Closed-loop control of flow-induced sound in a flow duct with downstream resonant cavities
نویسندگان
چکیده
منابع مشابه
Closed-loop control of flow-induced sound in a flow duct with downstream resonant cavities.
A closed-loop-controlled surface perturbation technique was developed for controlling the flow-induced sound in a flow duct and acoustic resonance inside downstream cavities. The surface perturbation was created by piezo-ceramic THUNDER (THin layer composite UNimorph Driver and sEnsoR) actuators embedded underneath the surface of a test model with a semi-circular leading edge. A modified closed...
متن کاملClosed-loop fluid flow control using a low dimensional model
With constantly increasing environmental constraints, the need for ever more efficient aeronautical systems has driven fundamental research in many areas including mechanical engineering, fluid mechanics, materials, . . . In particular, the active control of open flows has long been identified as a potential key factor to reduce the drag, enhance manoeuvrability, noise attenuation, etc. In this...
متن کاملSound Propagation in Slowly Varying 2D Duct with Shear Flow
Sound propagation in uniformly lined straight ducts with uniform mean flow is well established by its analytically exact description in duct modes [1, 2, 3]. In cross-wise nonuniform flow there are still modes, although the (Pridmore-Brown) equation that describes them is in general not solvable in terms of standard functions [4, 5, 6, 7, 8, 9] and has to be solved numerically. These modal solu...
متن کاملAn Experimental Study of the Cavity Flow for Closed-Loop Flow Control
We present the results of an experimental investigation conducted as part of a multidisciplinary effort intended to address systematically the problem of closed-loop flow control by assembling expertise from numerical and experimental flow analysis, flow modeling, and control design disciplines. Experiments were conducted using a shallow-cavity flow in a small-scale wind tunnel that can operate...
متن کاملA Double Closed-Loop Control Method for Quasi-Resonant Converter
To achieve the soft-switching condition and stabilize the output voltage of quasi-resonant converters, the paper proposes a double closed-loop control method (DCCM). In the inner loop, soft-switching is guaranteed with the off-time of the switch determined by the zero-crossing signal of the switching voltage. In the outer loop, the output voltage is regulated to be constant against load variati...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Journal of the Acoustical Society of America
سال: 2013
ISSN: 0001-4966
DOI: 10.1121/1.4789898