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Bearingless switched reluctance motor (SRM) has been a hot research topic for recent years. As the suspending force is important to bearingless SRM, optimization of suspending force for novel permanent magnet biased bearingless SRM is proposed in this paper. To get a better force performance, the permanent magnet's parameters (the physical dimensions) and some other parameters of the proposed motor...
In the high speed industrial application, bearingless motor, which integrates advantages of magnetic bearing into motor, has received more and more attention.[1-2] In this paper, stiffness analysis for one novel bearingless SRM with bias permanent magnet is investigated. Fig.1 shows the basic structure and prototype motor. It's a radial suspending structure equipped with permanent magnet to provide...
Switched Reluctance Motor (SRM) has good performance under special environments such as fault tolerance, robustness, tolerance of high temperature or in intense temperature variations. In the meanwhile, SRM has a good feature as magnetic bearing due to the inherent magnetic attraction radial force between rotor and stator poles[1]. This radial force can suspend the rotor. The bearing-less SRM combines...
Cervical remodeling begins early and the cervix progressively softens throughout pregnancy. Premature changes may be associated with preterm birth, but there is currently no clinical objective method for assessing the softness of the cervix. Shear wave speed estimation is a noninvasive technique to evaluate tissue mechanical properties. The goal of this study is to determine the discriminatory ability...
Theoretically analysis, and an in-depth research was made carried out on the implementation of force decoupling control of hydraulic shaking table. Because controlled DOF is 6 and the platform has 8 exciters, the whole control system is statically indeterminate, and this layout would produce huge endogenetic force during operation, so a pressure stabilized controller is used to reduce the force. The...
Acoustic radiation force based elasticity imaging methods utilize focused acoustic beams to mechanically excite tissue and ultrasonic correlation based methods to monitor the dynamic response of the tissue, which reflects the underlying tissue stiffness. Both qualitative images and quantitative images can be derived depending upon the selected beam sequences and data processing algorithms. Qualitative...
Ion channel is the regulatory mechanism for electrical activity in pancreatic islet cells through stimulus-secretion coupling. Changes in membrane potential are regulated by the glucose concentration-dependent ion channel activities. The alteration of glucose concentration is linked to the open probability of ATP-sensitive K+ channels by insulin secretion. At the meantime, the change of glucose concentration...
For questing anchoring mechanism and meeting anchor cable engineering's requirement of construction and design, this article research on anchoring mechanism of anchor cable with FLAC3D simulation software. The result indicates that rock mass around anchor pier forms a compression stress concentrating region, and rock mass around bonded section appear tensile stress and compression stress concentration...
Quantitative measurements of tissue stiffness can be obtained by measuring the speed of shear waves induced in tissue by acoustic radiation force. In homogeneous media, time-of-flight (TOF) measurements of shear wave speed (SWS) ideally are independent of the size of the region of interest (or reconstruction kernel). However, in heterogeneous media, shear wave morphology is altered by discontinuities...
The time-to-peak (TTP) displacement within the region of acoustic radiation force excitation (ROE) is directly related to the tissue shear modulus. It has previously been shown that the ROE TTP can be directly converted to shear modulus using a look-up table (LUT) for a given radiation force excitation focal configuration. While this method has the advantages of requiring less input data for stiffness...
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