The Experts below are selected from a list of 1545 Experts worldwide ranked by ideXlab platform
Koichi Suzumori - One of the best experts on this subject based on the ideXlab platform.
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New Pneumatic Rubber Leg Mechanism for Omnidirectional Locomotion
International journal of automation technology, 2014Co-Authors: Mohamed Najib Ribuan, Koichi Suzumori, Shuichi WakimotoAbstract:This paper describes a new pneumatic Rubber leg mechanism for omnidirectional locomotion. The new mechanism was adopted from a pneumatic balloon actuator where translation and bending motions are produced as a result of balloon deformation. It was constructed using five chambers: one on the top and centered over four bottom chambers arranged in a square. Several possible designs were simulated to achieve the optimal design using a non-linear finite element analysis that considered the design parameters and the geometrical and material non-linearity of the elements. Prototyping was then performed using a rapid and efficient silicone Rubber Molding fabrication process based on computer-aided design and manufacturing. The experimental results were in good agreement with the analytical results. In conclusion, we have established a new Rubber leg mechanism with a high degree of freedom to realize omnidirectional locomotion for a soft robot base, delicate object conveyance, and / or microscope stage applications.
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Micro Rubber Structures for Passive Walking
Journal of robotics and mechatronics, 2010Co-Authors: Koichi Suzumori, Fumitaka SaitoAbstract:The final goal of this work is the development of functional Rubber sheets with micro Rubber structures such as friction free, adhesion, and impact adsorption Rubbers, etc. We report a micro Rubber structure that can successfully perform flexible passive walking with 3 V-shaped units consisting of 4 legs to achieve very low friction. We show how to miniaturize and integrate this structure to produce, by means of a micro Rubber Molding process using the stereo lithography method, a Rubber sheet with 64 legs. The prototype is designed, fabricated, and tested. Under certain conditions, the 64-legged Rubber sheet successfully realizes flexible passive walking down an incline.
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Fabrication and evaluation of various types of micro one-way valves through micro Rubber Molding process
Journal of Mechanical Science and Technology, 2010Co-Authors: Yuki Uohashi, Koichi Suzumori, Hironari TaniguchiAbstract:In recent years, research and development on micro fluid systems has become active in the fields of chemical technology and biotechnology. For the realization of these micro fluid systems, micro fluid devices such as micro-valves and micro pumps are very important. This paper reports the fabrication and experimental evaluation of several micro one-way valves. The valves are fabricated through a micro Molding process, which makes the fabrication process simple and suitable for mass production. The experimental results indicate that the developed valve has great performance with a normal flow rate of 130.2 ml/min and a leak flow of 2.2 ml/min. The normal flow rate is 1.4 times higher than that of the previous model.
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IROS - Micro Rubber structure realizing multi-legged passive walking -integration and miniaturization by micro Rubber Molding process-
2009 IEEE RSJ International Conference on Intelligent Robots and Systems, 2009Co-Authors: Fumitaka Saito, Koichi SuzumoriAbstract:The final goal of this work is the development of functional Rubber sheets with micro Rubber structure such as friction free, adhesion, and impact adsorption Rubbers, etc. In the previous report, we reported a micro Rubber structure realizing flexible passive walking with 3 v-shaped units consisting of 4 legs to achieve very low friction. In this second report, we show the miniaturization and integration of this structure to realize a Rubber sheet with 64 legs by micro Rubber Molding process using stereo lithography method. The prototype is designed and fabricated, and tested. Under some conditions, the 64 legged Rubber sheet realizes flexible passive walking on a sloping road successfully.
