Analysis of nonlinear autonomous systems has been a popular field of study in recent decades. As an interesting nonlinear behavior, chaotic dynamics has been intensively investigated since Lorenz discovered the first physical evidence of chaos in his famous equations. Although many chaotic systems have been ever reported in the literature, a systematic and qualitative approach for chaos generat...

INTRODUCTION As shown by McGeer (1990), the passive dynamics of the legs are sufficient to walk down a gentle slope with no external control, and no external energy input save from gravity. Here we consider different models based on passive dynamics, including actively powered models that still make use of passive dynamic principles. We consider the stability of these models, and the implicatio...

For the modeling and simulation of large water recovery and irrigation systems, standard component models as found in simulation tool libraries are too complex. In this work, simple models are derived and applied for the modeling and simulation of a real system. In this system, water for irrigation will be collected by recovery wells around the wastewater treatment plant infiltration basins loc...

This paper presents a simplified generator model for use in dynamic studies of electric power systems. The proposed model captures important characteristics of generators that include voltage and frequency variation as well as excitation limits. The behavior of the model is compared to that of a well-accepted higher order model through application to an example two-bus power system. Examination...

Access to power is tied to a country’s development. It facilitates improved social welfare, education, health and income generating opportunities. Uganda’s economy is stifled by its low electrification rates 16% nationally. This study builds a working theory on the internal setup of Uganda’s power sector utilizing this theory to surface influential behavior modes as they pertain to power genera...

Every year the number of installed wind power plants in the world increases. The horizontal axis wind turbine is the most common type of turbine but there exist other types. Here, three different wind turbines are considered; the horizontal axis wind turbine and two different concepts of vertical axis wind turbines; the Darrieus turbine and the H-rotor. This paper aims at making a comparative s...