Explanipedia

Special Issue on World BOSAI Forum 2025 Open

Yuichi Ono, Daisuke SASAKI, Yuta Hara · 2025

The World BOSAI Forum 2025 (WBF2025) was successfully convened from March 7 to 9, 2025. According to the event report of the WBF2025 [1], the forum welcomed 5,434 participants over the three days, including 1,197 pre-registered attendees f…

Development of Artificial Rubber Muscle Capable of Human-Like Pulling Motion Open

Jun KADOWAKI, Daisuke SASAKI, Hayato Yase, Kaisei Harada, Shinichiro Shobako · 2025

Wearable power-assisted robots driven by artificial rubber muscles should be designed with a wide range of assistance capabilities to support various tasks while minimizing the sense of restraint when worn. Ideally, to realize a compact an…

Realization of MDOF Soft Actuator Capable of Bending in Arbitrary Directions Open

Teruo Tsuji, Daisuke SASAKI, Jun KADOWAKI, Hayato Yase, Kaisei Harada · 2025

In recent years, soft machine systems that employ soft actuators with high affinity and safety toward humans have attracted attention. The soft actuators developed thus far include those that can extend or bend by only supplying compressed…

Human cardiosphere-derived cells with activated mitochondria for better myocardial regenerative therapy Open

Masahiro Shiraishi, Daisuke SASAKI, Mitsue Hibino, Atsuhito Takeda, Hideyoshi Harashima , et al. · 2024

Cell transplantation is a promising therapeutic strategy for myocardial regeneration therapy. To improve therapeutic effects, we developed a culture medium additive that enhances the mitochondrial function of cardiomyocytes for transplanta…

Development of Artificial Rubber Muscle Capable of Force Transmission Using Belt Open

Takuto MIMA, Jun KADOWAKI, Daisuke SASAKI · 2024

Fundamental Research on Improvement of Force Transmission Characteristics of Artificial Rubber Muscle Capable of Hand-Pring Motion Open

Jun KADOWAKI, Daisuke SASAKI · 2024

Deformation model for hollow cylindrical-shaped variable volume tank Open

Kaisei HARADA, Daisuke SASAKI, Jun KADOWAKI, Hayato YASE · 2024

Recently wearable power assist robots have been developed in order to solve labor shortage and reduce work load. It is desirable that the wearable power assist robots should be lightweight and flexible from the viewpoint of reducing burden…

The Simons Observatory: Cryogenic Half Wave Plate Rotation Mechanism for the Small Aperture Telescopes Open

Kyohei Yamada, Bryce Bixler, Y. Sakurai, Peter Ashton, Junna Sugiyama , et al. · 2023

We present the requirements, design and evaluation of the cryogenic continuously rotating half-wave plate (CHWP) for the Simons Observatory (SO). SO is a cosmic microwave background (CMB) polarization experiment at Parque Astronómico Ataca…

Effect of simple repair using resin on fatigue life of A6063 aluminum alloy with a simulated crack Open

Daisuke SASAKI, Kaishi Naragino, Mochiyuki Yoshitoshi, Toyomitsu HARADA, Makoto Nanko , et al. · 2023

In recent times, the use of aluminum alloys in large-scale structures has been widely advocated. In view of the maintenance and administration of these structures, the implementation of a simple repair methodology holds immense significanc…

Development of Ankle Wearable Device Using Pneumatic Friction Clutch Mechanism Open

Dai KAYAMA, Daisuke SASAKI, Kaisei HARADA, Jun KADOWAKI, Hayato YASE · 2023

The purpose of this study is to develop the ankle wearable device that constructed with artificial muscles and the pneumatic friction clutch to train leg motion directly. The developed clutch is constructed with the air bellows, the fricti…

Control of Bending and Suction Pressure for Pneumatic Multifunctional Soft Hand and Application to Motion Switching Open

