Observability and Confidence of Stability and Control Derivatives Determined in Real Time

Stability and control derivatives of an aircraft were estimated from real flight test data in real time. A higher language block diagram library was developed for this purpose. Parameter identification techniques and requirements were used to detect and rate maneuvers present in the data. These ratings were used to blend newly calculated derivatives with previously known values by means of a Kalman filter. The Kalman filter output was used to identify the health of control surfaces actuators. Statistical and measured data were used to predict the probability that an actuator failure has occurred at any given time during the flight. Sweeps of all the tuning parameters of the system were performed, and it was demonstrated that these tuning parameters can be used to obtain the desired performance based on requirements

Safety Assurance of Non-Deterministic Flight Controllers in Aircraft Applications

Loss of control is a serious problem in aviation that primarily affects General Aviation. Technological advancements can help mitigate the problem, but the FAA certification process makes certain solutions economically unfeasible. This investigation presents the design of a generic adaptive autopilot that could potentially lead to a single certification for use in several makes and models of aircraft. The autopilot consists of a conventional controller connected in series with a robust direct adaptive model reference controller. In this architecture, the conventional controller is tuned once to provide outer-loop guidance and navigation to a reference model. The adaptive controller makes unknown aircraft behave like the reference model, allowing the conventional controller to successfully provide navigation without the need for retuning. A strong theoretical foundation is presented as an argument for the safety and stability of the controller. The stability proof of direct adaptive controllers require that the plant being controlled has no unstable transmission zeros and has a nonzero high frequency gain. Because most conventional aircraft do not readily meet these requirements, a process known as sensor blending was used. Sensor blending consists of using a linear combination of the plant’s outputs that has no unstable transmission zeros and has a nonzero high frequency gain to drive the adaptive controller. Although this method does not present a problem for regulators, it can lead to a steady state error in tracking applications. The sensor blending theory was expanded to take advantage of the system’s dynamics to allow for zero steady state error tracking. This method does not need knowledge of the specific system’s dynamics, but instead uses the structure of the A and B matrices to perform the blending for the general case. The generic adaptive autopilot was tested in two high-fidelity nonlinear simulators of two typical General Aviation aircraft. The results show that the autopilot was able to adapt appropriately to the different aircraft and was able to perform three-dimensional navigation and an ILS approach, without any modification to the controller. The autopilot was tested in moderate atmospheric turbulence, using consumer-grade sensors and actuators currently available in General Aviation aircraft. The generic adaptive autopilot was shown to be robust to atmospheric turbulence and sensor and actuator random noise. In both aircraft simulators, the autopilot adapted successfully to changes in airspeed, altitude, and configuration. This investigation proves the feasibility of a generic autopilot using direct adaptive controller. The autopilot does not need a priori information of the specific aircraft’s dynamics to maintain its safety and stability arguments. Real-time parameter estimation of the aircraft dynamics are not needed. Recommendations for future work are provided

Sistema para el control de aforo seguro en establecimientos.

Trabajo de Fin de Grado. Grado en Ingeniería Informática. Curso académico 2020-2021.[ES]Sistema diseñado para establecimientos capaz de controlar el aforo de clientes y de reconocer el uso de mascarillas. Ofrece un portal donde los usuarios pueden acceder y gestionar la información relacionada con sus edificios. Los usuarios no registrados podrán ver el estado del aforo de los establecimientos. Además, en las puertas de entrada se muestra en una pantalla el estado del establecimiento en tiempo real[EN]System designed for establishments capable of controlling customer capacity and recognizing the use of facemasks. Provides a portal where users can access and manage information related to their buildings. Unregistered users will be able to view the capacity status of the facility. In addition, the status of the facility is displayed on a screen at the entrance doors in real tim

Diseño de parche bifrecuencia alimentado por ranura

El proyecto realizado analiza el funcionamiento de una antena de parche rectangular alimentada mediante la técnica de acoplo por ranura. Esta antena tiene la particularidad de que funciona a dos frecuencias de forma independiente, las frecuencias de trabajo son 1,9 GHz y 2,4 GHz. Esto permitiría desde un único dispositivo controlar dos sistemas de comunicación que estén funcionando en bandas distintas y de manera independiente. La antena utilizada se compone de un parche metálico ajustado en tamaño para obtener las frecuencias de trabajo que nos hemos planteado y dos línea de alimentación microstrip situadas en un plano inferior que acoplan la energía al parche a través de dos ranuras. Dichas líneas excitan los dos modos ortogonales del parche rectangular. Se ha analizado la influencia sobre la adaptación del dispositivo, del desplazamiento de las ranuras a lo largo de toda la superficie del parche. Esto servirá de referencia, para a lo largo del diseño ir desarrollando la antena de acuerdo con ese análisis. El proyecto incluye también modelos con distintos grosores de sustrato y distintos tipos de dieléctrico. Por último se ha realizado un estudio de filtros utilizando materiales de banda prohibida electromagnética o EBG. Estos filtros van a consistir en una serie de resonadores colocados a lo largo de la línea de transmisión y cortocircuitados con vías al plano de masa. Una vez realizado el estudio se van a incluir en el diseño de la antena para comprobar su funcionamiento en la antena propuesta, con el propósito de aumentar el aislamiento entre los puertos.Ingeniería Técnica en Sistemas de Telecomunicació

