Abstract
The vibration modes and eigenfrequencies of a cone‐type diaphragm were investigated making use of the finite element method. First, the equations to predict the first and second eigenfrequencies of a straight cone with free boundary were derived from the numerical results. The eigenfrequencies become smaller as the cone angle and the ratio of outer to inner radius increase. The cone thickness has relatively small effect on the eigenfrequencies. The vibration modes and eigenfrequencies of a cone diaphragm with a voicecoil at the inner perimeter and a surround at the outer perimeter are different from those with free boundary. The surround has its own resonant frequencies decided by its physical properties and shape, which are independent on the diaphragm parameters. Young's modulus and mass density of the surround are most effective on the first mode of the diaphragm. Higher modes are much less sensitive to these parameters. The modes, eigenfrequencies, and the frequency response of a loudspeaker with an aluminum diaphragm were compared with the numerical results with good agreement.
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