Takeshi Mizuno

Takeshi Mizuno
Saitama University · Department of Mechanical Engineering

Doctor of Engineering

About

482
Publications
18,931
Reads
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2,027
Citations
Citations since 2016
99 Research Items
732 Citations
2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
Introduction
He is a Professor and the Department Chair of Mechanical Engineering, Saitama University in Saitama, Japan. He received the B.E., M.E., and D.E. degrees from the University of Tokyo in 1978, 1980 and 1985, respectively. He was a Research Associate at the Institute of Industrial Science, the University of Tokyo from 1980 to 1985, and an Assistant Professor at the Polytech University from 1985 to 1988. Since 1988, he has been with the Department of Mechanical Engineering, Saitama University.
Additional affiliations
April 1988 - present
Saitama University
Position
  • Professor (Full)

Publications

Publications (482)
Article
Full-text available
A three-degree-of-freedom AC magnetic suspension system using magnetic resonant coupling was fabricated. The AC magnetic suspension system can produce restoring force without active control. This system is dynamically stabilized by adding indirect damping, which is produced by suspending to the stator with viscoelastic support mechanisms. A non-con...
Article
Full-text available
The rubber hand illusion (RHI) is an illusory experience in which a fake rubber hand is felt as if it were one’s own hand when the visible fake and invisible real hands are stimulated synchronously. Although several studies have suggested contributions of action to body ownership using the RHI paradigm, the relationship between body ownership and a...
Article
Full-text available
This paper presents the isolation of vibration through the acceleration feedback of the Kalman filter. In this paper, vibration isolation was analyzed both analytically and experimentally through the estimation of the Kalman filter (KF). A negative stiffness mechanism was used to reduce the level of vibration for the developed dynamic system. The t...
Article
A mass measurement system with a relay feedback of velocity has been developed to achieve measurement without gravity. In this system, mass is estimated from the periods of oscillation in the relay-feedback system. Originally, the velocity of the object was solely fed back, which caused the orbit of the object to drift easily. A restoring force com...
Article
A miniaturized force measurement device with zero-compliance mechanism is designed and fabricated using MEMS technology. Zero-compliance mechanism consists of two suspensions connected in series through a detection point. When a force is applied to an object suspended by this mechanism, the position of the object can be kept constant by controlling...
Article
Full-text available
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 h...
Article
Full-text available
Mass measurement using relay feedback of velocity and restoring force compensation is investigated for determining the mass of an object under weightless conditions. In the measurement system, the velocity of the object is fed back through a relay with hysteresis and the force acting on the object is switched from a positive value to a negative val...
Article
Click sensation is the feedback by sound and haptic feeling during pressing down an input device such as a button or a switch. In our daily lives, perceiving a click sensation causes us to recognize completion of an operation. Recently, however, input devices using touch screens, such as smartphones, have become widespread, and these devices do not...
Article
An interaction through a negative-stiffness spring is introduced into a dual-mass dynamic vibration absorber (DVA) to lower its resonance frequency. DVA is one of the practical vibration control devices. In principles, it consists of an absorption mass and a spring. It can eliminate vibration at a specified frequency that equals the resonance frequ...
Article
A newly developed AC magnetic suspension system is designed and fabricated to investigate the performances. A new concept of design is revealed for operating the apparatus differentially where the floator is kept at a constant position despite changing the parameters of the upper stator electromagnets. An extensive finite element analysis is conduc...
Article
In order to apply soft actuators to extreme environments, the actuators mainly composed of polyimide (PI) was developed. Previous PI film actuators had problems with the life of repeated operation and the difficulty of manufacturing. To solve these problems, a soft actuator was fabricated by using a heat compressed air molding of PI films. By press...
Article
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 (P...
Article
A first-order-reset element (FORE) controller is modified to adjust the vibration attenuation characteristic of a magnetic suspension system. The proportional-derivative (PD) feedback control is the simplest control method of stabilizing magnetic suspension systems. In the PD-controlled system, restoring force is produced with the proportional elem...
Article
One of the practical vibration control devices is dynamic vibration absorber (DVA). In principles it consists of an absorption mass and a spring. It can eliminate vibration at a specified frequency that equals the resonant frequency of DVA. To eliminate low frequency vibration, it is necessary to increase the absorption mass or lower the spring con...
Article
A magnetic suspension system using rotational flux-path control mechanism is developed. In the developed fluxpath control mechanism, a pair of gear-shaped flux control plates are attached to the top and bottom of a permanent magnet (magnetic source); they are surrounded by a ferromagnetic outer yoke with teeth facing the control plates. The gear-sh...
Article
Full-text available
An AC magnetic suspension system operated differentially has been designed and developed to investigate the characteristics of AC magnetic suspension using magnetic resonance coupling. This device enables the floator to keep a constant position despite changing the parameters of the stator electromagnets by differential operation. A permanent magne...
