Steer-by-wire systems have the range of the front steer angle about ±30 deg. It is not easy to find a technique theoretically for controlling the control variable region in such a large steering angle independently from the steer of the driver. A certain kind of steer pattern emerged in our control method has better performance than that of state feedback. Authors have already developed the energy optimal control theory. This method was applied to steer-by-wire and the effect on the crosswind stability was evaluated. In this paper, it is clarified that an emergence pattern was generated in the wave form of control signal, and the performance was increased in the high-speed rapid lane change situation.

抄録全体を表示

In this paper, authors refined Hybrid-type active suspension system. By remodeling hybrid-type active suspension, equivalent inertia was cut down. Authors verified effect of the inertia reduction by simulation. From result of the simulation, it is revealed that even if the suspension's control input stop, the system keep moving as passive clamper. Moreover, authors proved that the effects of hybrid-type suspension system is affected by resistance of circuit of motor driver. And selecting optimal resistance value, hybrid system grows in performance by a large margin.

抄録全体を表示

In a coupled structural-acoustic system the input load to a structural system is tried to be identified by using sound data in an acoustic system. In order to carry out the identification a wavelet packet analysis and a neural network are used. The feature of the sound data is derived by calculating an energy value from a wavelet packet analysis. The obtained energy value and the time history of an input load are learned by a holographic neural network and the time history of an unknown load is identified from a sound data by testing the neural network. The obtained result shows that the identification accuracy is very good.

抄録全体を表示

Satellites are launched to space with locked up inside fairing which is top of rocket. When rockets are launched, mounted satellites are under inclement mechanical environment and various mixed mechanical environment act satellites. Satellites should be designed to withstand such mixed environment and are tested and estimated as each environment. In this thesis, we focus on environment of acoustic load of satellites and consider response of acoustic vibration of satellites.

抄録全体を表示

Pitching machine with three rollers for baseball can pitch balls at various speeds and pitch types that are developed by the authors. In this study, the influence that a hard-baseball with a seam has on the throw accuracy of the pitching machine with rollers is examined. Finite element models of a ball with seam and the pitching machine with three rollers and spring are made, and throw simulations are proceeded with consideration of the seam using dynamic finite element analysis. These analytical results are inspected by the throw experiments using the pitching machine.

抄録全体を表示

In design of tracked vehicles that run on non-pavement road or soft ground, it is important to analyze the interaction between a machine and soil. In this research, attention is focused on the interaction under front-idler, that is, traction soil by a grouser in driving system. To validate the interaction simulation between a grouser and soil by using DEM soil model, 3-dimensional traction simulations and experiments were carried out. Comparing the results of the simulations and experiments, soil behavior and qualitative tendency of traction resistance conformed well. Therefore, it could be found that the soil model is validated.

抄録全体を表示

It is thought that it can take the car more comfortably and safely by understanding car occupant's somatic condition beforehand. In the present study, Doppler module was equipped in the seat of the car, and the heart beat was measured from dorsal of the subject. The measurement of the heart beat is possible when the seat surface cloth is separated. However, accuracy has decreased. Moreover, a clear influence was not seen though it measured with the engine operated.

抄録全体を表示

In this study, the effect of head posture on neck injury during rear-end impact was studied. First, a head-neck FE model was developed. Second, the behavior of the model during low-speed rear-impact, lateral bending and axial rotation was validated against experimental results. Third, rear impact simulations with 3 types of initial head postures including head-forward, lateral bending and axial rotation were conducted. Finally, the difference of the model behavior among 2 simulations was clarified, and that facet ligament strain during lateral bending and axial rotation simulation might exceed the strain during head-forward simulation was also clarified.

抄録全体を表示

In development of automobile, improving ride quality has been strongly demanded. It is necessary to analysis and to evaluate the method of ride quality. The driver damaged a multi-dimensional vibration. The driver is judging riding comfort because of it. This study aimed at the grasp of the vibration feeling receiving characteristic in the low frequency band. We investigate human to the coupled vibration of the sinusoidal wave. As a result, it was clarified that human had the discomfort for a specific vibration.

抄録全体を表示

The standard vibration characteristics and the standard model of the seated human body under whole-body vibration are specified by IS05982 in terms of the driving point apparent mass and the acceleration transmissibility of the head. These are based on various past studies that Westerners are subject. So there is a possibility that these standards don't apply to Japanese (Asian). Therefore, the purpose of this paper is to compare these characteristics acquired by Asian with those of ISO5982. Some experiments with Japanese subject mainly are performed in experiment conditions complying with ISO. Results show that there is a possibility that ISO standards don't apply to Asian.

