dB(A) or loudness - best analysis for my NVH task

Рет қаралды 15,769

Күн бұрын

A proper analysis is key when comparing different noises to analyze which one is louder. But what is the best analysis for this acoustic test application?
In this tutorial we introduce two different analyses:
• Sound pressure level dB(A)
• Loudness sone
We compare the performance with respect to the following aspects:
• Scaling 01:20
• Frequency Weighting (A B C D) 03:43
• Time Response 08:25
• Masking Effect 12:04
• Frequency Resolution 12:30
• Level of detail 15:31
• Time Resolution 17:21
• Overall Summation 20:29
All analyses are presented wihtin the acoustic analysis software ArtemiS SUITE, which offers these flexible options.
German version:
• Schalldruckpegel dB(A)...
0:00 Introduction
1:28 Scaling
3:48 Topic Frequency Weigthing
8:31 Topic Time Response
12:09 Topic Masking Effect
15:32 Topic Level of Detail
17:23 Time Resolution
Meet us:
www.head-acoustics.com

Пікірлер: 51

@imranward4092 4 жыл бұрын

Didn't expect this to be so clear and concise. Thank you!

@HEADacousticsInternational 4 жыл бұрын

Sometimes it is that clear. Thanks for your feedback

@tylerharper9698 3 жыл бұрын

This video was fantastic, great sweeping overview and introduction to acoustic analysis. Well done! Please keep generating videos like this so that we can all learn :-)

@mohamedfaroukababou8364 3 жыл бұрын

I think that this is the best video on youtube that explains the difference between different weightings and the loudness. Thank you sir.

@HEADacousticsInternational 3 жыл бұрын

Wow, that is motivating! Thank you for your feedback.

@sachinranga7818 4 жыл бұрын

The video was very informative. The explanation was very simple and effective. I hope you guys release more videos like these. Thank you.

@HEADacousticsInternational 4 жыл бұрын

Thanks for your feedback. We have more to tell :-) We think you will like it.

@mhediseltana 9 ай бұрын

Perfect analysis. Thanks for adding and please keep doing such good videos

@HEADacousticsInternational 9 ай бұрын

Thanks for your nice feedback. There is more about to come :-)

@ricardogonzalez1286 4 жыл бұрын

this is very good and clear, thank you very much!

@HEADacousticsInternational 4 жыл бұрын

You are welcome! Thanks for your nice feedback.

@davidlivett7420 2 жыл бұрын

This was great, thank you

@pandabear4321gogo 3 жыл бұрын

Great video! Just started studying acoustics and whilst I haven't encountered a lot of things in the video, there are plenty of fundamental stuff which is of great help.

@HEADacousticsInternational 3 жыл бұрын

Thanks for your feed back. There is much more to learn about acoustics on our channel. So stay tuned :-)

@Aiprojects970 4 жыл бұрын

simple and super way of explaining. Thank you for this.

@HEADacousticsInternational 4 жыл бұрын

You are welcome

@Aiprojects970 4 жыл бұрын

Can you include Transmission loss chapter with two source and two load method with advantage of each method. Thank you

@amankaushik6470 4 жыл бұрын

I have recently started using Artemis Software, and this video would definitely help me in my analysis, Thank You! Really good Explanation

@HEADacousticsInternational 4 жыл бұрын

Thank you for your feedback. We wish you a good start in the world of acoustic optimisation.

@kyleanderson2896 6 ай бұрын

Wow, this was a great explanation! I’ve been researching devices measures in sones instead of decibels, but don’t have any previous experience with sones… which lead me here. Thanks for such a relatable explanation using real examples and data!

@HEADacousticsInternational 6 ай бұрын

Thank you for your feedback. There are also devices that can do both and calculate the sone and decibel values for each measurement. We show such a device, for example, from the second half of this tutorial on calculating decibel values. kzfaq.info/get/bejne/arKRq72Wx86bgqM.html Both loud noise and low-noise microphones can be connected here to correctly evaluate every kind of noises in decibels or sone.

@s0nicblastPkG 4 жыл бұрын

Thank you!

@MrNBit 3 жыл бұрын

Thank you soooooooo much! You have value

@HEADacousticsInternational 3 жыл бұрын

You are welcome. Thanks for your feedback.

@Uluc994 2 жыл бұрын

I am speechless 😶 awesome explanations!

@Uluc994 2 жыл бұрын

Especially loved 10:33

@HEADacousticsInternational 2 жыл бұрын

Thank you for that nice feedback. We love to teach :-)

@danishteo6991 2 жыл бұрын

Nice.. My lecturer did not explain this clearly..But you made me understand

@HEADacousticsInternational 2 жыл бұрын

We have understood acoustics from the core. So you do, too

@xnoiseacoustics Жыл бұрын

Thank you Head, you provided excellent examples and a very good way to display the small sounds that can be annoying that we hear and yet cannot display in dB(A) measurements. Sones are best to display if the noise has components that could be heard by the human and be aggravating, especially useful for psychoacoustic analysis. I am really liking your videos and your software. Maybe one day I will be able to try out the Artemis Suite.