Article
In the assembly of micro components, a slight impact during assembly affects product performance. This work focuses on the assembly of parts including magnetized components. In the assembly of such parts, the attractive force acting between the parts causes a difficulty of assembly without collision. For this reason, such a work is conducted by ski...
Article
Full-text available
The fundamental characteristics and performances of alternating current (AC) magnetic suspension using magnetic resonant coupling are studied analytically and experimentally. Nowadays, wireless power transfer to the suspended object is required during non-contact suspension in some applications. Therefore, magnetic resonant coupling has been introd...
Article
In near-field levitation, an object can be levitated vertically upward above vibrating surface of an ultrasonic transducer. On the other hand, it has been reported that an object can be suspended vertically downward under the vibrating surface in the air. We call this phenomenon ultrasonic suspension. However, there is no detailed explanation about...
Article
A multi-degree-of-freedom zero-compliance mechanism is developed for measuring micro force with a cantilever. The force acting on a tip of the cantilever is usually estimated from the displacement of the tip caused by the force. However, the position and attitude of the tip vary after force acts on the tip from the original ones. To keep them invar...
Article
Accelerometer using zero-compliance mechanism is proposed. The zero-compliance mechanism is a series connection of a positive-stiffness suspension and a negative-stiffness suspension with the same amplitude of stiffness. In the proposed accelerometer, an inertial mass is suspended with this mechanism. Force acting on the inertial mass is proportion...
Article
The insertion of elastic ferromagnetic substance into the gap has been proposed to increase the attractive force of a magnetic suspension for vibration isolation system. The vibration isolation system with a series connection of a positive-stiffness and a negative-stiffness suspensions (zero-compliance vibration isolation system) has been studied e...
Article
A mass measurement system using relay feedback of velocity was developed. In this system, the velocity of the object was fed back through a relay with hysteresis. Although the efficacy of the proposed method has been already confirmed experimentally, it was subject to a drift mainly because only the velocity was fed back. To prevent such a drift, a...
Article
A vibration isolation device with an active dynamic vibration absorber is developed to remove vibration induced by a cryopump. Cryopump is used to make high-vacuum and low-temperature environments for precise measurement. However, it induces vibrations with multiple frequencies, which may deteriorate measurement accuracy. This study focuses on remo...
Article
Full-text available
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 transie...
Article
Full-text available
The principle of a zero-compliance mechanism was used to develop a three-dimensional force measurement instrument. In each axis, the point of force is suspended by a zero-compliance mechanism. A vertical axis force estimation operation imitates the structure of a double series magnetic suspension system. An electromagnet directly controls the movem...
Article
An active dynamic vibration absorber is introduced to a cyropump system achieving ultra-high vacuum and extremely low temperature environments for fine observation and high-accuracy measurement. In a cryopump, a so-called displacer moves reciprocally for alternative adiabatic expansion and exhaust of helium gas. Such a motion induces vibration in t...
Article
A vibration reducing effect of a magnetic suspension system using a first-order-reset element (FORE) in the controller is enhanced by a modified reset function. The proportional-derivative (PD) feedback control is the simplest control method of stabilizing the magnetic suspension systems which consists of two elements. In the PD-controlled systems,...
Article
A 3-degree-of-freedom zero-compliance mechanism is applied to a force measurement device using a cantilever. Force measurement using a cantilever has advantages of high resolution because of the low stiffness of the cantilever. However, it has a problem that the measurement conditions change because the point of force is displaced when force acts o...
Article
In the assembly of micro components, a slight impact during assembly greatly affects product performance. This work focuses on the assembly of parts including magnetized components. In the assembly of such parts, the attractive force acting between the parts causes a difficulty of assembly without collision. For this reason, such a work is conducte...
Article
The world's smallest moon lander (OMOTENASHI) will be launched by NASA's space launch system. The lander impacts to the moon at 100km/h. The landing impact is absorbed by crushable materials and an airbag consisted of an external cover and an air chamber made by polyimide films. However, the coexistence of tough glued strength and lightweight will...
Article
When a ferromagnetic object in a vacuum chamber or a container filled with liquid is suspended magneticaly, it is difficult to measure the displacement of the ferromagnetic object from the outside of the container with an eddy current sensor or an optical sensor. This study proposes to apply sensorless series double magnetic suspension to cope with...
Article
A variable stiffness element made of polyimide (PI) films was developed. The element is composed of laminated PI films and a PI balloon. Variable stiffness is realized by jamming transition. Jamming transition change a state of elements inside a balloon from a fluid to a solid by decreasing the internal pressure of the element, and variable stiffne...
Article
An existing laterally control flux-path mechanism has a seesaw mechanism to move a flux-path control plate. Therefore, the size of the apparatus is rather large. To reduce a size of suspension system, a novel flux-path control mechanism is proposed which adjusts the flux reaching the floator by rotational motion mechanism. The principle of the adju...
