Engine run up
For a engine run you need to be the same amount of time, every time.
If you do a slow run up and take 16 or 18 seconds, you need to pick a time an use that.
This is more difficult than it sounds. So what ever time you use, be within a 3/4 of second of this time.
Most data acquisition equipment can acquire engine run ups at almost any rate.
This is the second article in a series on the subject of sound
and vibration quality. The first (May 2007) covered the sound and
vibration quality target development process. This focuses on the
automotive industry and specifically on sound quality issues in
vehicles (vibration quality will be covered separately) related to
powertrain, road and wind noise. The next article will discuss
sound quality criteria for the remaining automotive components/
sub-systems [accessories, BSR (buzz, squeak & rattle), brake, static
sounds]. I need to remind the readers that my goal is to provide
a review of knowledge and techniques, well knowing that it will
not be exhaustive and that I will miss a lot of things. I apologize
in advance and I would like to ask readers to e-mail me with comments,
questions and suggestions for the next articles in the series.
This article provides a brief summary of objective parameters or
metrics used for each sub-system/component in a vehicle. The
description of the techniques used to derive either these metrics
(signal processing) or their correlation to customer perception
(jury studies) is outside the scope of this article. However, an
extensive list of references is provided, where these methods are
detailed (references are grouped by system and chronologically
within each system). Finally, the article is limited to the sound
inherent in a vehicle during its operation, so it does not address
issues such as sound quality of car audio or active noise control
systems.