Experiments on Active Control of Counter-Rotating Open Rotor Interior Noise

Haase, Thomas; Algermissen, Stephan; Unruh, Oliver; Misol, Malte

doi:10.3813/aaa.918725

Cited by 7 publications

(10 citation statements)

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“…Nevertheless, the number of states is far more than needed, so for a more efficient integration, the number of states can be further reduced. In comparison with the investigations presented by the researchers in [16], the secondary path response in the frequency range of 100 Hz to 500 Hz is more flat than the response of the fuselage panel. This is due to the increased damping of a real aircraft fuselage induced by rivets and additional materials.…”

Section: System Identificationmentioning

confidence: 52%

“…For reasons of brevity, the description of the sound field synthesis is not given here. Detailed information about the sound field synthesis can be found in [16] and [17]. The addressed CROR BPFs are presented in Table 1.…”

Section: Testbed Dornier 728mentioning

confidence: 99%

“…The nearly collocated system is a quadratic (i.e., equal number of sensors and actuators) system that has a much greater potential to reduce the local error signals than a rectangular system (i.e., more sensors than actuators) [22]. Compared with previous measurements presented in [16] the number of sensors and actuators per more flat than the response of the fuselage panel. This is due to the increased damping of a real aircraft fuselage induced by rivets and additional materials.…”

Section: Feedforward Control Of the Test Sectionmentioning

confidence: 99%

“…The nearly collocated system is a quadratic (i.e., equal number of sensors and actuators) system that has a much greater potential to reduce the local error signals than a rectangular system (i.e., more sensors than actuators) [22]. Compared with previous measurements presented in [16] the number of sensors and actuators per square meter are reduced in this investigation and therefore, only the first five CROR frequencies are addressed with the control systems. The local vibration attenuation at the accelerometers of the two control systems is presented in Figure 10a.…”

Section: Feedforward Control Of the Test Sectionmentioning

confidence: 99%

“…Some previous work of Grewal et al shows promising results for an active control system reducing multisinusoidal excitations [15]. The authors also published a preliminary study on a stiffened carbon fibre reinforced plastic (CFRP) panel mounted in a transmission loss facility which shows promising results, too [16]. Reviewing the literature reveals that less work has been done on the development of AVC systems for a real aircraft with an airframe, windows and joints that is excited by a synthesised CROR sound pressure field.…”

Section: Introductionmentioning

confidence: 97%

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Active control of counter-rotating open rotor interior noise in a Dornier 728 experimental aircraft

Haase

Unruh

Algermissen

et al. 2016

Journal of Sound and Vibration

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The fuel consumption of future civil aircraft needs to be reduced because of the CO 2 restrictions declared by the European Union. A consequent lightweight design and a new engine concept called counter-rotating open rotor (CROR) are seen as key technologies in the attempt to reach this ambitious goals. Bearing in mind that CROR engines emit very high sound pressures at low frequencies and that lightweight structures have a poor transmission loss in the lower frequency range, these key technologies raise new questions in regard to acoustic passenger comfort. One of the promising solutions for the reduction of sound pressure levels inside the aircraft cabin are active sound and vibration systems. So far, active concepts have rarely been investigated for a CROR pressure excitation on complex airframe structures. Hence, the preliminary study presented in this paper shows how an active control system can influence the sound radiation of a complex airframe structure under a CROR pressure excitation and also addresses the open questions on the way towards its realisation. In this phase, an active feedforward control system is investigated in a fully equipped Dornier 728 experimental prototype aircraft. In particular, the sound transmission through

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Section: System Identificationmentioning

confidence: 52%

Section: Testbed Dornier 728mentioning

confidence: 99%

Section: Feedforward Control Of the Test Sectionmentioning

confidence: 99%

“…The nearly collocated system is a quadratic (i.e., equal number of sensors and actuators) system that has a much greater potential to reduce the local error signals than a rectangular system (i.e., more sensors than actuators) [22]. Compared with previous measurements presented in [16] the number of sensors and actuators per square meter are reduced in this investigation and therefore, only the first five CROR frequencies are addressed with the control systems. The local vibration attenuation at the accelerometers of the two control systems is presented in Figure 10a.…”

Section: Feedforward Control Of the Test Sectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

See 3 more Smart Citations

Active control of counter-rotating open rotor interior noise in a Dornier 728 experimental aircraft

Haase

Unruh

Algermissen

et al. 2016

Journal of Sound and Vibration

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show abstract

Aircraft and Airport Transportation Noise Sources and Control

2020

Engineering Acoustics

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On the stability of decentralized AVC/ASAC for large-scale structures

Algermissen

Monner

2017

Journal of Intelligent Material Systems and Structures

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Promising results have been achieved in controlling vibration and noise emission/transmission of single panel structures using active vibration control (AVC) and active structural acoustic control (ASAC). In most cases the contributed work has focused on a single panel or a section of the fuselage/lining. However, an AVC/ASAC system can only be effective when it is expanded to the entire fuselage structure. This expansion inevitably leads to a large number of sensors and actuators. For model-based control approaches especially, the system identification and the proof-of-stability would be challenging and probably not realizable. In this article a strategy for such large-scale problems is investigated. A decentralized control approach with collocated actuator–sensor pairs is proposed. Since adjacent control loops are highly coupled by the underlying structure, special attention has to be given to the global stability of the entire control system. Instead of proving local stability and setting a global master gain, a method for the tuning of the single collocated control loops is developed that takes the cross-couplings into account. Based on data of DLR’s experimental aircraft Dornier 728, it can be shown that the new method increases the performance of the control system compared to the master-gain method.

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Experiments on Active Control of Counter-Rotating Open Rotor Interior Noise

Cited by 7 publications

References 0 publications

Active control of counter-rotating open rotor interior noise in a Dornier 728 experimental aircraft

Active control of counter-rotating open rotor interior noise in a Dornier 728 experimental aircraft

Aircraft and Airport Transportation Noise Sources and Control

On the stability of decentralized AVC/ASAC for large-scale structures

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