Nec Corporation

Masatake Takahashi

Yasuhiro Sasaki

Junichiro Mataga

Yasuharu Onishi

Shigeki Shinoda

Shin Tominaga

Ukyo Mori

Yukio Murata

Hirofumi Inoue

Jun Kuroda

Shohei Kinoshita

Hiroshi Sakai

Yukio Yokoyama

Nozomi Toki

Jun Sakai

Shigeo Satou

Dai Kobayashi

Shigeru Kasai

Mizuho Tomiyama

Hiromi Yamamoto

Soichiro Takata

Nobuhiro Mikami

Manabu Kusumoto

Mizuki Iwanami

Takahiro Kumura

Tetsuya Yoshinari

A facility state analyzing device includes: a measurement unit that measures a load on a facility and generates, based on a measurement condition, load information representing the load being measured; an extraction unit that extracts, from the load information generated by the measurement unit, dynamic load information representing a dynamic component of the load whose dynamic fluctuation degree with a lapse of time is equal to or more than a reference; a measurement condition determination unit that determines, based on temporal transition of the dynamic load information, the measurement condition indicating a time zone during which the load information is generated; and an analysis unit that analyzes the load applied on the facility, by using the load information generated based on the measurement condition, to efficiently increase accuracy in estimating the state of the facility on the basis of a situation of the load applied to the facility.

Facility state analyzing device, facility state analyzing method, and recording medium storing facility state analyzing program thereon

A state analysis device is capable of determining a state of the interior of piping with high precision, and includes: an index calculation means for deriving an index indicating the state of the piping, based on a flow speed of fluid flowing out of the piping, and a fluid pressure of the interior of the piping at two or more locations of the piping; and a determination means for determining the state of the piping, based on the index.

State analysis device, state analysis method, and recording medium

This invention provides the following: a diagnostic device that may, with a simple design, diagnose the condition of a wide area of a structure such as a pipe; and the like. The diagnostic devicehas a determining means for determining the condition of the structure on the basis of the speed of sound therein.

Diagnostic device, diagnostic system, diagnostic method, and computer-readable recording medium

Provided are a position determination device and the like which determine vibration measurement positions for specifying a leak position. A position determination deviceincludes a feature amount extraction unit which extracts feature amounts relating to detected pipe vibrations respectively on the basis of the pipe vibrations detected by a plurality of detection units, and a measurement position determination unit which determines measurement positions of at least two of the detection units on the basis of the feature amounts.

Position determination device, leak detection system, position determination method, and computer-readable recording medium

In order to keep the deterioration of water distribution pipes from progressing, a tap water management system is provided with: a water pressure detection unit for detecting the water pressure in at least one location in a water distribution pipe for carrying clean water from a water distribution site to a consumer. and transmitting the detection result as water pressure information; a deterioration detection unit for detecting deterioration in at least one location in a water distribution pipe, and transmitting the detection result as deterioration information; a water distribution planning unit for causing a water distribution plan that is a plan for water distribution pressure to be determined on the basis of information regarding past water demand; a deterioration-reducing water distribution planning unit for deciding, on the basis of the water distribution plan, the water pressure information, and the deterioration information. a deterioration-reducing water distribution plan according to the extent of deterioration; a water distribution pressure changing unit for changing the water distribution pressure of the water distribution pipe; and a water distribution pressure control unit for controlling the water distribution pressure changing unit on the basis of the deterioration-reducing water distribution plan.

Tap water management system, tap water management device, tap water management method, and tap water management program recording medium

Provided are a position determination device and the like for determining a mounting position of a sensor suitable for detecting leakage vibration of a pipe. A position determination device () includes a frequency determination unit for determining a frequency of vibration propagating through a pipe and a structure attached to the pipe and a mounting position determination unit for determining, on the basis of the determined frequency, a mounting position of a sensor for detecting vibration of the pipe.

Position determination device, position determination system, position determination method, and computer-readable recording medium

In a related fluid leakage detecting device, erroneous leakage determination may occur due to a change in a state of a fluid in piping. A leakage determination system of the present invention includes a first detection means for detecting a prescribed physical quantity indicating a state of a fluid in piping, a second detection means for detecting vibration propagating through the piping, and a leakage determination means for performing leakage determination based on the physical quantity detected by the first detection means and the vibration detected by the second detection means.

Leakage determination system and leakage determination method

Each functional configuring unit of a leak inspection device () operates in the manner that follows. A vibration acquisition unit () acquires a signal indicating tubing vibrations or vibrations propagated from tubing. A filtering unit () extracts a signal of a predetermined frequency band from the signal acquired by the vibration acquisition unit (). A characteristic value extraction unit () splits the signal extracted by the filtering unit () into predetermined time intervals, calculates for each split signal the absolute value of each extreme value of the magnitude of the signal, performs for each split signal a statistical process with respect to the calculated plurality of absolute values, and considers values calculated by the statistical process to be characteristic values. A leak determination unit () considers inspection results to indicate the presence of a leak when a determination index value stipulated using the characteristic values is greater than a predetermined threshold.