@HEADacousticsInternational Жыл бұрын

Thank you for your detailed feedback on our tutorials and analysis software. We are pleased to read how you have seen the advantages of advanced analysis over the more common sound pressure level and third octave analysis. On this channel you will find more recommendations for valuable analyses and quick evaluation of measurements. You might ask for a test version of ArtemiS SUITE. Enjoy!

@sandmantistis6668 4 жыл бұрын

Thank you for this good video

@romantkachuk168 4 жыл бұрын

rough dB to power factor scale: 1 = 1.25 2 = 1.6 3 = 2 6 = 4 9 = 8 10 = 10 20 = 100 30 = 1000 ... Quick ex: 17dB ~> 10 x 4 x 1.25 ~> 50 times

@shakeelahmed4848 3 жыл бұрын

Test a gas stove at, e.g., five different powers. Record the acoustic signal and the sound pressure level [this latter will not be a precise value, but their ratios will be]. For the acoustic signal, you can use, e.g., the Spectroid or Spectrogram app (there are a lot of apps out there to do FFT on the microphone signal). For the sound pressure level, you can use, e.g., the Andro sensor app. Evaluate the measurement result

@HEADacousticsInternational 3 жыл бұрын

The same app on different smart phones leads to completly different values (level and spectrogram). Using an app on a smart phone will never lead to a calibrated value you can rely on.

@masahalfahil5225 4 жыл бұрын

It was very informative, thank you very much. I have a question. I am trying to create my own sound level meter I have a loudness sensor (Grove loudness sensor ) and want to calculate the dB SPL from the Sonsor readings (ADC values). How can i get it?

@HEADacousticsInternational 4 жыл бұрын

Dear Mrs. Al Fahil thank you for your feedback. We like to discuss your detailed questions via email with you directly. Please send your questions to social-media@head-acoustics.de to get in contact.

@masahalfahil5225 4 жыл бұрын

@@HEADacousticsInternational I will do that. Thank you very much

@simonjahnke7362 4 жыл бұрын

Thank you for this very interessting an good way of explaining this topic. Two questions are still left in my mind: 1. Is there something like limit/value in sone which explains if a noise/tone is "okay" or "not okay"? 2. Is there a equivalent of loudness which ist somehow related to the dB(A)? It would be great to hear from you!

@HEADacousticsInternational 4 жыл бұрын

To your first question, no. It depends on the application: An air conditioner at night has a different limit than a sports car at full throttle. A sound is good if it meets human expectations. That's why I advocate loudness. It's not about energy. It's all about the human perception of sound.

@HEADacousticsInternational 4 жыл бұрын

Your second question has been answered by Roman already. Thanks.

@truhunk1 2 жыл бұрын

OK, but if we want to measure continuous machinery noise to see if it causes ear damage, what do we use on our meter, A or C ?

@HEADacousticsInternational 2 жыл бұрын

Good day, you have already recognized this correctly. The averaged sound pressure level is used to assess possible hearing damage caused by sound. Which weighting - as dB(A) or db(C) - is regulated, for example in Germany, by the Noise and Occupational Health and Safety Ordinance. As also explained in the video, dB(C) values are used for high level peaks. For continuous exposure to sound, the ordinance prescribes dB(A). It is best to consult the noise protection ordinance of your country. We hope we could help you with this.

@aymaneelfahsi8048 2 жыл бұрын

hello sir, what is excatly meant by AVERAGE in the sinusoidal sounds FFT plotting? Is the graph plotting Leq or you just meany by it : fundemtnal harmonic == average

@HEADacousticsInternational 2 жыл бұрын

Hello, to the different sinus tones we applied the standard analysis FFT( Average). So there is one averaged spectrum calculated for the whole time length. Alternatively, there are, for example, the analyses FFT (peak hold) - showing the highest level for each freqeuncy - or FFT vs time - showing the spectrum over time in a 3D-plot

@aymaneelfahsi8048 2 жыл бұрын

@@HEADacousticsInternational thanks sir! Another question please: if i have an fft array of N input pressure values(sampling), is the array normalized and compensated by removing negative frequencies good for measuring LAeq? I have a determining end of year engineering project: I'm planing on calculating for each bin the corresponding Leq(LAeq by changing gain with application of values given by standards), and that's by supposing the ambiant sound consisting of N incoherent sinusoidal sound tones as you said(N number of samples), then summing the LAeq of different bins by the same formula used for summing of sound pressure levels from different sources.

@HEADacousticsInternational 2 жыл бұрын

Such a question cannot be answered in the course of a KZfaq chat. Here we present and discuss ready-made customer solutions. You can contact our engineering service department with questions about the calculation method. engineering@head-acoustics.com

@shakeelahmed4848 3 жыл бұрын

please guide me

@abu.selim26 Жыл бұрын

Which software you have used sir?

@HEADacousticsInternational Жыл бұрын

I have been using the ArtemiS SUITE software for years to analyse noise and vibrations. It's all in there and it's easy to use from day one. If you are interested, you can contact the company at www.head-acoustics.com and ask for more information or test possibilities.