Faculty Profiles - YAMAGUCHI Daisuke

Papers - YAMAGUCHI Daisuke

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Length Estimation of Pneumatic Artificial Muscle with Optical Fiber Sensor Using Machine Learning Reviewed

Yilei Ni, Shuichi Wakimoto, Weihang Tian, Yuichiro Toda, Takefumi Kanda, Daisuke Yamaguchi

Sensors 25 ( 7 ) 2221 - 2221 2025.4

Language：English Publishing type：Research paper (scientific journal) Publisher：MDPI AG

A McKibben artificial muscle is a soft actuator driven by air pressure, characterized by its flexibility, lightweight design, and high power-to-weight ratio. We have developed a smart artificial muscle that is capable of sensing its motion. To enable this sensing function, an optical fiber was integrated into the sleeve consisting of multiple fibers and serving as a component of the McKibben artificial muscle. By measuring the macrobending loss of the optical fiber, the length of the smart artificial muscle is expected to be estimated. However, experimental results indicated that the sensor’s characteristics depend not only on the length but also on the load and the applied air pressure. This dependency arises because the stress applied to the optical fiber increases, causing microbending loss. In this study, we employed a machine learning model, primarily composed of Long Short-Term Memory (LSTM) neural networks, to estimate the length of the smart artificial muscle. The experimental results demonstrate that the length estimation obtained through machine learning exhibits a smaller error. This suggests that machine learning is a feasible approach to enhancing the length measurement accuracy of the smart artificial muscle.

DOI： 10.3390/s25072221

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Temperature Control Condition of Droplet in Nanoparticle Generation System Reviewed

Koki Okamoto, Takefumi Kanda, Naoki Kawamoto, Nozomu Fujimoto, Shuichi Wakimoto, Daisuke Yamaguchi, Yusaku Sakata, Norihisa Seno, Yoshiaki Nakazaki, Takafumi Otoyama

IEEJ Transactions on Sensors and Micromachines 144 ( 6 ) 141 - 148 2024.6

Development of a smart artificial muscle using optical fibres Reviewed

Weihang Tian, Shuichi Wakimoto, Daisuke Yamaguchi, Takefumi Kanda

Smart Materials and Structures 33 ( 5 ) 055047 - 055047 2024.4

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

Abstract

A McKibben artificial muscle is a fluid-driven soft actuator comprising sleeve fibres and rubber tube. However, as typical bulky and rigid displacement sensors are unsuitable as sensor elements in soft actuators, displacement sensing is challenging for the McKibben artificial muscle. Therefore, we propose an optical fibre-based smart artificial muscle (OSAM) to estimate self-displacement from the bending loss of the optical fibre used as the sleeve fibre. The optical fibre can be effortlessly integrated into the OSAM sleeve using a braiding machine, which is generally used for manufacturing strings, easing the mass production process. The radius of curvature of the optical fibre changed when the OSAM was driven. The displacement of the artificial muscle was estimated based on the sensor output. To demonstrate the usefulness of OSAM, displacement feedback control experiments were conducted using the optical fibre sensor integrated into OSAM. From the results, OSAM’s displacement showed a good response to the target displacement. Therefore, the developed artificial muscle can facilitate displacement feedback control without requiring external sensors, which in turn can improve the performance of rehabilitation and wearable devices.

DOI： 10.1088/1361-665x/ad3ec9

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Other Link： https://iopscience.iop.org/article/10.1088/1361-665X/ad3ec9/pdf

Fabrication Process for Twisting Artificial Muscles by Utilizing Braiding Technology and Water-Soluble Fibers Reviewed

Weihang Tian, Shuichi Wakimoto, Daisuke Yamaguchi, Takefumi Kanda

IEEE Robotics and Automation Letters 9 ( 4 ) 3147 - 3154 2024.4

Texturing to Dramatically Increase Thermal Deformation of Bilayer Film and Application to Actuator Reviewed