Leak inspection device, leak inspection method, and leak inspection program

A sensor device includes: a first sensor group () in which a plurality of first vibration sensors for detecting vibration acceleration in one direction with respect to an object to be detected are arranged to face the same direction; a phase difference calculation unit () which, based on a plurality of first signals indicating the vibration acceleration detected by each of the plurality of first vibration sensors included in the first sensor group (), calculates a first phase difference indicating the phase difference between the plurality of first signals; and an acceleration calculation unit () which, using the first phase difference and the plurality of first signals, calculates vibration acceleration in a first direction perpendicular to a surface on which the plurality of first vibration sensors are arranged, and vibration acceleration in a second direction parallel to the surface on which the plurality of first vibration sensors are arranged.

Sensor device, vibration detection system, sensor unit, information processing device, vibration detection method, and program

Disclosed is a structure analyzing device and a structure analyzing method which can analyze a state change of a structure, which is caused before the structure is destroyed, such as a state change of degradation of the structure or the like. A structure analyzing device () includes a vibration detecting unit () which detects a vibration of a structure, and an analysis unit () which analyzes an output signal of the vibration detecting unit (). The analysis unit () analyzes a state change of the structure by comparing a value of resonant sharpness Q, which is measured by use of the following formula (1) in a state existing when carrying out analysis, with a value of resonant sharpness Q which is measured by use of the following formula (1) in a standard state.

Structure analyzing device and a structure analyzing method

The present invention provides a defect analysis device including: an excitation unit () that imparts vibrations of a plurality of frequencies to a fluid () flowing through a pipe (); a first detector () that, when the excitation part () is imparting vibrations, detects vibrations emanating from the pipe (); and a signal processing unit () that extracts a feature quantity from a vibration waveform acquired by the first detector (), and uses the extracted feature quantity to estimate the extent of a defect formed in the pipe ().

Defect analysis device, defect analysis method, and program

A vibration detection device () is provided with a vibration detection unit (), a sensor-side leak determination unit (), a first transmission unit (), and a second transmission unit (). The vibration detection unit () detects vibration transmitted through piping (). The sensor-side leak determination unit () determines whether or not there is a possibility of a leak in the piping () based on a measurement result of the vibration detection unit (). When the sensor-side leak determination unit () determines that there is a possibility of a leak, the first transmission unit () transmits provisional leak information to an information processing device (). The provisional leak information indicates that there is a possibility of a leak in the piping (). When waveform request information indicating a request for waveform data of the vibration is received from the information processing device (), the second transmission unit () transmits waveform data measured by the vibration detection unit () to the information processing device ().

Leak detection system, vibration detection device, information processing device, and leak detection method

A leak detection device is provided which comprises: in order to suppress effects of extraneous vibration and improve accuracy of leak detection, a first detection unit () which detects vibration in a first direction and output a first signal Srepresenting a magnitude of the vibration in the first direction, the first detection unit () being installed to a pipe () in which fluid () flows; a second detection unit () which detects vibration in a second direction different from the first direction and output a second signal Srepresenting a magnitude of the vibration in the second direction, the second detection unit () being installed to the pipe (); and a signal processing unit () which performs an arithmetic operation processing using the first signal Sand the second signal S

Leak detection device, leak detection method and program

A signal acquisition unit () acquires a signal. From the signal acquired by the signal acquisition unit (), a detection signal extraction unit () extracts, as a detection signal, a signal of any frequency band among a plurality of partial detection frequency bands into which the frequency band that is the subject of detection has been divided. A determination unit () determines, in order, for each detection signal corresponding to each of the different partial detection frequency bands, whether the detection signal shows any leakage, and if at least a prescribed number of the detection signals are not showing any leakage, determines that leakage is not taking place.

Leak-detection device, program, and control method

A sensor unit () provided with a substrate (), a plurality of light-receiving units () that are provided on the substrate () and detect light, and a diffraction grating layer () that is provided on the substrate () and the light-receiving units () and has at least two diffraction means for diffracting light of corresponding wavelengths and condensing the light onto the light-receiving units, wherein at least two of the diffraction means are composed from holograms formed on a first diffraction grating layer and at least a portion of the plurality of holograms formed on the first diffraction grating layer overlap at least partially with another adjacent hologram.

Growing community of inventors

Tokyo, Japan

Masatake Takahashi