Karakterizacija vibroakustičnega odziva toplotne črpalke

Cvikl, Miha (author), Čepon, Gregor (mentor), Boltežar, Miha (co-mentor)

Pri toplotnih črpalkah z zračnim uparjalnikom poleg energijske učinkovitosti predvsem vibracije in hrup predstavljajo enega izmed ključnih dejavnikov, ki pričajo o kakovosti naprave. Vibracije vplivajo tako na strukturni hrup kot tudi na življenjsko dobo naprave. Glavni vir mehanskih vibracij v toplotni črpalki predstavlja kompresor. V sklopu naloge je bil razvit merilni sistem, s katerim smo na osnovi izmerjenih frekvenčno prenosnih funkcij določili lastne frekvence ter identificirali parametre kinematskega vzbujanja kompresorja. Odziv sistema cevnega sklopa na vzbujanje kompresorja smo simulirali z uporabo razvitega modela na osnovi metode končnih elementov ter preko meritev izvedli validacijo modela. Pri tem smo predpostavili, da je sistem linearen in da kompresor sistem vzbuja v obliki kinematskega vzbujanja s harmonsko funkcijo. S simulacijami smo izračunali amplitudne pomike in napetosti pri dani frekvenci obratovanja kompresorja. Na osnovi izvedenih simulacij smo identificirali kritična območja obratovanja naprave in na koncu podali tudi ukrepe v smeri zmanjšanja vibracij ter s tem posledično tudi hrupnosti naprave.

• Language: Slovenian
• Keywords: toplotne črpalke, vibroakustična optimizacija, simulacija odziva, lastne frekvence, meritev vibracij, amplituda napetosti
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [M. Cvikl]
• Year: 2019
• Number of pages: XXII, 56 str.
• PID: 20.500.12556/RUL-109841
• UDC: 621.577:534.83(043.2)
• COBISS.SI-ID: 16916763
• Publication date in RUL: 09.09.2019

Secondary language

• Language: English
• Title: Characterization of heat pump’s vibroacoustic response

Abstract

For air-to-water heat pumps, along with the energy efficiency, vibration and noise are one of the key factors that indicate to the quality of the device. Vibrations affect both the structural noise and the life-time of the device. The main source of mechanical vibration in the heat pump presents the air compressor. In this master thesis, a measuring system was developed to determine the natural frequencies and to deduce the kinematic excitation parameters of the compressor. The response of the pipe system attached to the compressor was simulated using the developed model on the basis of the finite element method. The numerical model was validated based on the measurement. Here we assumed that the system is linear and that the compressor excites the system in the form of kinematic excitation with a harmonic function. On the basis of the preformed simulations, we identified the critical operating conditions of the device and finally present measures to reduce the amplitude of vibrations and consequently the noise of the device.

• Keywords: heat pumps, vibroacoustic optimization, response simulation, natural frequencies, vibration measurement, amplitude stress