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This paper firstly introduces the mathematical equations of PMSM (permanent magnet synchronous motor), an overview of direct torque control (DTC) and a DTC based on sliding mode control for PMSM, and then builds PMSM control system simulation models with above two methods in MATLAB /Simulink environment. Finally, we got the starting response, torque ripple and load perturbation responses of DTC and...
Aiming at planar linkage mechanisms considering joint clearance effects, a modular approach based on the link group theory and the graph theory is proposed to improve modeling efficiency. The massless link model to simulate joint clearances provides possibility for using modular approach to analyze the clearance effects. Meanwhile, this approach highlights the hierarchy and reusability of a defined...
Since the spot is elliptical when the cylindrical laser comes to the spatial plane, it proves that the laser spots in the CCD images, which are acquired by binocular stereo vision, are also elliptical. Through image edge extraction in image processing, it can obtain space equations of imaging ellipse edge by least square ellipse fitting, which can be transformed into the standard ellipse equations...
With the merits as far responding distance, hiding receiving and easy-deploying, the single observation passive location has a broad application in military domain and plays an important part in passive radar, navigation and aerospace, etc. With the information of phase-difference, phase-difference rate of change and Doppler frequency rate of change, a new algorithm called PFRC, based on EKF, is proposed...
The single observation passive location is the technique used by a single observation to determine the position and velocity of an emitter from the electromagnetic wave emitted by a target. The key point is how to obtain the position and the velocity of the emitter with high speed and precision. Up to now, two popular passive location methods have been put forward. They are Bearing-only (BO) and phase-difference...
To avoid the deficiency of the integrated navigation based on inertial navigation system (INS) and global position system (GPS), a new passive location algorithm is proposed and applied to aided navigation. In the algorithm, the position and the velocity of the aircraft can be estimated from the electromagnetic wave emitted by a radio broadcast of the enemy state. After giving the details of the algorithm,...
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