Stability control system for an automatic control system
First Claim
1. A stability control system for use in an automatic control system comprising:
- a controlled system;
response characteristic measuring means for measuring a response characteristic of said controlled system;
frequency response computing means for processing the response characteristic measured by said response characteristic measuring means to obtain a standard frequency transfer function having a standard frequency characteristic, and a varied frequency transfer function having a frequency characteristic with a permissive variation to the standard frequency transfer function;
band division means for dividing the standard frequency transfer function and the varied frequency transfer function obtained by said frequency response computing means into a plurality of bands, respectively;
modeling means for mathematically approximating the standard frequency transfer function for each band divided by said band division means to obtain a standard approximate model for each band, and mathematically approximating the varied frequency transfer function for each band to obtain a varied approximate model for each band, respectively;
variation computing means for computing a variation of the varied approximate model to the standard approximate model for each band;
modern controller setting means for setting a modern controller for the variation in each band computed by said variation computing means, respectively, to provide a plurality of modern controllers;
parallel processing means for processing the plurality of modern controllers in parallel with each other; and
actuating means for actuating said controlled system according to a result processed by said parallel processing means.
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Abstract
The invention is directed to a stability control system for an automatic control system, which includes a controlled system, a measuring unit for measuring a response characteristic of the controlled system, and a computing unit for processing the response characteristic to obtain a standard frequency transfer function and a varied frequency transfer function with a permissive variation to the standard frequency transfer function. A band division unit is provided for dividing the standard frequency transfer function and the varied frequency transfer function into a plurality of bands, respectively. A modeling unit is provided for mathematically approximating the standard frequency transfer function for each band and the varied frequency transfer function for each band, to obtain a standard approximate model and a varied approximate model, respectively. A variation computing unit is provided for computing a variation of the varied approximate model to the standard approximate model for each band. According to the variation in each band, a modern controller, e.g., H∞ controller is set, thereby to provide a plurality of modern controllers, which are processed by a parallel processing unit in parallel with each other. Then, the controlled system is actuated according to a result processed by the parallel processing unit.
37 Citations
5 Claims
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1. A stability control system for use in an automatic control system comprising:
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a controlled system; response characteristic measuring means for measuring a response characteristic of said controlled system; frequency response computing means for processing the response characteristic measured by said response characteristic measuring means to obtain a standard frequency transfer function having a standard frequency characteristic, and a varied frequency transfer function having a frequency characteristic with a permissive variation to the standard frequency transfer function; band division means for dividing the standard frequency transfer function and the varied frequency transfer function obtained by said frequency response computing means into a plurality of bands, respectively; modeling means for mathematically approximating the standard frequency transfer function for each band divided by said band division means to obtain a standard approximate model for each band, and mathematically approximating the varied frequency transfer function for each band to obtain a varied approximate model for each band, respectively; variation computing means for computing a variation of the varied approximate model to the standard approximate model for each band; modern controller setting means for setting a modern controller for the variation in each band computed by said variation computing means, respectively, to provide a plurality of modern controllers; parallel processing means for processing the plurality of modern controllers in parallel with each other; and actuating means for actuating said controlled system according to a result processed by said parallel processing means. - View Dependent Claims (2, 3, 4, 5)
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Specification