This is an update to a previous study, which used mechanical dynamic behavior data, impedance and distortion measurements of several automotive doors to compare low frequency performance and low frequency sound quality. The updated information further investigates a methodology for quantifying door enclosures and refines the criteria for qualifying automotive doors as loudspeaker enclosures. There are obvious limits to our understanding of the above criteria. The tools used in this study are effective for identifying some existing problems in a door design and improving it for that particular application, but limited in giving a general set of design parameters for door design. For instance, there is no clear understanding of the benefit or harm of the Type III reduced resonance type of door enclosure. As system designers the authors are aware of the phenomenon and take advantage of it, but it is also a large source of uncontrolled variability in the design, and potentially a reduction in transient behavior. There is a need for further investigation into the source of the different nonideal behaviors, which would provide a better model for design and quality assessment. This would include a more detailed assessment of the behavior of the different enclosure systems within the overall door/trim system. It would include mechanical dynamic behavior data in the form of displacement and acceleration measurements of the doors and trim and source identification through intensity measurements. And it would include the creation of the model. For now the authors have the stated criteria as general guidelines for volume size vs. loudspeaker size, sufficient baffling for at least a 2nd order low frequency response, controlled losses with apparent mass shifts, roughness targets of less than 1 aspers, and the precaution for protecting woofer's behavior in less than ideal enclosures.
Update to automotive doors as loudspeaker enclosures
2004
32 Seiten, 33 Bilder, 2 Tabellen, 7 Quellen
Conference paper
English
Automotive doors as loudspeaker enclosures
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