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Abstract

The term roughness is used to describe a specific sound sensation which may occur when listening to stimuli with more than one spectral component within the same critical band. It is believed that the spectral components interact inside the cochlea, which leads to fluctuations in the neural signal and, in turn, to a sensation of roughness. This study presents a roughness model composed of two successive stages: peripheral and central. The peripheral stage models the function of the peripheral ear. The central stage predicts roughness from the temporal envelope of the signal processed by the peripheral stage. The roughness model was shown to account for the perceived roughness of various types of acoustic stimuli, including the stimuli with temporal envelopes that are not sinusoidal. It thus accounted for effects of the phase and the shape of the temporal envelope on roughness. The model performance was poor for unmodulated bandpass noise stimuli.
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Abstract

In order to meet global challenges, cities must be governed efficiently, be compact, and as a result more sustainable, socially coherent, strong and competitive at economic level. Initiatives taken in favour of urban mobility may help in shaping of the global society, putting the main focus on the quality of life, citizens› needs and the principle of sustainable development. These actions aim at focusing citizens› attention on the need to improve air quality, decrease congestion in city’s main streets, but most of all to invest in your own health and physical condition, which increases the level of citizens’ life conditions, and in turn provides the city with considerable economic benefits. However, is it quite a challenge to ensure a sustainable urban mobility pattern which requires a high level of stakeholders’ participation and establishing a detailed complex planning process. The aim of the paper is to present, based on the available literature and data sources and also survey research results, shaping life quality in the aspect of mobility in the context of current megatrends, taking as a case study the CIVITAS DYN@MO project implementation in the city of Gdynia.
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Abstract

This work presents the co-simulation approach to the analysis of control systems containing detailed models of electromagnetic and electromechanical converters. In this method of analysis the attention is paid to the whole system and not only to its electromagnetic part. The latter is described by equations resulted from the two-dimensional finite element discretisation of the Maxwell equations, and is coupled weakly with the remaining part of the system. The simulation is carried out in Matlab/Simulink environment wherein the coupling is realised through the S-function. Example results regarding simulation of the operation of the control system of an electrical machine and the operation of a power electronic converter are presented and compared with available reference data.
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