Full-scale demonstration tests of cabin noise reduction using activevibration control

Simpson, Myles A.; Luong, T. M.; Fuller, Chris R.; Jones, James D.

doi:10.2514/6.1989-1074

Cited by 10 publications

(9 citation statements)

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“…To their surprise, global interior noise control is observed albeit only one actuator is used. They then extended the work to a full-scale aircraft for validation [Simpson et al, 1991]. Concurrently, another research group demonstrated analytically and experimentally at a higher level of detail in a rectangular enclosure; including optimizing the position of the actuator [Pan et al, 1990;Pan and Hansen, 1991;.…”

Section: Active Structural Acoustic Controlmentioning

confidence: 99%

Acoustic Metamaterials: A Potential for Cabin Noise Control in Automobiles and Armored Vehicles

Ang

Koh²,

Lee

2016

Int. J. Appl. Mechanics

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The aim of this paper is to provide an overview of the existing industrial practices used for cabin noise control in various industries such as automotive, marine, aerospace, and defense. However, emphasis is placed on automobiles and armored vehicles. Generally, automobile cabins usually constitute of thin structural panels, where the fundamental frequency typically falls below 200[Formula: see text]Hz. If a specific structural mode couples with a specific acoustic mode of the cabin, booming noise occurs. As such, discomfort may be felt by the occupants. Fundamentally, vibroacoustics problems may be minimized if the acoustic modes and the structural modes are decoupled, which is achieved usually by structural modifications or acoustical treatments. However, if excessively performed, the weight limitation of an automobile design will be exceeded; not to mention the adverse effect of increased weight on several factors such as fuel efficiency, mileage life of tires and acceleration of the vehicle. Moreover, current solutions have several drawbacks in low frequency noise control. In light of this, it is of great interest to explore the feasibility of acoustic metamaterials as an alternative with hope to improve cabin noise.

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Section: Active Structural Acoustic Controlmentioning

confidence: 99%

Acoustic Metamaterials: A Potential for Cabin Noise Control in Automobiles and Armored Vehicles

Ang

Koh²,

Lee

2016

Int. J. Appl. Mechanics

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“…6-a, the behavior of the panel of Table I is 7 shows the distribution of the maximum amplitude vibration field along the middle axis of the plate, computed by fixing y=l/2 in (3). One of the diagrams is referred to the effect due to the disturbance wave at frequency ν = 78 Hz and intensity 100 dB, computed from (3) and (5). For a voltage of 150 V (that is the highest limit for low-voltage actuators) PZT patches can generate vibration fields far lower than the one generated by the disturbance.…”

Section: Numerical Analyses Of the Level Of Controllability Of Glamentioning

confidence: 99%

“…In [22] the use of stack actuators was suggested for the control of active vibrations of stiff plates. In this chapter the performances of PZT patches and stack actuators are compared, as they gave good performances in previous experimental test [5], [6], [22]. Transparency of glazed panels can be preserved by positioning actuators along the edge and hidden by the frame if necessary for image purposes.…”

Section: A Choice Of Actuatorsmentioning

confidence: 99%

“…References [20] and [21] give a good review of the many kinds of actuators on the market. As already stated in Chapter I, some successfully tests were carried out, using PZT patches as actuators for active control of vibrations of airplane fuselages [5], [6]. In [22] the use of stack actuators was suggested for the control of active vibrations of stiff plates.…”

Section: A Choice Of Actuatorsmentioning

confidence: 99%

“…For this reason, when the cavities are narrow, it is convenient to apply both reference sensors and actuators on the same glazed panel, as required for the implementation of a feedback controller: automotive companies as well as plane manufacturers have paid great attention to this approach. In [5] control experiments are performed in a test section comprising the aft portion of a furnished DC-9 aircraft, demonstrating the potential of ASAC in reducing cabin noise in realistic aircraft structures. Using a typical feed-forward controller arrangement driving two shakers as control forces, the researchers achieved global sound level reductions of up to 9 dB.…”

Section: Introductionmentioning

confidence: 99%

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Integration of an Automated Active Control System in Building Glazed Facades for Improving Sound Transmission Loss

Naticchia¹,

Carbonari²

2005

Proceedings of the 22nd International Symposium on Automation and Robotics in Construction

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Abstract-In buildings, windows and glazed facades are often the weak link in protecting the interior from exterior noise. Since passive means for improving the Sound Transmission Loss (STL) of glazed facades are very expensive and are effective only at high frequencies, an active controller that increases the STL in the low frequency range is an attractive approach to reducing the noise level in buildings with glazed facades, guaranteeing the performance required by the 89/106/CEE European Directive, which made protection against noise a compulsory requirement for buildings. Several kinds of active control system of Sound Transmission were recently studied, whose two main applications are known as Active Noise Control (ANC) and Active Structural Acoustic Control (ASAC) systems. This paper concerns the second approach: it is based on the reduction of structural vibration, through the use of actuators bonded on the vibrating surfaces, driven by an automated control system, whose task is minimizing those vibrations, and consequently, radiated sound. A technological study aimed at choosing a suitable solution for the integration of such automated control systems in buildings with glazed facades is studied, and future research developments are planned.

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Experiments on active vibration and noise reduction of a panel using predictive techniques

Dozio

Ghiringhelli

2008

Struct. Control Health Monit.

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An experimental study of generalized predictive control of mechanically induced vibration and near-field sound radiation from a thin plate is described. The test panel is equipped with accelerometers and piezoelectric patches. The vibroacoustic reduction as a function of predictive controller design is discussed. The results demonstrate a large increase in regulation when the controller implicitly incorporates the disturbance model. Average 9 dB vibration and 5.5 dB noise reductions integrated over 0-1200 Hz were obtained for the case of random broadband disturbance. A satisfactory rejection was also achieved when the test panel was excited by the superposition of wide-band and narrow-band off-resonance disturbances. to 2.7 dB for the case of a feedback only GPC. Reductions of near-field sound radiation of 5.5 dB over 0-1200 Hz were obtained with a controller implicitly incorporating the disturbance model. Good vibration and noise rejection at off-resonances were also achieved when the test panel was excited by the superposition of broadband and narrow-band off-resonance disturbances. These results are encouraging for flight implementation, in particular for interior noise reduction inside helicopter cabin. Tests on a civil helicopter mockup are the subjects of ongoing research.

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Full-scale demonstration tests of cabin noise reduction using activevibration control

Cited by 10 publications

References 0 publications

Acoustic Metamaterials: A Potential for Cabin Noise Control in Automobiles and Armored Vehicles

Acoustic Metamaterials: A Potential for Cabin Noise Control in Automobiles and Armored Vehicles

Integration of an Automated Active Control System in Building Glazed Facades for Improving Sound Transmission Loss

Experiments on active vibration and noise reduction of a panel using predictive techniques

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