High performance PI(D) controller on ship steering with a conditional reset windup

In this work it is described some practical aspects of PI(D) controllers regarding to conditional integration as an alternative to classical reset windup. This contribution concerns to the integral action, which is managed as function of control error sign. The effect due to the action of reset to zero or clear integral action when sign error changes, is a drastic reduction in response overshoot to command inputs for a special type of common industrial control systems among which, are ship steering control. Such strategy take advantages over conventional reset windup of PI(D) controllers in some applications such as feedback control of second order processes with at least, one of the dominant roots located at the origin of complex plan

Evaluation and control of marine vessels stability in waves

[Abstract] This paper presents the research results achieved by means of the preliminary design study and implementation of a Pc-based Expert System for Safely Navigation. PESSN. It consists in an advisory system related to the stability and motion of the vessels in waves, where environmental information and marine vehicle conditions are acquired by a set of sensors. A proper real time corrective action is taken by means of PESS

Contribution to real time stability monitoring in waves based in FFT algorithm

[Abstract] This paper describes a methodology to implement and operate an automatic onboard device destined to compute ship stability in real time. The system comprises a software based set of instruments linked to a PC computer which measure roll motions in waves and process acquired data supplying a value related with ship stability by means of an algorithm based in the frequency domain analysis of ships motions related with sea state parameter

Contrastes de especificación para modelos de distribución

Traballo Fin de Grao en Matemáticas. Curso 2018-2019[ES] Este trabajo trata de revisar los fundamentos matemáticos sobre los que se apoyan las tres familias más importantes de contrastes de especificación para una muestra dada: la basada en la estimación de una multinomial, la que se sustenta en la función de distribución empírica y la que utiliza el estimador de densidad kernel; así como de recopilar los estad ísticos de mayor importancia que han surgido en cada una de ellas y que dan lugar a los distintos test de uso actual. También se exponen las diferentes pautas para los métodos de contraste, las cuales han sido establecidas por diversos autores tras estudios tanto teóricos como por simulación. Finalmente, se ilustran los test propuestos utilizando bases de datos simuladas para el caso de una hipótesis simple y compuesta.[EN] In this dissertation we aim to review the mathematical fundamentals that conform the three main families of goodness-of-fit tests: the one which relies on the estimation of a multinomial distribucition from the sample, the one which is based on the empirical cumulative distribution function and that which employs the kernel density estimation function. We introduce the main statistics and which originate from each perspective, and we give the most important criteria that need to be followed when implementing the different methods according to the suggestions of several authors. Eventually, we ilustrate the tests applying them to simulated samples for both the case of the simple and the composite null hypothesis

Nicanor Bolet Pereza en "La Revista Ilustrada de Nueva York" (1885-1890)

This paper examines the trajectory of Nicanor Bolet Peraza in his role of exile writer and editor of the journal "La Revista Ilustrada" de Nueva York during the years of 1885-1890. By examining some of Bolet Peraza’s editorials and articles published in this magazine, and the repercussions they had on other Latin American publications, this paper shows the commitment this Venezuelan writer had with Hispanic independent movements. In his role of managing editor, Bolet Peraza helped other intellectual exiles and political refugees from any part of the Hispanic speaking world to settle within the United States and to disseminate their literary work.Este trabajo examina la trayectoria de Nicanor Bolet Peraza como escritor exiliado y editor de "La Revista Ilustrada de Nueva York" durante el período comprendido entre 1885 y 1890. A través del examen de algunos de los editoriales y crónicas publicados por Bolet Peraza en la revista, este artículo demuestra el compromiso del escritor venezolano con los diferentes movimientos independentistas de Hispanoamérica; quien, en su rol de editor jefe, ayudó a otros intelectuales exiliados y refugiados políticos de Hispanoamérica a asentarse en los Estados Unidos y, al mismo tiempo, difundir su obra literaria

Norteamérica vista desde Europa

Gráfico de acontecimientos políticos mundiales de 194