Noise modeling of offshore platform using progressive normalized distance from worst-case error for optimal neuron numbers in deep belief network

Abstract

Noise prediction is important for crew comfort in an offshore platform such as oil drilling rig. A deep neural network learning on the oil drilling rig is not widely studied. In this paper, a deep belief network (DBN) with the last layer initialized with trained DBN (named DBN-DNN) is used to model the sound pressure level (SPL) in the compartments of the oil drilling rig. The method finds an optimal number of the hidden neurons in restricted Boltzmann machine by using a normalized Euclidean distance from the worst possible error for each hidden layer progressively. The dataset used for experimental results is obtained via vibroacoustics simulation software such as VA-One and actual site measurements. The results show that output parameters such as spatial SPL, average spatial SPL, structure-borne SPL and airborne SPL improve the testing root mean square error to around 20% as compared to randomly assigning the number of neurons for each hidden layer. The testing RMSE in the output parameters has improved when compared with a multi-layer perceptron, sparse autoencoder, Softmax, self-taught learning and extreme learning machine. Keywords Deep learning • Noise prediction • Marine and offshore industry • Sound pressure level • Structure-borne noise • Airborne noise Communicated by V. Loia.

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“…The number of neurons in the hidden layer can determine the convergence of the training function, the length of training, and the size of training error, which is very important for the effect of model fitting. Many scholars have conducted a lot of research on the selection of the number of neurons in the hidden layer (Adil et al, 2020;Chin and Zhang, 2021;Karmakar and Goswami, 2021). Dong et al (2018) believe that the number of neurons in the hidden layer is optimal when m is (2a + 1), which can also be selected according to Eq.…”