Digital time‐delay beamformer for sonar systems

1982 ◽  
Vol 72 (5) ◽  
pp. 1660-1660
Author(s):  
Adrian van’t Hullenaar
Keyword(s):  
Time Delay ◽  
Sonar Systems ◽  
Digital Time

Digital time‐delay beamformer for sonar systems

1981 ◽  
Vol 70 (6) ◽  
pp. 1811-1811
Author(s):  
Adrian van’t Hullenaar
Keyword(s):  
Time Delay ◽  
Sonar Systems ◽  
Digital Time

Digital time delay network for an active underwater acoustic coating

1993 ◽  
Vol 93 (3) ◽  
pp. 1613-1619 ◽  
Author(s):  
Thomas R. Howarth ◽  
Xiaoqi Bao ◽  
Robert Moser ◽  
Vijay K. Varadan ◽  
Vasundara V. Varadan
Keyword(s):  
Time Delay ◽  
Underwater Acoustic ◽  
Digital Time

Implementation of chaotic circuits with a digital time-delay block

2011 ◽  
Vol 67 (1) ◽  
pp. 345-355 ◽  
Author(s):  
Viet-Thanh Pham ◽  
Luigi Fortuna ◽  
Mattia Frasca
Keyword(s):  
Time Delay ◽  
Chaotic Circuits ◽  
Digital Time

Efficient chroma subsampling strategy for compressing digital time delay integration mosaic video sequences in H.264/AVC

2011 ◽  
Vol 20 (2) ◽  
pp. 023011 ◽  
Author(s):  
Kuo-Liang Chung ◽  
Wei-Jen Yang ◽  
Chyou-Hwa Chen ◽  
Hong-Yuan Mark Liao ◽  
Sheng-Mao Zeng
Keyword(s):  
Time Delay ◽  
Video Sequences ◽  
Digital Time ◽  
Time Delay Integration

Dynamic Analysis and Control of High Speed and High Precision Active Magnetic Bearings

1992 ◽  
Vol 114 (4) ◽  
pp. 623-633 ◽  
Author(s):  
K. Youcef-Toumi ◽  
S. Reddy
Keyword(s):  
Time Delay ◽  
High Speed ◽  
Dynamic Stiffness ◽  
Magnetic Bearing ◽  
Magnetic Bearings ◽  
Successful Operation ◽  
Highly Nonlinear ◽  
Wide Range ◽  
And Control ◽  
Digital Time

The successful operation of actively controlled magnetic bearings depends greatly on the electromechanical design and control system design. The function of the controller is to maintain bearing performance in the face of system dynamic variations and unpredictable disturbances. The plant considered here is the rotor and magnetic bearing assembly of a test apparatus. The plant dynamics consisting of actuator dynamics, rigid rotor dynamics and flexibility effects are described. Various components of the system are identified and their corresponding linearized theoretical models are validated experimentally. Tests are also run to identify the coupling effects and flexibility modes. The highly nonlinear behavior of the magnetic bearings in addition to the inherent instability of such a system makes the controller design complex. A digital Time Delay Controller is designed and its effectiveness evaluated using several simulations based on linear and nonlinear models for the bearing including bending mode effects. This controller is implemented as an alternative to an existing linear analog compensator. Several experiments are conducted with each controller for spinning and nonspinning conditions. These include time responses, closed loop frequency responses and disturbance rejection responses. The experimental results and comparisons between those of a digital Time Delay Controller and an analog compensator indicate that the Time Delay Controller has impressive static and dynamic stiffness characteristics for the prototype considered. The Time Delay Controller also maintains almost the same dynamic behavior over a significantly wide range of rotor speeds.

Digital time-delay beamforming with interpolated signals

2004 ◽  
Vol 84 (12) ◽  
pp. 2403-2423 ◽  
Author(s):  
Sigmar Ries
Keyword(s):  
Time Delay ◽  
Digital Time
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