Daisuke Yamaguchi, Yuki Takahara, Shuichi Wakimoto, Takefumi Kanda

IEEJ Transactions on Electrical and Electronic Engineering 19 ( 5 ) 882 - 887 2024.3

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

The effect of adding texture to increase the deformation of a bilayer actuator by a factor of over 100 was demonstrated. A bilayer actuator is driven by the difference in thermal deformation. Therefore, two films or plates with a large difference in thermal expansion coefficient are required. The newly developed textured film actuator (TFA) obtained large deformation even in a case involving a combination of two films with a small difference in thermal expansion coefficient. The TFA was fabricated by transferring the texture when laminating two PI films with different coefficients of thermal expansion. A TFA with thin‐film electrodes was heated by applying electric power. Thereby, it unfolded from a curled state. The maximum generated force and curvature of the TFA were 7.4 mN and 0.19 mm⁻¹, respectively, at 0.38 W. The manufacturing process for the TFA is simple and convenient, as it does not require adhesives or special materials. In thermal drive bilayer actuator fabrication, the range of material selection is expanded substantially. In addition, large deformations are generated with less energy. Therefore, the energy consumption is likely to be reduced. © 2024 Institute of Electrical Engineer of Japan and Wiley Periodicals LLC.

DOI： 10.1002/tee.24056

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A Microchannel Device for Droplet Classification by Manipulation Using Piezoelectric Vibrator Reviewed

Ao Fujioka, Shoko Seo, Takefumi Kanda, Shuichi Wakimoto, Daisuke Yamaguchi

Actuators 13 ( 3 ) 95 - 95 2024.2

Language：English Publishing type：Research paper (scientific journal) Publisher：MDPI AG

Emulsion formulations should be monodispersed in terms of their stability. Therefore, there is a need for a device that can classify droplets of the desired size from polydispersed emulsions in a fluidized bed manufacturing system. In the previous study, we evaluated the fabrication of a droplet manipulation device using acoustic radiation forces through simulation using the finite element method. In this study, particle manipulation experiments using 1, 6, and 10 µm polystyrene particles were first estimated and evaluated in comparison with their theoretical particle behavior. Based on the results we obtained, the driving conditions and droplet behavior were derived, and the droplet manipulation device using ultrasonic waves to shrink monodisperse emulsions was evaluated. As a result, the droplet classification effect in the microchannel was confirmed to be consistent with the droplet behavior prediction, and the microchannel structure with a constriction component improved its classification effect.

DOI： 10.3390/act13030095

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Evaluation of transducer for cryogenic actuators by equivalent circuit model Reviewed

Kazuki Kubo, Kairi Yagi, Takefumi Kanda, Koa Yasuda, Daisuke Yamaguchi, Shuichi Wakimoto

Japanese Journal of Applied Physics 63 ( 3 ) 03SP03 - 03SP03 2024.2

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

Abstract

Cryogenic environments are increasingly used in scientific and industrial fields. Recently, cryogenic environments are also used for storage and supply of liquid hydrogen, which is considered essential for the realization of a decarbonized society. Actuators to drive a valve that controls such a low-temperature fluid are required. In this study, a piezoelectric transducer that can be driven in the cryogenic environment has been fabricated and evaluated. Although the performance of piezoelectric elements degrades at cryogenic temperatures in general, the application of a preload can suppress the degradation of performance. Equivalent circuits were used for evaluation, and force factors and figures of merit were compared. As a result, the force factor was as high as that at RT even at cryogenic temperatures, and a high figure of merit was obtained. The result indicates that the transducer can be used for the driving of micro actuator at cryogenic temperature.

