Can aliased modes of a flexible system be controlled by a digital controller of a low sampling rate

Bingen Yang*, Jwu-Sheng Hu

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

In digital control of flexible mechanical systems, aliasing in data sampling can cause instability in those aliased modes whose natural frequencies are higher than the Nyquist frequency. The sampling rate of a digital controller is usually limited by the hardware restrictions, and by the time needed to calculate the control inputs. Although some low-pass filters have been developed, they only make aliased modes uncontrollable, and do not guarantee stabilization of those modes. Motivated by the need for new techniques of handling aliased modes, this paper investigates stabilization and control of aliased modes of a flexible system via a digital controller of a low sampling rate. As a first attempt to develop fundamental theories on control of aliased modes, we will show that stabilization and control of aliased modes can be achieved even if they can not be identified from the sampled sensor outputs. A stability criterion for digital control of aliased modes will be derived. In addition, through a vibration analysis, the physical explanation for control of aliased modes will be provided.

Original languageEnglish
Title of host publicationSymposium on Mechatronics
EditorsJeffery L. Stein
PublisherPubl by ASME
Pages1-6
Number of pages6
ISBN (Print)0791810208
StatePublished - 1 Dec 1993
EventProceedings of the 1993 ASME Winter Annual Meeting - New Orleans, LA, USA
Duration: 28 Nov 19933 Dec 1993

Publication series

NameAmerican Society of Mechanical Engineers, Dynamic Systems and Control Division (Publication) DSC
Volume50

Conference

ConferenceProceedings of the 1993 ASME Winter Annual Meeting
CityNew Orleans, LA, USA
Period28/11/933/12/93

Fingerprint Dive into the research topics of 'Can aliased modes of a flexible system be controlled by a digital controller of a low sampling rate'. Together they form a unique fingerprint.

Cite this