Ultrasonic wave propagation of flexible piezoelectric polymer for tactile actuator: simulation and experiment

Abstract

This study deals with ultrasonic wave propagation on a piezoelectric polymer substrate for tactile actuator. On the piezoelectric polymer substrate, a pair of interdigital transductor (IDT) electrodes is patterned by lift-off process and a resonator is made by exciting the IDTs. A standing wave is generated between the pair of IDT electrodes, of which the wavelength matches with the distance between two IDTs. The standing ultrasonic waves can give different textures to the users. The wave propagation in this periodic structure on the polymer substrate is studied by harmonic and transient analysis. Vertical displacement and induced voltage at the output IDT electrode are calculated and the ultrasonic wave generation is experimentally verified. The proposed concept of tactile actuator based on ultrasonic wave is explained.

Temperature and frequency‐dependent creep and recovery studies on PVDF‐HFP/organo‐modified layered double hydroxides nanocomposites

“…The special characteristics of this class of materials stem from fluorine atoms having a specific arrangement on their chain backbone . PVDF and PVDF‐TrFE are the most famous fluorine containing piezoelectric materials being widely used in applications such as ultrasonic motors and pressure sensors and also as ion exchange membranes in fuel cells . Pi and coworkers designed a nano‐energy transducer based on PVDF‐TrFE .…”

Emerging Material Technologies for Haptics

“…When an electric bias is applied to the piezoelectric materials, it expands and pushes the membrane upward . Another example of a tactile stimulator based on piezoelectric polymer was demonstrated by Akhter et al In their device, a PVDF film based resonating actuator was coupled with a PI chamber. 80 µm thick PVDF film was sandwiched between two 100 nm thick Ag electrodes.…”

“…The actuated dots could perform 257 nm displacement with 339 N m −2 pressure, which is marginally in the range perceivable by the tactile sense. The response time of the stimulators was 0.7 ms with an input voltage of 80 V. Several other examples of soft tactile actuators based on piezoelectric materials have also been developed …”

Polyvinylidene Fluoride Energy Harvester with Boosting Piezoelectric Performance through 3D Printed Biomimetic Bone Structures

“…Piezoelectric materials are of great significance in practical applications as they can convert compressive/tension stresses into electric charge or vice versa. 1 Over the past few years, piezoelectric polymer devices have been widely used in sensors, 2,3 actuators, 4,5 energy harvesters, 6−8 and other fields 9−11 due to their high energy conversion efficiency and high piezoelectric sensitivity. 12,13 The traditional piezoelectric polymer devices are mostly made of a thin-film structure, which cannot make full use of the normal space to produce sufficient strain, leading to limited piezoelectric output.…”

“…Piezoelectric materials are of great significance in practical applications as they can convert compressive/tension stresses into electric charge or vice versa . Over the past few years, piezoelectric polymer devices have been widely used in sensors, , actuators, , energy harvesters, − and other fields − due to their high energy conversion efficiency and high piezoelectric sensitivity. , The traditional piezoelectric polymer devices are mostly made of a thin-film structure, which cannot make full use of the normal space to produce sufficient strain, leading to limited piezoelectric output. − To improve the piezoelectric output of the device, structures such as micropores, , micropillars, , micropatterns, , and microfibers − were introduced into the polymer film, which can cause a stress concentration effect and greatly magnify the strain as well as the piezoelectric output. , …”