DOI： 10.35848/1347-4065/ad1e9b

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Other Link： https://iopscience.iop.org/article/10.35848/1347-4065/ad1e9b/pdf

Displacement Sensing of an Active String Actuator Using a Step-Index Multimode Optical Fiber Sensor Reviewed

Weihang Tian, Shuichi Wakimoto, Takefumi Kanda, Daisuke Yamaguchi

Sensors 22 ( 9 ) 3232 - 3232 2022.4

Language：English Publishing type：Research paper (scientific journal) Publisher：MDPI AG

A thin McKibben artificial muscle is a pneumatic actuator with an outer diameter of only 1.8 mm. We fabricated a string-shaped actuator called an “active string actuator,” which achieves a high contractile displacement by accumulating thin McKibben artificial muscles. To control the displacement, the length of the active string actuator should be estimated. However, this is difficult because bulky and rigid sensors are unsuitable for the sensor element of the active string actuator. Therefore, in this study, we propose a new sensing method for estimating the length of an active string actuator. The proposed sensing system is simple and comprises only three components: a step-index multimode optical fiber, a light emitter, and a light receiver. A step-index multimode optical fiber was combined with the active string actuator, and the length was estimated from the change in the amount of light propagating in the optical fiber when the active string actuator was driven. Fundamental experiments were conducted in this study, and the results demonstrated that the optical fiber sensor value changed with the actuator length. This suggests that it is possible to estimate the displacement of an active string actuator using an optical fiber sensor.

DOI： 10.3390/s22093232

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Fabrication of a Polyimide Film Pneumatic Actuator by Molding and Welding Processes Reviewed

Daisuke Yamaguchi, Tatsuya Hanaki, Yuji Ishino, Masaya Takasaki, Takeshi Mizuno

Actuators 10 ( 8 ) 177(1) - 177(14) 2021.7

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Publisher：MDPI AG

The bellows pneumatic actuator, which is made by folding a non-stretch film, has been proposed for various applications because it is easy to fabricate and is extremely thin and light. However, it has subpar durability performance, especially in the folded part of the film. In this study, we propose an actuator with a pod structure that possesses high design flexibility and is free from folding. A method of molding a pod structure on a polyimide film was established and a pneumatic actuator was successfully fabricated by using PI films. Two types of PI film pneumatic actuators with the same curvature, bellows type, and pod type were fabricated. Both were confirmed to have equivalent output characteristics. The bending angle and generated torque of the pod-structure actuator were 34° and 3.3 mNm, respectively. In addition, the pod structure has approximately twice the durability of the bellows structure. By using the fabrication method proposed in this paper, it is possible to realize an air chamber (i.e., an actuator) that has both high durability and bending motion.

DOI： 10.3390/act10080177

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Stabilization of magnetic suspension system by a reset element (Adjustment of vibration attenuation characteristic) Reviewed

Yuji ISHINO, Takeshi MIZUNO, Masaya TAKASAKI, Daisuke YAMAGUCHI

Transactions of the JSME (in Japanese) 86 ( 891 ) 20 - 00015 2020.11

Concept and Prototype of Soft Actuator for Liquid Nitrogen Temperature Environments Reviewed

Daisuke Yamaguchi, Tatsuya Hanaki, Yuji Ishino, Masayuki Hara, Masaya Takasaki, Takeshi Mizuno

Journal of Robotics and Mechatronics 32 ( 5 ) 1019 - 1026 2020.10

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Publisher：Fuji Technology Press Ltd.

A prototype of a soft actuator for extreme environments was fabricated, and driven in a cryogenic temperature environment. Previous soft actuators cannot be used for robots in extreme environments because resin, the main fabrication material, exhibits weak environmental characteristics. Therefore, this study proposes the application of polyimide (PI) films to soft actuators. PI is characterized by excellent environmental resistance. However, the welding of PI is difficult because of its high resistance. In this study, a welding method was developed for PI films. This method does not require pretreatment, or the use of adhesives or additives to reduce resistance. Hence, an actuator that utilizes all the characteristics of PI was realized. The actuator was characterized in a cryogenic environment, which is one of the extreme environments, and was successfully driven at a liquid nitrogen temperature of 78 K. This proposed technology is not limited to cryogenic environments and is expected to provide extreme environmental resistance to existing soft robots.

