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Analysis of stationary displacement patterns in rotating machinery subject to local harmonic excitation
KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.ORCID-id: 0000-0003-0155-127X
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, MWL Marcus Wallenberg Laboratoriet.ORCID-id: 0000-0001-5760-3919
KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Maskin- och processteknologi.
2017 (engelsk)Inngår i: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568, Vol. 389, s. 224-235Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Rotor vibration and stationary displacement patterns observed in rotating machineries subject to local harmonic excitation are analysed for improved understanding and dynamic characterization. The analysis stresses the importance of coordinate transformation between rotating and stationary frame of reference for accurate results and estimation of dynamic properties. A generic method which can be used for various rotor applications such as machine tool spindle and turbo machinery vibration is presented. The phenomenon shares similarities with stationary waves in rotating disks though focuses on vibration in shafts. The paper further proposes a graphical tool, the displacement map, which can be used for selection of stable rotational speed for rotating machinery. The results are validated through simulation of dynamic response of a milling cutter, which is a typical example of a variable speed rotor operating under different load conditions.

sted, utgiver, år, opplag, sider
Elsevier, 2017. Vol. 389, s. 224-235
Emneord [en]
Rotor dynamics, Displacement map, Milling
HSV kategori
Forskningsprogram
Teknisk mekanik; SRA - Produktion
Identifikatorer
URN: urn:nbn:se:kth:diva-198179DOI: 10.1016/j.jsv.2016.11.017ISI: 000390623100014Scopus ID: 2-s2.0-85002535452OAI: oai:DiVA.org:kth-198179DiVA, id: diva2:1055948
Prosjekter
VINNOVA - FFI COMPIT
Forskningsfinansiär
Vinnova, G62250
Merknad

QC 20161214

Tilgjengelig fra: 2016-12-13 Laget: 2016-12-13 Sist oppdatert: 2019-09-18bibliografisk kontrollert
Inngår i avhandling
1. Estimation of Machining System Dynamic Properties - Measurement and Modelling
Åpne denne publikasjonen i ny fane eller vindu >>Estimation of Machining System Dynamic Properties - Measurement and Modelling
2017 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Dynamic characteristics of machining systems are analysed for improved understanding of both structural and process properties. The thesis stresses the use of testing methods under operational like conditions as these are more representative of closed loop systems, such as machining systems, as compared to conventional testing methods.

The test instrument proposed is a contactless excitation and response system, developed for testing of machine tool spindles under load and with rotating spindle. The instrument uses electromagnetic excitation and displacement sensors for analysis of rotating milling tools subject to load. A graphical tool for displaying and analysing rotor displacement was developed in conjunction with this.

A modelling procedure for both off-line and on-line estimation of dynamic properties of mechanical structure and process information is presented. The proposed auto-regressive moving average models enable calculation of operational dynamic parameters and they can be estimated in a recursive manner, thus enabling real-time monitoring. The discrimination between stable and unstable processes, both in turning and milling, was performed by analysing the damping obtained from the operational dynamic parameters.

sted, utgiver, år, opplag, sider
Stockholm: Kungliga Tekniska högskolan, 2017. s. 57
Serie
TRITA-IIP, ISSN 1650-1888 ; 17-02
Emneord
Machining system, Operational dynamic parameters, Displacement map, Contactless excitation and response system
HSV kategori
Forskningsprogram
SRA - Produktion; Industriell produktion
Identifikatorer
urn:nbn:se:kth:diva-204579 (URN)978-91-7729-323-1 (ISBN)
Disputas
2017-04-28, F3, Lindstedtsvägen 26, Stockholm, 10:00 (engelsk)
Opponent
Veileder
Forskningsfinansiär
VINNOVA
Merknad

QC 20170330

Tilgjengelig fra: 2017-03-30 Laget: 2017-03-28 Sist oppdatert: 2017-03-30bibliografisk kontrollert

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