Določitev časa trajanja trka s pomočjo laserske odklonske sonde

Rus, Janez (author), Petkovšek, Rok (mentor), Požar, Tomaž (co-mentor)

V magistrskem delu smo predstavili novo metodo merjenja časov trajanja trkov majhnih kroglic s stekleno kocko. Metoda temelji na meritvi odklona laserskega žarka zaradi deformacije steklene kocke na mestu trka. Predstavljen je pregled literature na področju merjenja lastnosti trkov in opravili smo primerjavo do sedaj uporabljenih metod merjenja kontaktnih časov. Predstavljen je teoretični izračun časa trajanja trka s pomočjo Hertzove kontaktne teorije. Rezultate meritev smo primerjali z analitično dobljenimi vrednostmi. Predstavili smo tudi praktično uporabo izmerjenega časa trajanja trka. Opisana je frekvenčna kalibracija piezoelektričnega senzorja, izvedena na dva načina: pri prvem načinu smo za izračun prenosne funkcije senzorja uporabili analitično, pri drugem pa eksperimentalno določen čas trajanja trka.

• Language: Slovenian
• Keywords: čas trajanja trka laserska odklonska sonda laserski merilni sistemi ultrazvočni valovi kalibracija piezoelektričnega senzorja
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [J. Rus]
• Year: 2018
• Number of pages: XXII, 56 str.
• PID: 20.500.12556/RUL-102250
• UDC: 519.6:681.7.069.24(043.2)
• COBISS.SI-ID: 16166683
• Publication date in RUL: 27.07.2018

Secondary language

• Language: English
• Title: Measurement of impact contact time with a laser beam deflection probe

Abstract

In this master thesis, a new method for measuring the contact times when a small balls impact on the glass cube is presented. The method is based on the laser beam deflection due to the deformation of the glass cube at the impact location. Literature survey on the impact duration measuring methods is presented. We described the analytical determination of the impact contact with the use of the Hertz elastic contact theory. The measured contact times are compared with the analytical. Practical application of the measured impact contact times is presented. Its implementation for frequency calibration of piezoelectric displacement sensor is described. We calculated the sensor transfer function in two ways: firstly, we used an analytically derived and, secondly, an experimentally measured impact contact time.

• Keywords: impact duration beam deflection probe laser measurement systems ultrasonic waves piezoelectric sensor calibration