Windows through the Dusty Disks Surrounding the Youngest Low Mass Protostellar Objects

The formation and evolution of young low mass stars are characterized by important processes of mass loss and accretion ocurring in the innermost regions of their placentary circumstellar disks. Because of the large obscuration of these disks at optical and infrared wavelengths in the early protostellar stages (Class 0 Sources), they were previously detected only at radio wavelengths using interferometric techniques. We have detected with the Infrared Space Observatory (ISO) the mid-infrared emission associated with the Class 0 protostar VLA1 in the HH1-2 region located in the Orion nebula. The emission arises in the three wavelength windows at 5.3, 6.6 and 7.5 micras where the absorption due to ices and silicates has a local minimum that exposes the central parts of the youngest protostellar systems to mid-infrared investigations. The mid-infrared emission arises from a central source with 4 AU diameter at an averaged temperature of 700 K, deeply embedded in a dense region with a visual extinction of Av=80-100mag.Comment: The article is here and on pres

La batalla por el teatro: La creación colectiva en el campo del teatro limeño (1971-1990)

El presente trabajo aborda el fenómeno de la creación colectiva en el campo del teatro limeño entre los años 1971 y 1990 con la intención de explorar las respuestas del sector del teatro de autor y sopesar en qué medida la irrupción de este nuevo modo de producción y creación tranformó el campo. Para analizar el fenómeno estético, se revisan el concepto de teatro posdramático sostenido por Hans Thies Lehmann, el de estética performativa trabajado por Erika Fischer-Lichte, las herramientas de análisis de la puesta en escena propuestas por Patrice Pavis, así como las diveras confluencias de las que deriva la creación colectiva en nuestro teatro como son las ideas de Artaud, Brecht, Grotowski, Barba, Buenaventura, Boal y otros creadores latinoamericanos. Para analizar el fenómeno en su aspecto sociológico, me sirvo de las ideas construidas por Pierre Bourdieu para abordar el campo de la creación artística. El material de estudio es el producido por creadores y críticos limeños entre 1971 y 1998 y está constituido por artículos, críticas, reseñas periodísticas, testimonios así como por los registros de las obras de creación colectiva. En algunos casos se ha complementado con entrevistas y testimonios a los creadores. También me sirvo de mi experiencia como creador y testigo en el campo en esos años. Se trata pues de revisitar las ideas respecto al teatro peruano que entraron en conflicto entonces para tratar de ofrecer una lectura más completa de un fenómeno muy poco estudiado y sin embargo fundante para el campo del teatro peruano contemporáneo.Tesi

Optimal discrete-time Prony series fitting method for viscoelastic materials

The most important characteristics of the behaviour of viscoelastic materials are the time and temperature dependence of their properties. Viscoelastic models based on Prony series are usually used due to easy implementation in finite element analysis (FEA) codes. The experimental data are fitted to a Prony series using a user-convenience number of terms represented by two coefficients. The time coefficients τ are previously fixed in the time scale in order to determine the second parameters of the model. Usually, an homogeneous distribution in logarithmic-time scale is used for τ, which produces accurate fittings when a large number of terms in the Prony series are used as well as when the material presents a uniform sigmoidal viscoelastic curve along several decades of time. When short-time curves must be fitted or the relaxation curve shape is not so uniform distributed along time, the homogeneous distribution of time coefficients could be a significant drawback since a large number of coefficients could be needed or even a reasonable fitting with a Prony series model is not possible. In this study, an optimized τi distributed method for fitting master curves of viscoelastic materials based on Prony series model is proposed. The method is based on an optimization algorithm strategy to allocate the time coefficients along the time scale in order to obtain the best fit. The method is validated by using experimental data of temporomandibular joint (TMJ) disc, which is a biological material that presents a short-time and high relaxation rate viscoelastic curve. The results show that the method improves significantly the fitting of the viscoelastic curves when compared with uniform distributed time fittings. Furthermore, the optimized coefficients are also used to obtain the complex moduli of the material using an analytical conversion, which is compared with the experimental complex moduli curves of the material

mWater prototype #3 analysis and design

In themWater case study prototype #3 it has been used Magentix2 [1, 24, 3, 22, 4, 17] (for more details on Magentix2 see WP7 Deliverables) as the MAS platform for supporting the execution of the MAS system. The platform follows the FIPA standards [14] offering a set of useful mechanisms for the agents to communicate and also tools to allow programming agents in a high level language based on the BDI model. Magentix2 is an open system which facilitates the interaction between heterogeneous agents through FIPA-ACL messages. Also complex interactions can be carried out in a flexible an open way as conversations. The platform offers special structures to allow to use such conversations by considering a set of issues: In each conversation there are always two roles involved: Initiator and Participant. The first is the one who initiates the conversation, and the rest of agents play the Participant role. The conversation can be seen as a direct graph where nodes represent the actions to perform in each step of the conversation and arcs represent the transition between such states. Those steps allow to perform some actions and they can be of different kinds, for example: Begin, Final, Wait, Send, Receive, Action, etc. Conversations have a unique identifier that allows to manage them individually. 1Botti Navarro, VJ.; Garrido Tejero, A.; Giret Boggino, AS.; Noriega, P.; Bexi, A. (2013). mWater prototype #3 analysis and design. http://hdl.handle.net/10251/3212