Modelling and control of a travelling wave in a finite beam, using multi-modal approach and vector control method

Ghenna, Sofiane; Giraud, Frédéric; Giraud-Audine, Christophe; Amberg, Michel; Lemaire‐Semail, Betty

doi:10.1109/fcs.2015.7138895

Cited by 5 publications

(4 citation statements)

References 20 publications

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“…Excluding the edges of the plate, the SWR reached a value of 1.46 for a centered window covering 54% of the total width of the plate. This value is comparable to those reported for centimeter-sized devices [26,27].…”

Section: Resultssupporting

confidence: 89%

Generation of Linear Traveling Waves in Piezoelectric Plates in Air and Liquid

et al. 2019

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A micro- to milli-sized linear traveling wave (TW) actuator fabricated with microelectromechanical systems (MEMS) technology is demonstrated. The device is a silicon cantilever actuated by piezoelectric aluminum nitride. Specifically designed top electrodes allow the generation of TWs at different frequencies, in air and liquid, by combining two neighboring resonant modes. This approach was supported by analytical calculations, and different TWs were measured on the same plate by laser Doppler vibrometry. Numerical simulations were also carried out and compared with the measurements in air, validating the wave features. A standing wave ratio as low as 1.45 was achieved in air, with a phase velocity of 652 m/s and a peak horizontal velocity on the device surface of 124 μm/s for a driving signal of 1 V at 921.9 kHz. The results show the potential of this kind of actuator for locomotion applications in contact with surfaces or under immersion in liquid.

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Section: Resultssupporting

confidence: 89%

Generation of Linear Traveling Waves in Piezoelectric Plates in Air and Liquid

et al. 2019

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“…Ameliorative solutions include 'impedance matching', where one of the oscillators acts as a passive absorber through piezoelectric energy dissipation (Hariri, Bernard, & Razek, 2013;Sadayuki, 2002), and 'two-mode excitation', where the two oscillators operate out of phase at a critical frequency that results in a favourable superposition of two consecutive resonant modes of the platform (Loh & Ro, 2000;Tomikawa, Adachi, Hirata, Suzuki, & Takano, 1990). Active feedback control using the latter method has been claimed to provide nearly perfect travelling waves (Ghenna, Giraud, Giraud-Audine, Amberg, & Lemaire-Semail, 2015;Giraud, Giraud-Audine, Amberg, & Lemaire-Semail, 2014).…”

Section: E26-3mentioning

confidence: 99%

Benefits of controlled inclination for contactless transport by squeeze-film levitation

Ramanarayanan,

Sánchez

2023

Flow

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Developed in this paper is a theoretical description of the fluid flow involved in contactless transport systems that operate using squeeze-film levitation. Regular perturbation methods are employed to solve the appropriate Reynolds equation that governs the viscous, compressible flow of air in the slender film separating the oscillator and the levitated object. The resulting reduced formulation allows efficient computation of the time-averaged levitation force and moment induced by fluid pressure, as well as the accompanying quasistatic thrust force that accounts additionally for shear stresses. Investigated, in particular, is the possibility of combining two distinct methods of thrust generation that have been experimentally demonstrated in previous studies – (i) inclination of the levitated body and (ii) generation of asymmetrical flexural deformations, such as travelling waves, on the oscillator surface – the latter of which is shown to allow a transition from the typically repulsive levitation force to one that is attractive. Computations reveal that systematic control of the inclination angle can provide significant performance benefits for squeeze-film transport systems. In the case of attractive levitation, the amount of improvement that can be obtained appears to correlate closely with the degree of lateral asymmetry exhibited by the flexural oscillations.

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“…By imposing the same amplitude and a phase shift of ±90 • on the two modes vibrations, a travelling wave is obtained [15]. In this work, we control the amplitude of each transducer in closed loop as explained in [16]; the advantages are to control the direction amplitude and direction of the travelling wave without any preliminary fitting procedures as in [15], and to mitigate external disturbances such as the pressure of a user's finger [17], [18]. Figure 2 depicts a typical implementation of a system generating an ultrasonic travelling wave.…”

Section: Travelling Wave Generationmentioning

confidence: 99%

Enhancing Variable Friction Tactile Display Using an Ultrasonic Travelling Wave

Ghenna

Vezzoli²,

Giraud-Audine³

et al. 2017

IEEE Trans. Haptics

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In Variable Friction Tactile Displays, an ultrasonic standing wave can be used to reduce the friction coefficient between a user's finger sliding and a vibrating surface. However, by principle, the effect is limited by a saturation due to the contact mechanics, and very low friction levels require very high vibration amplitudes. Besides, to be effective, the user's finger has to move. We present a device which uses a travelling wave rather than a standing wave. We present a control that allows to realize such a travelling wave in a robust way, and thus can be implemented on various plane surfaces. We show experimentally that the force produced by the travelling wave has two superimposed contributions. The first one is equal to the friction reduction produced by a standing of the same vibration amplitude. The second produces a driving force in the opposite direction of the travelling wave. As a result, the modulation range of the tangential force on the finger can be extended to zero and even negative values. Moreover, the effect is dependant on the relative direction of exploration with regards to the travelling wave, which is perceivable and confirmed by a psycho-physical study.

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Modelling and control of a travelling wave in a finite beam, using multi-modal approach and vector control method

Cited by 5 publications

References 20 publications

Generation of Linear Traveling Waves in Piezoelectric Plates in Air and Liquid

Generation of Linear Traveling Waves in Piezoelectric Plates in Air and Liquid

Benefits of controlled inclination for contactless transport by squeeze-film levitation

Enhancing Variable Friction Tactile Display Using an Ultrasonic Travelling Wave

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