Full-scale experiments on the reduction of propeller-induced aircraft interior noise with active trim panels

Misol, Malte

doi:10.1016/j.apacoust.2019.107086

Cited by 17 publications

(10 citation statements)

References 16 publications

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“…On-ground tests using near-field acoustic sources to replicate the dynamic pressure field acting on the fuselage surface of aircraft during a flight have been researched in the past [2,3] as well as in recent years [4,5] given the revived interest in fuel efficient, but usually noisy, turboprops. 1226 (2022) 012053 IOP Publishing doi:10.1088/1757-899X/1226/1/012053 2 Current systems, however, still rely on manual inputs for each loudspeaker and frequency band, can replicate only either the random or the harmonic excitations, or their acoustic load covers only a portion of the full circumference of the fuselage [6].…”

Section: Introductionmentioning

confidence: 99%

Development of an innovative noise generation system for turboprop aircraft fuselage testing

Borgo

Álvarez

Blanco

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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This paper presents the development of a cabin noise testing equipment that will be used to evaluate the interior noise of regional aircraft as well as to aid the development of noise reduction techniques. The innovative noise generation system consists of three loudspeaker arrays positioned around the fuselage circumference to synthesize a pressure field that is similar to the pressure field seen by the fuselage during a flight. The acoustic pressure field generated by the loudspeakers is measured by a number of microphones scattered on the fuselage surface. These microphone signals are then fed back to the controller with the purpose of minimising the error between the target pressure field and the measured one by means of an iterative learning approach. The number and location of the microphones used in the control loop are selected through a pre-test optimisation analysis, which aims to reduce the time and cost of the set-up. A small-scale electroacoustic demonstrator has been built to develop the feedback control approach. A frequency domain multi-input multi-output feedback controller is used to replicate the random pressure field generated by the turbulent boundary layer excitation. The multi-harmonics of the propeller induced excitation are then added to the time histories of the broadband noise using a time waveform replication technique. Different arrangements of the driving signal distribution are investigated, and the results are then presented in terms of accuracy of the pressure field reproduction.

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Section: Introductionmentioning

confidence: 99%

Development of an innovative noise generation system for turboprop aircraft fuselage testing

Borgo

Álvarez

Blanco

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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“…The barrier must be too thick (and in many cases also too heavy) for practical usage. Such limitations have influenced interest in active systems, which may be very effective for low frequencies and complement passive methods in their weak points [ 3 , 4 , 5 ]. A number of single-panel solutions have been developed in recent years [ 6 , 7 , 8 ], where vibrations of a thin barrier were controlled by actuators in order to reduce noise transmission and radiation.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Active Structural Acoustic Control Applied to a Washing Machine

Wrona

2022

Sensors

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Great efforts are undertaken by scientists and manufacturers to reduce noise generated by devices present in the human environment. This task is particularly difficult in the case of low-frequency noise; however, active noise reduction methods can be a solution to such problems. The purpose of this article is to present the active noise-controlling casing method applied to a washing machine, whose noise generated during the spinning process is to be reduced. The paper presents a set of experimental measurements and analyses. It also provides hardware and software configuration details. The employed active control system can efficiently reduce noise, even by 16 dBA in the low-frequency range up to 300 Hz, which is an important step towards making the technology ready for manufacturing. The conclusions drawn are valid for different active noise-control applications, considering a variety of devices.

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“…[1][2][3][4][5][6][7][8][9] The main advantage of the use of IAs is that there is no requirement of any other structure to react off. 1,2,5 At frequencies above the natural frequency of the IA, it can effectively generate a constant actuation force and in-phase with the input driving voltage. 9 Consequently, when an accelerometer with integrated output is collocated at primary structure, the IA can be used to perform velocity feedback control, which reduces the structure vibration by means of active damping.…”

Section: Introductionmentioning

confidence: 99%

Inertial Actuator with Virtual Mass for Active Vibration Control

Mao¹,

Li²,

Huang³

2020

The International Journal of Acoustics and Vibration

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Inertial actuators (IAs) are often used as control units in active noise and vibration control systems. It is well-known that the IA's natural frequency should be far below that of the structure under control to ensure good stability margins. However, under normal circumstances, an IA with low natural frequency either increases the additional weight or causes unwanted static displacement of the IA's proof-mass. In this study, an IA with virtual mass is presented to reduce the IA's natural frequency without changing its physical design. The virtual mass of the IA is realized by using the proof-mass acceleration feedback as a local loop within the IA. Thus, the IA's natural frequency can be shifted to low frequency for active control application. The proposed IA with virtual mass is then applied to actively control a clamped beam's vibration based on the velocity feedback control system. The experimental results show that the stability of the control system and the control performance can be improved significantly as the IA's natural frequency is reduced with virtual mass.

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Full-scale experiments on the reduction of propeller-induced aircraft interior noise with active trim panels

Cited by 17 publications

References 16 publications

Development of an innovative noise generation system for turboprop aircraft fuselage testing

Development of an innovative noise generation system for turboprop aircraft fuselage testing

Performance Analysis of Active Structural Acoustic Control Applied to a Washing Machine

Inertial Actuator with Virtual Mass for Active Vibration Control

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