Resistance Performance of Korean Small Coastal Fishing Boat in Low-Speed Range

2009 ◽  
Vol 46 (1) ◽  
pp. 10-23 ◽  
Author(s):  
Hyun-Woo Jee ◽  
Young-Gill Lee ◽  
Dae-Sun Kang ◽  
Yoon-Jin Ha ◽  
Young-Chan Choi ◽  
...  
Keyword(s):  
Low Speed ◽  
Fishing Boat ◽  
Speed Range ◽  
Resistance Performance

Novel Strategy for BLDC Motor Rotor Position Detection

2015 ◽  
Vol 772 ◽  
pp. 365-372
Author(s):  
Ling Zhi Cao ◽  
Sheng Hao Yang
Keyword(s):  
Motor Speed ◽  
Zero Crossing ◽  
Low Speed ◽  
Rotor Position ◽  
Voltage Difference ◽  
Position Detection ◽  
Position Signal ◽  
Speed Range ◽  
Terminal Voltage ◽  
Wide Speed Range

The detection of rotor position plays an important role in the motor speed-adjustment system. By analyzing the back-EMF method and its improved methods, we know the amplitude of back-EMF is too small to be detected when the motor run at low speed. A new detection method of rotor position has been proposed in this paper. It detects the zero crossing point of line terminal voltage difference to acquire the rotor position signal after a 90 degrees mechanical angle delay. The amplitude of line terminal voltage difference is large in wide speed range, so the rotor position signal can be accurately acquired in most situations. Simulation results proved that the new method can obtain the rotor position signal exactly in both high and low speed. It meets the wide speed range of motor.

Controllability Analysis of Flexible Variable Sweep Control Wing

2012 ◽  
Vol 542-543 ◽  
pp. 873-877
Author(s):  
Lai Bin Xu ◽  
Shu Xing Yang ◽  
Bo Mo
Keyword(s):  
Control Surface ◽  
Control Performance ◽  
Swept Wing ◽  
Sweep Angle ◽  
Low Speed ◽  
Control Effectiveness ◽  
Control Moment ◽  
Speed Range ◽  
Effective Angle ◽  
The Right

Variable Sweep Control Wing (VSCW) was introduced to generate the rolling control moment with the sweep angle differences between the left and the right wings. Influence flexible matrixes were generated to obtain the deflection of the effective angle of attack (AOA) of the flexible swept wing. Comparison between aileron control surface and VSCW shows that VSCW can get benefit from wing flexibility, which degrades the control effectiveness of the traditional aileron. The main advantage and difference from the traditional aircraft is that VSCW has higher control effectiveness and can prevent control reversal especially at high flight speed range; and at low speed, with an AOA variation device VSCW can get similar rolling control performance compared with traditional aileron control surface.

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