Nec Corporation

Yu Kiyokawa

Shigeru Kasai

Shohei Kinoshita

Takahiro Toizumi

Kazutoshi Sagi

Sakiko Mishima

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 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

Provided are a sound model generation device and the like that make it possible to more easily generate a sound model capable of distinguishing sound events using a plurality of features. A concatenating unit concatenates a plurality of features of sound signals that are learning data and generates a concatenated feature. A learning unit learns the generated concatenated feature for generating a sound model for distinguishing a sound event from a sound signal.

Sound model generation device, sound model generation method, and 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.

Growing community of inventors

Tokyo, Japan

Yu Kiyokawa