Nec Corporation

Nec Tokin Corporation

Nec Tokin Iwate, Ltd.

Kabushiki Kaisha Toshiba

Shigeru Kasai

Shohei Kinoshita

Yasuhiro Sasaki

Hiroshi Sakai

Eisuke Saneyoshi

Masatake Takahashi

Shigeki Shinoda

Hajime Mori

Noboru Saito

Yu Kiyokawa

Tatsumi Ide

Kunihiko Kinugasa

Murtuza Petladwala

Nobuhiro Mikami

Tsuyoshi Hagiwara

Takeshi Maehara

Masanobu Watanabe

Soichiro Takata

Kei Chiba

Yoshinori Ota

Yoshifumi Chida

Yuusuke Watanabe

Kenichirou Suzuki

Kiyofumi Saiki

Ken Okuda

Michikazu Kondo

Hideshi Iwasa

Akira Yahagi

A bearing diagnosis apparatusthat accurately diagnoses the state of a bearing includes: an extraction unitconfigured to extract a feature amount using first index information indicating a response of a structureto an external force and second index information indicating a response, to the external force, of a bearingprovided to the structure; and an assessment unitconfigured to assess the state of the bearingbased on the extracted feature amount.

Bearing diagnosis apparatus, bearing diagnosis method, and computer readable recording medium

A vehicle weight estimation apparatusincludes: a collecting unitthat collects vibration information indicating vibration output from a sensorinstalled to a structure having a vibration-generating structure that generates vibration upon passage of a vehicle; an axle response extracting unitthat detects, by using the vibration information, axle responses indicating the passage of one or more axles of the vehicleover the vibration-generating structure; an axle index calculating unitthat calculates axle indices corresponding to the individual axles based on the axle responses; a converting unitthat converts the axle indices into axle weights by referring to conversion information that is stored in advance and that indicates a relationship between axle indices and axle weights; and a vehicle weight calculating unitthat calculates the weight of the vehicle by totaling the axle weights of the individual axles.

Vehicle weight estimation apparatus, vehicle weight estimation method, and computer readable recording medium

An apparatus includes a signal acquisition part acquires oscillation signals from sensors provided under lanes of a bridge and close to an expansion joint, a signal separation part applies BSS to the oscillation signals to estimate source oscillation signals respectively separated in the plurality of lanes, and adjusts amplitude of the source oscillation signals to output amplitude adjusted oscillation signals, and a vehicle estimation part estimates, from the amplitude adjusted oscillation signal, a response oscillation due to a vehicle passing on the lane of interest to detect and count vehicles passing on the lane.

Vehicle detection apparatus, method and program

A weight estimation apparatusincludes: an impulsive force calculation unitcalculating an impulsive force using an acceleration response indicating vibration generated in a structure by the moving object (vehicle) moving through the structure, and a weight estimation unitestimating a weight of the moving object using the impulsive force.

Weight estimation apparatus, weight estimation method, and computer-readable recording medium

A structure diagnosis apparatusfor diagnosing a state of a structure in which there is a small change in the natural frequency includes: a natural vibration extraction unitconfigured to acquire, from a plurality of sensorsthat a structure is provided with, vibration information indicating vibration generated in the structure, and extracting natural vibration using the vibration information; a spectral shape extraction unitconfigured to extract spectral shape information indicating a shape of a spectrum using the natural vibration; an index calculation unitfor calculating an index indicating a relationship between the spectral shape information and reference spectral shape information that is a preset reference; and a state estimation unitfor estimating the state of the structure based on the index.

Structure diagnosis apparatus, structure diagnosis method, and computer-readable recording medium

A state estimation apparatusincludes an acquisition unitthat acquires deterioration information indicating a deterioration state of each structural object and a learning unitthat learns common information that is common between pieces of the deterioration information and estimation index information that is used for estimating a deterioration state of a target structural object, using the deterioration information as input.

State estimation apparatus, state estimation method, and computer-readable recording medium

A damage diagnosis device is provided with: a detection unit for detecting that, immediately after a vehicle crossing a bridge has exited from the bridge, another vehicle is not crossing the bridge; a determination unit for determining whether the weight of the vehicle satisfies a criterion; and a diagnosis unit that, when the detection unit has detected that no other vehicle is crossing the bridge and the determination unit has determined that the weight of the vehicle satisfies the criterion, diagnoses damage to the bridge on the basis of information representing free vibration generated in the bridge due to the crossing of the vehicle, thereby improving the precision of diagnosis when damage to a bridge is diagnosed on the basis of information representing free vibration generated in the bridge due to the crossing of a vehicle.

Damage diagnosis device, damage diagnosis method, and recording medium in which damage diagnosis program is stored

A diagnosis apparatusincluding: a target vibration information generation unitthat generates pieces of target vibration information; a comparative relationship information generation unitthat generates pieces of comparative relationship information indicating relationships among the pieces of target vibration information, or the pieces of comparative relationship information indicating relationships among pieces of reference vibration information and the pieces of target vibration information, the pieces of reference vibration information indicating vibrations in the target mode among vibrations that are measured in a reference period; and a diagnosis unitthat diagnoses that a change has occurred in the structurebetween the diagnosis period and the reference period based on a result of comparison between a distribution of pieces of reference relationship information and the distribution that has been calculated in relation to the pieces of comparative relationship information.

