Hub-Based Vibration Control of Multiple Rotating Airfoils

Gy-ograve,; Sz-Uuml, rgy; Sz,; Flowers, George T.; Hartfield, Roy J.

doi:10.2514/2.5692

Cited by 7 publications

(1 citation statement)

References 11 publications

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“…However, if properly mistuned it was shown that the disk becomes controllable. Numerical control results of a mistuned disk controlled via shaft-based actuation were described in the work [11] and in [9,10]. The controllability analysis was based on a study of only time-invariant mode shapes while the time-variant vibration modes, known as parametric modes, which will occur due to vibration coupling between rotor and blades, were not considered.…”

Section: Introductionmentioning

confidence: 99%

Control of Rotor-Blade Coupled Vibrations Using Shaft-Based Actuation

Christensen

Santos

2006

Shock and Vibration

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When implementing active control into bladed rotating machines aiming at reducing blade vibrations, it can be shown that blade as well as rotor vibrations can in fact be controlled by the use of only shaft-based actuation. Thus the blades have to be deliberately mistuned. This paper investigates the dynamical characteristics of a mistuned bladed rotor and shows how, why and when a bladed rotor becomes controllable and observable if properly mistuned. As part of such investigation modal controllability and observability of a tuned as well as a mistuned coupled rotor-blade system are analysed. The dependency of the controllability and observability on varying rotational speed and mode shape interaction phenomena between parametric and basis mode shape components are also analysed. Numerical results reveal a limitation of the achievable controllability and observability, once quantitative measures of modal controllability and observability converge toward steady levels as the degree of mistuning is increased. Finally, experimental control results are presented to prove the theoretical conclusions and to show the feasibility of controlling rotor and blade vibrations by means of shaft-based actuation in practice.

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Section: Introductionmentioning

confidence: 99%

Control of Rotor-Blade Coupled Vibrations Using Shaft-Based Actuation

Christensen

Santos

2006

Shock and Vibration

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Dynamic model for high-speed rotors based on their experimental characterization

Santiyanes

Cuatzin

Vazquez

et al. 2016

2016 IEEE International Engineering Summit, II Cumbre Internacional De Las Ingenierias (IE-Summit)

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Rotating systems components such as rotors, have dynamic characteristics which are of great importance to understand because they may cause failure of turbomachinery. Therefore, it is required to study a dynamic model to predict some vibration characteristics, in this case, the natural frequencies and mode shapes (both of free vibration) of a turbocompressor shaft by using the finite element analysis (FEA). The peculiarity of the dynamic model is that it is based on input data obtained experimentally, so it is automatically validated by comparing the output data. The natural frequencies and mode shapes of the rotor were obtained with experimental modal analysis by using the impact test. The results predicted by the model are in good agreement with the experimental test. The model is also flexible with other geometries and has a great time and computing performance, which can be evaluated with respect to other commercial software's in the future.Index Terms-finite element analysis (FEA), modal analysis, natural frequency, rotordynamics.

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Active Rotor-Blade Vibration Control Using Shaft-Based Electromagnetic Actuation

Christensen

Santos

2004

Journal of Engineering for Gas Turbines and Power

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In this paper the feasibility of actively suppressing rotor and blade vibration via shaft-based actuation is studied. A mathematical model is derived, taking into account the special dynamical characteristics of coupled rotor-blade systems, such as centrifugal stiffened blades and parametric vibration modes. An investigation of controllability and observability shows that if the blades are properly mistuned, it is possible to suppress shaft as well as blade vibration levels by using only shaft-based actuation and sensing; though, in tuned bladed systems, shaft as well as blade actuation and sensing are required. In order to cope with the time-variant dynamics of the coupled rotor-blade system, a periodic time-variant modal controller is designed, implemented, and experimentally tested. A test rig built by four flexible blades is specially designed for this purpose. The rig is equipped with six electromagnetic actuators and different types of sensors (eddy-current displacement transducers, acceleration transducers, and strain gages) with the aim of monitoring and controlling shaft and blade vibration levels. Two different actively controlled rotor-blade system configurations are considered in the present study: (i) a tuned bladed rotor, controlled with help of actuators attached to the rotating blades and shaft-based actuators; (ii) a deliberately mistuned bladed rotor controlled only via shaft-based actuation. Experimental tests are carried out for both configurations. Some experimental problems regarding control implementation are identified and discussed, especially when the controller order and the number of actuators in the centralized control scheme become too high; though, for the mistuned bladed rotor controlled by using only shaft-based actuation, the controller works well.

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Hub-Based Vibration Control of Multiple Rotating Airfoils

Cited by 7 publications

References 11 publications

Control of Rotor-Blade Coupled Vibrations Using Shaft-Based Actuation

Control of Rotor-Blade Coupled Vibrations Using Shaft-Based Actuation

Dynamic model for high-speed rotors based on their experimental characterization

Active Rotor-Blade Vibration Control Using Shaft-Based Electromagnetic Actuation

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