抄録全体を表示

The purpose of this study is to clarify the effects of the type of adhesive on the performance of Kyoto bow (Nibe bow and Synthetic bow). Motion analysis of the archer during the drawing motion of the Kyoto bows was performed by attaches markers and load cell onto the bows. Additionally, the velocity of the arrow was calculated by image processing, and correlated to the motion of archers during the drawing of two types the bow.

抄録全体を表示

This study aims at achieving drastic computation time reduction of the brain shift simulation for future clinical applications by developing a new finite element brain model. The new hemispherical brain model without right cerebral hemisphere which makes little impact on brain shift is proposed. The equivalent force boundary conditions are derived and then applied to the cross section of the proposed model. The brain shift analysis using the proposed model successfully achieved up to 63% reduction of computation time comparing with that using the whole model. The results obtained by the both models were good agreement with each other.

抄録全体を表示

To develop a high usable keyboard, a strokeless keyboard which has under a 0.2mm stroke was manufactured in the previous study. From the experiments done for this keyboard, the strokeless keyboard was found, by electromyogram, to heighten the stress of the body when the keyboard was typed. In the present study, electromyograms of the finger pushing downward and pulling upward movement during keyboard operation are measured. The testees are classified into 2 groups, each of which has 10 people. These members of the groups are adapted, respectively to each type of keyboard, standard keyboard which is usually found in the store and strokeless keyboard manufactured in this study, for two weeks. After two weeks' adaptation, the electromyograms are measured for these testees of the two groups during the keyboard operation. For the testees whose finger is pulled upward strongly, the strokeless keyboard is unfavorable due to high stress for the bodies. From this result, we need further study to develop a high usable keyboard.

抄録全体を表示

This study considers the one-degrees-of-freedom platform on which a human stands. The human body and the platform are modeled as a linear two- degrees-of-freedom vibration system. The mass, the viscosity, and the stiffness parameters of human body are identified by the least squares method of the experimental frequency response. Furthermore, the influences of loads on the human's consciousness are investigated experimentally, and the relationships between the loads and the changes of the identified parameters are discussed.

抄録全体を表示

Even in aircraft with different flight characteristics, a human pilot tries to obtain the desired flight response by changing his own control characteristics. This study takes up a subject concerning the limit of this pilot's adaptation capability. It experimented to examine the adaptation capability in roll control using a fixed-based flight simulator. THE controlled aircraft model adopted in these experiments is a pure first-order lag system and a pure second-order lag system. The crossover model is used for the adaptability judgment. As a result, the later case had the relation to flying quality level of MIL-F-8785C.

抄録全体を表示

Prolonged exposure to hand-arm vibration (HAV) due to use of hand-held power tools leads to an increased occurrence of symptoms of disorders in the vascular, neurological, and osteo-articular systems of the upper limbs called hand-arm vibration syndrome (HAVS). Biodynamic responses (BR) of the hand-arm system to vibration can be suggestive parameters that give us better assessment of exposure to HAV and fundamental data for design of low-vibration-exposure power tools. Previous studies on BR measurements have been performed under one-axis vibration mainly because of technical problems. In this study measurements of BR parameters of the hand-arm system were performed using a state-of- the-art tri-axes vibration system to examine effects of arm postures on vibration transmission/absorption behavior of the hand-arm system under multi-axes vibration. Our measurements resulted in an increase in vibration power absorption (VPA) especially at the palm side when the elbow was straightened with the forearm rotated internally, showing inverse effects of elbow extension on VPA and hence the health risk of exposure to vibration at the hand.

抄録全体を表示

Coupled human balancing tasks are investigated based on both pseudo-neural controllers of time-delayed feedback controllers with random gain and natural human balancing tasks. It is shown numerically that being compared with single balancing tasks, the balancing tasks coupled by mechanical structures increase stability of balancing errors both in amplitudes and velocities and also improves tracking ability of the controllers. We then perform an experiment in which the numerical pseudo-neural controllers are replaced with natural human balancing tasks through the use of computer mouse devices. The result shows that the coupling structure yields asymmetric tracking abilities between the subjects whose tracking abilities are nearly symmetric in their single balancing tasks.