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ICRA - Miniature soft hand with curling Rubber pneumatic actuators
2009 IEEE International Conference on Robotics and Automation, 2009Co-Authors: Shuichi Wakimoto, Koichi Suzumori, Keiko Ogura, Yasutaka NishiokaAbstract:In medical and biotechnology fields, soft devices are required because of their high safety from low mechanical impedance. FMA (Flexible Microactuator) is one of the typical soft actuators. It consists of fiber-reinforced Rubber structure with multi air chambers and realizes bending motion pneumatically. It has been applied to robot hands, robot legs and so on. High potential of FMA has been confirmed by many experiments reported in several papers. However in fabrication process of the actuator, it is difficult to embed the reinforced fiber in the Rubber structure. In this study, we aim at development of a fiber less FMA realizing quite large motion, which can be said curling motion, and a soft hand using the actuators. We design the actuator without fiber using nonlinear FEM (Finite Element Method) and derived efficient shape. The actuator is fabricated through micro Rubber casting process including micro machining process for molds, micro vacuum Rubber Molding process and Rubber bonding process with surface improvement by excimer light. Basic driving experiments of the actuator showed that it realized curling motion which agreed well with FEM results. And the actuator could grasp a fish egg without breaking. Additionally, we made a soft hand consisting of three curling actuators. This hand also could be manufactured by simple casting process. The developed hand works opening and closing motions well.
Chee Kai Chua - One of the best experts on this subject based on the ideXlab platform.
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gas turbine blade manufacturing by use of epoxy resin tooling and silicone Rubber Molding techniques
Rapid Prototyping Journal, 2011Co-Authors: Mohammad Vaezi, Davood Safaeia, Chee Kai ChuaAbstract:Purpose – Conventional investment casting of turbine blades is a time consuming and expensive process due to the complications in wax injection steps and the complex shape of airfoil surfaces. By using rapid investment casting, a substantial improvement in the gas turbine blade manufacturing process can be expected. However, this process needs to be able to compete with conventional investment casting from a dimensional accuracy view of point. The purpose of this paper is to investigate the manufacture of gas turbine blades via two indirect rapid tooling (RT) technologies, namely epoxy (EP) resin tooling and silicon Rubber Molding.Design/methodology/approach – The second stage blade of a Ruston TA 1750 gas turbine (rated at 1.3 MW) was digitized by a coordinate measuring machine. The aluminum‐filled EP resin and silicon Rubber molds were fabricated using StereoLithography master models. Several wax patterns were made by injection in the EP resin and silicone Rubber molds. These wax patterns were utilized ...
Mohammad Vaezi - One of the best experts on this subject based on the ideXlab platform.
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gas turbine blade manufacturing by use of epoxy resin tooling and silicone Rubber Molding techniques
Rapid Prototyping Journal, 2011Co-Authors: Mohammad Vaezi, Davood Safaeia, Chee Kai ChuaAbstract:Purpose – Conventional investment casting of turbine blades is a time consuming and expensive process due to the complications in wax injection steps and the complex shape of airfoil surfaces. By using rapid investment casting, a substantial improvement in the gas turbine blade manufacturing process can be expected. However, this process needs to be able to compete with conventional investment casting from a dimensional accuracy view of point. The purpose of this paper is to investigate the manufacture of gas turbine blades via two indirect rapid tooling (RT) technologies, namely epoxy (EP) resin tooling and silicon Rubber Molding.Design/methodology/approach – The second stage blade of a Ruston TA 1750 gas turbine (rated at 1.3 MW) was digitized by a coordinate measuring machine. The aluminum‐filled EP resin and silicon Rubber molds were fabricated using StereoLithography master models. Several wax patterns were made by injection in the EP resin and silicone Rubber molds. These wax patterns were utilized ...
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Investment casting of gas turbine blade by used of rapid technologies
2009Co-Authors: Davood Safaeian, Mohammad VaeziAbstract:This study has investigated the ability of two different rapid technologies, namely, MultiJet Modeling (MJM) and silicone Rubber Molding to manufacture investment casting pattern of gas turbine blade. For this reason, the second stage blade of Ruston TA 1750 (1.3MW) gas turbine was digitized using CMM and then its wax pattern manufactured by MJM technology and silicone Rubber Molding technique. Regarding the inspection results of manufactured patterns, maximum deviation of MJM pattern was -0.111mm. While for pattern fabricated using silicone Rubber Molding, maximum deviation was +0.298 mm. Considering results of this experimental research, both techniques are usable to manufacture expendable pattern of gas turbine blade but in terms of part accuracy, silicone Rubber Molding is not successful approach for manufacturing of blade expendable patterns. MJM technology enjoys more dimensional accuracy as well as more ability compare with silicone Rubber Molding technique.
Fumitaka Saito - One of the best experts on this subject based on the ideXlab platform.