Article
This paper deals with a single-axis zero-compliance horizontal system in which the displacement cancellation technique has been employed to develop the system. The both theoretical and experimental analyses regarding the developed system have been conducted. The displacement cancellation technique possesses the characteristic of zero-compliance in...
Article
People have strong tickling sensation when someone touches sensitive body-parts (e.g., neck, ribs) although such strong tickling sensation is attenuated when they do the same stimulation by themselves. In general, the sense of agency, which is the sense that we are generating or managing actions of our body, is considered to be a key factor of prod...
Article
A magnetic suspension system with three flux-path control mechanisms are developed to achieve three-dimensional positioning of the suspended object (floator). In the flux-control mechanism, a ferromagnetic control plate is located in the lateral direction of the magnetic source (permanent magnet). It was shown that the attractive force acting on th...
Article
Full-text available
This paper focuses on compatibility of zero-compliance and zero-power characteristics in a single system. To realize such compatibility, a horizontal zero-compliance system is developed, in which a zero-power controlled voice coil motor is connected with a normal spring (positive stiffness) in series. Since the zero-power control results zero-curre...
Article
Via holes are drilled for interlayer connection in printed circuit boards (PCBs). PCB needs washing process to remove impurities after being drilled. Water remains in via holes in PCB after the process. For removing water, application of focused ultrasonic waves has been proposed. Previously, it has been pointed out that dewatering success rate dep...
Article
This paper exhibits the development of a vibration isolation system using an active dynamic vibration absorber (ADVA) as an accelerometer in a low-frequency range; whereas, it operates as a vibration control device in a high-frequency range. The control signal of the ADVA gives an information of the low-frequency acceleration. At the same time, in...
Article
Full-text available
Measuring microforce is inevitable in the current technical world of micro-assembly and micromanipulation. Zero-compliance principle is implemented in measuring microforce. There are two floators suspended in series to achieve zero-compliance in force measurement. The first floator is denoted as detection point and the second floator is denoted as...
Article
Force measurement using zero-compliance mechanism is proposed and studied experimentally. A zero-compliance mechanism is composed of two suspensions connected in series; one of them is operated to cancel the deflection of the other so that the total length of the suspension is maintained even if force acts between the ends. In the proposed measurem...
Article
A compact active three-degree-of-freedom magnetic suspension system is fabricated which has a new configuration of magnetic poles. The fabricated magnetic suspension system has a differential structure consisting of an upper and a lower electromagnets. The electromagnet consists of four poles with coils and a single common pole whose opposite plane...
Article
A three-dimensional force measurement instrument is designed and developed by considering the basic principle of zero compliance mechanism. In the proposed system, the point of force and the detection point are connected in series and suspended with leaf springs. One of the suspensions operates to cancel the displacement of the other. If any force...
Article
A basic single-degree-of-freedom magnetic suspension system consists of one floator, one electromagnet and one amplifier. For multi-degrees-of-freedom control, multiple electromagnets and multiple amplifiers are necessary, which increases the cost of total system. As a means of overcoming this problem, parallel magnetic suspension has been proposed...
Article
Full-text available
Reduction of vibration in passively supported lateral directions by varying stiffness control is discussed in a vertically active magnetic suspension system. In the target system, one pair of electromagnets is arranged in differential driving mode to actively control the vertical motion of the floator. Usually the floator is prone to vibrate in the...
Article
A novel force measurement instrument is designed and fabricated to validate multi-dimensional force measurement using zero compliance mechanism. In each axis, there is a point of force and a detection point for zero-compliance force measurement. Both the detection point and the point of force are suspended in series and attached with the base frame...
Article
Cryopump is a vacuum apparatus used in various high-accuracy measurement systems such as those for detecting gravity wave and observing micro motion of molecules. However, the pump induces vibrations with multiple frequencies, which may deteriorate measurement accuracy. To overcome this problem, a vibration isolation apparatus with an active dynami...
Article
Our previous studies discovered that small particles scattered at the bottom of a water-filled rectangular container align at specific positions when the container is laterally oscillated at specific frequencies. Also, a batch manipulation method of submillimeter-scale small particles was proposed by using this unique phenomenon. In the present stu...
Article
Previously, a tactile display using surface acoustic wave which is a kind of ultrasonic vibration has been developed and can render tactile sensation like roughness. Basic principle is friction reduction induced by the wave and its control. Switching the wave at certain intervals results in vibrations on user's finger surface. To consider realistic...
Article
Our previous studies have proposed active self-touch in which experimental participants can voluntarily touch a fake/virtual body as well as their own body by using a robotic master-salve system when experimentally manipulating sense of body ownership. This paper introduces a novel experimental platform that can control temperature displayed to the...
