NVH: Using Multiple Sensor Mode | PicoScope Automotive 

I watched 2/3ds of the video before stopping. It got to be too difficult (volume) and monotone to hear and listen to along with confusing to understand. The volume of the narration analysis was very low and I had to turn my speakers all the way up when normally I can leave the speaker setting at 50%. I found what I watched interesting but I'm always confused as to what types of noises and vibration is associated with what frequencies. I also found it difficult to follow when looking at the bottom graph how that aligned up with the top graph. They didn't seem to be right on top of each other vertically. Finally how many shops do you think have afforded to purchase 4 accelerometers or NVH kits? I would think a shop would have to do a ton of NVH work to justify the expense. I do appreciate your effort to educate us. I wish I had more frequency and NVH knowledge and practical experience to understand it better.

Hello DrivelineMaster, I’m really sorry that your experience of this video was nothing like mine, but when I think about your comments, I can understand your frustrations. And your closing comments are perfectly valid, a point that Steve has made in at least one previous video. I can’t tell from your post if you have an NVH kit or not. If you don’t have one, then trying to make sense of NVH videos and tutorials would be really difficult. And if you do have a kit, you really have to invest a fair bit of your free time getting to know it, and also - unless you’re using it frequently - keeping yourself familiar with it. But that goes for PicoScope anyway; if I haven’t used it for a while, I’m quite rusty when I pick it up again. I started off with a basic kit: one accelerometer and one microphone, which is a great way to start because you can learn all the basics and it’s not too overwhelming, and you can probably do everything you’d ever want to do with it. Later on, I bought 2 more accelerometers not because they were essential, but because I realised I could do a little more with them - it was a bit of a nice-to-have decision. With more accelerometers you can perhaps do something a little quicker or a little more elegantly. But unless you are doing research, or unless you are specialising in NVH jobs that other garages find too difficult, you won’t want, or could justify, more than one accelerometer, and you certainly won’t be concerned about elegance!; this is something Steve has told me personally as well as mentioning in previous videos. There must be quite a bit of kit, and tools, that garages invest in with enthusiasm, but which sit in cupboards gathering dust because it takes time and patience to use them effectively. Have you watched any of the basic NVH videos? This video is perhaps a little like jumping into an advanced maths class when you’re quite rusty on the basic maths or never learnt it well enough in the first place. As for the bottom graph not matching the top graphs, I assume you mean the waveform of the microphone and that of the accelerometers? Remember that the bottom graph - the microphone recording - is advancing in time. It’s a graph of sound intensity against time. On the other hand, the top graphs are the results of analyses of the frequencies of vibration, so you’re looking at amplitude/intensity against frequency, not time. If it were graphed against time, it would look very much like the microphone graph, but it would be useless to you, because you need to know which frequencies comprise the noise and vibration, so you can then figure out which mechanical parts could possibly produce such frequencies. But if I have misunderstood your comment, and you already know this, then I apologise. I listened to the video on an iPad. My volume was a little over halfway, but I do think I recall having to turn it up a couple of times only to turn it back down slightly, later. To summarise, you can watch all the NVH videos, from very basic to advanced, but there really is no substitute for using the kit to analyse a problem, or to run through a tutorial. Only then will it start to make sense. Same way you can’t learn maths without having to do lots of examples and exercises. It is confusing at first; I’m sure everyone feels the same frustrations that you feel when they get started: there’s a lot to “get your head around”, not least of which is grasping the concept of frequency domains, which, once you have got your head around it, you wonder what took so long. At least, I did. If you have any other questions, please ask: chances are it’s something that we also have had difficulties with. @DrivelineMaster

my dad das a good job I am 9 year's old yay