Hybrid Evolutionary-Neural Network Approach in Generation of Artificial Accelerograms Using Principal Component Analysis and Wavelet-Packet Transform

A novel hybrid evolutionary neural network method to generate multiple spectrum-compatible artificial earthquake accelerograms (SCAEAs) is presented. Genetic algorithm is employed to optimize the weight values of networks. In order to improve the training efficiency, principal component analysis along with some other reduction techniques are used. The proposed evolutionary neural network develops an inverse mapping from compacted and reduced spectrum coefficients to the metamorphosed accelerogram's wavelet packet coefficients. As compared to the traditional methods, our algorithm is capable of generating an ensemble of dissimilar 10, 20, 30, and 40 s SCAEAs with better spectrum-compatibility and diversity, and proper computational efforts.