抄録全体を表示

The purpose of this study was to quantify the contribution of the kinetics variables, such as the upper limb joint torques, shoulder joint inter-segmental forces, and motion dependent term, to the bat head speed during baseball batting motion. The upper limb segments and bat were modeled as a seven-rigid-segment system, and each elbow joint was modeled as a one-axis revolute joint to consider the degree of freedom (DOF) of the joint The equation of motion associated with the upper limbs and bat was obtained from the equation of motion for each segment and from equations for constraint condition in which adjacent segments are connected by joint The relative dynamic contributions of the joint moments, shoulder joint force, motion dependent term and gravity term to the bat head speed were derived from the dynamic equation of the system. From the results obtained in this study, the motion dependent term make significant role for generation of the bat head speed during forward swing motion in baseball batting, and the shoulder joint torque of the knob-side upper limb showed a large contribution to the head speed.

抄録全体を表示

We have already formulated an optimal control model of human three-joint arms characterized by its hand-joint's freezing mechanism and its optimized evaluation function composed of three kinds of energy costs. This report applies this model to reaching movements through various kinds of via-points and clarifies the effectiveness of the model in reproducing experimentally measured via-point movement characteristics. Consequently, it was clarified that the model reproduces not only the hand-joint's freezing phenomenon but also hand-joint's non-freezing characteristics caused in the vicinity of the via-point and that it reproduces hand trajectories measured for various kinds of via-point reaching movements. These results suggest that the model is more effective as a model of the human three-joint arm control system.

抄録全体を表示

We have formulated a three-link (one upper body, two thighs, and two lower legs) and three-joint optimal control model that reproduces rising movements from a chair and considered optimization factors indispensable for realizing the same rising movements as humans. This model changes two kinds of dynamics at time tl (switching time): one dynamics operates while we are sitting on a chair, and another operates while we are rising from the chair. Consequently, it was clarified that the proposed model can reproduce characteristics for experimentally measured human rising movements by adjusting the model is switching time tl from one dynamics to another, the input weight (torque change), and the dynamics switching parameter in the evaluation function. This result suggests that the three kinds of optimization factors can be strongly involved in realizing rising movements.

抄録全体を表示

We developed a device that calculates and displays the center of gravity point and joint moments at the same time with motion. This device can also analyze the motion when people are affected reaction force by the combined use of force sensor. In the application of this Real-Time Analyzer to analyze the Activities of Daily Living as push and pull motion, we examined the most suitable method of motion with a few physical burdens.

抄録全体を表示

A typical method for measuring the load added to the intervertebral disk that causes lumbago is an invasive method to inserting the electrode into there directly. In this study, the intervertebral disk load is estimated by noninvasive method of measuring the shape of spine with three dimensional motion analysis system and signal processing. Under assumption that spine is a beam, spine is approximated in the curve with theory of beam, and the load is evaluated by using the amount of derived curvature change. Therefore, proposal method is safe. Moreover, intervertebral disk load can be estimated while moving.

抄録全体を表示

Human voices are originated by vibration of vocal folds in larynx. This vibration is induced by the airflow that is expelled through glottis, and causes a series of the pulses of the airflow. These pulses excite vocal tract and bring about the passive resonance of the vocal tract in all voiced sounds. Therefore, detailed study of vocal fold vibration is believed to be important to elucidate mechanism of human phonation. Thus, in the present study, experimental analysis of vocal folds vibration during phonation was made to clarify phonation mechanism and seek better modeling of vocal folds, focusing on simultaneous measurement of glottal velocity. The vocal folds vibration was also recorded by means of a high-speed digital camera synchronized with the measurement of the glottal velocity. The distribution of the glottal velocity during phonation can be explained well by the experimental results.

抄録全体を表示

This paper describes a magnetic suspension system using a rotary motor and a disk magnet. In this suspension system, the suspension force to the suspended object is provided by a disk-type permanent magnet and controlled by a magnetic resistance control device, which controls the angle of disk magnet to change the flux flowing through the suspended object. This suspension system can generate a zero attractive force, change the polarity of the stator poles, and realize zero power control for any suspension poison. In this paper, the suspension principle of this suspension system is introduced, the IBM (Integral Element Method) analysis for magnetic flux path is performed, the model and simulation are carried out, and some suspension experiments are executed. Finally, some results are shown.

抄録全体を表示

The variable flux path suspension system is a magnetic suspension system using the force of attraction between a permanent magnet and a ferromagnetic suspension object. Stable suspension and three-dimensional positioning was realized when a single magnetic source was used. However, the horizontal control force was much less than the vertical control force. This paper proposes a variable flux-path suspension system with multiple magnetic sources to make the horizontal force in the same range of the vertical force. A variable flux path module applicable to such multiple magnetic source system is developed. Stable suspension is achieved with this module. In addition, zero-power control is achieved by the feeding back the integral of current of the actuator.

