Dynamic characterization of noise and vibration transmission paths in linear cyclic systems (II) - Experimental validation

Authors
Citation
Hj. Kim et Ym. Cho, Dynamic characterization of noise and vibration transmission paths in linear cyclic systems (II) - Experimental validation, KSME INT J, 14(10), 2000, pp. 1061-1071
Citations number
18
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Mechanical Engineering
Journal title
KSME INTERNATIONAL JOURNAL
ISSN journal
1226-4865 → ACNP
Volume
14
Issue
10
Year of publication
2000
Pages
1061 - 1071
Database
ISI
SICI code
1226-4865(200010)14:10<1061:DCONAV>2.0.ZU;2-B
Abstract
Linear cyclic systems (LCS's) are a class of systems whose dynamic behavior changes periodically. Such a cyclic behavior is ubiquitous in systems with fundamentally repetitive motion. Yet, the knowledge of the noise and vibra tion transmission paths in LCS's is quite limited due to the time-varying n ature of their dynamics. The first part of this two-part paper derives a ge neric expression that describes how the noise and/or vibration are transmit ted between two (or multiple) points in the LCS's. In Part II, experimental validation of the theoretical development of Part I is provided. The noise and vibration transmission paths of the scroll and rotary compressors (two typical LCS's) are examined to show that the LCS's indeed generate a serie s of amplitude modulated input signals at the output, where the carrier fre quencies are harmonic multiples of the LCS' fundamental frequency. The crit erion proposed in Part I to determine how well a given LCS can be approxima ted as a linear time-invariant systems (LTIS) is applied to the noise and v ibration transmission paths of the two compressors. Furthermore, the implic ations of the experimental validations/applications are discussed in order to assess the applicability of the noise/vibration source and transmission path identification techniques based on the assumption that the system unde r consideration is linear and time-invariant.