Article
In this paper, we explained a pneumatic film actuator fabricated by molding process. In our previous research, a bending type actuator have been developed. The bending motion is occurred by pleated structure. The structure is formed by folding process of films. The folding process is performed manually and is complicated. Additionally, the pleated...
Article
Full-text available
A switching stiffness control and a modified variable stiffness control were applied to reduce vibration in the lateral directions in active magnetic suspension system with electromagnets operated in the differential mode. The magnetic suspension system using the attractive force between magnetized bodies is inherently unstable in the normal direct...
Article
A zero-compliance mechanism is fabricated which uses a one-piece parallel spring movement and a voice coil motor to achieve force measurement. The conceptual zero-compliance mechanism is a series connection of a spring with positive stiffness and a spring with negative stiffness whose amplitude is equal to the positive one. When force acting on the...
Article
Full-text available
A compact axial active magnetic bearing with a function of two-tilt-motion control is fabricated which has a new configuration of magnetic poles. They consist of four cylindrical poles with coils and a single common pole whose opposite plane of the rotor has a permanent magnet to achieve multi-degree-of-freedom zero power control. Modal control is...
Article
Full-text available
A new over-flow prevention valve with a trigger mechanism is designed, fabricated and studied experimentally to evaluate its performances. Loading arms are used to transfer combustible fluid such as oil between tankers and tanks. A loading arm is equipped with an over-flow prevention valve for safety. This valve stops the fluid flow when the fluid...
Article
Full-text available
A wind-tunnel system for spinning body has been proposed to measure hydrodynamic forces acting on the body. In the proposed system, the body is suspended and rotated by electromagnets. The forces are measured from the control signal for suspension. In the previously fabricated apparatus, eight electromagnets were placed around a wind-tunnel. An opt...
Article
Full-text available
This paper treats a relay-feedback mass measurement system that uses a relay with hysteresis and feeds back the velocity of the object. The measurement system has an on-off relay with hysteresis and switches force acting on the object in relation to its velocity. Such nonlinear control induces a limit cycle. The mass of the object is determined fro...
Article
Full-text available
Parallel magnetic suspension has been proposed which levitates multiple floators with a single power amplifier. This study applies this concept to a multi-degree-of-freedom system. In such systems, multiple electromagnets are used to stabilize multi-degree-of-freedom motions of the floator. In conventional system, each electromagnet is driven by th...
Article
Full-text available
A novel flux control magnetic suspension system that places control plates beside the magnetic source (permanent magnet) is proposed. In a conventional flux-path control magnetic suspension system, the control plates were inserted between the magnetic source and the suspended object (floator). In contrast, the control plates were placed beside the...
Article
Parallel magnetic suspension that controls multiple floators or multi-degree-of-freedom motions with a single power amplifier has already been realized. This study focuses on zero-power control in a two-degree-of-freedom parallel magnetic suspension system. The zero-power control is achieved by feeding back the integral of the control current. The...
Article
Accelerometer using zero-compliance mechanism is purposed in this paper. This accelerometer is invented to measure long-period and small oscillations such as ground motions and building vibrations with a high resolution. The zero-compliance mechanism is composed of two suspensions with positive stiffness and negative stiffness. Force acting on the...
Article
Many kinds of viscous liquid are used in industrial processes. Viscosity causes resistance to fluid flow. The higher the viscosity of a liquid is, the higher will viscous resistance is. Highly viscous liquid is hard to flow. Several methods are available to control the viscosity of a liquid which has many industrial applications. This study focuses...
Article
Parallel magnetic suspension that controls multiple floators or multi-degree-of-freedom motions with a single power amplifier has already been realized. In this system, all of the suspended points move simultaneously even when a disturbance acts on one of the suspended points solely because all electromagnet’s coils are connected. This paper studie...
Article
It has been reported that an object can be suspended below a vibrating surface in air. We call this phenomenon ultrasonic suspension. When an object is suspended, a restoring force attracts the object horizontally to the center of the vibrating surface. Previously, characteristics of the forces acting vertically and horizontally were experimentally...
Article
Double series magnetic suspension is applied to force measurement. In a double series magnetic suspension system, two floators are suspended with a single electromagnet. When the position of the second floator is regulated, for example by PID control, the second floator is maintained at the original position against an external force acting on it w...
Article
Full-text available
A wind tunnel system for a spinning body was developed for the measurement of the hydrodynamic forces acting on the body. In that system a ferromagnetic sphere (body) was suspended and rotated by electromagnets. The forces acting on the body were measured from the control signal for suspension. However this existing arrangement is not still appropr...
Article
Full-text available
Currently, pumps are used in various fields to supply air and liquid. These pumps include sliding parts and there is a limit of life time due to friction and wear. To solve this problem, a number of pumps using ultrasonic vibration have been proposed. A common feature of ultrasonic pumps is having no sliding parts. Therefore, the life time seems lo...