抄録全体を表示

We miniaturized magnetic bearing and levitated a rotor experimentally. Designed Magnetic bearing supports a rotor with two active radial bearings and a passive thrust bearing. First, we miniaturized a height of stator by applying a permanent magnet to thrust bearing and levitated a rotor successfully. Second, we compared measured stiffness value with calculated it. The result shows that designed magnetic bearing has 73 % of calculated stiffness value. And then, displacement sensor is integrated radial bearing for miniaturizing radial diameter. Lastly, we simulated and experimented levitating a rotor.

抄録全体を表示

A novel 5-DOF actively controlled self-bearing motor that combines the functions of a motor, two radial AMBs, and an axial AMB has been developed to achieve smaller size and higher performance simultaneously. In this paper, prototype 5-DOF self-bearing motor is evaluated by static and dynamic experiments. First, the fundamental performance of the 5-DOF self-bearing motor such as the motor torques, the radial and axial control forces and the tilt control torques are measured. Second, the dynamic performance was tested by measuring the step responses and the frequency responses. Finally, the maximum oscillation amplitude and power consumption are measured during rotation without any contact. The results showed high feasibility of the proposed 5-DOF self-bearing motor.

抄録全体を表示

Self-bearing motor has combined function of rotating motor and magnetic bearing. Usually levitation force is produced by Maxwell force while the motor torque is produced by the Lorentz force. The authors have propsed Lorentz type self-bearing motor where strong magnetic flux is the key technology. In this paper three types of rotor are designed and compared: a flux concentrated PM rotor, Halbach PM rotor with iron backyoke and Halbach PM rotor with aluminum backyoke.

抄録全体を表示

In this research, it proposes the drive method of magnetic material disc by rotation magnetic field. When the rotating magnetic field is given to the magnetic material disc, the magnetic material disc is magnetized by a different phase. Therefore, magnetic attractive force between the magnetic material disc and the rotation magnetic field acts on the vertical direction, the radial direction and the circumferential direction. At this time, only force in the circumferential direction comes to act, because force in the vertical direction and radial direction are composed to be negative each other. The rotating torque is generated by force in the circumferential direction. Therefore, the magnetic material disc rotates. In this research, it aims to clarify the driving principle of this proposed rotor by doing the magnetic flux density measurement, torque measurement and the torque analysis.

抄録全体を表示

Tandem-type multiple magnetic suspension system is studied in this paper. In this system, several floators are suspended in series by an electromagnet. The controllability and observability of the system that has arbitrary number of floators are proved. A tandem-type multiple magnetic suspension system was fabricated in order to exam the controllability and observability experimentally. In the fabricated system, magnetic suspension units that include a sensor and an electromagnet are used instead of floators. To realize the complete tandem-type multiple magnetic suspension, basic trial is carried out using the fabricated system.

抄録全体を表示

In the recent five years, we produced some contact-free actuation model without electrical power supply by using diamagnetic graphite (PG) plate. In this phenomenon, it seems that the extremely energy saving contact-free actuation of PG plate is caused by diamagnetic force acting on PG plate sample in the magnetic gradient formed by Halbach PM array and PM pieces. In this paper, we would like to show a static measurement method for the detection of diamagnetic force acting on an asymmetrical PG plate, and we considered preliminary observational results of diamagnetic force for contact-free motion of an asymmetrical PG plate.

抄録全体を表示

Magnetic bearings have advantages such as no friction loss, no abrasion, lubrication free operation and so on. However it is not used widely due to its high cost and big size. In order to solve these problems, active magnetic bearing with a distributed winding was proposed. But sinusoidal variation of bearing force in angle variation of rotor is confirmed and its impacts on bearing loss. In this paper, causality of the bearing force characteristic variation is analyzed from two viewpoints of magnetic flux density and winding-accuracy changes. And aim at decreasing the sinusoidally-bearing force characteristic variation.

抄録全体を表示

The magnetic levitation system has not only the strong nonlinearity in the magnetic force but also the delays in electric circuit and magnetic circuit. This paper investigates the modeling of the magnetically levitated body considering both of them. The dynamic coefficients of the electric circuit and magnetic circuit of control system are estimated experimentally, and they are expressed in terms of the gap and electric current. The numerical simulation of the developed model is validated experimentally by comparing the resonance curves.

