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Scanning geometry

Characteristics:

KLIPPEL R&D System
Geometry of the surface in cylindrical coordinates SCN
Export in dxf, stl and other format SCN

The geometry of the cone, diaphragm and other radiators have a significant influence on the mechanical vibration and radiation characteristics. Therefore, the geometry of the final prototypes and the accuracy of tools have to be checked on a regular basis. Modern numerical design tools (finite element method, boundary element method) need precise geometrical data as input. 

KLIPPEL R&D SYSTEM (development)

Module

Comment

Scanning Vibrometer (SCN)

SCN measures the geometry at high precision and finds optical errors automatically by performing two independent measurements at each point and correlating the results. The data can be exported in dxf, stl and other formats.

Example:

The Scanning Vibrometer (SCN) uses a turntable and two linear actuators for scanning of arbitrary surfaces in polar coordinates.
The Scanning Vibrometer (SCN) uses a turntable and two linear actuators for scanning of arbitrary surfaces in polar coordinates.

Standards:

  • AES2-1984 AES Recommended practice Specification of Loudspeaker Components Used in Professional Audio and Sound Reinforcement



Papers and Preprints:

W. Klippel, et al., “Distributed Mechanical Parameters of Loudspeakers Part 1: Measurement,” J. of Audio Eng. Soc. 57, No. 9, pp. 500-511 (2009 Sept.).

W. Klippel, et al., “Distributed Mechanical Parameters of Loudspeakers Part 2: Diagnostics,” J. of Audio Eng. Soc. 57, No. 9, pp. 696-708 (2009 Sept.).

F. J. M. Frankort, “Vibration Patterns and Radiation Behavior of Loudspeaker Cones,” J. of Audio Eng. Soc., Volume 26, No. 9, pp. 609-622 (September 1978).

A. J. M. Kaizer, “Theory and Numerical Calculation of the Vibration and Sound Radiation of Cone and Dome Loudspeakers with Non-Rigid Diaphragms,” presented at the 62nd Convention of the Audio Eng. Soc., March 1979, Preprint 1437.

A. Chaigne, et al., “On the Influence of the Geometry on Radiation Electrodynamic Loudspeakers,”    presented at the 120th Convention of the Audio Eng. Soc., (May 2006), Preprint 6775.

P. J. Anthony, et al., “Finite-Element Analysis in the Design of High-Quality Loudspeakers,”   presented at the 108th Convention of the Audio Eng. Soc., February 2000, Preprint 5162.

M. Karjalainen, et al., “Comparison of Numerical Simulation Models and Measured Low-Frequency Behavior of a Loudspeaker,” presented at the 104th Convention of the Audio Eng. Soc., May 1998, Preprint 4722.

J. Wright, “Finite Element Analysis as a Loudspeaker Design Tool,” Paper MAL-11; Conference: AES UK Conference: Microphones & Loudspeakers, The Ins & Outs of Audio (MAL), March 1998.

H. Vollesen, “Control of Loudspeaker Directivity by Mechanical Optimization of the Diaphragm,” presented at the 94th Convention of the Audio Eng. Soc., March 1993, Preprint 3528.

A. Kaizer, “Calculation of the Sound Radiation of a Nonrigid Loudspeaker Diaphragm Using the Finite-Element Method,” J. of Audio Eng. Soc., Volume 36, No. 7/8, pp. 539-551; July 1988.