Active control of road noise inside vehicles

Sutton, T.J.; Elliott, Stephen J.; McDonald, Amy; Saunders, Timothy J.

doi:10.3397/1.2828351

Cited by 122 publications

(64 citation statements)

References 9 publications

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“…In the automotive industry, ANC is also reported in numerous works. The feedforward control system is demonstrated on the front seats of a commercial car by Sutton et al [1994]. Despite the effectiveness of the control system below 200 Hz, they highlighted that it is not sufficiently robust and reliable as instability occurs even with a slightest delay of milliseconds.…”

Section: Active Noise Controlmentioning

confidence: 99%

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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 Noise Controlmentioning

confidence: 99%

“…Interested readers can refer to the literature for further perusal [Muller and Moser, 2013]. There are two kinds of controller -namely feedback and feedforward [Sutton et al, 1994;Tichy, 1991]. The former is a very simple control system, where it involves secondary sources and error sensors as described above.…”

Section: Active Noise 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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“…For example, in the aircraft environment the low frequency tonal noise induced by the propellers has been successfully controlled using a feedforward active noise control system, and a broadband attenuation in the sound pressure level of 7 dBA has been reported [6]. In the automotive environment a variety of active control systems have been proposed for both engine [7,8] and road noise control [9,10]. More broadly, active control technology has been applied to fan noise [11], active earmuffs [12], noise transmission through windows [13] and sound radiation from a helicopter transmission [14].…”

Section: Introductionmentioning

confidence: 99%

Active noise control of a diesel generator in a luxury yacht

Cheer

Elliott

2016

Applied Acoustics

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Active noise control has been applied to a variety of systems in order to improve performance without the increases in size and weight that would otherwise be required by traditional passive noise control treatments. This paper investigates the application of an active noise control system to the control of generator noise in the master cabin of a luxury yacht. A multichannel, multi-tonal active noise control system employing loudspeakers and microphones in the master cabin of the yacht is investigated. It is shown that, due to the high number of engine orders produced by the generator, in order to achieve significantly perceptible levels of noise attenuation it is necessary to control at least 7 individual orders. A controller is investigated which targets 19 engine orders and it is shown to achieve in excess of 5 dB broadband attenuation, whilst achieving up to 23 dB attenuation in individual orders. This corresponds to a 23% reduction in the Zwicker loudness.

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“…6,7,8,9,10 Reducing the weight of vehicles also increases the low frequency noise produced in the car cabin due to road-tyre interactions. Road noise has also been controlled using a feedforward control system, 11 however, due to the random nature of road noise and the complex propagation path between structural excitation of the tyre and the acoustic noise produced in the car cabin, the implementation of a feedforward controller is significantly more demanding. Reference signals for a feedforward road noise control system have been obtained from accelerometers mounted to the vehicle's suspension and bodywork, 11 however, in order to obtain sufficient coherence between the reference and disturbance signals it is necessary to employ at least six accelerometers.…”

Section: Introductionmentioning

confidence: 99%

“…Reference signals for a feedforward road noise control system have been obtained from accelerometers mounted to the vehicle's suspension and bodywork, 11 however, in order to obtain sufficient coherence between the reference and disturbance signals it is necessary to employ at least six accelerometers. 11,12 Although a feedforward control system has been reported to achieve reductions of up to 7 dBA at the driver's ear position between 100 and 200 Hz, 11 the need for multiple reference accelerometers means that the system is relatively expensive to implement and, therefore, has seen limited commercial implementation.…”

Section: Introductionmentioning

confidence: 99%

The Design and Performance of Feedback Controllers for the Attenuation of Road Noise in Vehicles

Cheer¹,

Elliott²

2014

IJAV

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Active noise control systems offer a potential method of reducing the weight of acoustic treatments in vehicles and, therefore, of increasing fuel efficiency. The commercialisation of active noise control has not been widespread, however, partly due to the cost of implementation. This paper investigates the design and performance of feedback road noise control systems, which could be implemented cost-effectively by using the car audio loudspeakers as control sources and low-cost microphones as error sensors. Three feedback control systems are investigated, of increasing complexity: a single-input single-output (SISO) controller; a SISO controller employing weighted arrays of error sensors and control sources; and a fully-coupled multi-input multi-output (MIMO) controller. For each of the three controllers robustness and disturbance enhancement constraints are defined and by formulating the three controllers using an Internal Model Control (IMC) architecture, and using frequency discretisation, the constrained optimisation problems are solvable using sequential quadratic programming. The performance of the three controllers and the associated design methods are first evaluated in a simulated environment, which allows the physical limits on performance to be understood. Finally, to validate the results in the simulated environment, the performance of the three controllers has been calculated using data measured in a car cabin and it has been shown that the fully-coupled MIMO controller is able to achieve significant low frequency road noise control, at the expense of increased implementation complexity compared to the SISO and SISO weighted transducer arrays feedback controllers.

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Active control of road noise inside vehicles

Cited by 122 publications

References 9 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

Active noise control of a diesel generator in a luxury yacht

The Design and Performance of Feedback Controllers for the Attenuation of Road Noise in Vehicles

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