3 edition of **Parameter estimation in a structural acoustic system with fully nonlinear coupling conditions** found in the catalog.

Parameter estimation in a structural acoustic system with fully nonlinear coupling conditions

H. Thomas Banks

- 353 Want to read
- 36 Currently reading

Published
**1994**
by Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, National Technical Information Service, distributor in Hampton, Va, [Springfield, Va
.

Written in English

**Edition Notes**

Statement | H.T. Banks, R.C. Smith. |

Series | NASA contractor report -- 194926., ICASE report -- no. 94-41., NASA contractor report -- NASA CR-194926., ICASE report -- no. 94-41. |

Contributions | Smith, R. C., Institute for Computer Applications in Science and Engineering. |

The Physical Object | |
---|---|

Format | Microform |

Pagination | 1 v. |

ID Numbers | |

Open Library | OL14667661M |

The effect of structural-acoustic coupling on the active co ntrol of noise in vehicles Jordan Cheer 1, Stephen J. Elliott 1 1 Institute of Sound and Vibration Research, University of So uthampton,SouthamptonSO17 1BJ, United Kingdom email: @,[email protected] Dynamics of Coupled Structures, Volume 4: Proceedings of the 35 th IMAC, A Conference and Exposition on Structural Dynamics, , the fourth volume of ten from the Conference brings together contributions to this important area of research and engineering. The collection presents early findings and case studies on fundamental and applied aspects of the Dynamics of Coupled Structures.

This work discusses adaptive iterative coupling strategies for the frequency domain analysis of interacting acoustic-elastodynamic models. The method of fundamental solutions (MFS) is used to analyze acoustic fluids, whereas the finite element method (FEM) is employed to discretize elastodynamic solids. Flexible and optimized iterative MFS-FEM coupling procedures are . acoustic properties (e.g. sound velocity, attenuation) change by no more than 1%. Literature indicates however that nonlinear acoustical properties change by roughly 50% [1]. From this evidence it appears a nonlinear acoustic technique would be an additional method to examine microstructural changes in precipitation hardened materials.

CSC - Chinese Scholarship Council, Modal parameter estimation of linear time-varying systems Science Without Borders Brazil, Non-modal acceleration methods for acoustic-structural simulations Science Without Borders Brazil, High-order discontinuous Galerkin methods for computational aeroacoustics applications. system of equations, when solving structure-acoustic systems is likely to become very large. The geometriccomplexityof the systemsunderstudyand the frequencylimit of interest determine the size of the system. The constant aim to have a more detailed description of the geometry and an increased frequency limit of validity for the model.

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Parameter estimation in a structural acoustic system with fully nonlinear coupling conditions (96) Parameter Estimation in a Structural Acoustic System with Fully Nonlinear Coupling Conditions* H.

BANKS Center for Research in Scientific Computation North Carolina State University, Raleigh, NCU.S.A. SMITH Department Cited by: Parameter estimation in a structural acoustic system with fully nonlinear coupling conditions ☆ Author links open overlay panel H.T.

Banks R.C. Smith Show moreCited by: Title: Parameter estimation in a structural acoustic system with fully nonlinear coupling conditions: Author: Banks, Harvey Thomas; Smith, Ralph C.: Publisher: North Carolina State by: Parameter estimation in a structural acoustic system with fully nonlinear coupling conditions Author: H Thomas Banks ; R C Smith ; Institute for Computer Applications in Science and Engineering.

Moreover, the model is weakly nonlinear as a result of the coupling mechanism between the structural vibrations and the interior acoustic dynamics.

Within this context, an illustrating model is given, well-posedness and approximation results are discussed and an applicable parameter estimation methodology is presented. Parameter Estimation In A Structural Acoustic System With Fully Nonlinear Coupling Conditions.

By H. Banks and R. Smith. Abstract. A methodology for estimating physical parameters in a class of structural acoustic systems is presented. The general model under consideration consists of an interior cavity which is separated from an.

PARAMETER ESTIMATION IN A STRUCTURAL ACOUSTIC SYSTEM WITH FULLY NONLINEAR COUPLING CONDITIONS DTIC ELECTE JUL 2 7 H. Banks S R. Smith G Contract NAS May 97 2 5 Institute for Computer Applications in Science and Engineering NASA Langley Research Center Hampton, VA Parameter estimation in a structural acoustic system with fully nonlinear coupling conditions.

