| ??? 07/06/06 14:24 Modified: 07/06/06 14:27 Read: times |
#119741 - Partial oscillations Responding to: ???'s previous message |
Steve said:
Shame, I always thought active postional feedback would make THE best transducer. Yes, sounds good at the first look. But you don't have everything under control with it. All chassis suffer from partial oscillations, where the membrane isn't stiff any longer but starts to oscillate itself. You will have points on the membrane showing maximum excursions and others where the membrane is totally "quiet". Partial oscillations begin at frequencies where the wave length equals the dimension of membrane. Most of the partial oscillations of a chassis can be detected in the waterfall spectrum, where at certain frequencies the sound seems not wanting to break down. Once invoked partial oscillations can hardly be damped by the amplifier again, because the oscillations are within the membrane, where the amplifier has no "access" to them. Kai |
| Topic | Author | Date |
| Poor man's dds function generator | 01/01/70 00:00 | |
| besides the point, but | 01/01/70 00:00 | |
| analog electronics... | 01/01/70 00:00 | |
| many uses | 01/01/70 00:00 | |
| As important as the scope | 01/01/70 00:00 | |
| Absolutely agree | 01/01/70 00:00 | |
| I do often use a sine burst generator | 01/01/70 00:00 | |
| That sounds like an application for ... | 01/01/70 00:00 | |
| Active ? | 01/01/70 00:00 | |
| yeah well | 01/01/70 00:00 | |
| No | 01/01/70 00:00 | |
| Shame | 01/01/70 00:00 | |
Partial oscillations | 01/01/70 00:00 |