Shotaro OTSUKI, Daisuke SASAKI, Kaisei HARADA, Hiromichi KAJIKAWA · 2023

The purpose of this study is to develop a soft robot hand that can grasp an object, which has various shape or characteristic. By combining bending motion of a soft actuator and vacuum suction using a vacuum ejector, the developed finger c…

Development of Multifunctional Soft Robot Hand with Adsorption Function Open

Shotaro OTSUKI, Daisuke SASAKI, Jun KADOWAKI, Hayato YASE, Kaisei HARADA , et al. · 2022

The purpose of this study is to develop a soft robot hand that can grasp any shape or characteristic object due to the expansion of the actuator applied positive pressure and vacuum adsorption due to negative pressure. The actuator made of…

Aerodynamic Analysis of Membrane Wing Airfoil at Low Reynolds Numbers Open

Atsushi NAKAYA, Daisuke SASAKI, Shun Takahashi, Yuki KAWAMOTO · 2022

Mars aircraft has been proposed as a means of extensive Mars exploration. Recent research reveals that membrane wings are effective in obtaining sufficient lift in a compact size. In this study, the aerodynamic analysis was performed by fo…

Grasping Motion Using a Hybrid Type Jamming Transfer Holding Device Open

Hidetoshi KISHIGAMI, Daisuke SASAKI, Jun KADOWAKI, Hayato YASE, Yuki KUROZUMI · 2022

The purpose of this study is to develop a holding device which has versatility and human friendliness. A conventional granular jamming gripper has some technical issues such as difficulty in holding small objects, gravitational influence o…

Preface to Special Issue on the 27th Robotics Symposia Open

Daisuke SASAKI · 2022

McKibben type pneumatic artificial muscle model based on rubber physical characteristics Open

Hayato YASE, Daisuke SASAKI, Jun KADOWAKI, Yusaku BABA · 2022

McKibben type artificial rubber muscle has high affinity with human body due to mechanical flexibility and light-weight. It is widely used for personal care robots as the reason for above. Therefore, several models of artificial muscle bas…

Aerodynamic study of a circular arc airfoil at low Reynolds numbers using Cartesian mesh CFD Open

Takumi TAKASE, Daisuke SASAKI, Masato Okamoto · 2022

The purpose of the study is to investigate the Reynolds number dependency of a circular arc airfoil at Reynolds numbers from 1×103 to 10×103 by CFD. A block-structured Cartesian-mesh CFD was employed to precisely predict the vortex flowfie…

Verification of Characteristics of McKibben Type Artificial Rubber Muscle Considering Material Properties of Muscle End Contact Surface Open

Jun KADOWAKI, Daisuke SASAKI, Hayato YASE · 2022

The purpose of this study is to verify the effect of changing the material of only end on the contraction force characteristics of McKibben type artificial rubber muscle. In previous studies, it was thought that the hysteresis characterist…

Development of Pneumatic Mechanical Elements for Human Assist Device Open

Daisuke SASAKI · 2022

In a pneumatic power assist robot, it has been technical issue that peripheral pneumatic elements such as air source and air valve increase whole weight of air system. Pneumatic mechanical elements had been developed in this study. The dev…

Modeling the hysteresis characteristics of McKibben type artificial rubber muscle based on rubber physical characteristics Open

Jun KADOWAKI, Daisuke SASAKI, Hayato YASE, Taiga Kimura · 2022

In a power assist robot driven with an artificial muscle, an accurate artificial muscle model is required to design a robot. It is desirable that the model can be calculated without adjustment parameters based on the actual characteristics…

Slanted septum and multiple folded cavity liners for broadband sound absorption Open

Suresh Palani, Paul Murray, Alan McAlpine, Daisuke SASAKI, Christoph Richter · 2021

The design of acoustic liners with complex cavities for a wide frequency range of attenuation using numerical method is investigated in this paper. Three novel liner concepts are presented, demonstrating predicted improvements in broadband…

Study of aerodynamic interference between main wing and tail wing using 2D Building-Cube Method Open

