Assessment of the Effectiveness of a Polar Fuzzy Approach for the Control of Centrifugal Compressors

Defoy, Benjamin; Alban, Thomas; Mahfoud, Jarir

doi:10.1115/1.4026468

Cited by 7 publications

(3 citation statements)

References 15 publications

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“…Previously, this approach was utilized successfully for the control of flexible rotors mounted on active magnetic bearings [8,9]. The aim in this work is to evaluate the effectiveness of the polar approach for the monitoring of turbomachinery.…”

Section: Introductionmentioning

confidence: 99%

Monitoring the Dynamic Behavior in Polar Domain for an Easier Diagnostic of Rotating Machinery

Mahfoud

Defoy²

2015

Proceedings of the 9th IFToMM International Conference on Rotor Dynamics

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The observation of the measurements in the polar domain can lead to an easier interpretation of the dynamic behavior, where the steady state and the transient behaviors could be directly distinguished. This transformation is simple and widely used in robotic. Numerical and experimental investigations are performed and presented in this paper. Experiments were performed on a test bench dedicated to the assessment of the aerodynamic behavior of a compressor impeller. The impeller is mounted at the free end of a rotor supported by two tilting pad bearings. Besides the unbalance excitations, the impeller is subject to low frequency aerodynamic perturbations. The results obtained show the effectiveness of this methodology for an easier monitoring and for the control of rotating machinery.

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Section: Introductionmentioning

confidence: 99%

Monitoring the Dynamic Behavior in Polar Domain for an Easier Diagnostic of Rotating Machinery

Mahfoud

Defoy²

2015

Proceedings of the 9th IFToMM International Conference on Rotor Dynamics

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“…Most of the models used to simulate rotor structural dynamics can be divided in two levels of complexity: those who consider rotor as a rigid body and develop their control law based only on this phenomenology and those who take into account the flexibility of the shaft (see Refs. [3][4][5][6][7][8]). Very few works simulate rotating blades flexibility in a system coupled with a controller acting in the stationary frame, like magnetic bearings.…”

Section: Introductionmentioning

confidence: 99%

Influence of Blade Flexibility on the Dynamic Response Simulation of a Turbomolecular Pump on Magnetic Bearings

Moreira

Thouverez

2020

Journal of Engineering for Gas Turbines and Power

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This paper proposes the simulation of a complete mechanical model of a turbomolecular pump rotor, including rotor and blades flexibility, suspended by controlled active magnetic bearings. The mechanical model is composed of an eight stage blisk, attached to a shaft. Magnetic forces are linearized by the first-order Taylor expansion around a given point. Including blades and rotor flexibility makes the mechanical system asymmetric, so the equations of motion for the coupled system have periodic terms. A modal controller was designed to control rigid body modes, since the number of sensors is limited and no state observer is implemented. PID controllers are used for low frequency modes combined with the second order filters to damp high frequency modes. First of all, stability analysis was carried out for the axisymmetric case. Second, blades flexibility was included. Forced response of the whole system to an impulsive force was studied. Divergent responses for the system in rotation were obtained as a second order filter pole possibly interacting with blades modes. Taking the second order filters off the control loop allowed the system to be stable. These results show that the analysis method developed here is efficient to evaluate the performance of a controller in closed loop with the complete flexible system. This method may be used in industrial design processes as computation times for the complete system are very short.

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“…They also enable the calculation of nuanced actions and take into account several data variations, thereby ensuring robust behavior (Fuh and Tung, 1997, Golob and Tovornik, 2003, Qiao and Mizumoto, 1996. Defoy et al, (2014) developed a new control strategy that utilizes polar coordinates. The originality of the methodology developed is that it manages two significant physical quantities, namely tangential and radial velocities, which are associated with steady state and transient behaviors, respectively.…”

Section: Introductionmentioning

confidence: 99%

Energy cost assessment of a polar based controller applied to a flexible rotor supported by AMB

Defoy¹,

Alban²,

Mahfoud

2015

Mechanical Engineering Journal

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From a designer point of view, optimizing the energy necessary for the control is an important element that could lead to downsize the control cabinet and to an increase of margins according to power amplifier capabilities. Also, reducing the energy used, generates a less significant environmental impact. The aim of this work was to develop and to assess a new approach using polar coordinates to observe and actuate the control of a flexible rotor supported by Active Magnetic Bearings (AMBs). Two fuzzy logic based controllers used to modulate the actuating forces were developed and assessed. The first is a SISO fuzzy PID controller for which the input is the displacement measured along an action line while the output is the force applied in the same direction. The second controller considers each bearing as a single MIMO system with the displacements in the two orthogonal directions as inputs, by managing two significant physical quantities, namely tangential and radial speeds. The "mechanical" performances are compared to those of an augmented PID controller. Then, the energy necessary for the control is compared. The study is first performed numerically and then validated experimentally. The results obtained show that the polar fuzzy controller presents the most suitable mechanical performances and energy costs

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Assessment of the Effectiveness of a Polar Fuzzy Approach for the Control of Centrifugal Compressors

Cited by 7 publications

References 15 publications

Monitoring the Dynamic Behavior in Polar Domain for an Easier Diagnostic of Rotating Machinery

Monitoring the Dynamic Behavior in Polar Domain for an Easier Diagnostic of Rotating Machinery

Influence of Blade Flexibility on the Dynamic Response Simulation of a Turbomolecular Pump on Magnetic Bearings

Energy cost assessment of a polar based controller applied to a flexible rotor supported by AMB

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