Based on Ansoft computational tools, using finite element numerical method analytical the leakage magnetic field of asynchronous motor with closed rotor slots and bilateral closed slots, obtain the numerical relations...
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Based on a newly proposed monodromy operator, spectral criteria are developed for stability, observability and detectability of discrete-time Markov jump systems with periodically time-varying coefficients and transit...
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ISBN:
(纸本)9781467391054
Based on a newly proposed monodromy operator, spectral criteria are developed for stability, observability and detectability of discrete-time Markov jump systems with periodically time-varying coefficients and transition probability matrix. Moreover, it is shown that the obtained structural criteria have important applications in the analysis about asymptotic mean square stability of periodic Markov jump systems and stabilizing solution of periodic difference Riccati equations.
A detection system for measuring the position of spherical motor is designed. A cylindrical permanent magnetic resource is placed on the rotating shaft and rotates around the detection area. The magnetic field of the ...
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ISBN:
(纸本)9781479988068
A detection system for measuring the position of spherical motor is designed. A cylindrical permanent magnetic resource is placed on the rotating shaft and rotates around the detection area. The magnetic field of the detection point caused by the magnetic resource is analyzed using distributed multipo-le modeling method. An algorithm for solving the position of the spherical motor by utilizing the magnetic field parameters obtained from three-axis hall sensors is proposed. The method is validated by simulation. The results show that the method can meet the need of the position detection .The paper lays a foundation for closed loop control of spherical motor.
In this paper, the problem for the control of a class of single-input-single-output (SISO) non-affine nonlinear system with non-varnishing disturbance is investigated. A continuous nonlinear feedback structure is util...
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Image reconstruction for electrical resistance tomography (ERT) is a nonlinear and ill-posed inverse problem. In order to improve the imaging quality, compressed sensing (CS) is applied to measured signal recovery and...
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electrical resistance tomography (ERT) is to achieve visual detection through boundary sensors array to obtain the realtime distribution of the sensing field. As a nonradiant and unperturbed 2D/3D boundary technique, ...
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Multiphase flow is commonly encountered and of paramount significance in both natural and industrial processes. Accurate measurement on its process parameters is difficult to achieve due to its rheological complexity....
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Stratified two-phase flow is normal seen in many industrial applications. Measurement of the phase interfaces in it is important for the optimization of many industrial processes. In the paper, a shape reconstruction ...
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In this paper a nonlinear attitude tracking control scheme is developed for a small-scaled unmanned helicopter under input constraints. Via the analysis of the properties associated with the helicopter's rotor dyn...
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In the application of ultrasonic flowmeter, flow measurement has a low accuracy, since the length of straight pipe near the ultrasonic sensor is insufficient, especially the presence of the upstream disturbance. In th...
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ISBN:
(纸本)9781479961153
In the application of ultrasonic flowmeter, flow measurement has a low accuracy, since the length of straight pipe near the ultrasonic sensor is insufficient, especially the presence of the upstream disturbance. In this paper, in order to analyze the inherent relationship between the measurement error and the characteristics of flow field, two flow diagnostic criterions are proposed: asymmetry index (AR1, AR2) and cross flow (cf) indicator. Then the threshold range of the indexes is predicted by computational fluid dynamics numerical simulation in three non-ideal installations (single elbow, single elbow & rectifier, single elbow & 5 pipe diameter & rectifier). Finally, this diagnostic criterion is put forward to distinguish the three operating conditions, and verified by flow experiments. When AR1>0.019 or AR2 > 0.037 and cf > 0.005, the asymmetry and cross flow in the flow field cannot be ignored. At this time, flow measurement accuracy is greater than 1%. It is indicated that disturbance affect measurement accuracy. On the contrary, when diagnostic indexes are less than the threshold values, measurement accuracy can be guaranteed within 1%, which shows that disturbance have little impact on flow measurement.
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