DOI： 10.20965/jrm.2020.p1019

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Suspension Characteristics of Differentially Operated AC Magnetic Suspension System Using Magnetic Resonant Coupling Reviewed

Arifur RAHMAN, Takeshi MIZUNO, Yuji ISHINO, Masaya TAKASAKI, Daisuke YAMAGUCHI

Journal of the Japan Society of Applied Electromagnetics and Mechanics 28 ( 2 ) 94 - 100 2020.10

Development of bilateral operation system for the assembly of magnetized components Reviewed

Ryu MONJIYAMA, Takeshi MIZUNO, Yuji ISHINO, Masaya TAKASAKI, Daisuke YAMAGUCHI

Transactions of the JSME (in Japanese) 86 ( 888 ) 20 - 00004 2020.8

Vibration control of cryopump with an active dynamic vibration absorber Reviewed

T. Mizuno, T. IIda, Y. Ishino, M. Takasaki, M. Hara, D. Yamaguchi, T. Kano

Transactions of the JSME 85 ( 873 ) 18-00461 2019.5

Realization of Stable Trajectory in Mass Measurement System Using Relay Feedback of Velocity and Restoring Force Compensation Reviewed

T. Mizuno, K. Nishizawa, M. Takasaki, Y Ishino, M. Hara, D. Yamaguchi

SICE Journal of Control, Measurement, and System Integration 12 ( 3 ) 68 - 75 2019.5

Stabilization of Magnetic Suspension System by Using Only a First-Order Reset Element without a Derivative Element Reviewed

Yuji Ishino, Takeshi Mizuno, Masaya Takasaki, Daisuke Yamaguchi

Actuators 8 ( 1 ) 24 - 24 2019.3

Language：English Publishing type：Research paper (scientific journal) Publisher：MDPI AG

The stabilization of a magnetic suspension system is achieved by using a low-pass filter (LPF) with a nonlinear integrator without any other element. A proportional-derivative (PD) control is commonly used as the simplest method of stabilizing a magnetic suspension system. Meanwhile, a first-order reset element (FORE) was applied to improve transient characteristics. The original FORE was a first-order LPF with a nonlinear reset integrator element. A magnetic suspension system cannot be stabilized by a linear LPF, nor the original FORE. In this work, the reset conditions of the FORE were modified for magnetic suspension. This modified FORE succeeded in stabilizing a magnetic suspension system. The efficacy of the modified FORE was demonstrated by simulations and experiments. A single degree of freedom magnetic suspension system was used in the experiment.

DOI： 10.3390/act8010024

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Modeling and Validation of Vertical Direction Force Estimation with a Three-Dimensional Force Measurement Instrument Based on a Zero-Compliance Mechanism Reviewed

Md Nahiyan, Takeshi Mizuno, Masaya Takasaki, Yuji Ishino, Masayuki Hara, Daisuke Yamaguchi

Sensors 19 ( 4 ) 799 - 799 2019.2

Design and control of active vibration isolation system with an active dynamic vibration absorber operating as accelerometer Reviewed

Syed Mamun R Rasid, Takeshi Mizuno, Yuji Ishino, Masaya Takasaki, Masayuki Hara, Daisuke Yamaguchi

Journal of Sound and Vibration 438 175 - 190 2019.1

Lateral vibration suppression by varying stiffness control in a vertically active magnetic suspension system Reviewed

Asief Javed, Takeshi Mizuno, Masaya Takasaki, Yuji Ishino, Masayuki Hara, Daisuke Yamaguchi

Actuators 7 ( 2 ) 1 - 13 2018.6

Force Measurement Using Zero-Compliance Mechanism Reviewed

Takeshi MIZUNO, Yuji ISHINO, Hiroki KAWADA, Yoichiro HAYASHI, Masaya TAKASAKI, Masayuki HARA, Daisuke YAMAGUCHI

SICE Journal of Control, Measurement, and System Integration 11 ( 4 ) 341 - 348 2018.6

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Papers - YAMAGUCHI Daisuke