Show simple item record

dc.contributor.advisorDorf, Richard C.
dc.contributor.authorFarren, Merritt C.
dc.contributor.authorPhillips, Charles A.
dc.date.accessioned2012-08-29T23:28:14Z
dc.date.available2012-08-29T23:28:14Z
dc.date.issued1960
dc.identifier.urihttp://hdl.handle.net/10945/11559
dc.description.abstractSampled-data control systems generally have fixed sampling frequencies which must be set high enough to give satisfactory performance for all anticipated conditions, A study is made here of an adaptive system which varies the sampling frequency by measuring a system parameter. It is shown, that a sampler followed by a zero-order hold whose sampling period is controlled by the absolute value of the first derivative of the error signal will be a more "efficient" sampler than a fixed frequency sampler. That is, over a given time interval, fewer samples are needed with the variable frequency system than with a fixed frequency system while maintaining essentially the same response characteristics. Analog computer studies of simple type 1 and type 2 sampled-data servo systems with error sampling and unity feedback verified the method . Standard analog computer components were used to set up a simulated servo system, a rate detector, absolute value detector, a voltage controlled oscillator, and a sampler and zero-order hold. The system described reduced the number of samples required for response to a step input to about three-quarters that required in a fixed sampling frequency system. Over a long period of time, savings in the number of samples required can be expected to be between twenty-five and fifty per cent. In many applications, the saving produced by reducing the overall number of samples required may outweigh the added complexity of the adaptive sampling frequency system.en_US
dc.description.urihttp://www.archive.org/details/adaptivesampling00farr
dc.language.isoen_US
dc.publisherMonterey, California: U.S. Naval Postgraduate Schoolen_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.en_US
dc.titleAdaptive sampling frequency for sampled-data control systemsen_US
dc.typeThesisen_US
dc.contributor.departmentElectrical Engineering
dc.description.serviceLieutenant, United States Navyen_US
etd.thesisdegree.nameM.S. in Electrical Engineeringen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.disciplineElectrical Engineeringen_US
etd.thesisdegree.grantorNaval Postgraduate Schoolen_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record