Faculty Profiles - Mashimo Tomoaki

Papers - Mashimo Tomoaki

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Micro Linear Ultrasonic Motor With a Hall Sensor-Based Feedback Control System Reviewed

Shunsuke Izuhara, Tomoaki Mashimo

IEEE Access 12 131656 - 131663 2024

Earthworm-Inspired Robot Design: Reducing the Number of Actuators Through Embedded Motor Between Segments Reviewed

William Leonard Liem, Ayato Kanada, Tomoaki Mashimo

IEEE Access 12 114636 - 114644 2024

A Suspended Pollination Robot With a Flexible Multi-Degrees-of-Freedom Manipulator for Self-Pollinated Plants Reviewed

Naoya Masuda, Mohamed M. Khalil, Seitaro Toda, Kotaro Takayama, Ayato Kanada, Tomoaki Mashimo

IEEE Access 12 142449 - 142458 2024

Fabrication and characterization of a submillimeter-scale ultrasonic motor Reviewed

Kohei Kikuchi, Mudassir Hussain, Tomoaki Mashimo

Sensors and Actuators A: Physical 360 114524 - 114524 2023.10

Tilting ultrasonic motor using extension and shear vibration modes Reviewed

Shunsuke Izuhara, Tomoaki Mashimo

Sensors and Actuators A: Physical 357 114390 - 114390 2023.8

Miniature camera module with a hollow linear ultrasonic motor-based focus feature Reviewed

Naoya Masuda, Shunsuke Izuhara, Tomoaki Mashimo

Sensors and Actuators A: Physical 354 114248 - 114248 2023.5

A Closed-Loop Micro-Ultrasonic Motor Control System With Extremum Seeking Reviewed

Mohamed M. Khalil, Naoya Masuda, Kotaro Takayama, Tomoaki Mashimo

IEEE Access 11 22329 - 22341 2023.4

A Palm-Sized Omnidirectional Mobile Robot Driven by 2-DOF Torus Wheels Reviewed

Yunosuke Sato, Ayato Kanada, Tomoaki Mashimo

IEEE Robotics and Automation Letters 8 ( 1 ) 105 - 112 2023.1

Caterpillar-Inspired Insect-Scale Climbing Robot Using Dry Adhesives Reviewed

Mohamed M. Khalil, Tomoaki Mashimo

IEEE Robotics and Automation Letters 7 ( 3 ) 7628 - 7635 2022.7

Performance improvement of micro-ultrasonic motors using the thickness shear mode piezoelectric elements Reviewed

Tomoaki Mashimo, Yoshinari Oba

Sensors and Actuators A: Physical 335 113347 - 113347 2022.3

Design of a Micro Linear Ultrasonic Motor with a Preload Mechanism Reviewed

Shunsuke Izuhara, Tomoaki Mashimo

Seimitsu Kogaku Kaishi/Journal of the Japan Society for Precision Engineering 88 ( 1 ) 51 - 56 2022.1

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)

We present a micro linear piezoelectric ultrasonic motor, which can be used for zooming and autofocusing features in camera modules inside cellphones and endoscopes, it consists of a cuboid stator with a hole and an elastic cylindrical slider. The motor design, in which the slider inserted into the stator hole expands outward, enables a hollow structure for an optimal preload for enhancing the motor thrust force, (n this study, we model the relationship between the dimensions and the preload to quantify the preload value and clarify the design methodology. The size of the prototype stator with piezoelectric elements measures 2,6 mm in height and width and 2.2 mm in depth (the length in slider travel direction). There is a hole of 1,7 mm in diameter at the stator center, and the slider inserted into the hole operates when voltages are applied to the piezoelectric elements. Applying an optimized preload, we evaluate the fundamental characteristics of the motor in experiments, A thrust force of approximately 40 mN and a resolution of about 1 μm were obtained, which may satisfy the specification of a certain type of camera modules.

DOI： 10.2493/JJSPE.88.51

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Lift Generation by a Miniature Piezoelectric Ultrasonic Motor-Driven Rotary-Wing for Pico Air Vehicles Reviewed

Eric TanKai Chiang, Takateru Urakubo, Tomoaki Mashimo

IEEE Access 10 13210 - 13218 2022

Design and characterization of a thin linear ultrasonic motor for miniature focus systems Reviewed

Shunsuke Izuhara, Tomoaki Mashimo

Sensors and Actuators A: Physical 329 112797 - 112797 2021.10

A Millimeter-Scale Rolling Microrobot Driven by a Micro-Geared Ultrasonic Motor Reviewed

