扬声器振膜的振动和辐射分析.pdf

扬声器振膜的振动和辐射分析 扬声器振膜的振动和辐射分析 Vibration and Radiation Analysis of Loudspeaker Cones Vibration and Radiation Analysis of Loudspeaker Cones Wolfgang Klippel KLIPPEL GmbH 扬声器振膜的振动和辐射分析, 1 www.klippel.de 扬声器振膜的振动和辐射分析 Abstract: Abstract: • Loudspeaker cones are more or less flexible structures performing bending and membrane modes at higher frequencies. The cone break-up is a desired mechanism giving more SPL output and a better directivity pattern than a rigid cone or piston. The measurement of the mechanical vibration by using Laser scanning techniques is the basis for getting a deeper insight into the mechanical vibration and their relationship to the acoustical radiation. Displacement sensors based on triangulation technique are an interesting alternative to cost-intensive Doppler Interferometry because not only the vibration but also the geometry of the cone is measured at high precision. This data can be used for cone design with FEA and is required for predicting the SPL output. A new vibration and radiation analysis is presented. It reveals radial and circular modes and separates vibration components which generate sound from other others which reduce the acoustical output. This technique opens new ways for loudspeaker diagnostics and cone optimization which is illustrated on woofers, tweeters, headphones and micro-speakers. 扬声器振膜的振动和辐射分析, 2 www.klippel.de 扬声器振膜的振动和辐射分析 扬声器- 一个动态系统 扬声器- 一个动态系统 Loudspeaker - a dynamic system Loudspeaker - a dynamic system Audio band 音频范围 Frequency 振动频率 1 Hz 100 Hz