抄録全体を表示

This paper deals with a magnetic levitated rotor utilizing repulsive force of permanent magnets and gyroscopic effect of a rotor. The effect of distance of center of gravity of rotor and center of magnetic force, which is caused by the position of additional mass for balancing of gravitational force and magnetic force, on stable rotational speed is investigated. The result is confirmed by experiments. Based on this result, a new shaped rotor, which has a disk-like additional mass above a magnet apart, is proposed. A large mass that could not be levitated before can be levitated by using this model.

抄録全体を表示

This paper suggests a method to control an unbalance vibration of the magnetic bearing by model bridge control. Model bridge control is the Multi-Freedom control theory that we propose and can compensate for each control problem, e.g. disturbance response. In this paper, a controller design method using a disturbance compensation characteristic of model bridge control is shown. The controller gets possible to control a disturbance with the specific frequency by using a disturbance model. The effectiveness of the proposed method is clarified by simulation.

抄録全体を表示

When precision industrial products such as electronic component are transported in a vehicle, damage may be caused with disturbance. Disturbance is impact/vibration inertia force or forced displacement Under the present conditions, damage is being reduced using cushioning material, but anti-shock/vibration device is necessary according to the increasing demand of precision product performance. In this paper, we propose the disturbance isolation control of a transportation platform using a moving-magnet-type linear motor. Experiments are performed for constant forced displacement as disturbance and show that the platform is maintained at the desired position using the current control or voltage control.

抄録全体を表示

In order to apply active magnetic bearings to new industrial application such as heating roller, we propose a novel active magnetic bearing which can support a heavy load with a compact body. In the previous paper, we reported structure of the new magnetic bearing and availability of it showing results of experiments using a small testing machine. By the experiments, some new problems were found; adjusting right levitating points, reducing power consumption, improving robustness. In this paper, we adapt zero power control and sliding mode control to the position control system to solve these problems and realize availability of them by experiments.

抄録全体を表示

For the spread of small fuel cells, it is important to improve the performance of peripheral devices including fuel supply pumps, and to lower a price of them. A miniature diaphragm pump can utilize as a fuel supply pump, however it has many problems. Therefore, we propose small regenerative pump using axial self-bearing motor. The unidirectional type Axial Self-Bearing Motor that has a function of producing motor torque and controlling axial position of the rotor enables miniaturization and reducing cost. In this paper, a structure of the pump and control system are introduced, and results of pump efficiency are shown.

抄録全体を表示

This paper describes a novel concept and configuration of Electric Vehicle powered by flywheel with Active Magnetic Bearing suspended by gimbal mechanism to the vehicle body. The entire system consists of AMB Flywheel Energy Storage including energy charger/discharger module, mechanical 2-DOF gimbal, steer-by-wire module, and autonomous driving module as the supervising controller. This paper shows the results of outdoor field experiments including the efficiency measurement of the energy conversion system.

抄録全体を表示

Macroscopic loss factors are derived for a composite material containing many ellipsoidal reinforcements whose semi-axes are different from each other by using the equivalent inclusion method combined with the Mori-Tanaka theorem. Eshelby tensor rearranged as a function of Poisson's ratio of the matrix multiplied by the geometrical factor is used for the reinforcement in the analysis. Since all reinforcements are assumed to align along the same direction in the modeling, the composite material has three perpendicular two-fold rotational symmetries and hence nine components of the macroscopic loss factor of the composite can be expressed in terms of the geometrical factors. Moreover, it can be seen that the imaginally part of the complex Poisson's ratio of the constituent must be equal to zero from the condision that the magnitude of the macroscopic loss factor of a porous material must be equal to that of the matrix.

抄録全体を表示

An effect of architecture of fiber reinforcement on the material damping of fiber reinforced plastics has been investigated. The vibration tests of CFRP beam specimen with various architecture of fiber reinforcement have been carried out in low-pressure condition in order to get rid of the effect of atmosphere. From these results, it is recognized that damping ratio depends on fiber volume fraction and architecture of fiber reinforcement.

抄録全体を表示

This paper describes the dynamic characteristics based on microtremor measurement data concerning a high-rise steel building. The object building which was completed in October 1998 is 120m height and rectangular plan. Microtremor measurement is continued periodically in the building. The acceleration and velocity of measurement data in two horizontal directions and torsional direction are analyzed for natural frequencies and damping ratios on 1st mode to 4th mode. The changes along passages and the dispersions of those dynamic characteristics in microtremor are studied. And the relations between amplitude and damping ratios in free vibration waves by manpower excitation are discussed.

