The New Topology for the Realization ofz-Domain Transfer Functions of Switched Capacitor Networks for Adaptive Filtering

1988 ◽  
Vol 34 (4) ◽  
pp. 281-285
Author(s):  
U V Wali ◽  
R N Pal
Keyword(s):  
Adaptive Filtering ◽  
Transfer Functions ◽  
Switched Capacitor ◽  
Domain Transfer

Multivariable Transfer Functions for a Slewing Piezoelectric Laminate Beam

1995 ◽  
Vol 117 (3) ◽  
pp. 352-359 ◽  
Author(s):  
H. R. Pota ◽  
T. E. Alberts
Keyword(s):  
Air Force ◽  
Transfer Functions ◽  
Distributed Parameter ◽  
Laplace Domain ◽  
Distributed Parameter Model ◽  
Us Air Force ◽  
Beam Experiment ◽  
Special Cases ◽  
The Us ◽  
Domain Transfer

In this paper a distributed parameter model of a slewing beam system with piezoelectric actuators and sensors is considered. The system has a torque motor at a pinned (proximal) end, an endpoint motion sensor at the distal end, and patches of thin piezoelectric laminates attached to its surface. The partial differential equation of motion for this system is transformed to Laplace domain transfer functions after application of the appropriate boundary conditions. Transfer functions relating the various actuator/sensor pairs are developed. The results are shown to reduce to previously known results which are special cases of the system under consideration. Examples and experimental results are presented using a beam experiment at the US Air Force, Frank J. Seller Research Laboratory.

Implementation of Magnetic Suspension Control With FPGA

2007 ◽  
Author(s):  
Shuliang Lei ◽  
Andy Provenza ◽  
Alan Palazzolo ◽  
Raymond Beach
Keyword(s):  
Transfer Functions ◽  
Notch Filter ◽  
Magnetic Bearing ◽  
Magnetic Suspension ◽  
Iir Filters ◽  
Dynamic Spin ◽  
Domain Transfer ◽  
Radial Magnetic Bearing ◽  
And Control ◽  
Dsp Controller

This paper presents a methodology for an alternative implementation of DSP-based controllers typically used for magnetic bearing (MB) levitation and control on FPGA hardware. The approach takes s-domain transfer functions of the controller components and discretizes them using z-transform conversions into discrete time domain expressions. These expressions, which are essentially digital IIR filters, are synthesized and implemented to obtain downloadable bit-stream using Xilinx ISE software packages. In the example presented, the executable code was sent to configure the two FPGAs for control. An equivalent PD with notch filter FPGA-based controller was constructed to replicate an existing two-axis DSP controller used to control a radial magnetic bearing on a vertical rotor in the Dynamic Spin Rig Facility at NASA Glenn Research Center. The FPGA controller was successfully demonstrated on the NASA hardware.

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