Abstract: A data communication analysis and simulation tool capable of simulating in real time the transmissions and data responses of at least one line replaceable unit communicating on at least one communication bus with at least one line replaceable unit under test, comprising a computer operating under a real time operating system and having available memory and means for accepting user input, and a programmed simulator resident in said computer comprising a plurality of processes to effectuate the simulation of the transmissions and data responses of at least one line replaceable unit. The programmed simulator allocates a portion of the available memory as a shared memory segment serving as a central database and supporting inter-process communication. The programmed simulator further generates graphical and textural images in response to communicated data from the line replaceable unit under test and user input to a monitor coupled to the computer.
Type:
Grant
Filed:
May 27, 1994
Date of Patent:
November 21, 2000
Assignee:
Hamilton Sundstrand Corporation
Inventors:
Arnold A. Ames, Charles H. Gooden, Donald P. Krakauskas, Vinod George
Abstract: The present invention measures the Fourier coefficients of each controlled harmonic in a signal beginning in a present cycle of the fundamental frequency with a switching angle corresponding to each controlled harmonic and predicts what these Fourier coefficients will be before the occurrence of a corresponding switching angle in a subsequent cycle. The present invention also predicts what these Fourier coefficients would be if the corresponding switching angle in the subsequent cycle is varied. Each switching angle is then varied in the subsequent cycle only if the associated harmonic would be improved thereby; otherwise, that switching angle in not varied in the subsequent cycle.
Abstract: A method of linearizing the output performance of a switched reluctance generator, comprises the steps of exciting the switched reluctance generator during a first phase of operation at a turn-on angle which need not be accurately calculated to produce the desired excitation current. Next, during a second phase of commutation, the switched reluctance generator is freewheeled when a phase current of the switched reluctance generator exceeds a first calculated current level. This freewheeling continues until the phase current of the switched reluctance generator exceeds a second calculated current level, at which point the switched reluctance generator enters the generation phase of its commutation cycle. The linearization of the performance occurs because the first and second calculated current levels are calculated as a function of energy converted per electrical cycle.