抄録全体を表示

The purpose of this study is to investigate the damping property of wooden frames with and without viscous damping devices by full scale shaking table test. We compared the damping factors of wooden frames with and without oil dampers before and after the action of the 1995 Kobe earthquake. Making use of the acceleration record, damping factors and natural frequencies of the frames are identified by the frequency domain decomposition technique, the random decrement technique and acceleration-displacement spectrum method. It is verified that damping factors are strongly amplitude-dependent.

抄録全体を表示

Recently, damping materials are used in many applications. One of the applications is a carriage arm which is used in a hard disk drive to position a read-write head on a track precisely. When we try to improve a damping performance of a constrained-type damping material for the carriage arm, it's difficult to simply enlarge the material due to geometric and cost limitations. Therefore, other techniques are needed. In this paper, a splitting technique is proposed to improve the damping performance. At first, deformation of a visco-elastic material are categorized to three kinds. In the deformations, bending and shearing are showed that a strain energy doesn't increase by splitting. Therefor, focusing on deformation of stretch in thickness, the deformation shape and a strain energy are derived. The result shows that the energy increases by splitting if the parameter φ is more than 8, which is defined as ratios of length to thickness and stiffness of the visco-elastic material to one of the constrainer. Finally, numerical simulations are conducted to show the improvement.

抄録全体を表示

Filled rubbers are often used for control of a vibration and noise. The dynamic property of a filled rubber depends on frequency, temperature, and amplitude strain. It is very important to understand a behavior of the rubber for a small oscillation, and it is very useful for control of small oscillation occurred on a steel etc to construct dynamic models. In this paper, the dynamic properties of the rubber for small oscillation are expressed by using the fractional dynamic model. And the relationships between the parameters and weight of carbon are investigated.

抄録全体を表示

It is important to formulate the dynamic property of tire tread-rubber for analyzing the vibration which occurs on the tire when the tire collides with a small unevenness. Though nonlinear dynamic behavior in tire tread-rubber, called Payne effect, has been known, but the satisfied model is not yet constructed. Constructing the model leads to dynamic analysis of systems including various rubber part, products, and them. In this paper, a mechanical model which can express the dynamic behavior of the tire tread-rubber is proposed. To determine many parameters of the model, optimized program is developed referring to genetic algorithm.

抄録全体を表示

Carbon black filled SBR (styrene-butadiene rubber) is used for tire tread rubber. The filled SBR undergoes dynamic large deformation at abrupt steering. It is important for mechanical analysis of tire to study on the behavior for dynamic large deformation. The aim of this paper is to propose the mechanical model for dynamic large deformation, taking into consideration the results of uniaxial stretch tests at several rates for filled rubber and higher-order structure of rubber, which is chiefly consist of molecular network, entanglement, filler and its bound rubber.

抄録全体を表示

In order to protect precise machinery from external vibration, various types of vibration isolation system have been proposed by many researchers. For the passive isolation system, a friction damper is often used because it is simple, inexpensive and reliable. However, the ordinary friction damper of constant friction force has performance limitation, because the isolation characteristic declines when the friction force is large, while resonant peak becomes large when the friction force is small. Furthermore, the displacement remains apart from the equilibrium position after the disturbance disappeared. These characteristics are disadvantageous when position recovery is required. In order to overcome above drawbacks of the ordinary friction damper, the new type of friction damper is proposed in this paper. In the new friction damper, the friction lever mechanism is devised to make the magnitude of the friction force proportional to the relative displacement. This is achieved by contacting the inclined lever with rotational spring to the cylindrical block. When the cylindrical block moves and the angle of inclination of the lever varies, the normal and frictional forces at the contact surface vary according to the displacement of the cylindrical block.

抄録全体を表示

In this paper, the vibration suppression performance of two types of hardening type friction dampers for a seismic isolation table is discussed. One is a friction damper whose friction force increases lineally with displacement and another is a friction damper whose resisting force characteristic is composed of a constant force part and a hardening force part. The calculated and experimental results showed that the hardening type friction damper with a constant force part is most effective for suppressing the vibration of an isolation table caused both by common and long-period seismic ground motions.

抄録全体を表示

A damping device for electric-railway pole has been invented in order to reduce the vibration caused by an earthquake or passing train. The authors conducted theoretical analyses of pole response equipped with the damping device and vibration test of real scale pole. The result of theoretical analyses has been found to be almost identical to the result of vibration test. Moreover, as the result of vibration test, damping effect of the device has been verified.

抄録全体を表示