Modelling, identification and control of a Langevin transducer

Abstract

is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Abstract-The control of the vibration amplitude, and the resonance frequency tracking for ultrasonic transducer have been established. However, some applications require to control the vibration amplitude and its relative phase at a fixed frequency as the generation of travelling wave. In this paper, the transducer is modelled in rotating frame, and the decoupling according to two-axis allows to obtain a double independent closed loop control to address this issue. It is possible to control the transducer vibration amplitude and its relative phase, in steady state even in transient by acting on the amplitude of the supply voltage. Thanks to vector control method. This approach will be confirmed with experimental and simulation results.

Fundamental Acoustical Finger Force Calculation for Out-of-Plane Ultrasonic Vibration and its Correlation with Friction Reduction

“…An external power amplifier (HSA 4051 from NF, Japan) amplifies the controller's output up to 200V peak-peak. The parameter N of the plate has been identified using the methodology described in [11] and its value is N = 0.02N/V . The no-load test measurement presented figure 4 has been used to identify D = 0.2848N.s.m −1 .…”

PCA Model of Fundamental Acoustic Finger Force for Out-of-Plane Ultrasonic Vibration and its Correlation with Friction Reduction

“…The acoustical finger force 𝑓 𝑟 contains a fundamental, which is at the resonance pulsation of the plate, and harmonics. Due to the resonant behavior of the plate, the harmonics do not influence the plate's vibration, and therefore, only the fundamental can be observed with equation (11). In the particular case of ideal intermittent contact condition, he forces 𝐹 𝑟𝑑 and 𝐹 𝑟𝑞 are then calculated by 1st harmonic decomposition.…”

“…Over an amplitude sweep, it is possible that the conditions for examples 2 and 3 occur consecutively. That is, for lower amplitudes the finger remains in contact with the plate, and the forces in the 𝑑𝑞 frame are defined by (11). From a given amplitude (hereby defined 'breakpoint'), intermittent contact occurs, and thus the forces would be defined by (14).…”

Projeto De Um Transdutor Ultrassônico Flangeado Para Aplicação Em Limpeza De Dutos

“…Quando a voltagem alternada é aplicada nos eletrodos, a vibração longitudinal é gerada. Uma amplitude de vibração maior pode ser observada na frequência de ressonância [5,7,8].…”