Rudolf Yoga Hutama, Mohamed M. Khalil, Tomoaki Mashimo

IEEE Robotics and Automation Letters 6 ( 4 ) 8158 - 8164 2021.10

Comparison study of bending and three-wave vibration modes for micro ultrasonic motors Reviewed

Eric TanKai Chiang, Tomoaki Mashimo

Sensors and Actuators A: Physical 329 112801 - 112801 2021.10

Switching Between Continuum and Discrete States in a Continuum Robot With Dislocatable Joints Reviewed

Ayato Kanada, Tomoaki Mashimo

IEEE Access 9 34859 - 34867 2021

Characterization of bulk piezoelectric element-based ultrasonic motors Reviewed

Shunsuke Izuhara, Tomoaki Mashimo

ROBOMECH Journal 7 ( 1 ) 2020.12

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

Abstract

We propose miniature ultrasonic motors using stators made of a single bulk piezoelectric element. The bulk piezoelectric stator has the potential to increase output by reducing the dissipation that occurs in the adhesion layer between the PZTs and a metallic component in the stator. In this paper, we build two kinds of bulk piezoelectric stators: a cubic bulk stator with a side length of 4.2 mm and a hole of 3 mm in diameter, and a cylindrical bulk stator with an outer diameter of 4.2 mm and the same hole diameter. We evaluate their electrical and mechanical characteristics, such as impedance and vibration velocity. The experiments clarify the advantages of the bulk piezoelectric stators, such as low dissipation. The cubic bulk stator, which shows higher performance than the cylindrical one, is compared with a similar-shaped stator using a bronze cube and thin piezoelectric plates. The performance measures of the cubic bulk ultrasonic motor are optimized by the preload between the stator and rotor.

DOI： 10.1186/s40648-020-00179-w

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Other Link： https://link.springer.com/article/10.1186/s40648-020-00179-w/fulltext.html

CRACKS IN BRIDGE FLOOR DETECTED BY 2-DIMENSIONAL COMPLEX DISCRETE WAVELET PACKET TRANSFORM Reviewed

Zhong Zhang, Ohzora Hamata, Takuma Akiduki, Tomoaki Mashimo, Taiki Saito, Kazuhiro Hayashi

INTERNATIONAL JOURNAL OF INNOVATIVE COMPUTING INFORMATION AND CONTROL 16 ( 6 ) 2007 - 2019 2020.12

Language：English Publishing type：Research paper (scientific journal) Publisher：ICIC INTERNATIONAL

Bridge inspection is usually done visually on-site, and for this reason is problematic in places inaccessible to inspectors. In this paper we propose a solution through the analysis of features in captured images that suggest potential problems. We focus on the ability to detect cracks, and a complex-valued Haar wavelet is designed and applied to a 2D-CWPT, which is then combined with an anisotropic diffusion filter. A detection method for linear cracks is proposed through interpolation of the crack loss area and extraction processing according to the shape feature. The main results are: 1) we confirm that the complex-valued Haar wavelet is more effective for edge enhancement than the complex-valued Meyer wavelet; 2) quantitative evaluation of the proposed method for crack detection using the correct rate, sensitivity, specificity, precision rate, and F-value confirms the effectiveness of the method.

DOI： 10.24507/ijicic.16.06.2007

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Self-Sensing and Feedback Control for a Twin Coil Spring-Based Flexible Ultrasonic Motor Reviewed

Yunosuke Sato, Ayato Kanada, Tomoaki Mashimo

IEEE Robotics and Automation Letters 5 ( 4 ) 5425 - 5431 2020.10

Linear piezoelectric motor using a hollow rectangular stator Reviewed

Shunsuke Izuhara, Tomoaki Mashimo

Sensors and Actuators A: Physical 309 112002 - 112002 2020.7

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier BV

We propose a linear piezoelectric motor using a hollow rectangular stator that can translate a load placed inside it by a direct-drive. This stator structure enables a quick response and high resolution by few components. These advantages are suited for controlling autofocus and zoom mechanisms in imaging devices. In this study, we verify the feasibility of the driving principle that uses two vibration modes in the bending and longitudinal direction of a hollow rectangular plate. We design a hollow linear piezoelectric motor by a finite element method analysis and evaluate the performance of the prototype motor by experiments. In the prototype motor, the stator measures 60 mm in height and width and 4.1 mm in thickness (the length in slider travel direction), and a slider with a side length of 42 mm is inserted into the stator. The performance parameters of the linear motion, such as thrust force and speed, are evaluated experimentally. By optimizing the preload between the stator and the slider, the motor thrust force has improved to over 0.5 N at 70 Vp-p, which is a practical force for moving a certain lens unit. (C) 2020 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.sna.2020.112002

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Papers - Mashimo Tomoaki