Time Scale Re-Sampling to Improve Transient Event Averaging

972005

05/20/1997

Event
SAE Noise and Vibration Conference and Exposition
Authors Abstract
Content
As the drive to make automobiles more noise and vibration free continues, it has become necessary to analyze transient events as well as periodic and random phenomena. Averaging of transient events requires a repeatable event as well as an available trigger event. Knowing the exact event time, the data can be post-processed by re-sampling the time scale to capture the recorded event at the proper instant in time to allow averaging. Accurately obtaining the event time is difficult given the sampling restrictions of current data acquisition hardware. This paper discusses the ideal hardware needed to perform this type of analysis, and provides analytical examples showing the transient averaging improvements using time scale re-sampling. These improvements are applied to noise source identification of a single transient event using an arrayed microphone technique. With this technique, the averaging is performed using time delays between potential sources and microphones in the array. As a result, the relative time information needed is contained within the measured data and a separate trigger event and event time are not required.
Meta TagsDetails
DOI
https://doi.org/10.4271/972005
Pages
9
Citation
Blough, J., Dumbacher, S., and Brown, D., "Time Scale Re-Sampling to Improve Transient Event Averaging," SAE Technical Paper 972005, 1997, https://doi.org/10.4271/972005.
Additional Details
Publisher
Published
May 20, 1997
Product Code
972005
Content Type
Technical Paper
Language
English