An experimental study on off-design performance and noise in small pumps

Download

index.pdf

Date

2007

Author

Şahin, Fatma Ceyhun

Metadata

Show full item record

Item Usage Stats

130
views

70
downloads

This thesis study is focused on experimentally investigating pump noise at design and off-design operations and its relations with pressure fluctuations. Small size pumps are placed in a semi-anechoic chamber and operated at various system conditions and various rotational pump speeds. Pump operational data, noise data and time dependent pressure data are recorded. Fast Fourier Transform spectra of noise and pressure data are compared. Coherence spectrum between sound pressure level and hydraulic pressures are obtained. Data processing, Fast Fourier Transform and cross correlation are conducted with specific software Soundbook SAMURAI. The experiments have indicated that system characteristics or pump size do not have any influence on the noise of pump. On the other hand, pump characteristics are found to be distinguishable by means of peak frequencies on the sound spectra which are proportional to blade passing frequency. Results of cross correlations also show that, pump outlet pressure is a more significant source of noise than pump inlet pressure.

Subject Keywords

Sound., Sound.

URI

http://etd.lib.metu.edu.tr/upload/12608418/index.pdf
https://hdl.handle.net/11511/16797

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Computer simulation of grain boundary grooving and cathode voiding n bamboo interconnects by surface diffusion under capillary and electromigration forces Akyıldız, Öncü; Oğurtanı, Tarık Ö.; Department of Metallurgical and Materials Engineering (2004) The processes of grain boundary grooving and cathode voiding which are important in determining the life times of thin films connecting the transistors in an integrated circuit are investigated by introducing a new mathematical model, which flows from the fundamental postulates of irreversible thermodynamics, accounting for the effects of applied electric field and thermal stresses. The extensive computer studies on the triple junction displacement dynamics shows that it obeys the first order reaction kinet...
Cepstral deconvolution method for measurement of absorption and scattering coefficients of materials Aslan, Gökhan; Çalışkan, Mehmet; Department of Mechanical Engineering (2006) Several methods are developed to measure absorption and scattering coefficients of materials. In this study, a new method based on cepstral deconvolution technique is proposed. A reverberation room method standardized recently by ISO (ISO 17497-1) is taken as the reference for measurements. Several measurements were conducted in a physically scaled reverberation room and results are evaluated according to these two methods, namely, the method given in the standard and cepstral deconvolution method. Two meth...
Growth and characterization of thin sio2 and ta2o5 dielectric layers nd : yag laser oxidation Aygün Özyüzer, Gülnur; Turan, Raşit; Department of Physics (2005) Our aim was to establish a methodology for laser assisted oxidation of semiconductor and metal surfaces. One advantage of laser oxidation is the fact that radiation is heavily absorbed in a thin surface layer of the sample and the other is its ability for local oxidation. In addition to this, laser beam can be directed into some areas that other processes cannot reach. For these reasons, Nd:YAG pulsed laser working at 1064 nm wavelength is used for the oxidation purposes of Si and Ta films. First, SiO2 laye...
The role of pore structure in sound absorption performance of lime based plasters Meric Nursal, Işın; Tavukçuoğlu, Ayşe; Çalışkan, Mehmet (The Institute of Noise Control Engineering of the USA, Inc.; 2015-08-09) Sound absorption performance is directly related to the pore structure of materials. The effect of materials' pore characteristics on sound absorption performance has been examined in detail, especially for materials like mineral wool, foamed metals, porous concrete, sand and soils. However, there is scarcity of knowledge in literature on relationships between sound absorption characteristics of lime-based plasters used as finishing layer(s) in buildings and their pore structure. In this study sets of lime-...
3d modeling of on-chip acoustophoretic particle manipulation in a polymer microfluidic device Çaǧatay, E.; Özer, Mehmet Bülent; Çetin, B. (2016-01-01) This study focuses on understanding of the sensitivities of the acoustophoretic process on uncertainties/errors in the geometric properties of the chip material and the piezoelectric actuators. The sensitivity of the acoustophoretic process is investigated both numerically and experimentally. For the numerical simulations a three dimensional finite element model is used. In the experimental analysis, a microfluidic chip with two stations is used. The first station has the accurate geometric values of the de...

Citation Formats

F. C. Şahin, “An experimental study on off-design performance and noise in small pumps,” M.S. - Master of Science, Middle East Technical University, 2007.