A modal analysis view of minimum phase response of acoustic enclosures

2015 ◽  
Vol 138 (3) ◽  
pp. 1828-1828
Author(s):  
Sahar Hashemgeloogerdi ◽  
Mark F. Bocko
Keyword(s):  
Modal Analysis ◽  
Phase Response ◽  
Minimum Phase ◽  
Acoustic Enclosures

Dynamics and Trajectory Tracking Control of a Two-Link Robot Manipulator

2004 ◽  
Vol 10 (10) ◽  
pp. 1415-1440 ◽  
Author(s):  
Anthony Green ◽  
Jurek Z. Sasiadek
Keyword(s):  
Fuzzy Logic ◽  
Time Delay ◽  
Inverse Dynamics ◽  
Position Control ◽  
Robot Manipulator ◽  
Phase Response ◽  
Control Law ◽  
Minimum Phase ◽  
Linear Quadratic ◽  
Trajectory Tracking Control

Operational problems with robot manipulators in space relate to several factors, most importantly, structural flexibility and subsequent difficulties with their position control. In this paper we present control methods for endpoint tracking of a 12.6 × 12.6m2 trajectory by a two-link robot manipulator. Initially, a manipulator with rigid links is modeled using inverse dynamics, a linear quadratic regulator and fuzzy logic schemes actuated by a Jacobian transpose control law computed using dominant cantilever and pinned-pinned assumed mode frequencies. The inverse dynamics model is pursued further to study a manipulator with flexible links where nonlinear rigid-link dynamics are coupled with dominant assumed modes for cantilever and pinned-pinned beams. A time delay in the feedback control loop represents elastic wave travel time along the links to generate non-minimum phase response. A time delay acting on control commands ameliorates non-minimum phase response. Finally, a fuzzy logic system outputs a variable to adapt the control law in response to elastic deformation inputs. Results show greater endpoint position control accuracy using a flexible inverse dynamics robot model combined with a fuzzy logic adapted control law and time delays than could be obtained for the rigid dynamics models.

Modal analysis of acoustic enclosures by dual reciprocity–boundary element method.

2010 ◽  
Vol 128 (4) ◽  
pp. 2339-2339
Author(s):  
Helvio P. Mollinedo ◽  
Hector V. Merodio ◽  
Itzala M. Rabadan ◽  
Jose Angel H. Ortega
Keyword(s):  
Boundary Element Method ◽  
Modal Analysis ◽  
Boundary Element ◽  
Acoustic Enclosures ◽  
Element Method

Determination of the seismograph phase response from the amplitude response

1972 ◽  
Vol 62 (6) ◽  
pp. 1665-1672 ◽  
Author(s):  
P. M. Bolduc ◽  
R. M. Ellis ◽  
R. D. Russell
Keyword(s):  
Hilbert Transform ◽  
Rapid Determination ◽  
Phase Response ◽  
Minimum Phase ◽  
Amplitude Response ◽  
Amplitude Data ◽  
The Hilbert Transform ◽  
Seismic System

abstract Determination of the phase response of a minimum-phase seismic system directly from the amplitude response by the Hilbert transform is investigated. The error by this technique is found to be less than 2° with the major source of inaccuracy being the uncertainties in the amplitude data. This technique is useful for rapid determination of the phase response if the amplitude response is known.

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