Frequency response function measurement of a rotor system utilizing electromagnetic excitation by a built-in motor

Ren, Yang; Tsunoda, Wataru; Han, Deren; Zhong, Jianpeng; Shinshi, Tadahiko

doi:10.1299/jamdsm.2020jamdsm0043

Cited by 3 publications

(2 citation statements)

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“…In these publications, active magnetic bearings (AMBs) are used as an excitation system in addition to the existing support in ball bearings. Similarly, in [12], a bearingless motor is used to excite a system with oil-film bearings. Related work can also be found in [13], where the parameters of the oil-film bearings and the bearingless motor are identified through a regression by varying unbalance and controller parameters.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Identification of Free and Supported Frequency Response Functions of a Rotor in Active Magnetic Bearings

et al. 2022

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Frequency response functions (FRFs) of rotor systems can be used as indicator functions for condition monitoring. Component-wise FRFs are of high interest to locate errors in the case of defects. To enable continuous monitoring, measurements should be taken during operation. This contribution shows methods of using active magnetic bearings (AMBs) for simultaneously determining different FRFs of a rotor system. The AMBs, in addition to supporting the rotor, are used simultaneously as sensors and actuators. Two different types of FRFs, namely, the one associated with the free rotor and with the supported rotor can be determined from a single experiment. This procedure does not need any change in the assembly because the AMBs are simultaneously used as bearing and excitation device. Considering as excitation the total bearing force of the AMBs results in the FRF of the free rotor. The FRF of the supported system is determined by considering a perturbation force only, which is applied on top of the controlled AMB force. As a showcase, an academic rotor test rig is used with and without rotation to verify the applicability of the method. To evaluate and interpret the results of the experiments, a numerical model of the rotor using finite-element formulations is used.

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Section: Introductionmentioning

confidence: 99%

Simultaneous Identification of Free and Supported Frequency Response Functions of a Rotor in Active Magnetic Bearings

et al. 2022

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“…In our previous research [17,18], the UMF was utilized as a radial excitation force. Excitation forces at different frequencies were realized by injecting a sweep frequency d-axis current into the motor windings.…”

Section: Introductionmentioning

confidence: 99%

Estimation of the Dynamic Parameters of the Bearings in a Flexible Rotor System Utilizing Electromagnetic Excitation by a Built-In Motor

et al. 2021

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Estimation of the dynamic parameters of bearings is essential in order to be able to interpret the performance of rotating machinery. In this paper, we propose a method to estimate the dynamic parameters of the bearings in a flexible rotor system. By utilizing the electromagnetic excitation generated by a built-in PM motor and finite element (FE) modeling of the rotor, safe, low-cost, and real-time monitoring of the bearing dynamics can be achieved. The radial excitation force is generated by injecting an alternating d-axis current into the motor windings. The FE model of the rotor and the measured frequency responses at the motor and bearing locations are used to estimate the dynamic parameters of the bearings. To evaluate the feasibility of the proposed method, numerical simulation and experiments were carried out on a flexible rotor system combined with a bearingless motor (BELM) having both motor windings and suspension windings. The numerical simulation results show that the proposed algorithm can accurately estimate the dynamic parameters of the bearings. In the experiment, the estimates made when utilizing the excitation force generated by the motor windings are compared with the estimates made when utilizing the excitation force generated by the suspension windings. The results show that most of the stiffness and damping coefficients for the two experiments are in good agreement, within a maximum error of 8.92%. The errors for some coefficients are large because the base values of these coefficients are small in our test rig, so these coefficients are sensitive to deviations. The natural frequencies calculated from the dynamic parameters estimated from the two experiments are also in good agreement, within a maximum relative error of 3.04%. The proposed method is effective and feasible for turbomachines directly connected to motors, which is highly significant for field tests.

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電磁力を用いた回転機械の診断と振動抑制

SHINSHI

2023

Journal of the Japan Society for Precision Engineering

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Frequency response function measurement of a rotor system utilizing electromagnetic excitation by a built-in motor

Cited by 3 publications

References 13 publications

Simultaneous Identification of Free and Supported Frequency Response Functions of a Rotor in Active Magnetic Bearings

Simultaneous Identification of Free and Supported Frequency Response Functions of a Rotor in Active Magnetic Bearings

Estimation of the Dynamic Parameters of the Bearings in a Flexible Rotor System Utilizing Electromagnetic Excitation by a Built-In Motor

電磁力を用いた回転機械の診断と振動抑制

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