A simple predistortion technique for suppression of nonlinear effects in periodic signals generated by nonlinear transducers
| Autor: | Antonin Novak, Laurent Simon, Pierrick Lotton |
|---|---|
| Přispěvatelé: | Laboratoire d'Acoustique de l'Université du Mans (LAUM), Centre National de la Recherche Scientifique (CNRS)-Le Mans Université (UM) |
| Rok vydání: | 2018 |
| Předmět: |
Acoustics and Ultrasonics
Computer science Mechanical Engineering Acoustics 020208 electrical & electronic engineering 02 engineering and technology Condensed Matter Physics 01 natural sciences Signal Predistortion Nonlinear vibrations Vibration [SPI]Engineering Sciences [physics] Nonlinear system Nonlinear acoustics Transducer System under test Mechanics of Materials 0103 physical sciences Nonlinear systems 0202 electrical engineering electronic engineering information engineering 010301 acoustics Spectral purity |
| Zdroj: | Journal of Sound and Vibration Journal of Sound and Vibration, Elsevier, 2018, 420, pp.104-113. ⟨10.1016/j.jsv.2018.01.038⟩ |
| ISSN: | 0022-460X 1095-8568 |
| DOI: | 10.1016/j.jsv.2018.01.038 |
| Popis: | International audience; Mechanical transducers, such as shakers, loudspeakers and compression drivers that are used as excitation devices to excite acoustical or mechanical nonlinear systems under test are imperfect. Due to their nonlinear behaviour, unwanted contributions appear at their output besides the wanted part of the signal. Since these devices are used to study nonlinear systems, it should be required to measure properly the systems under test by overcoming the influence of the nonlinear excitation device. In this paper, a simple method that corrects distorted output signal of the excitation device by means of predistortion of its input signal is presented. A periodic signal is applied to the input of the excitation device and, from analysing the output signal of the device, the input signal is modified in such a way that the undesirable spectral components in the output of the excitation device are cancelled out after few iterations of real-time processing. The experimental results provided on an electrodynamic shaker show that the spectral purity of the generated acceleration output approaches 100 dB after few iterations (one second). This output signal, applied to the system under test, is thus cleaned from the undesirable components produced by the excitation device; this is an important condition to ensure a correct measurement of the nonlinear system under test. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect