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Mechanical vibrators are instrumental in compacting newly poured concrete within formwork and around reinforcements. This process is essential to eliminate trapped air pockets and establish a dense concrete mass. One widely used method is vibrating by internal vibrators, often referred to as a poker vibrator or immersion vibrator. It is rapidly inserted through the full depth of the freshly laid concrete and slightly extends into the layer below it (which remains in a plastic state). Consistent...
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Updated: Mar 28, 2026

A Polymer-based Piezoelectric Vibration Energy Harvester with a 3D Meshed-Core Structure
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Ultrasonic motors with polymer-based vibrators.

Jiang Wu, Yosuke Mizuno, Marie Tabaru

    IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
    |December 17, 2015
    PubMed
    Summary

    New polymers show promise for lightweight ultrasonic motors (USMs). Polymer-based USMs offer higher speeds than aluminum under light loads, with polyphenylenesulfide being a key material.

    Area of Science:

    • Materials Science
    • Mechanical Engineering
    • Physics

    Background:

    • Polymers offer low density and elastic moduli, making them suitable for high energy density ultrasonic motors (USMs).
    • Traditionally, polymers were considered too lossy for high-amplitude vibrators, but new materials exhibit improved vibration characteristics.

    Purpose of the Study:

    • To evaluate the damping coefficients of functional polymers for USM vibrator applications.
    • To investigate the vibration characteristics of polymer-based bimorph vibrators.
    • To fabricate and test a polymer-based bending mode ultrasonic motor.

    Main Methods:

    • Measurement of damping coefficients for selected functional polymers.
    • Fabrication of bimorph vibrators using low-attenuation polymers.

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  • Construction of a bending mode USM utilizing a polymer rod and piezoelectric plates.

    • Main Results:

    • Polymer-based USMs demonstrated higher rotation velocities compared to aluminum-based USMs under light preload conditions.
    • The maximum torque of polymer-based USMs was lower than that of aluminum-based USMs.
    • Polyphenylenesulfide emerged as a prospective material for USMs under light preloads due to its high amplitude and low weight.

    Conclusions:

    • Polymers are viable materials for ultrasonic motor construction, particularly for applications requiring high speed and low weight.
    • Polyphenylenesulfide shows significant potential for developing advanced, lightweight ultrasonic motors for specific load conditions.