By H. Banks and Ralph C. Smith. Abstract. A methodology for estimating physical parameters in a class of structural acoustic systems is presented. The general model under consideration consists of an interior cavity which is separated from an.

parameter estimation scheme in the nonlinear problem. In discussing parameter estimation methods for structural acoustics problems of this type, our emphasis is on the formulation of the problem in a manner which is conducive to approximation and implementation both in the linear and nonlinear forms as well as under a variety of damping assumptions.

The quantification and utilization of coupling effects in a prototypical structural acoustic system are examined in this paper.

In typical systems, the coupling mechanisms are manifested in two ways. The first leads to the transfer of energy from an ambient field to an adjacent structure and is often responsible for exogenous structural excitation.

The second involves the transfer of energy. Algorithms have been developed which allow estimation of the state and parameters of these systems to be done with reasonable accuracy. These algorithms, which center around a set of extended Kalman filters and optimization techniques such as Newton-Raphson and the Chow-Yorke homotopy method, are far more complex computationally than those used.

Parameter estimation in a structural acoustic system with fully nonlinear coupling conditions [microform Parameter estimation problems for distributed systems using a multiigrid method [microform] / Shlomo Ta' Geometry and identification: proceedings of APSM Workshop on System Geometry, System Identification, an A PDE-based.

H.T. Banks and R.C. Smith, “Parameter Estimation in a Structural Acoustic System with Fully Nonlinear Coupling Conditions,” Inverse Problems, submitted. Google Scholar [15]. A major problem of ﬂuid dynamics is that the equations of motion are non-linear.

This implies that an exact general solution of these equations is not available. Acoustics is a ﬁrst order approximation in which non-linear effects are neglected. In classical acoustics the generation of sound is considered to be a boundary condition problem.

() An online coupled state/input/parameter estimation approach for structural dynamics. Computer Methods in Applied Mechanics and Engineering() Computational vademecums for the real-time simulation of haptic collision between nonlinear solids. In equation, the nonlinearity of the structural-acoustic system is represented by the term.

Physically, the nonlinearity is caused by the large amplitude vibration. “Parameter estimation in a structural acoustic system with fully nonlinear coupling conditions,” Mathematical and.

Abstract: Three passive acoustic data processing applications using a non-linear least squares (NLS) approach are reviewed for parameter estimation of a variety of aero-acoustic emitters and observables: (i) flight motion parameter estimation of a turboprop aircraft using a sequence of instantaneous frequency measurements from a single microphone, (ii) flight motion parameter estimation of a.

A modal formulation is employed to solve for the interior acoustic response, and an analysis is developed to identify the structural and acoustic modal participation as well as the boundary panel participation in producing the response.

As an example application, a coupled model of an automotive vehicle is presented and experimentally evaluated. The mode-based steady-state dynamic procedure is the most computationally efficient alternative to compute the steady-state response of structural-acoustic systems.

Structural-acoustic coupling and damping effects in these analyses depend on the type of modal procedure and the eigensolver that was used to compute the eigenfrequencies. System identification can be a nice tool to make an accurate model of structural acoustic system that can describe the structure-borne noise in a car or an airplane.

where u tt is the structural acceleration, nis the surface normal, p t is the total acoustic pressure, q d is the acoustic dipole domain source (if applicable), and F A is the load (force per unit area) experienced by the structure.

The Acoustic-Structure Boundary coupling can be used to couple a pressure acoustics model to any structural component. This includes the acoustics interfaces.parameter estimation in a structural acoustic system with fully nonlinear coupling conditions h.t.

banks and r.c. smith may, crsc-tr an h-infinity/minmax periodic control in a 2-d structural acoustic model with piezoceramic actuators h.t.

banks, m.a. demetriou, and r.c.The modified structural modal base is then used together with an uncoupled acoustic modal base to derive the fully coupled vibro-acoustic finite element model, which is reduced and formulated as a state-space model.

The electro-mechanical coupling between the structure and the sensor/actuator pair is calculated and included in the state-space.