Sensor and actuator placement for modal identification

Y. T. Shih, An-Chen Lee, J. H. Chen

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


In modal identification, the use of different actuator and sensor locations results in different frequency response functions (FRFs) and consequently affects the modes shown on the FRF plots. This paper presents a method of placing sensors and actuators to obtain reliable measured data for estimating the modal parameters. The method is based on proposed controllability and observability measures for second-order linear systems, which are suitable for identification purposes and have a physical interpretation on the FRF plots. These measures, combined with an objective criterion, provide a method for ranking the effectiveness of alternative actuator and sensor distributions and hence a rational basis for choosing their locations. The method is applied successfully to the selection of actuator and sensor locations for a set of target modes for the structural characterisation of a simulated system. Finally, an iterative procedure for performing modal surveys is proposed.

Original languageEnglish
Pages (from-to)641-659
Number of pages19
JournalMechanical Systems and Signal Processing
Issue number5
StatePublished - 1 Jan 1998

Fingerprint Dive into the research topics of 'Sensor and actuator placement for modal identification'. Together they form a unique fingerprint.

Cite this