Robust Feedback Control of a Baffled Plate via Open-Loop Optimization

Man, P. De; François, A.; Preumont, André

doi:10.1115/1.1421610

Cited by 5 publications

(3 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[112], showed that, for the case of broadband flexural vibration control of thin structures with collocated and dual sensor-actuator pairs, multichannel decentralized feedback systems perform as well as distributed and centralized control systems. In decentralized feedback control systems, the control functions for each control loop can be designed using the classic feedback control theory, which is based on frequency domain analysis and synthesis [25,46,47,[113][114][115][116]. In general, it can be demonstrated that, when the array of decentralized feedback loops is made with collocated and dual sensor-actuator pairs [117][118][119], the feedback loops are bound to be unconditionally stable [120,121], even for large variations of the response of the hosting structure or failure of single control units.…”

Section: Feed-forward and Feedback Control Architecturesmentioning

confidence: 99%

Comparison of smart panels for tonal and broadband vibration and sound transmission active control

Gardonio

Turco

2020

International Journal of Smart and Nano Materials

View full text Add to dashboard Cite

Section: Feed-forward and Feedback Control Architecturesmentioning

confidence: 99%

Comparison of smart panels for tonal and broadband vibration and sound transmission active control

Gardonio

Turco

2020

International Journal of Smart and Nano Materials

View full text Add to dashboard Cite

“…16 However, several problems have been encountered in the development of truly collocated and dual 8,9 distributed sensor-actuator pairs which would guarantee unconditionally stable feedback control loops. 7,[17][18][19][20][21][22][23][24] In contrast the modern approach uses much simpler arrays of sensors and actuators but rather complicated control systems with a state observer that inherently limits the control effectiveness as well as the robustness of the controller. 3,20,24 -37 In summary the development of SISO classic feedback control systems is held back by the difficulties encountered to develop collocated and dual distributed sensor-actuator pairs whose response functions have real part positive definite so that unconditionally stable direct feedback loops could be implemented.…”

Section: Introductionmentioning

confidence: 96%

Smart panels with velocity feedback control systems using triangularly shaped strain actuators

Gardonio

Elliott²

2005

The Journal of the Acoustical Society of America

View full text Add to dashboard Cite

In this paper we present a theoretical study on the active structural acoustic control of a new smart panel with sixteen triangularly shaped piezoelectric patch actuators, having their base edges evenly distributed along the perimeter of the panel, and velocity sensors positioned at the vertices opposite the base edges. The performance is assessed and contrasted with that of a conventional smart panel using a 4 x 4 array of square piezoelectric patch actuators evenly distributed over the surface of the panel with velocity sensors at their centers. For both systems the control effectiveness and stability of MIMO decentralized or SISO direct velocity feedback control architectures have been analyzed. The two control systems are arranged to generate active damping which reduces the response and sound radiation of the panel in the lightly damped and well separated low-frequency resonances. In particular the new control system can be seen as a set of sixteen "active wedges" which absorb energy from the incident flexural waves to the borders of the panel so that the panel could be considered anechoic. This study shows that the new arrangement with triangularly shaped actuators can achieve better control than the corresponding system using square actuators.

show abstract

“…In the early works actuator and sensor optimisation was performed assuming single frequency feedforward control. More recently, feedback strategies for noise and vibration attenuation over a broad frequency range have been considered [90,97,98]. In a few cases the actuator voltage itself is optimised rather than assuming a control strategy [95,96].…”

Section: Actuators and Sensorsmentioning

confidence: 99%

Analysis tools for the design of active structural acoustic control systems

nijhuis¹

View full text Add to dashboard Cite

most cases air, and cause pressure disturbances which are experienced as noise. This exchange of vibrational and acoustic energy is referred to as acoustoelastic interaction. Acousto-elastic interaction is described by time and space dependent disturbances, which propagate through the two media as waves, and are characterised by the wave propagation speed, frequency, wavelength and amplitude. The human ear is able to detect sound in the frequency range between 20 Hz and 20 kHz.Integration of noise and vibration issues in the design of consumer products, cars, machines, etc. can certainly improve the sound quality of such products, but it will not prevent noise problems. It is therefore common to tackle noise problems with additional means. The traditional way is to use passive methods, which are based on absorption and/or reflection of acoustic energy. Examples of absorption-based techniques are sound absorbing materials such as glasswool and foam and (coupled) tube resonators [1,2]. Sound can be reflected with single or double wall panels [3], for instance as shielding for noisy machinery. Passive methods provide an adequate solution to many noise problems, but have the drawback that they tend to be more attractive for the higher frequencies (> 1000 Hz). At low frequencies, passive methods often lead to an unacceptable increase in mass and volume.In contrast to passive methods, active control methods rely on an external energy source. Active control systems can take many forms, but such a system typically consists of sensors, to detect a response, an electronic controller, to suitably manipulate the sensor signals, and actuators, to influence the response. Active control is mainly suited for the low frequency range, where passive methods are less attractive [4]. The complementary use of active and passive methods is thus an attractive solution to noise (or vibration) problems. The subject of this thesis is an active control method for reducing the noise produced by vibrating structures. More precisely, the objective is to change the vibration of the structure in such a way that the sound radiation is reduced. Active control of sound and vibrationThe idea of active control of sound and vibration is not new. In 1936, Paul Lueg [5] patented a technique for controlling sound with additional sound. His idea is illustrated in Figure 1.1 for the control of a plane sound wave in a duct. An acoustic source A produces a sound wave s 1 , which propagates through the duct (from left to right). The components of the active control system are a microphone M , an electric controller V and a loudspeaker L. The • Smart aircraft wings [17]. The idea of using smart structures technology for shape control of aircraft wings is aimed at providing improved aerodynamic and aeroelastic performance compared to conventional wings. Researchers have for instance looked at hingeless trailing edge control surfaces ("flaps").• Active rotor blades [18,19,20]. During flight, helicopter rotor blades are exposed to unsteady aerodynamic loading con...

show abstract

Robust Feedback Control of a Baffled Plate via Open-Loop Optimization

Cited by 5 publications

References 16 publications

Comparison of smart panels for tonal and broadband vibration and sound transmission active control

Comparison of smart panels for tonal and broadband vibration and sound transmission active control

Smart panels with velocity feedback control systems using triangularly shaped strain actuators

Analysis tools for the design of active structural acoustic control systems

Contact Info

Product

Resources

About