Implementation of a modal filter on a five meter truss structureModal filtering is a spatial filtering technique which uses a weighted sum of a number of response measurements to extract the modal coordinates of the system from the physical response coordinates. No moving average or autoregressive calculations are required to implement the modal filter thus the modal coordinates may be calculated in real time. For practical implementation of the modal filter, the number and location of response locations must be chosen carefully. A modal filter is implemented on a five meter model space truss as a case study. The modal coordinates are extracted in real time using Hewlett Packard 3565 data acquisition and processig hardware. The effect of the number and location of response measurements on the performance of the modal filter is investigated. Applications of the modal filter to modal control and fast parameter identification are also discussed.
Document ID
19930045288
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Shelly, S. (NASA Langley Research Center Hampton, VA, United States)
Allemang, R. J. (NASA Langley Research Center Hampton, VA, United States)
Freudinger, L. (Cincinnati Univ. OH, United States)