The following videos comprehensively introduce and explain NVH (Noise, Vibration and Harshness). Have a look at the NVH Kits and Accessories for more details.
1. An Introduction to NVH
Pico have created a series of videos presented by Frank Massey and Steve Smith, which introduce you to Noise, Vibration and Harshness. The first video in the series introduces NVH and explores some basic concepts.
Running time: 25 min 14 sec.
The second video in the series tackles NVH theory. Understanding this theory is vital when deciphering NVH data. Vibrations vs sounds? How are they generated, transferred and what effects do they have? Is a particular noise or vibration a characteristic of the vehicle?
Running time: 22 min 48 sec.
3. Working with NVH
The third video shows how to use NVH when solving customer problems. Learn how to set up a session using the Pico Diagnostic Software. Understand how the data can be presented as frequencies, bar graphs and in the time domain.
Running time: 7 min 49 sec.
4. Deciphering Road Test Results
The fourth video in the series takes NVH data from a road test, and you learn how to decipher it to track down the source of a vibration. Always try to reduce the number of variables. You can pinpoint vibrations by using multiple accelerometers.
Running time: 12 min 5 sec.
5. Pinpointing using the Time Domain
The fifth video investigates how vibrations travel. Find an impulse noise (knock, bang or rattle) by measuring delay by using the PicoScope as a conventional oscilloscope and working back to the source. Use the PicoScope 6 or 7 software to find minute time differences.
Running time: 14 min 25 sec.
6. Noise and Sound Analysis
The sixth video in the series investigates Sounds and Noises. Learn how to use an Optical Sensor and a microphone. Find problems at frequencies unrelated to conventional engine (E) transmission - i.e., prop-shaft (P) or tyres (T).
Running time: 11 min 43 sec.
7. NVH Case Studies
The seventh and last video analyses real-world problems and their solutions. Drive shaft misalignment, transmission problems, combustion anomalies and imbalances, customer recordings, frequency generation and wheel bearings can all be diagnosed. NVH is so much more than just finding annoying vibrations and noises. It is a powerful diagnostic tool.
Running time: 24min 12s.
Learn more? Garage Lube offers advanced NVH Training.
Finding the cause of Cabin Vibration with the PicoScope Function Generator
Steve Smith demonstrates how he used the function generator in the NVH software to find the cause of a vibration in his car, which had been bothering him for a long time.
Running time: 2 min 59 sec.
Find that Rattle!
Diagnosing the source of cabin squeaks and rattles is time-consuming and consequently, costly. Trying to reproduce these offending noises may involve multiple road tests with at least one Technician and a driver, many times without success! Using the Pico NVH Function Generator, the vehicle can be “excited” using a broad range of frequencies generated by the in-car audio system without leaving the workshop. This will leave the Technician free to pursue the source of the rattle, which may not even be located inside the cabin!
This video follows on from the previous one and is a case study involving a rattle in a Corvette.
Running time: 7 min 54 sec.
Steve goes through the prop-shaft balancing feature in PicoDiagnostics. He shows you how the software guides you through the process and helps you to balance the prop-shaft correctly.
Running time: 13 min 18 sec.
NVH Kit Introduction
This video demonstrates an old NVH Starter Kit (one accelerometer and one microphone) with the previous 4425 oscilloscope. It demonstrates how to connect the NVH kit and how to use the software. It shows how powerful NVH is, even when using an old single channel accelerometer. The use of a microphone is demonstrated on 4 and 6-cylinder engines. A radial force variation vibration was also diagnosed, using the accelerometer.
Running Time: 20 min 25 sec.