Rotor noise control using 3D-printed porous materials

2017 ◽  
Vol 142 (4) ◽  
pp. 2507-2507 ◽  
Author(s):  
Con Doolan ◽  
Chaoyang Jiang ◽  
Danielle Moreau ◽  
Yendrew Yauwenas
Keyword(s):  
Porous Materials ◽  
Noise Control ◽  
Rotor Noise ◽  
3D Printed

Optimization of 3D printed porous materials accounting for manufacturing defects

2021 ◽  
Vol 263 (3) ◽  
pp. 3143-3148
Author(s):  
Jean Boulvert ◽  
Théo Cavalieri ◽  
Vicente Romero-García ◽  
Gwénaël Gabard ◽  
Jean-Philippe Groby
Keyword(s):  
Additive Manufacturing ◽  
Porous Materials ◽  
Numerical Models ◽  
Manufacturing Processes ◽  
Perfect Absorption ◽  
Manufacturing Defects ◽  
Low Weight ◽  
Minimization Algorithms ◽  
3D Printed ◽  
Experimental Validations

Open-cell materials are well-known for their low price, low weight, and broadband acoustic behavior. They form one of the most used class of acoustic treatments but suffer from a lack of versatility when made by conventional manufacturing processes. Recent advances in additive manufacturing allow to produce porous materials having a controlled microstructure. In this way, the design of treatments including porous materials is not limited to a catalog of existing media. The macroscopic behavior is governed by the micro-geometry of the porous medium, which can be estimated by numerical models. Then, acoustic treatments can be optimized numerically using predicting models and minimization algorithms. However, additive manufacturing induces defects often too complex to be accounted for numerically. In this presentation, a method allowing to obtain the parametric model of the intrinsic behavior of a 3D-printed porous material is presented. The corrected model is used in the optimization of several porous treatments; namely, graded porous materials, folded porous materials and metaporous surfaces. These treatments are versatile and display remarkable properties. They provide quasi-perfect absorption at several frequencies that can be out of reach of standard porous treatments in normal or oblique incidence. Experimental validations confirm the relevance of the proposed design processes.

An Origami-Based Tunable Helmholtz Resonator for Noise Control: Introduction of the Concept and Preliminary Results

2017 ◽  
Author(s):  
Amine Benouhiba ◽  
Kanty Rabenorosoa ◽  
Morvan Ouisse ◽  
Nicolas Andreff
Keyword(s):  
Noise Control ◽  
Experimental Testing ◽  
Helmholtz Resonator ◽  
Experimental Tests ◽  
Acoustic Control ◽  
Wide Range ◽  
Foldable Structures ◽  
3D Printed ◽  
Passive Acoustic ◽  
Acoustic Domain

A Helmholtz resonator is a passive acoustic device that enables noise reduction at a given frequency. This frequency is directly related to the volume of the resonator and to the size of the neck that couples the resonator to the acoustic domain. In other words, controlling the volume of the cavity allows a real time tunability of the device, which means noise control at any desired frequency. To that end, we propose an Origami-based tunable Helmholtz resonator. The design is inspired from the well-known origami base, waterbomb. Such foldable structures offer a wide range of volume shifting which corresponds to a frequency shifting in the application of interest. The foldability of the structure is first investigated. Then, a series of numerical simulations and experimental tests were preformed are presented, in order to explore the capabilities of this origami structures in acoustic control. A shift in the frequency domain of up to 197 Hz (131–328 Hz) was achieved in an experimental testing using 3D printed rigid devices.

scholarly journals Identification of the Thermal Constants of the DPL Heat Transfer Model of a Single Layer Porous Material

2021 ◽  
Vol 25 (2) ◽  
pp. 41-46
Author(s):  
Maria Strąkowska ◽  
Gilbert De Mey ◽  
Bogusław Więcek
Keyword(s):  
Heat Transfer ◽  
Porous Materials ◽  
Single Layer ◽  
Optimization Methods ◽  
Parameters Estimation ◽  
Transfer Model ◽  
Phase Lag ◽  
Thermal Constants ◽  
The Laplace Transform ◽  
3D Printed

This paper deals with parameters’ identification of the Dual Phase Lag (DPL) thermal model of a 3D printed porous materials. The experiments were performed for two porous materials with different filling factors. The Laplace transform was applied for the heat transfer equation and together with different optimization methods it allowed to identify the thermal time constants of the DPL model. Several optimization methods were tested with known parameters in order to confirm the correctness of the parameters’ estimation.

Parallel Blade-Vortex Interaction Modelling for Helicopter Rotor Noise Control Synthesis

2014 ◽  
Vol 13 (7-8) ◽  
pp. 587-606 ◽  
Author(s):  
Sara Modini ◽  
Giorgio Graziani ◽  
Giovanni Bernardini ◽  
Massimo Gennaretti
Keyword(s):  
Noise Control ◽  
Helicopter Rotor ◽  
Control Synthesis ◽  
Vortex Interaction ◽  
Rotor Noise ◽  
Blade Vortex Interaction ◽  
Interaction Modelling

Helicopter Rotor Noise Control

1975 ◽  
Vol 4 (3) ◽  
pp. 102
Author(s):  
Harry Sternfeld, Jr.
Keyword(s):  
Noise Control ◽  
Helicopter Rotor ◽  
Rotor Noise

Application of Actuator Line Model for Large Eddy Simulation of Rotor Noise Control

2021 ◽  
Vol 108 ◽  
pp. 106405
Author(s):  
Yann Delorme ◽  
Ronith Stanly ◽  
Steven H. Frankel ◽  
David Greenblatt
Keyword(s):  
Large Eddy Simulation ◽  
Noise Control ◽  
Line Model ◽  
Eddy Simulation ◽  
Rotor Noise ◽  
Large Eddy ◽  
Actuator Line Model

scholarly journals Design, Experimental and Numerical Characterization of 3D-Printed Porous Absorbers

Materials ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3397 ◽  
Author(s):  
Tobias P. Ring ◽  
Sabine C. Langer
Keyword(s):  
Porous Materials ◽  
Optimization Procedure ◽  
Geometric Design ◽  
Room Acoustics ◽  
Noise Mitigation ◽  
Design And Optimization ◽  
Numerical Characterization ◽  
Design Variables ◽  
3D Printed ◽  
Set Up

The application of porous materials is a common measure for noise mitigation and in room acoustics. The prediction of the acoustic behavior applies material models, among which most are based on the Biot-parameters. Thereby, it is expected that, if more Biot-parameters are used, a better prediction can be obtained. Nevertheless, an estimation of the Biot-parameters from the geometric design of the material is possible for simple structures only. For common porous materials, the microstructure is typically unknown and characterized by homogenized quantities. This contribution introduces a methodology that enables the design and optimization of porous materials based on the Biot-parameters and connects these to microscopic geometric quantities. Therefore, artificial porous materials were manufactured using 3D-printing technology with a prescribed geometric design and the influence of different design variables was investigated. The Biot-parameters were identified with an inverse procedure and it can be shown that different Biot-parameters can be influenced by adjusting the geometric design variables. Based on these findings, a one-parameter optimization procedure of the material is set up to maximize the absorption characteristics in the frequency range of interest.

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