This work aims to give an insight into the influence of relevant constructive parameters on the performance of an axial flux induction machines with magnetically anisotropic rotor (AR-AFIM). The torque-slip characteri...
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ISBN:
(纸本)9781728151359
This work aims to give an insight into the influence of relevant constructive parameters on the performance of an axial flux induction machines with magnetically anisotropic rotor (AR-AFIM). The torque-slip characteristic, efficiency, and power factor of several designs of a 72-slot 24-pole AR-AFIM are assessed by means of two 3-D finite element models: a reduced and a full model. The first one is used to speed evaluate performance indices performing a sweep of relevant constructive parameters, while the second is used for validation purposes. The conclusions obtained through both models were in good agreement. Specifically, it was found that variations of the rotor axial length, slot height, and air gap length have a significant effect on the performance of the machine, whilst slight deviations from the original iron/copper ratio of the anisotropic rotor do not have a significant impact on the machine performance.
A deep knowledge of the piezoelectric probe parameters is mandatory for optimizing the responses in typical ultrasonic transceivers used for Non-Destructive Evaluation and Medical Imaging. But, usually, practical cons...
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ISBN:
(纸本)9781467356862
A deep knowledge of the piezoelectric probe parameters is mandatory for optimizing the responses in typical ultrasonic transceivers used for Non-Destructive Evaluation and Medical Imaging. But, usually, practical construction details are not known for the users of commercial probes. A prediction of these data is necessary during the simulation tasks intended to improve the final performances of these broadband transceivers. Here, a Genetic Algorithmic (GA) based option is aimed to make "a posteriori" estimations of five internal parameters, in broadband piezoelectric probes acoustically matched to radiation media, under realistic spike excitation. An original GA procedure is described for "inverse" prediction of internal data, using a matrix model for the matched ultrasonic probes. Up to five probe characteristics could be found with this approach. Agreement in the probe input admittance vertical bar Y-in vertical bar curve was used as an index of good estimation. In spite of noisy transfer function measurements and distortions in experiments, good results were obtained in the parameters estimations, and in the experimental vs estimated comparisons. This proves that our GA procedure is a valuable tool to discover hidden design data in matched ultrasonic probes.
A deep knowledge of the piezoelectric probe parameters is mandatory for optimizing the responses in typical ultrasonic transceivers used for Non-Destructive Evaluation and Medical Imaging. But, usually, practical cons...
详细信息
ISBN:
(纸本)9781467356855
A deep knowledge of the piezoelectric probe parameters is mandatory for optimizing the responses in typical ultrasonic transceivers used for Non-Destructive Evaluation and Medical Imaging. But, usually, practical construction details are not known for the users of commercial probes. A prediction of these data is necessary during the simulation tasks intended to improve the final performances of these broadband transceivers. Here, a Genetic Algorithmic (GA) based option is aimed to make "a posteriori" estimations of five internal parameters, in broadband piezoelectric probes acoustically matched to radiation media, under realistic spike excitation. An original GA procedure is described for "inverse" prediction of internal data, using a matrix model for the matched ultrasonic probes. Up to five probe characteristics could be found with this approach. Agreement in the probe input admittance |Y_(in)| curve was used as an index of good estimation. In spite of noisy transfer function measurements and distortions in experiments, good results were obtained in the parameters estimations, and in the experimental vs estimated comparisons. This proves that our GA procedure is a valuable tool to discover hidden design data in matched ultrasonic probes.
In this paper, the mathematical model of vibrations of the micromechanical gyroscope and the design algorithm of the constructive parameters of its working elements are proposed.
ISBN:
(纸本)9789662191004
In this paper, the mathematical model of vibrations of the micromechanical gyroscope and the design algorithm of the constructive parameters of its working elements are proposed.
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