Automotive Vibration Analyzers - Part 1 of 5

Weber State University (WSU) - Automotive Technology Department - Transmission Lab. This is the first of a five-part series on automotive Noise, Vibration, and Harshness (NVH) analyzers. In this episode, six different analyzers are introduced. Additionally, a demonstration of the Frahm Resonant Reed Tachometer and the Tresit Sirometer is shown as well as a discussion of the advantages and disadvantages of each.

[billanderson]

I still have a lot of respect for the reed tachometer! John, I always love your videos! Thank you!!!

[bbstacker]

Thank you for this video. I watched about 8 really bad videos on this sirometer, and you are the only only to explain what I was to be looking for from the spring when the correct rpm I was looking was reached. Thank you again.

[TheJKJunkie]

Just found one of the resonant reed style ones in an abandoned industrial building on our facilities property that was scheduled for demo, glad i scooped it up before it got crushed, the one i found is the same brand as the one you show in the video however the indication is in RPM, it reads up to 75 x 100 rpm

[billanderson]

I have the most experience with the Sirometer. However it does require developing a skill. But when you get it, you get it. It's cheap, and very accurate. Once you've dialed in the correct vibration. The wire will appear orbital.

[johncollins]

Thanks for reminder on the Briggs. Haven't used mine for some years (on garden equipment) and thought it was broken/ indeed of maintenance/ oiling. Nope, it was me that was indeed of oiling, so thanks for that!

[rotorblade]

the mechanical fourier transform is so cool 😝
I’m trying to do some measurements on a car flywheel and I’ve built a piezoelectric sensor and I wired a tachometer to send bot signals to an portable oscilloscope. The oscilloscope works pretty well with 2 channel input. This one was like $600 but there are even cheaper ones available. Btw it has a FT function but it’s kind of slow. Your mechanial analog one seems to give you pretty crisp readings 👍 even the syometer is ingenious:)

[darrenherring]

You do such a great job sir. So informative. Thanks. Who makes the reed tachometer?

[daleslover]

The German design wire vibration analyzer is worth its weight in gold, , I use my extensively working in a small engine repair, , many time a customer will talk about a high vibration, , it cannot be easily diagnosed because of the moving parts, , I used it Many Times doing tune ups on engines on vehicles, , a little tricky at first, , , playing with them, , , when and where and how too place them, , had a customer one time complain about a vibration at 40 to 45 miles an hour (Truck) then it seemed to smooth it self out, , by process of elimination, attaching a water hose clamp to a Driveline, , rotating it every 1/2 of an inch we discovered she had a bent Driveline, , then she told me she replace her U-joints several times, I told her that was pertinent information that could save me a lot of time.🤤

[AdvTechTS]

Hi John, great stuff!
If you have a tire with two high spots at 90 degrees apart, would this cause a second order vibration or two first order vibrations at a different phasing?

[knighthawk]

Thank you very much for this video, very informative.

[adityasingh-dcqp]

As always really grt demonstration, .. thank u sir

[robertobendezu]

Thank you for your instructing video! I really appreciate it!

[sinicodaniel]

It's an interesting topic!
Thank you teacher!

[sjakan]

Hi Professor Kelly, I try to find the relation in between dBg that are the scale for a Toyota NVH tool, compared to mg that e.g. Pico uses? Are you able to provide any information on that? Thanks in advance! Br. Sjakan

[grigorgeorgiev]

Extremely helpful, thank you very much!

[johncollins]

The "Briggs" thing is 15:50 mins in.