AES中相位塞设计文献 - AES专区 - 声学楼论坛

New Methodology for the Acoustic Design of Compression Driver Phase Plugs with Concentric Annular Channels

Compression drivers couple a radiating diaphragm to a horn throat of smaller area, resulting in high efficiency. Commonly a phase plug is used to control the transition from diaphragm to horn in order to improve the high-frequency performance. In this paper a new design method for the positioning of annular phase plug channels is presented in order to improve the driver response.

Click to purchase paper or login as an AES member. If your company or school subscribes to the AES Journal then you can look for this paper in the institutional version of the Online Journal. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!

This paper costs $20 for non-members, $5 for AES members and is free for E-Library subscribers.

In compression drivers a large membrane is coupled to a small horn throat resulting in high efficiency. For this efficiency to be maintained to high frequencies the volume of the resulting cavity, between horn and membrane, must be kept small. Early workers devised a phase-plug to fill most of the cavity volume and connect membrane to horn throat with concentric annular channels of equal length to avoid destructive interference [Wente us2037187].
Later work, representing the cavity as a flat disc, describes a method for calculating the positions and areas of these annular channels where they exit the cavity, giving least modal excitation, thus avoiding undesirable response irregularities [smith 1953].
In this paper the result of applying both the equal path-length and modal approaches to a phase-plug with concentric annular channels coupled to a cavity shaped as a flat disc is further explored. The assumption that the cavity may be represented as a flat disc is investigated by comparing its behavior to that of an axially vibrating rigid spherical cap radiating into a curved cavity.
It is demonstrated that channel arrangements derived for a flat disc are not optimum for use in a typical compression driver with a curved cavity.
A new methodology for calculating the channel positions and areas giving least modal excitation is described. The impact of the new approach will be illustrated with a practical design.
--------------------------------------------------------------------------------

主题：AES中相位塞设计文献

AES E-Library

New Methodology for the Acoustic Design of Compression Driver Phase Plugs with Concentric Annular Channels