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Micro Rubber Structures for Passive Walking
Journal of robotics and mechatronics, 2010Co-Authors: Koichi Suzumori, Fumitaka SaitoAbstract:The final goal of this work is the development of functional Rubber sheets with micro Rubber structures such as friction free, adhesion, and impact adsorption Rubbers, etc. We report a micro Rubber structure that can successfully perform flexible passive walking with 3 V-shaped units consisting of 4 legs to achieve very low friction. We show how to miniaturize and integrate this structure to produce, by means of a micro Rubber Molding process using the stereo lithography method, a Rubber sheet with 64 legs. The prototype is designed, fabricated, and tested. Under certain conditions, the 64-legged Rubber sheet successfully realizes flexible passive walking down an incline.
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IROS - Micro Rubber structure realizing multi-legged passive walking -integration and miniaturization by micro Rubber Molding process-
2009 IEEE RSJ International Conference on Intelligent Robots and Systems, 2009Co-Authors: Fumitaka Saito, Koichi SuzumoriAbstract:The final goal of this work is the development of functional Rubber sheets with micro Rubber structure such as friction free, adhesion, and impact adsorption Rubbers, etc. In the previous report, we reported a micro Rubber structure realizing flexible passive walking with 3 v-shaped units consisting of 4 legs to achieve very low friction. In this second report, we show the miniaturization and integration of this structure to realize a Rubber sheet with 64 legs by micro Rubber Molding process using stereo lithography method. The prototype is designed and fabricated, and tested. Under some conditions, the 64 legged Rubber sheet realizes flexible passive walking on a sloping road successfully.
Tim C Lueth - One of the best experts on this subject based on the ideXlab platform.
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A 3D-printed functioning anatomical human middle ear model
Hearing Research, 2016Co-Authors: Ismail Kuru, Thomas Lenarz, Hannes Maier, Mathias Muller, Tim C LuethAbstract:The middle ear is a sophisticated and complex structure with a variety of functions, yet a delicate organ prone to injuries due to various reasons. Both, understanding and reconstructing its functions has always been an important topic for researchers from medical and technical background. Currently, human temporal bones are generally used as model for tests, experiments and validation of the numerical results. However, fresh human preparations are not always easily accessible and their mechanical properties vary with time and between individuals. Therefore we have built an anatomically based and functional middle ear model to serve as a reproducible test environment. Our middle ear model was manufactured with the aid of 3D-printing technology. We have segmented the essential functional elements from micro computed tomography data (μCT) of a single temporal bone. The ossicles were 3D-printed by selective laser melting (SLM) and the soft tissues were casted with silicone Rubber into 3D-printed molds. The ear canal, the tympanic cavity and the inner ear were artificially designed, but their design ensured the anatomically correct position of the tympanic membrane, ossicular ligaments and the oval window. For the determination of their auditory properties we have conducted two kinds of tests: measurement of the stapes footplate response to sound and tympanometry of the model. Our experiments regarding the sound transmission showed that the model has a similar behavior to a human middle ear. The transfer function has a resonance frequency at around 1 kHz, the stapes’ response is almost constant for frequencies below the resonance and a roll-off is observed above the resonance. The tympanometry results show that the compliance of the middle ear model is similar to the compliance of a healthy human middle ear. We also present that we were able to manipulate the transmission behavior, so that healthy or pathological scenarios can be created. For this purpose we have built models with different mechanical properties by varying the hardness of the silicone Rubber used for different structures, such as tympanic membrane, oval window and ossicle attachments in the range of Shore 10–40 A. This allowed us to set the transmission amplitudes in the plateau region higher, lower or within the tolerances of normal middle ears (Rosowski et al., 2007). Our results showed that it is possible to build an artificial model of the human middle ear by using 3D-printing technology in combination with silicone Rubber Molding. We were able to reproduce the anatomical shape of the middle ear's essential elements with high accuracy and also assemble them into a functioning middle ear model. The acoustic behavior of the model can be reproduced and manipulated by the choice of material. If the issues such as resonance of the casing and steep roll-off slope in higher frequencies can be solved, this model creates a reproducible environment for experiments and can be useful for the evaluation of prosthetic devices.
