Francisco javier gil chica

• University of Alicante

We derive a new equation of state (EOS) for any non-polar, polar or quantum gas and any intermolecular potential through an approximation of the radial distribution function based on the Ornstein-Zernike equation. Such EOS is applied to estimate the virial coefficients B and C using two approaches. On one hand, B and C are directly computed from th...

This paper analyzes how to determine the virial coefficients B and C of real gases by using a theoretical device whose pressures and densities oscillate in chaotic regime. The device is formed by a valve, a pressure controller, a pressure probe and a gas accumulator, for which the thermodynamic model has been derived from the force-mass-energy bala...

This paper investigates several cubic and non-cubic state equations of real gases at high pressures by using the virial coefficients estimated from chaotic oscillations with a mechanical-thermal device. The mechanical part is formed by a cylinder with a piston whose motion is limited by means of a nonlinear spring, a damper and a nonlinear control...

This paper analyzes the behavior of nitrogen inside a closed cylinder with a mobile piston actuated by a nonlinear spring, a viscous damper and a control force which compensates partially the effect of the high gas pressure. Two helical heating coils are placed inside the cylinder and with their flow rates controlled by means of a linear controller...

This paper studies the stabilization, tracking of a predefined trajectory and how to reach a desired set point for a wheel which is rolling on a horizontal plane without slipping. For this purpose, the wheel is controlled by small torque generated by internal servomechanisms whose dynamics can be neglected. An efficient procedure to determine the k...

Palabras clave: Servomecanismo, no linealidad cúbica, ajuste regulador PID, bifurcación de Bogdanov-Takens, función descriptiva, caos

Palabras clave: Servomecanismo, no linealidad cúbica, ajuste regulador PID, bifurcación de Bogdanov-Takens, función descriptiva, caos

Resumen Se presenta un procedimiento para establecer la condición no holónoma de rodadura e incorporar a la lagrangiana como coordenadas generalizadas las del punto de contacto. El procedimiento es pura-mente geométrico y evita el concepto de velocidad angular Palabras clave: Rodadura, no holonomía.

En este trabajo se estudia el movimiento horizontal de una masa sometida a una fuerza horizontal variable de la que cuelga un péndulo formado por un cable inextensible y de masa despreciable unido a una gran masa. El modelo matemático del sistema se obtiene de las ecuaciones de Newton, y a partir de él se demuestra que cuando no hay fuerza horizont...

In this paper we investigate the stability and the onset of chaotic oscillations around the pointing-up position for a simple inverted pendulum that is driven by a control torque and is harmonically excited in the vertical and horizontal directions. The driven control torque is defined as a proportional plus integral plus derivative (PID) control o...

We re-derive a general procedure to substitute any rigid body by an equivalent system of exactly four masses, located at the vertices of an irregular tetrahedron.

On the basis of Bogdanov–Takens bifurcation, we obtain two nonlinear control laws for stabilization and positioning of a rolling disk on a horizontal plane at a desired set point. The first control law is applied to reach a set of predetermined points from previously calculated initial conditions, which unavoidably implies a small position error. T...

This paper explores the problem of swinging-up an inverted pendulum formed by a rod attached to a wheeled cart with a hanging bob at its opposite end. The system is driven by the wheeled cart platform system, which is formed by a cart, wheels with counterbalance and connecting-rods. The model of the system is initially obtained under the assumption...

This paper concerns to the self-oscillation and chaotic motions of two coupled nano-masses connected to a hard nonlinear spring with viscous damping. The system is actuated by two external control forces to drive the masses to prescribed set points following a dynamical behavior named as regular. By means of appropriate control forces and an extern...

This paper explores chaotic behaviour and control of micro-electro-mechanical systems (MEMS), which consist of thousands of small read/write probe tips that access gigabytes of data stored in a non-volatile magnetic surface. The model of the system is formed by two masses connected by a nonlinear spring and a viscous damping. The paper shows that,...

Resumen En este trabajo se presenta el desarrollo del modelo matemático y el sistema de control de un evaporador de doble efecto utilizado para concentrar mezclas de trietilen-glicol en agua. A partir de los balances de materia y energía se obtiene el modelo no lineal del proceso, formado por cinco variables de estado tres entradas de control y tre...

Resumen Los reactores continuos tipo tanque agitados (RTCA), pueden considerarse como sistemas emblemáticos desde el punto de vista del modelado y control. Esto es debido a las no linealidades asociadas al modelo, cuando opera en régimen de auto-regulación o con algún tipo de control añadido. En este trabajo, se estudian distintos tipos de fenómeno...

posición y con un sistema de control de temperatura con retardo. Palabras clave: Control digital, respuesta en frecuencia, diagramas de Bode, filtro de avance y retado, servomecanismo, regulación de temperatura.

Resumen La llegada de los nuevos planes de estudio va a suponer un cambio de contenidos de muchas materias en los nuevos niveles de grado, postgrado y master. Por otro lado, sería deseable que tales cambios no implicaran renunciar a nuevos contenidos que se han ido incorporando a la Ingeniería de Sistemas y Control en los últimos30 años. Desde este...

que la limitación de los pares de control, junto con unos determinados valores de las constantes de los reguladores PID, pueden dar lugar a un comportamiento caótico del manipulador. Palabras clave: Manipulador, subactuado, trayectoria, control no lineal, dinámica interna, caos 1 INTRODUCCION Es bien conocido [1] que las técnicas de control lineal...