scholarly journals Validation of Two Nonlinear System Identification Techniques Using an Experimental Testbed

2004 ◽  
Vol 11 (3-4) ◽  
pp. 365-375 ◽  
Author(s):  
V. Lenaerts ◽  
G. Kerschen ◽  
J.-C. Golinval ◽  
M. Ruzzene ◽  
E. Giorcelli
Keyword(s):  
Experimental Data ◽  
Nonlinear System ◽  
Nonlinear System Identification ◽  
Physical Parameters ◽  
Free Response ◽  
Restoring Force ◽  
Surface Method ◽  
Experimental Testbed ◽  
Linear And Nonlinear ◽  
Identification Techniques

The identification of a nonlinear system is performed using experimental data and two different techniques, i.e. a method based on the Wavelet transform and the Restoring Force Surface method. Both techniques exploit the system free response and result in the estimation of linear and nonlinear physical parameters.

Linear and nonlinear system identification of autonomic heart-rate modulation

1997 ◽  
Vol 16 (5) ◽  
pp. 96-105 ◽  
Author(s):  
Ki.H. Chon ◽  
R. Mukkamala ◽  
K. Toska ◽  
T.J. Mullen ◽  
A.A. Armoundas ◽  
...  
Keyword(s):  
Heart Rate ◽  
System Identification ◽  
Nonlinear System ◽  
Nonlinear System Identification ◽  
Rate Modulation ◽  
Linear And Nonlinear

On the Non-Linear Characteristics of Automotive Shock Absorbers

1992 ◽  
Vol 206 (1) ◽  
pp. 3-16 ◽  
Author(s):  
C Surace ◽  
K Worden ◽  
G R Tomlinson
Keyword(s):  
Experimental Data ◽  
Restoring Force ◽  
Shock Absorbers ◽  
Surface Method ◽  
First Case ◽  
Non Linear ◽  
Realistic Representation ◽  
Linear System Identification ◽  
Stiffness Characteristics ◽  
Non Linear System

The objectives of this paper are essentially twofold. In the first case an experimental study of a number of shock absorbers is presented; the restoring force surface method of non-linear system identification is applied in order to determine the non-linear characteristics of the absorbers in an easily visualizable manner. In the second part, a new physical model for the absorber is presented which incorporates effects due to compressibility of the fluid in the absorber; this provides a more realistic representation of the stiffness characteristics than previous simple models. The new model is compared with the experimental data.

A Technique for Estimating Linear Parameters Using Nonlinear Restoring Force Extraction in the Absence of an Input Measurement

2005 ◽  
Vol 127 (5) ◽  
pp. 483-492 ◽  
Author(s):  
Muhammad Haroon ◽  
Douglas E. Adams ◽  
Yiu Wah Luk
Keyword(s):  
System Identification ◽  
Nonlinear System ◽  
Nonlinear System Identification ◽  
Restoring Force ◽  
Nonlinear Parameters ◽  
System Parameters ◽  
System Data ◽  
Vehicle Suspension System ◽  
Two Stages ◽  
Parameter Estimation Techniques

Conventional nonlinear system identification procedures estimate the system parameters in two stages. First, the nominally linear system parameters are estimated by exciting the system at an amplitude (usually low) where the behavior is nominally linear. Second, the nominally linear parameters are used to estimate the nonlinear parameters of the system at other arbitrary amplitudes. This approach is not suitable for many mechanical systems, which are not nominally linear over a broad frequency range for any operating amplitude. A method for nonlinear system identification, in the absence of an input measurement, is presented that uses information about the nonlinear elements of the system to estimate the underlying linear parameters. Restoring force, boundary perturbation, and direct parameter estimation techniques are combined to develop this approach. The approach is applied to experimental tire-vehicle suspension system data.

Investigation of Nonlinear Effects in a Bolted Joint Beam Using the Base Excitation

2020 ◽  
Author(s):  
Sushil Doranga
Keyword(s):  
Energy Levels ◽  
Nonlinear System Identification ◽  
Nonlinear Effects ◽  
Base Excitation ◽  
Restoring Force ◽  
Nonlinear Parameters ◽  
New Approach ◽  
Surface Method ◽  
Force Reconstruction ◽  
Modal Space

Abstract In this paper, the nonlinearity detection, characterization and identification of a bolted beam assembly is presented. The new approach based on the force reconstruction using the base excitation as an input is used for the identification of nonlinear parameters. The nonlinear effect in the bolted beam assembly was induced by reducing the bolt clamping loads. A collection of frequency response functions (FRFs) are shown at different clamping loads to detect and characterize the nonlinearities. Once the nonlinearities are detected and characterized, the restoring force surface method using the reconstructed force was used to identify the nonlinear parameters in the modal space. Four different base excitation (energy) levels with three different tightening torques were considered in the tests in order to study the energy dependence of the damping nonlinearities. In all the cases, the nonlinear system identification methodology employed was successful in identifying the damping and stiffness nonlinearities.

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