Diagnosis apparatus, diagnosis method, and computer-readable recording medium

An assessing device capable of assessing presence or absence of local damage in a structure is provided. The assessing device includes a dominant frequency identifying unit that identifies a dominant frequency of a vibration at each of a plurality of spots in a structure, based on information indicating the vibration at each of the plurality of spots, a phase difference identifying unit that identifies a phase difference at the dominant frequency between the vibrations at the plurality of spots, based on the dominant frequency and information indicating the vibrations; and an assessing unit that assesses damage in the structure, based on the phase difference.

Assessing device, assessing system, assessing method, and computer-readable recording medium

A first time difference calculation unit calculates a time difference &#x394;tbetween the timing of detection of vibration that indicates the first vibration mode of a pipe P and the timing of detection of vibration that indicates a second vibration mode of the pipe P by processing a result of a measurement . A second time difference calculation unit calculates a time difference &#x394;tbetween the timing of detection of vibration that indicates the first vibration mode of the pipe P and the timing of detection of vibration that indicates the second vibration mode of the pipe P by processing a result of another measurement. A leakage position calculation unit uses the time differences &#x394;t, &#x394;t, and a space interval I between the first vibration detection unit and the first time difference calculation unit to calculate a leakage position in the pipe P.

Leakage position calculation device, leakage position calculation method, computer-readable recording medium, vibration calculation device, and computation device

A breakdown prediction device of the present invention includes: a vibration measurement unit that measures vibrations generated from a device being monitored; and a signal processing unit that performs breakdown prediction when a specific vibration is measured at the vibration measurement unit, a maximum vibration amplitude value of the vibration exceeding an upper limit vibration amplitude threshold, and a vibration amplitude value thereof being below a lower limit vibration amplitude threshold at a point in time when a specified time is reached from a point in time when the vibration exceeds the upper limit vibration amplitude threshold.

Breakdown prediction device, breakdown prediction method, and breakdown prediction program

A failure prediction system for performing failure prediction to a monitoring target device by detecting a state, comprising: a state detection unit for detecting state signals of no smaller than two different kinds, and outputting a detection signal corresponding to each of the state signals; a phase processing part for synchronizing a plurality of the detection signals; a signal analysis part for calculating a feature value indicating a feature of the state for each of the detection signals from the phase processing part; and a failure prediction part for performing failure prediction of the monitoring target device for each of the feature values by comparing the feature value in question and a reference value set in advance.

Failure prediction method and failure prediction system

A structure for attaching a vibration sensor to a storage device having a recording or reproducing head that records on or reproduces from a recording medium, includes: a first vibration sensor which is provided on a first outer surface of a base of the storage device, and detects vibration in a direction perpendicular to a surface of the recording medium; a second vibration sensor which is provided on a second outer surface of the base, the second surface orthogonal to the first outer surface, and detects vibration in an in-plane direction of the recording medium; an urging section which has a first end portion in contact with an upper surface of the first vibration sensor and a second end portion in contact with an upper surface of the second vibration sensor, and has a substantially L-shape; and a damping member affixed to the urging section.

Structure for attaching vibration sensor to storage device

An electromagnetic relay is provided which is small in size and is capable of controlling two circuits of an ordinarily-open contact, which has a large current-carrying capacity and high interrupting capability, and which is excellent in resistance against shock and vibration. Movable contactors are held, through bow-shaped movable contactor springs, to two-shaped holding frames each being electrically separated and being mechanically connected via a card made of a highly heat-resistant resin in a card block. Thick-plate shaped movable contacts, which are attached to the movable contactors in a fixed manner, are electrically connected or disconnected to fixed contacts in a base block, in synchronization with operations of an armature of an electro-magnet block. In order to improve a current-carrying capability and interrupting capability, there are provided two pieces of ordinarily-open contacts which are connected in series to each other, and between which an interval is doubled, in each of two circuits.

Electromagnetic relay

A variable optical attenuator comprises an incoming fiber for propagating an incoming light beam, a mirror for reflecting the incoming light beam as a reflected light beam and an outgoing fiber for propagating as an outgoing light beam at least one part of the reflected light beam. The light intensity of the outgoing light beam is determined by the angle of reflection at the mirror. The angle of reflection at the mirror is adjusted by an actuator for rotating the mirror. The actuator comprises a plate, a coil, a housing and permanents magnets. The mirror and the coil are fixed on the plate. The housing supports the plate so that the plate is able to rotate around a rotation axis, which is included on a predetermined plane. The permanent magnets are fixed on the housing and generate predetermined magnetic flux density along the predetermined plane. When a driving current is supplied to the coil under the predetermined magnetic flux density, a Lorentz force occurs at the coil so as to rotate the coil. Together with the coil, the mirror rotates so that the light intensity of the outgoing light beam can be adjusted.

Growing community of inventors

Tokyo, Japan

Shigeru Kasai