Ryuho Kita, Daisuke SASAKI, Yusuke Shikada · 2021

In this study, a two-dimensional compressible block-structured Cartesian mesh CFD solver was used to perform a numerical analysis of the cross-sectional shapes of the NASA-CRM main and tail wings. The purpose is to investigate the influenc…

Development of Pneumatic Variable Friction Dumper to Correct Body Movement Open

Tomoaki KAMIMURA, Daisuke SASAKI, Hayato YASE, Jun KADOWAKI · 2021

In this study, the variable friction dumper driven with pneumatic actuator is developed to correct body movement. The developed device is constructed with friction members which are made with rubber, and pneumatic artificial rubber muscle,…

Wake-Integral Region Estimation Using Deep Learning for Block-Structured Cartesian Mesh. Open

Shohei Nagahashi, Yuta Natsume, Yusuke Shikada, Daisuke SASAKI, Kisa Matsushima · 2021

Cartesian-Mesh CFD solvers have a problem of inaccurate drag force calculation because the grid does not conform to the object. This is attributed to the fact that near-field drag calculations are performed on the surface of the object, wh…

Development of Wearable Device Driven with Pneumatic Soft Actuator for Trunk Rotation Open

Hayato YASE, Daisuke SASAKI, Jun KADOWAKI, Taiga Kimura, Ryutaro Kusaka · 2021

Lack of muscle strength due to aging causes reduction of stable gait motion. Rehabilitation for the recovery of trunk motion during walking and muscle strength are important to obtain stability of walking. In this study, we developed weara…

Study on trunk posture support device utilizing variable stiffness characteristics by pneumatic soft actuator Open

Hayato YASE, Daisuke SASAKI, Jun KADOWAKI, Takumi YASUHARA · 2021

Kyphosis causes decline in respiratory and circulatory functions owing to compresses of internal organs. The purpose of this study is to develop a posture keep assist device. The device is constructed with multiple resin components and McK…

Wake-Integral Region Estimation Using Deep Learning for Block-Structured Cartesian Mesh Open

Yuta Natsume, Shohei Nagahashi, Yusuke Shikada, Daisuke SASAKI, Kisa Matsushima · 2021

Computational Analysis of Supersonic Flow Around a Wedge Using Building-Cube Method Open

Kumpei ABE, Sayaka Miyazaki, Daisuke SASAKI, Shun TAKAHASHI, Gohji YAMADA · 2021

This study was intended to analyze supersonic flows around a wedge by using a block-structured Cartesian Mesh CFD method. The oblique shockwaves were computed by employing different mesh size. Through the comparison of shock angle and pres…

VALIDATION OF SAV MODEL USING LABORATORY EXPERIMENTS Open

Daisuke SASAKI, Hiroki Matsumoto, Keisuke Nakayama, Kazufumi TADA, Hao‐Chi Lin , et al. · 2021

気候変動の緩和策として,海洋生態系の光合成活動によって吸収・貯留される炭素である「ブルーカーボン」が注目されている.ブルーカーボン生態系の1つであるアマモについて,流れの影響を受けて変形すると二酸化炭素吸収効果が大きく変化すると考えられるため,流動が水草に与える影響を詳細に評価する必要がある.このような理由から,個々のアマモを独立したオブジェクトとして定義し,流れ場との相互作用を詳細に再現できる水草モデル(Submerged Aquatic Vegetation model…

Multi-objective design optimization of DESTINY<sup>+</sup> spiral trajectory in consideration of the diversity of launch date and time Open

Haruka INAZUKA, Daisuke SASAKI, Akira Oyama, Takayuki Yamamoto · 2021

DESTINY+ (Demonstration and Experiment of Space Technology for INterplanetary voYage, Phaethon fLyby and dUSt analysis) is a small-sized high-performance deep space vehicle proposed by ISAS/JAXA. The mission of DESTINY+ is “Acquisition of …

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