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Detection damage in bearing system of jet engine using the vibroacoustic method

Żokowski M., Majewski P., Spychała J.

Acta Mechanica et Automatica

2017

Vol. 11, no. 3

237--242

The article discusses typical, operational systems for monitoring vibrations of jet engines, which constitute the propulsion of combat aircraft of the Armed Forces of the Republic of Poland. After that, the paper presents the stage of installing vibration measuring sensors in the direct area of one of the jet engine bearings, which is a support system for its rotor. The article discusses results of carried out analyses of data gathered during tests of the engine in the conditions a jet engine test bed. Results of detecting damages to the bearing, using sensors built in the direct area will be presented.

Determination of the thickness and optical constants of transparent indium-doped ZnO thin films by the envelope method

Ilican S., Caglar M., Caglar Y.

Materials Science Poland

2007

Vol. 25, No. 3

709--718

Transparent indium-doped ZnO thin films were deposited by the spray pyrolysis method onto glass substrates. The content of indium in the starting solution was 0.5 at. %. The crystallographic structure of the film was studied by X-ray diffraction (XRD). XRD measurement shows that the film is crystallized in the wurtzite phase and presents a preferential orientation along the c-axis. The texture coefficient (TC), grain size value and lattice constants have been calculated. The absorption coefficient and the thickness of the films were calculated from interference of transmittance spectra. Optical constants such as the refractive index n and extinction coefficient k have been determined from transmittance spectrum in the ultraviolet-visible-near infrared (UV-VIS-NIR) regions using the envelope method. The thickness of the films strongly influences the optical constants.