Dynamics of symmetrical mode beating in complex coupling two-section DFB lasers

2008 ◽  
Vol 40 (5-6) ◽  
pp. 361-366
Author(s):  
Mohammed Al-Mumin
Keyword(s):  
Symmetrical Mode ◽  
Mode Beating

Design of symmetrical half-bridge converter with a series coupling capacitor

2020 ◽  
Vol 17 (5) ◽  
pp. 609-620
Author(s):  
Ruchi Rashmi ◽  
Shweta Jagtap
Keyword(s):  
Low Cost ◽  
Control Mode ◽  
Variable Load ◽  
Content Type ◽  
Symmetrical Mode ◽  
Coupling Capacitor ◽  
Switched Mode Power Supply ◽  
And Performance ◽  
Asymmetrical Mode ◽  
Voltage Control Mode

Purpose With the advancement of technology, size, cost, and losses of the switched mode power supply (SMPS) have been decreasing. However, due to the high frequency switching, design of magnetic drives and isolation circuits are becoming a crucial factor in SMPS. This paper presents design criteria, procedure and implementation of AC-DC half bridge (HB) converter with lower cost, smaller size and lower voltage stress on the power switch. Design/Methodology/approach The HB converter is designed in a symmetrical mode with a series coupling capacitor. Isolated power supplies are used for the converter and control circuit. Further, a transformer based isolated gate driver is used to drive both MOSFETs. The control IC works in voltage control mode to regulate voltage by controlling the duty cycle of the MOSFETs. Findings Control characteristics and performance of the HB converter is simulated using the MATLAB software and prototype of 170 W HB converter is built to validate the analytical results under variable load current and source voltage. The power quality and variation of load voltage at 2 A, 5 A, 7 A are reported. Originality/value This paper presents the design of a low-cost HB converter in a symmetrical mode which saves the additional cost of symmetric correction circuit normally required in asymmetrical mode design. This paper also focuses on the selection of primary and secondary side switch, series coupling capacitor, commuting diode, isolated drive and charge equalizer resistor.

scholarly journals The First Symmetrical Mode of Vibration of a Conical Shell

1949 ◽  
Vol 21 (4) ◽  
pp. 466-466
Author(s):  
H. C. Hardy ◽  
B. S. Ramakrishna
Keyword(s):  
Conical Shell ◽  
Symmetrical Mode

scholarly journals Investigation of High Lift Force Generation of Dragonfly Wing by a Novel Advanced Mode in Hover

Fluids ◽  
2020 ◽  
Vol 5 (2) ◽  
pp. 59
Author(s):  
Xiaohui Su ◽  
Kaixuan Zhang ◽  
Juan Zheng ◽  
Yong Zhao ◽  
Ruiqi Han ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Energy Expenditure ◽  
Lift Force ◽  
Lift Coefficient ◽  
Aerodynamic Performance ◽  
Dynamic Stall ◽  
Force Generation ◽  
High Lift ◽  
Dragonfly Wing ◽  
Symmetrical Mode

In the paper, a novel flapping mode is presented that can generate high lift force by a dragonfly wing in hover. The new mode, named partial advanced mode (PAM), starts pitching earlier than symmetric rotation during the downstroke cycle of the hovering motion. As a result, high lift force can be generated due to rapid pitching coupling with high flapping velocity in the stroke plane. Aerodynamic performance of the new mode is investigated thoroughly using numerical simulation. The results obtained show that the period-averaged lift coefficient, CL, increases up to 16% compared with that of the traditional symmetrical mode when an earlier pitching time is set to 8% of the flapping period. The reason for the high lift force generation mechanism is explained in detail using not only force investigation, but also by analyzing vortices produced around the wing. The proposed PAM is believed to lengthen the dynamic stall mechanism and enhance the LEV generated during the downstroke. The improvement of lift force could be considered as a result of a combination of the dynamic stall mechanism and rapid pitch mechanism. Finally, the energy expenditure of the new mode is also analyzed.

Effect of longitudinal laser mode beating in damage probability measurements

2013 ◽  
Author(s):  
Gintarė Batavičiūtė ◽  
Egidijus Pupka ◽  
Viktorija Pyragaitė ◽  
Linas Smalakys ◽  
Andrius Melninkaitis
Keyword(s):  
Laser Mode ◽  
Damage Probability ◽  
Mode Beating

Fluorescence Imaging of Waveguide Mode Beating and Propagation in Tapered and Bend Regions

2016 ◽  
Author(s):  
Brian D. Jennings ◽  
Nicolás Abadía ◽  
Chuan Zhong ◽  
Ertuğrul Karademir ◽  
David McCloskey ◽  
...  
Keyword(s):  
Fluorescence Imaging ◽  
Waveguide Mode ◽  
Mode Beating
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