Merjenje udarne sile na podlagi meritve pospeška

Drab, Jan (author), Slavič, Janko (mentor)

V prvem delu zaključne naloge smo obravnavali merjenje udarne sile s silomerom in pospeškomerom. Na udarnem kladivu sta bili hkrati nameščeni obe zaznavali. Da bi iz izmerjenega pospeška dobili impulz sile, smo morali določiti korekcijski faktor, s katerim je potrebno pospešek pomnožiti. Kladivo smo testirali s tremi udarnimi konicami različnih trdot in za vsako izračunali korekcijski faktor. Ugotovili smo, da je le-ta za vsako konico različen. Drugi del naloge obsega uporabo MEMS pospeškomera in primerjavo dobljenega signala s signalom profesionalnega referenčnega pospeškomera. Signal MEMS pospeškomera smo pridobili preko platforme Arduino, signal profesionalnega pospeškomera pa s programom LabView. Nato smo primerjali izrisana grafa obeh signalov in ugotovili, da pri MEMS senzorju pride do napake, potem ko pospešek doseže amplitudo. Tekom naloge smo določili faktorje, s katerimi moramo korigirati signal MEMS pospeškomera, da dobimo čim bolj natančen impulz sile. Za vse pridobljene signale smo naredili tudi Fourirerovo transformacijo in dobili sliko v frekvenčni domeni.

• Language: Slovenian
• Keywords: Udarna sila, impulz sile, merjenje pospeška, frekvenčna analiza, procesiranje signala, primerjava signalov.
• Work type: Final paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Publisher: [J. Drab]
• Year: 2018
• PID: 20.500.12556/RUL-103272
• UDC: 004.942:519.876.5(043.2)
• COBISS.SI-ID: 16412699
• Publication date in RUL: 15.09.2018

DRAB, Jan, 2018, Merjenje udarne sile na podlagi meritve pospeška [online]. Bachelor’s thesis. J. Drab. [Accessed 14 April 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=103272

Secondary language

• Language: English
• Title: Acceleration based impact force measurement

Abstract

In the first part of the final paper we dealt with the measurement of the impact force with the force and the acceleration sensor. Both sensors were installed on the impact hammer at the same time. In order to obtain the impulse of the force from the measured acceleration, we had to determine the correction factor by which the acceleration should be multiplied. We tested the hammer with three impact tips of different hardnesses and calculated correction factors for each one. We have found that it differs for each tip. The second part of the paper includes the application of the MEMS accelerometer and the comparison of the signal obtained with the signal of a professional reference accelerometer. We obtained the MEMS accelerometer's signal via the Arduino platform and the professional accelerometer's signal via LabView program. We then compared the graphs of the two signals and found that an error occurs in the MEMS sensor after the acceleration has reached it's amplitude. During the course of the task, we determined the factors by which the MEMS accelerometer’s signal must be corrected to obtain the most exact impulse of the force. For all acquired signals, we also did a Fourier transformation and obtained an image in the frequency domain.

• Keywords: Impact force, impulse of force, acceleration measurement, frequency analysis, signal processing, signal comparison.