Determination of relaxation modulus of time-dependent materials using neural networks
Health monitoring systems for plastic based structures require the capability of real time tracking of changes in response to the time-dependent behavior of polymer based structures. The paper proposes artificial neural networks as a tool of solving inverse problem appearing within time-dependent material characterization, since the conventional methods are computationally demanding and cannot operate in the real time mode. Abilities of a Multilayer Perceptron (MLP) and a Radial Basis Function Neural Network (RBFN) to solve ill-posed inverse problems on an example of determination of a time-dependent relaxation modulus curve segment from constant strain rate tensile test data are investigated. The required modeling data composed of strain rate, tensile and related relaxation modulus were generated using existing closed-form solution. Several neural networks topologies were tested with respect to the structure of input data, and their performance was compared to an exponential fitting technique. Selected optimal topologies of MLP and RBFN were tested for generalization and robustness on noisy data; performance of all the modeling methods with respect to the number of data points in the input vector was analyzed as well. It was shown that MLP and RBFN are capable of solving inverse problems related to the determination of a time dependent relaxation modulus curve segment. Particular topologies demonstrate good generalization and robustness capabilities, where the topology of RBFN with data provided in parallel proved to be superior compared to other methods.
2017
2018-12-24 09:05:01
1033
relaxation modulus, inverse problem, neural networks, multilayer perceptron, radial basis function neural network, structural health monitoring
relaksacijski moduli, nevronske mreže, večplastni perceptron, monitoring stanja stuktur
dk_c
Alexandra
Aulova
70
Edvard
Govekar
70
Igor
Emri
70
UDK
4
681.5(045)
ISSN pri članku
9
1385-2000
DOI
15
10.1007/s11043-016-9332-x
COBISS_ID
3
15013147
OceCobissID
13
3749403
RAZ_Aulova_Alexandra_i2017.pdf
635482
Predstavitvena datoteka
2018-12-24 09:15:26
0
Izvorni URL
2018-12-24 09:05:07