scholarly journals A Study on non-linear trajectory shaped apparatus applied solar tracking device

2015 ◽  
Vol 10 (11) ◽  
pp. 1277-1284 ◽  
Author(s):  
Jae-Hyeon Han ◽  
Chae-Joo Moon ◽  
Young-Hak Chang ◽  
Man-Soo Choi ◽  
Young-Gon Kim ◽  
...  
Keyword(s):  
Linear Trajectory ◽  
Solar Tracking ◽  
Non Linear ◽  
Tracking Device

Solar Tracking Device Based on Electronic Compass and Accelerometer

2014 ◽  
Vol 981 ◽  
pp. 522-525 ◽  
Author(s):  
Zhong Ran Zhang ◽  
Yuan Ma ◽  
Bo Jiao ◽  
Tong Liang Liu
Keyword(s):  
Elevation Angle ◽  
Least Square Method ◽  
Least Square ◽  
Stable Operation ◽  
Solar Tracking ◽  
High Flexibility ◽  
Tracking Device ◽  
Solar Position ◽  
Electronic Compass ◽  
The Magnetic Field

A solar tracking device was designed in this paper. First, In order to determine the initial direction of the mechanism and the east, HMC5883L was used for measuring the magnetic field of earth. Then, the mechanism began to operate according to the solar position which was confirmed though the astronomical calculation. Finally, the azimuth and the elevation angle of solar were measured and corrected by HMC5883L and MPU6050 respectively. HMC5883L was calibrated by the ellipse fitting, which was obtained though the least square method. The horizontal error of HMC5883L was compensated. The experimental study was performed. And the results show that the solar tracking device has the characteristics of stable operation, high flexibility and low requirement of installation precision.

Control of a Permanent Magnet Synchronous Motor Using a Second-Order Non-Linear Trajectory Smoother

2005 ◽  
Vol 219 (8) ◽  
pp. 565-575 ◽  
Author(s):  
K M Tsang ◽  
J Wang
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnet Synchronous Motor ◽  
Experimental Studies ◽  
Variable Structure ◽  
Second Order ◽  
Linear Trajectory ◽  
System Parameters ◽  
Variable Structure System ◽  
Non Linear ◽  
Load Conditions

A second-order non-linear discrete trajectory smoother is coupled with conventional control law for servo-control of permanent magnet synchronous motors (PMSMs). Conventional control relies on three closed loops with linear proportional-integral-derivative (PID) controllers and gives an undesirable performance under the mismatch. of system parameters and load conditions. To overcome this drawback, a discrete-time second-order non-linear trajectory smoother is applied for the control of a PMSM. The second-order non-linear trajectory smoother is a non-linear variable structure system (VSS) catering for smooth trajectory generation for a motion control system. The trajectory smoother guarantees robustness against a change of system parameters and load conditions. Simulation and experimental studies are included to demonstrate the effectiveness of the proposed control scheme.

scholarly journals Education and Forecasting in Education in the Era of Post-Post...

2018 ◽  
pp. 69-81
Author(s):  
Tigran Marinosyan
Keyword(s):  
Education System ◽  
State Regulation ◽  
The State ◽  
Learning System ◽  
Vital Activity ◽  
Linear Trajectory ◽  
Modern Education ◽  
Non Linear ◽  
Long Term Forecasting

The author’s vision of the problem of long-term forecasting in education is presented in the article. The modern education, going beyond the limits of class-lesson learning system is gaining more and more territory in direct and figurative meanings. Its non-linear trajectory of movement and rhythm is a process that occurs by the model of Dispars - the principle of nomadic vital activity. The author is of the opinion that only a combination of forecasting with strategic and indicative planning as in Foresight technology may in a certain extent contribute to the state regulation of the education system.

A Novel Method for Solar Tracking

2014 ◽  
Vol 1006-1007 ◽  
pp. 805-810
Author(s):  
Wei Qu ◽  
Zhi Zhou ◽  
Guo Li Li ◽  
Wen Qiang Li ◽  
Peng Fei Wu
Keyword(s):  
Absorption Efficiency ◽  
The Sun ◽  
Solar Panels ◽  
Photoelectric Conversion ◽  
Solar Absorption ◽  
The North ◽  
Solar Tracking ◽  
Field Programmable ◽  
Novel Method ◽  
Tracking Device

A novel solar tracking method based on field programmable gate array (FPGA) is proposed to improve the photoelectric conversion rate of the solar cell unit area. In this method, the sun angle tracking is utilized to track, and tracking solar panels reach the altitude angle azimuth tracking position. Then four voltage signals of photo resistor sensors is used to compare the north-south direction and east-west direction respectively, in order to micro adjust the solar panels to getting same point voltage, enabling to achieve accurate sunlight tracking and positioning. Experimental results show that this method can accurately track the tracking the sun, and it has improving solar absorption efficiency of the solar tracking device.

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