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In this paper, an adaptive TSK-fuzzy rotor resistance observer (ATFRO) is proposed and embedded into the induction motor vector control system. The proposed observer consists of adaptive rotor resistance observer, TSK-fuzzy control (TSKFC), and projection algorithm (PA). The estimated rotor resistance value enters into the adaptive pseudo-reduced-order flux observer (APRO) to decrease sensitivity...
Servo punch press uses a servo motor to drive. It can set different stroke length and velocity according to different production requirements, and can always ensure the formation precision of the bottom dead center. It has the advantages of high efficiency, high precision and low noise, and it has become the development trend of punch press. The key point of the servo punch press development is its...
Mobile learning is now widely used all over the world simply because it allows students to learn anytime and anywhere through the information and communication technologies (ICT). Through the interaction between teachers and students, and exchanges among the peer groups, students can practise all kinds of learning activities. Its portability and ability to be interactive facilitate its support to...
This study is to determine the influence of creative thinking instruction information technology integrated into the mechanical professional subjects of vocational high schools. This research has adopted the “nonequivalent pretest — posttest control group design” in quasi-experiment design. The study instruments include: The “Torrance creative thinking ability” and questionnaire survey on the learning...
The droughts occur frequently in China, and it is urgent requirement for drought monitoring in a large region. Real-time monitoring and timely reporting of drought is important decision information for drought disaster prevention and mitigation. From the view of business process, the paper proposes the method to build system using remote sensing data, which includes MODIS data access, data processing,...
As powerful and practical engineering software, MATLAB is used in data analysis and processing widely. This paper describes an example of separating noise from the raw speech. Firstly, high frequency noise is added to the speech signal. And then the principle of short time Fourier transform is analysis. Finally, a filter is designed to process the actual acquisition of a voice signal with noise. It...
The forces on the slide of 80MN titanium-alloy forging hydraulic press are analyzed thoroughly. Based on equivalent of deformation stress, the function relation between the positions of the measurement points and the forces on the slide is deduced and the dynamic model of the slide is set up to realize more accurate control of 80MN titanium-alloy forging hydraulic press.
A novel iterative parameter estimate method for Polynomial Phase Signal is established based on Zero-Extremum Crossing Test (ZECT) and Lest-Square (LS) principle. The ZECT is developed firstly. Then the Polynomial Fitting (PF) for the phase parameters and the linear fitting for the varying amplitude are performed alternatively. The obtained date are inserted into the next step estimation. The efficiency...
A new type of double-layer plastic greenhouse was designed and analyzed, which can effectively reduce the displacement of arch, and increases the overall structural stability of arching in different direction. Using three-dimensional modeling software, the mechanical model of outside shed is built, and the stability is accurately analyzed by finite element analysis software. Calculation results show...
In order to reject disturbance from the variation of load, an estimation method for load parameters for PMSM is presented to online identify moment of inertia and load torque. This method is based on model reference adaptive system through Popov's Hyper stability criteria. The two quantities are essential for the PI controller to be adaptive for maintaining the system's robustness. The simulation...
With the further development of GPS and rising of new positioning system, the ground coverage rate has become a hot research object. As a mature software, STK can solve aerospace problem rapidly and accurately. The paper innovatively uses STK software to measure the coverage rate of GPS. After giving the previous result, the paper propounds a further discussion of coverage rate: the level of accuracy...
An atomic force microscope (AFM)-based probe applied to detect laser induced surface acoustic wave (SAW) is presented. A YAG pulsed laser source is used to generate the laser induced SAW. The AFM-based probe utilizes a tip attached to a cantilever to detect surface nano-vibration through an interaction of atomic force between the tip and the surface. When the pulsed laser beam irradiates the target...
The problems are analyzed during the teaching process of analog electronics course. To solve these problems the project-based learning method (PBLM) is used to explore the teaching reform theory and practice. In the light of characteristics and requirement of analog electronics course, the five key steps of PBLM is designed and introduced by a practical example. Practice of teaching students shows...
For civil air defence geographic information data with large amount of data, data type complex, with geographic space information and attributes information, the ArcSDE the characteristics of the data storage and management, to achieve the geographic data pretreatment, geographic information management, visualization, inquires the statistics, the terrain analysis, navigation and positioning, information...
The SMDO (Sliding Mode Disturbance Observer) is introduced in optimal attitude maneuver control law for high-precision attitude control of flexible spacecraft which consists of rigid central body and flexible appendages. First, an theta-D optimal attitude maneuver control law is adopted, then an SMDO is designed based on internal model principle. Furthermore, the attitude control system stability...
In this paper, we present a new architecture (called multi-agent-particle-system, MAPS) to controlling the running of particle system. The MAPS consisted of external-senor-agent (called ESA, perceive external environment situation such as wind direction, humidity and altitude), initial-particle-agent (called IPA, finishes initial working for particles), update-particle-agent (called UPA, updating...
Light signals is turned into electrical signals by the photoelectric sensor. The amplifier circuit amplify weak current signal to a certain range of voltage signals[1], using high-precision 16-bit AD converter MAX1134 into digital signal. MCU control segment LCD displaying the data, and finally through the exact calibration display the values of illumination. Experiments show that the circuit design...
With people attention to sustainable development and environmental pollution, distributed generation(DG) technology with its unique environment and economy raises more and more concern. The rapid development of DG technology results in large-capacity distributed power connected to the grid, but DG affected by natural conditions will can not output power continuously and stably. And DG usually is incorporated...
Firstly, the interpretation attack is analyzed deeply, the Embedding is ruled by the digital watermark's relationship, And a way to create relationship are proposed, which bases on the interrelation of information. Then the construction and transmitting model of relationship algorithm is established, And on the base of that, the restriction process of digital watermark's relationship to interpretation...
In this paper, a novel brushless doubly-fed machine (BDFM) with the double-sine wound rotor (DSW rotor) for stand-alone ship shaft generator application is designed. The performance studies of the prototype DSW-rotor BDFM with 4 and 2 pole pairs by using the finite element analysis model and the experimental method are presented. The magnetic fields, air-grip flux destiny distribution and the on-load...
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