the smartphone's accelerometer. Poor you stuck with an iPhone:)
Let me know how you make out with this Chad...
the GADGETS playlist crap! I have an iPhone too! Haha
Voltage Drop Diagnostics lol I just spent the last 20 minutes looking for an iPhone app. There is a 2 star app for $400.
I should probably just pickup a used Samsung just for android only apps
@@ThePracticalMechanic why I'm an ANDROID guy, Chad:)
Amazing ... Very good my friend ✌️👍
Thank You
I'll be playing with this NVH stuff over time using Martin's newly developed HS-ACC SINGLE which would allow us to place a WiFi accelerometer strategically on the vehicle and go for test drive using FFT as in this video...
Always interesting Denis...Cheers Pal
thx, Ian
Nicely done. Now...did you figure for the overdrive in the transmission and the vibration from both the gears and the clutches? You do have some harmonic resonance from such items. 😁
All embedded in that 15Hz to 20Hz range. Would be tough to unscramble from the rest.
Would require an accelerometer stuck on the transmission itself connected to that HS101 PRO Bluetooth oscilloscope secured under vehicle.
That would be a whole other video.
@@theGADGETSplaylist Down the rabbit hole we go. 😃
@@rs1971camaro yep, I think this will be right up Rick's alley:)
Very good. Video. I'll have to play with this.
AGAIN. Denis is costing me money with all of his gadgets. I'm a sucker for gadgets :-)
At least I don't have to build anything this time :-)
Thanks for finding the app suited to this.
What do you think you'd get on a front wheel drive vehicle being that most of the rotating stuff is inside the big block of mechanics under the hood?
Playing with it describes the process well...
Concept remains the same for front wheel drive. We always start with wheel RPM. C/V joint would rotate at same frequency. If a problem, there would be a big spike there but can't tell us wheels or shaft, only that we're looking in the right direction.
Driving in different gears (if we know the ratios) could also be telling of "the rotating stuff inside"
It's a tool that requires a bit of hands on and thinking cap on.
cool
it is, Dan
thanks for dropping by:)
@@theGADGETSplaylist Very awesome video! - Wouldn't belt-line accessories like the alternator, power steering pump, A/C compressor etc. be turning at different RPM's than the engine, some slower (larger pulleys) some the same or faster (smaller pulleys) - wouldn't that noise show up on here? Also since this is a ford vehicle, you should be able to get up to speed and put the truck in neutral and turn the ignition key off, shutting the engine off and eliminating that source of noise from the readings giving you only body/chassis/wheel/hub/road noises. Then you could re-crank while rolling down the road in neutral and drop it into gear.
As always, Great Video Denis!
@@tomhorne3674 I appreciate the thought and interaction. I did experiment with putting vehicle in neutral (but engine still running). Doesn't seem to change much.
There's an inverse to this idea. Have vehicle stopped and race engine. Nothing.
We confirmed that at 1400 RPM (23.3Hz) there was no engine vibration to be seen.
As to the accessories on the serpentine, I doubt they wound contribute in a test like this. Best would be GADGETS#77 method.
Thanks for all the support, Tom:)