A novel approach to reduce fan rotor blades stress in case of resonance due to inlet flow distortion by means of piezoelectric actuators

Rossi, Andrea; Botta, Fabio; Giovannelli, Ambra; Belfiore, Nicola Pio

doi:10.1016/j.jsv.2023.117552

Cited by 7 publications

(5 citation statements)

References 38 publications

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“…For instance, in a turbomachinery blade vibration framework, g(x, t) is represented by an aerodynamic load, which is proportional to the rotor speed and matches one of the blade eigenmodes. Such loads can be calculated via computational fluid dynamics simulations, as reported in [29]. The calculation of δL p is done by considering that the procedure requires the whole beam to be covered with piezoelectric plates and the identification of the optimal potential distribution to maximise their damping effectiveness was the aim of this work.…”

Section: Optimal Voltage Distribution On Piezoelectric Actuators Coup...mentioning

confidence: 99%

Optimised Voltage Distribution on Piezoelectric Actuators for Modal Excitations Damping in Tapered Beams

Rossi

Botta

2023

Actuators

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Vibration mitigation is a prominent matter in several engineering fields. Several adverse phenomena are related to vibrations, such as fatigue, noise, etc. The availability of smart materials increases the solutions for both vibration damping and energy harvesting applications. Piezoelectric materials seem to be the most promising for these applications. However, their positioning significantly affects their efficiency. Several studies were performed on the positioning of piezoelectric actuators to dampen a target resonance in cantilever beams with constant cross-sections. Here, an analytical model for the optimal voltage distribution on an array of piezoceramic (PZT) actuator pairs is proposed in the case of tapered beams. The effect of tapering on the optimal voltage distribution was investigated for several eigenmode excitations and tapering ratios. The model outcomes were corroborated via FEM simulations and a fair agreement was found for each considered case.

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Section: Optimal Voltage Distribution On Piezoelectric Actuators Coup...mentioning

confidence: 99%

Optimised Voltage Distribution on Piezoelectric Actuators for Modal Excitations Damping in Tapered Beams

Rossi

Botta

2023

Actuators

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“…For example, in Refs. [5,14], it was demonstrated that an active damping system based on PZT actuator arrays can always operate at its maximum effectiveness if the voltage electrically is optimized according to the excited mode. However, the proposed active controls require vibration detection systems to be effectively implemented, and both the accuracy of the measurement device exploited to detect the excited eigenmodes and the corresponding vibration amplitude play a key role.…”

Section: Introductionmentioning

confidence: 99%

Accuracy Characterization of a MEMS Accelerometer for Vibration Monitoring in a Rotating Framework

et al. 2023

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Active and passive vibration control systems are of paramount importance in many engineering applications. If an external load excites a structure’s resonance and the damping is too low, detrimental events, such as crack initiation, growth and, in the worst case, fatigue failure, can be entailed. Damping systems can be commonly found in applications such as industrial machines, vehicles, buildings, turbomachinery blades, and so forth. Active control systems usually achieve higher damping effectiveness than passive ones, but they need a sensor to detect the working conditions that require damping system activation. Recently, the development of such systems in rotating structures has received considerable interest among designers. As a result, the development of vibration monitoring equipment in rotating structures is also a topic of particular interest. In this respect, a reliable, inexpensive and wireless monitoring system is of utmost importance. Typically, optical systems are used to measure vibrations, but they are expensive and require rather complex processing algorithms. In this paper, a wireless system based on a commercial MEMS accelerometer is developed for rotating blade vibration monitoring. The proposed system measurement accuracy was assessed by means of comparison with a reference wired measurement setup based on a mini integrated circuit piezoelectric (ICP) accelerometer adapted for data acquisition in a rotating frame. Both the accelerometers were mounted on the tip of the blade and, in order to test the structure under different conditions, the first four blade resonances were excited by means of piezoelectric actuators, embedded in a novel experimental setup. The frequency and amplitude of acceleration, simultaneously measured by the reference and MEMS sensors, were compared with each other in order to investigate the viability and accuracy of the proposed wireless monitoring system. The rotor angular speed was varied from 0 to 300 rpm, and the data acquisitions were repeated six times for each considered condition. The outcomes reveal that the wireless measurement system may be successfully used for vibration monitoring in rotating blades.

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“…However, piezoceramics have been implemented in several applications such as: energy harvesting [6], micro-actuators for subspace aircraft [9], wings actuation in drones [10], vibration damping in cantilever beam under support motion [11], turbomachinery blades vibration [12][13][14][15], axial compressor vibration damping [16], rotating plates vibration control [17], and active fan blades vibration [18,19].…”

Section: Introductionmentioning

confidence: 99%

Optimal Voltage Distribution on PZT Actuator Pairs for Vibration Damping in Beams with Different Boundary Conditions

Rossi

Botta

2023

Actuators

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In recent decades, many studies have been conducted on the use of smart materials in order to dampen and control vibrations. Lead zirconate titanate piezoceramics (PZT) are very attractive for such applications due to their ability of delivering high energy strain in the structure. A pair of piezoelectric actuators can actively dampen the resonances of the structure, but the damping effectiveness strongly relies on its location. Damping effectiveness can be substantially increased if the structure is fully covered with PZT actuator pairs and the voltage distribution on each pair is optimized. In this way, each actuator pair contributes to the vibration attenuation and only the driving voltage’s sign, distributed on each actuator pair, needs to be identified for each resonance. This approach is here applied to the case of Euler–Bernoulli beams with constant cross-section and the optimal voltage distribution is investigated for several boundary conditions. The theoretical model results were corroborated with finite element simulations, which were carried out considering beams covered by ten PZT actuator pairs. The numerical results agree remarkably well with the theoretical predictions for each examined case (i.e., free-free, pinned-pinned, and fixed-fixed).

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A novel approach to reduce fan rotor blades stress in case of resonance due to inlet flow distortion by means of piezoelectric actuators

Cited by 7 publications

References 38 publications

Optimised Voltage Distribution on Piezoelectric Actuators for Modal Excitations Damping in Tapered Beams

Optimised Voltage Distribution on Piezoelectric Actuators for Modal Excitations Damping in Tapered Beams

Accuracy Characterization of a MEMS Accelerometer for Vibration Monitoring in a Rotating Framework

Optimal Voltage Distribution on PZT Actuator Pairs for Vibration Damping in Beams with Different Boundary Conditions

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