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Research Areas

Environmental Noise

Traffic noise is of major concern due to its adverse impact to a huge population in Hong Kong, a highly urbanized city. Tyre/road noise is one of main sources of traffic noise. 

Close-Proximity (CPX) Method, a standard tyre/road noise measurement method, was adopted to explore the influence of road surface material on the noise by the Hong Kong Polytechnic University since 2006. 

An enclosure was applied to isolate the target, tyre/road noise, and the unwanted background for ensuring the measurement quality. The design for an advanced enclosure is carrying out.

 

Related Projects

  1. Development of Advanced Close-Proximity (CPX) Technology with Suppressed Background Noise for Tyre/Road Noise Measurement in Hong Kong Traffic

  2. A Study of Sideway Noise Emission Due to Tyre/Road Interaction

  3. Passive Control of Train-Tunnel Interaction Aeroacoustics in High-Speed Railway

  4. New Acoustic Source Localization Methodology in Realistic Reverberant Sound Fields Using Optimal Broadband Beamformer Design

  5. Simulation of Realistic Acoustic Environment for Optimal Beamformer Design for Hands-Free Communication Products

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environmental

Computational Aeroacoustics

An in-house numerical solver has been developed to study the complex interactions between unsteady flow, panel structural vibration and acoustics. Direct Aeroacoustic Simulation (DAS) approach is utilized for its capability of resolving the inherent coupling between the unsteady airfoil aerodynamic and acoustic solutions with sufficient accuracy. To solve the unsteady N-S equations, conservation element and solution element (CE/SE) method is adopted. It is a robust and highly accurate method which enforces strict physical conservation laws in N-S equations in both space and time domains 

Related Projects:

  1. Aeroacoustic Resonance of In-Duct Cascade

  2. Aeroacoustics Modeling of Pressure Pulsations Generated at Duct Discontinuities

  3. Aeroacoustics of High-lift Airfoil with Trapped Vortex Cavity

  4. Numerical Modeling of Aeroacoustic Generation by Flow Duct Side-Branches at Various Separations

  5. Engineering Aeroacoustics

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CAA

Aeroacoustic-Structural Interaction

Accurate prediction of the acoustics of fluid-structure interaction is important in devising quieting designs for engineering systems, e.g. that equipped with extensive flow duct networks where the thin duct wall panels are in contact with the flowing fluid. 

The flow unsteadiness generates acoustic waves that propagate back to the source region to modify the flow process generating them. Meanwhile, the unsteady flow pressure excites the thin panels to vibrate, which in turn modifies the flow processes.

The intrinsic nonlinear aeroacoustic-structural interaction is resolved by a time-domain numerical methodology with in-house code which has excellent agreement with experimental data.

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Related Projects:

  1. Experimental and Numerical Studies of Innovative Acoustical Material Technology for Industrial and Urban Low-Frequency Noise Mitigation

  2. A Study of the Effects of Aeroacoustic-Structural Interaction on Airfoil Trailing Edge Noise

  3. Computational Science and Engineering for Product Innovation and Aeronautical System Design

  4. Nonlinear Aeroacoustic-Structure Interaction of Finite Periodically Stiffened Flexible Panels Loaded with Unsteady Flow

  5. Nonlinear Fluid-Structure Interaction of an Elastic Lifting Surface Undergoing Dynamic Stall and Its Control

  6. Exploration of Tunable Fluid-structure Interaction for Development Advanced Aeronautical Noise Mitigation Technology

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ASI

CAESI Team  COMPUTATIONAL AEROACOUSTIC-STRUCTURAL INTERACTION TEAM

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