南方科技大学知识苑(SUSTech KC): System identification of a low-density jet via its noise-induced dynamics

题名	System identification of a low-density jet via its noise-induced dynamics
作者	Lee, Minwoo 1; Zhu, Yuanhang 1,2; Li, Larry K. B.1; Gupta, Vikrant3
通讯作者	Li, Larry K. B.; Gupta, Vikrant
发表日期	2019-01-08
DOI	10.1017/jfm.2018.961
发表期刊	JOURNAL OF FLUID MECHANICS 影响因子和分区
ISSN	0022-1120
EISSN	1469-7645
卷号	862页码:200-215
摘要	Low-density jets are central to many natural and industrial processes. Under certain conditions, they can develop global oscillations at a limit cycle, behaving as a prototypical example of a self-excited hydrodynamic oscillator. In this study, we perform system identification of a low-density jet using measurements of its noise-induced dynamics in the unconditionally stable regime, prior to both the Hopf and saddle-node points. We show that this approach can enable prediction of (i) the order of nonlinearity, (ii) the locations and types of the bifurcation points (and hence the stability boundaries) and (iii) the resulting limit-cycle oscillations. The only assumption made about the system is that it obeys a Stuart-Landau equation in the vicinity of the Hopf point, thus making the method applicable to a variety of hydrodynamic systems. This study constitutes the first experimental demonstration of system identification using the noise-induced dynamics in only the unconditionally stable regime, i.e. away from the regimes where limit-cycle oscillations may occur. This opens up new possibilities for the prediction and analysis of the stability and nonlinear behaviour of hydrodynamic systems.
关键词	bifurcation low-dimensional models
相关链接	[来源记录]
收录类别	SCI ; EI
语种	英语
学校署名	通讯
资助项目	Shenzhen Science and Technology Program[JCYJ20170412151759222]
WOS研究方向	Mechanics ; Physics
WOS类目	Mechanics ; Physics, Fluids & Plasmas
WOS记录号	WOS:000455130100001
出版者	CAMBRIDGE UNIV PRESS
EI入藏号	20190206363828
EI主题词	Bifurcation (mathematics) ; Hydrodynamics
EI分类号	Public Buildings:402.2
ESI学科分类	ENGINEERING
来源库	Web of Science
引用统计	被引频次[WOS]：39
成果类型	期刊论文
条目标识符	http://sustech.caswiz.com/handle/2SGJ60CL/26614
专题	工学院_力学与航空航天工程系
作者单位	1.Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Clear Water Bay, Hong Kong, Peoples R China 2.Brown Univ, Sch Engn, Providence, RI 02912 USA 3.Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Shenzhen 518055, Peoples R China
通讯作者单位	力学与航空航天工程系
推荐引用方式 GB/T 7714	Lee, Minwoo,Zhu, Yuanhang,Li, Larry K. B.,et al. System identification of a low-density jet via its noise-induced dynamics[J]. JOURNAL OF FLUID MECHANICS,2019,862:200-215.
APA	Lee, Minwoo,Zhu, Yuanhang,Li, Larry K. B.,&Gupta, Vikrant.(2019).System identification of a low-density jet via its noise-induced dynamics.JOURNAL OF FLUID MECHANICS,862,200-215.
MLA	Lee, Minwoo,et al."System identification of a low-density jet via its noise-induced dynamics".JOURNAL OF FLUID MECHANICS 862(2019):200-215.