Razvoj in analiza dinamičnega tlačnega generatorja z zvočnikom

Štefe, Metka (author), Kutin, Jože (mentor)

V magistrskem delu smo razvili, izdelali in analizirali merilni sistem z dinamičnim tlačnim generatorjem, ki bo omogočal raziskave frekvenčnih lastnosti tlačnih povezovalnih cevk. Razviti dinamični tlačni generator sestavlja en elektrodinamični zvočnik, s katerim generiramo stabilne in nastavljive periodične tlačne spremembe znotraj zračne komore, omejene z ohišjem sistema. Pri dimenzioniranju štirih merilnih mest za odjem tlaka smo upoštevali dimenzijske lastnosti uporabljenih piezoelektričnih merilnikov tlaka in drugih priključnih elementov. Zračno komoro smo načrtovali z dovolj veliko prostornino, da je njen vpliv na določevanje frekvenčnih lastnosti povezovalnih cevk relativno majhen. V programskem okolju LabVIEW smo izdelali nadzorni program, ki omogoča računalniško podprta merjenja. S pomočjo preizkusov smo določili amplitudne in fazne frekvenčne značilnice dinamičnega tlačnega generatorja s pripadajočim tlačnim merilnim sistemom. V frekvenčnem območju od 1 do 500 Hz so amplitudni oz. fazni dinamični merilni pogreški tlačnih merilnih signalov znotraj 1,1 % oz. 0,6°.

• Language: Slovenian
• Keywords: dinamični tlačni generator, elektrodinamični zvočnik, merjenje tlačnih sprememb, piezoelektrični merilni sistem, amplitudno frekvenčna značilnica, fazno frekvenčna značilnica, dinamični merilni pogrešek
• Work type: Master's thesis/paper
• Organization: FS - Faculty of Mechanical Engineering
• Year: 2017
• PID: 20.500.12556/RUL-92377
• Publication date in RUL: 26.05.2017

Secondary language

• Language: English
• Title: Development and analysis of a dynamic pressure generator with a loudspeaker

Abstract

In this master thesis we developed, constructed and analyzed the measurement system with a dynamic pressure generator, which will be used in investigations of frequency characteristics of pressure connecting tubes. The developed dynamic pressure generator consists of one electrodynamic loudspeaker that generates stable and adjustable periodic pressure pulsations inside the air chamber limited with the housing of the system. Dimensions of the pressure measuring ports were determined by taking into account dimensional characteristics of the piezoelectric pressure sensors and other connecting elements. The air chamber was designed with sufficiently large volume in order to minimize its effects on determination of frequency characteristics of the connecting tubes. In the LabVIEW programming environment we prepared a control program for computer supported measurements. We experimentally determined the amplitude and phase frequency characteristics of the dynamic pressure generator with associated pressure measuring system. In the frequency range from 1 to 500 Hz the amplitude and phase dynamic measurement errors of the pressure measure signals do not exceed 1.1 % and 0.6°, respectively.

• Keywords: dynamic pressure generator, electrodynamic loudspeaker, pressure pulsations measurement, piezoelectric measurement system, amplitude frequency characteristic, phase frequency characteristic, dynamic measurement error