Fuji Jukogyo Kabushiki Kaisha

Subaru Corporation

The University of Tokyo

Hitachi Cable, Inc.

Toshimichi Ogisu

Norio Ando

Masato Nomura

Nobuo Takeda

Seiji Kojima

Daisuke Hirabayashi

Noritsugu Nakamura

Hideki Sekine

Tomonaga Okabe

Kei Suzuki

Yoichi Sato

Hideki Soejima

Marosuke Kikuchi

Takafumi Adachi

Toshimasa Kobayashi

Haruka Miyanishi

Toru Onishi

Masakazu Shimanuki

Yuki Matsuda

Kojima Seiji

A manufacturing assistance apparatus includes a learning unit and an estimator. The learning unit is configured to load a plurality of pieces of actual measurement data in each of which a gap and a plurality of parameters are associated with each other, and construct an estimation model on the basis of machine learning in which the plurality of pieces of actual measurement data serve as teacher data. The gap is provided between a first workpiece and a second workpiece that eventually structure an airframe of an aircraft and that are eventually fastened to each other. The estimation model estimates the gap from the plurality of parameters. The estimator is configured to derive an estimation value of a length of the gap on which measurement has not yet been performed, on the basis of the estimation model constructed by the learning unit and the plurality of parameters.

Manufacturing assistance apparatus

An electric aircraft includes a propeller, an electric motor, and a controller. The electric motor is configured to supply power to the propeller. The controller is configured to control the electric motor. The controller is disposed inside a leading-edge portion of a wing to cause heat to be transmitted to a skin of the wing. The heat is generated by the controller when the controller controls the electric motor.

Electric aircraft and anti-icing apparatus for electric aircraft

An optical inspection system includes an optical fiber sensor, an optical filter, a signal processor, and a corrector. The optical fiber sensor outputs a first optical signal having a temporal change in a wavelength corresponding to a temporal change in an amplitude of a vibration propagating in an inspection target object or a temporal change in a displacement of the inspection target object. The optical filter converts the first optical signal into a second optical signal having a temporal change in an intensity. The signal processor acquires inspection information on the inspection target object on the basis of the second optical signal. The corrector corrects a correspondence relationship between the temporal change in the wavelength and the temporal change in the intensity by changing a wavelength characteristic of the optical filter. The correspondence relationship is directed to converting the first optical signal into the second optical signal.

Optical inspection system, optical inspection method, and aircraft structure

Disclosed is a laser peening apparatus, including: a liquid holding head to shape and hold liquid to trap plasma on a local surface of a workpiece; and a laser irradiation head to irradiate the surface with laser through the liquid held in the liquid holding head.

Laser peening apparatus

An element splitting method to be applied to a finite element analysis. The method includes: splitting the object region by a Delaunay triangulation by using the coordinate of the point on the boundary line, as a nodal point; disposing circles not to intersect with one another, in the object region, by a Monte Carlo method, the Lawson's search algorithm and a predetermined function; provisionally moving the center coordinate of the one circle by specifying six circles having minimum intervals from one circle by the Monte Carlo method, to adopt the center coordinate after movement when the value of the degree of dispersion &#x3a6; after the movement falls below that before the movement; and splitting the object region by a Delaunay triangulation by using the coordinate of the point on the boundary line and the center coordinate, as nodal points.

Element splitting method, element splitting arithmetic device and damage extension analysis device

Disclosed is an impact detection system including: an optical fiber including a plurality of sensor sections to reflect light, a wavelength band of the reflected light vibrates depending on an elastic wave propagating through a subject to be inspected; a light source to input light into the optical fiber; optical filters each connected to an output terminal of the optical fiber; and an arithmetic processing unit to detect the impact from output values of sensor sections, wherein the wavelength bands of the sensor sections in the optical fiber are distributed such that the vibration bands caused by the impact to be detected do not overlap with each other, and a pass band of the optical filter corresponding to one of the sensor sections is distributed in the vibration band caused by the detection object, and is distributed in both sides of a center of the wavelength band of the one sensor section.

Impact detection system using an optical fiber sensor

Disclosed an impact detection system including: three or more optical fiber sensors disposed respectively in different positions, the sensors not being in alignment with one another, in which the sensors each includes a core portion to have a grating portion formed therein, the grating portion has a plurality of gratings; light source; two or more optical filters having different pass bands to one another to an output light of one of the optical fiber sensors; and an arithmetic processing apparatus to perform arithmetic processing of output values of the three or more optical fiber sensors through the optical filters so as to specify a position on the subject where an impact is loaded, the output values being obtained when the impact is loaded on the subject.

Impact detection system with three or more optical fiber sensors

A bonded part peeling shape identification device includes: a processor for obtaining measurement value information indicating a spectrum from an output light of an optical fiber sensor arranged in a bonded part, the optical fiber sensor outputting a light in which the spectrum is changed according to a strain; for carrying out a first shape identification calculation using a strain calculated based on the measurement value information, and a second shape identification calculation by a spectral shape of the output light based on the measurement value information; and for identifying a peeling shape of the bonded part based on an identification result of the first shape identification calculation and an identification result of the second shape identification calculation.

Bonded part peeling shape identification device

A damage detection system including: a optical fiber sensor including a core portion to have a grating portion formed therein, the grating portion having gratings reflecting light, wherein a wavelength band of the reflected light changes when a distance between adjacent gratings changes; a light source to input broadband light into the core portion; two optical filters connected to an output end of the sensor; and an apparatus to perform arithmetic processing on output values of the optical filters, wherein each passband of the optical filters overlaps with the vibration range of the wavelength band, in which a center wavelength of one of the passbands is fixed to an upper area of a vibration center of a center wavelength of the reflected light and that of the other of the passbands is fixed to a lower area thereof.

Damage detection system

A modular sensor for damage detection with an optical fiber (FBG sensor) to detect a damage of a composite material, having a high level of visibility and manageability, and its manufacturing method is described. A structural composite material embedded with this modular sensor for damage detection is also described.

Modular sensor for damage detection, manufacturing method, and structural composite material

A composite material has a laminated structure of fiber-reinforced resin layers and films of a shape-memory alloy. A predetermined strain has been applied to each film. A damage sensor has a film of an alloy of nickel and titanium. An electric circuit is bonded to the film, and strain gages are connected to the electric circuit. The damage sensor can be laminated to the resin layers in place of the film of the shape-memory alloy. Damage to the composite material is suppressed as follows: A current is applied to the films of the shape-memory alloy, to monitor change in electric resistance of the films. The damage is located in response to the change in electric resistance. Another current is applied to a film of the shape-memory alloy for which the change is larger than the other films to generate heat for deforming the film to generate shrinking stress or shear stress to the damage.

Composite material and method of controlling damage thereto and damage sensor

Damage caused to a structural composite material is detected while reduction in the strength thereof is prevented. A damage detection systemfor a structural composite material includes a vibration application apparatusincluding: a sheet body; a plurality of piezo elementssprinkled throughout and held by the sheet body; and wiresfor the piezo elementsprovided to the sheet body. The damage detection systemalso includes: a fiber optic sensorwhich includes a grating portionin a core portionthereof, the grating portionreflecting light of a predetermined wavelength; a light source to perform light irradiation onto the core portion; and a characteristic detection unitto detect a characteristic of the light reflected from the grating portion

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Tokyo, Japan

Toshimichi Ogisu