Merilni sistem za frekvenčno analizo vibracij

Blažič, Marko (author), Trost, Andrej (mentor)

Meritve in analiza vibracij so pomembne za nadzor kakovosti proizvodnje elektromotorjev. Frekvenčna analiza vibracij nam omogoča natančno ugotavljanje morebitnih neustreznih delov in posledično neustreznih elektromotorjev. V nalogi je predstavljen koncept merilnega sistema za vibracije z uporabo razvojne plošče Zedboard, na kateri teče operacijski sistem FreeRTOS. Predstavljena je obdelava signala v časovnem in frekvenčnem prostoru. Posebnost Zedboarda je v tem, da temelji na sistemu na integriranem vezju (ang. System On Chip) Xilinx Zynq. Zmogljiv procesor nam omogoča poganjanje operacijskega sistema, programirljiva logika pa omogoča izvajanje časovno potratnih opravil. Zajem in obdelava signala je izvedena za en kanal. Predstavljena je frekvenčna analiza, uporaba okenskih funkcij z vplivi na rezultate. Prav tako je prikazan postopek povprečenja in prekrivanja frekvenčnih spektrov. Predstavljen je tudi izračun RMS (ang. Root Mean Square) vrednosti vibracij v posameznih frekvenčnih pasovih. Na koncu je primerjava meritev izdelanega merilnega sistema z profesionalnim merilnim sistemom LMS Scadas.

• Language: Slovenian
• Keywords: sistem na čipu, FPGA, Xilinx Zynq, FreeRTOS, FFT, okenske funkcije, vzorčenje
• Work type: Master's thesis/paper
• Organization: FE - Faculty of Electrical Engineering
• Year: 2016
• PID: 20.500.12556/RUL-84522
• Publication date in RUL: 29.08.2016

Secondary language

• Language: English
• Title: Vibration measurement system with frequency analysis

Abstract

Vibration measurment and analysis is important for monitoring the quality of production of electromotors. With frequency analysis of vibrations we are able to to detect bad units and also determine the part of electromotor wich is the source of failure. In this master thesis I presented the concept of measurment system based on Zedboard development board, with instaled FreeRTOS operating system. Also signal procesing in time and frequency domain is presented. Speciality of Zedboard is that it is based on Xilinx Zynq System On Chip (SoC). Powerfull dual core microprocessor is able to run operating system and at the same time programable logic allow us to run time consuming tasks. Sampling and signal processing is done for one chanell at the moment. Frequency analysis is presented with windowing functions and their influence on results. Then avaraging and overlapping of frequency spectras is presented. Next RMS (Root Mean Square) calculation is used for calculating power in three separated frequency bands. At the end the comparison between made measuring system and professional measuring system LMS Scadas is done.

• Keywords: system on chip, FPGA, Xilinx Zynq, FreeRTOS, FFT, windowing functions, sampling