346 research outputs found
Flexible and robust control of heavy duty diesel engine airpath using data driven disturbance observers and GPR models
Diesel engine airpath control is crucial for modern engine development due to increasingly stringent emission regulations. This thesis aims to develop and validate a exible and robust control approach to this problem for speci cally heavy-duty engines. It focuses on estimation and control algorithms that are implementable to the current and next generation commercial electronic control units (ECU). To this end, targeting the control units in service, a data driven disturbance observer (DOB) is developed and applied for mass air ow (MAF) and manifold absolute pressure (MAP) tracking control via exhaust gas recirculation (EGR) valve and variable geometry turbine (VGT) vane. Its performance bene ts are demonstrated on the physical engine model for concept evaluation. The proposed DOB integrated with a discrete-time sliding mode controller is applied to the serial level engine control unit. Real engine performance is validated with the legal emission test cycle (WHTC - World Harmonized Transient Cycle) for heavy-duty engines and comparison with a commercially available controller is performed, and far better tracking results are obtained. Further studies are conducted in order to utilize capabilities of the next generation control units. Gaussian process regression (GPR) models are popular in automotive industry especially for emissions modeling but have not found widespread applications in airpath control yet. This thesis presents a GPR modeling of diesel engine airpath components as well as controller designs and their applications based on the developed models. Proposed GPR based feedforward and feedback controllers are validated with available physical engine models and the results have been very promisin
Smart materials and vehicle efficiency. Design and experimentation of new devices.
In this dissertation the activities carried out during the PhD are comprehensively
described. The research mainly focused on the development
of novel smart devices aimed at disengaging auxiliaries in internal combustion
engine vehicles. In particular, the activities dealt with modeling,
design, manufacturing and testing different fail-safe magnetorheological
clutch prototypes, in the framework of a project funded by Regione
Toscana, which involved two departments of the University of Pisa and
Pierburg Pump Technology - Stabilimento di Livorno.
After an extended literature review, several concepts of the clutch
were proposed, which led to the design of the first magnetorheological
prototype. An intensive experimental campaign was conducted, which
involved several prototypes. A particular attention was focused on the
measurement and analysis of the torque transmitted by the clutch in
different operating conditions and new indices were proposed to objectively
analyze the performances of magnetorheological clutches in general. On
the basis of the results of the first experimental phase, the limits of the
first design were analyzed and a novel prototype was developed, which
succeeded in fulfilling all the design specifications.
Further analyses were carried out in order to develop a clutch model
starting from the experimental results. The effect of clutch heating was
considered and a complete model of the clutch based on neural networks
was proposed. The model was capable of taking into account the effect
of the main parameters influencing the torque characteristic and may be
used in a vehicle simulator or in a hardware-in-the-loop bench.
Finally, an additional component to be connected to the clutch, which
made use of shape memory alloys, was developed and tested during the
visiting period at the University of Toledo (OH), USA
Development and Initial Evaluation of an Acoustic Apparatus Used For Testing of Farfield Noise Emitted by a Propeller in a Short Duct
The purpose of this thesis was to design, construct and evaluate an apparatus which was used for testing of acoustic emissions by a propeller in a short duct. An apparatus was designed based on a combination of acoustic principles and a desire to be able apply the knowledge gained to a practical application such as an ultralight aircraft in an effort to reduce the overall noise levels emitted. The apparatus consisted of a 35 horsepower ultralight engine, a four bladed ultralight propeller, and a duct constructed of a foam core covered with fiberglass. Initial evaluations compared noise levels from the apparatus both with and without the shroud in place, as well as various engine silencer configurations. The data gathered proved the apparatus was actually about 6 dB louder with the shroud than without the shroud as a result of strong rotor-stator interactions. Based on the initial evaluations, this apparatus demonstrated its potential for further testing and acoustical work in the principles of rotor-stator interactions, short duct acoustics, and active noise control applications with the long range goal being to reduce the acoustic emissions from propeller driven aircraft
Aeronautical Engineering. A continuing bibliography, supplement 115
This bibliography lists 273 reports, articles, and other documents introduced into the NASA scientific and technical information system in October 1979
Cooperation of active steering control of wheelsets with subsystems of an autonomous urban rail vehicle
The paper presents the motivations for the application of actively controlled elements in the running gear of a rail vehicle and the challenges that need to be addressed before deploying vehicles with actively controlled elements in real operation. Furthermore, the paper presents the design of an active element concept and its control for steering the axles of an urban rail vehicle to improve the vehicle’s passage through small radius curves. The design takes into account the fundamental issues of cost and safety of the application of active elements, which are addressed in the presented control design by using data from autonomous driving subsystems such as the environmental database or the anti-collision system
Volume 2 – Conference
We are pleased to present the conference proceedings for the 12th edition of the International Fluid Power Conference (IFK). The IFK is one of the world’s most significant scientific conferences on fluid power control technology and systems. It offers a common platform for the presentation and discussion of trends and innovations to manufacturers, users and scientists. The Chair of Fluid-Mechatronic Systems at the TU Dresden is organizing and hosting the IFK for the sixth time. Supporting hosts are the Fluid Power Association of the German Engineering Federation (VDMA), Dresdner Verein zur Förderung der Fluidtechnik e. V. (DVF) and GWT-TUD GmbH. The organization and the conference location alternates every two years between the Chair of Fluid-Mechatronic Systems in Dresden and the Institute for Fluid Power Drives and Systems in Aachen. The symposium on the first day is dedicated to presentations focused on methodology and fundamental research. The two following conference days offer a wide variety of application and technology orientated papers about the latest state of the art in fluid power. It is this combination that makes the IFK a unique and excellent forum for the exchange of academic research and industrial application experience. A simultaneously ongoing exhibition offers the possibility to get product information and to have individual talks with manufacturers. The theme of the 12th IFK is “Fluid Power – Future Technology”, covering topics that enable the development of 5G-ready, cost-efficient and demand-driven structures, as well as individual decentralized drives. Another topic is the real-time data exchange that allows the application of numerous predictive maintenance strategies, which will significantly increase the availability of fluid power systems and their elements and ensure their improved lifetime performance. We create an atmosphere for casual exchange by offering a vast frame and cultural program. This includes a get-together, a conference banquet, laboratory festivities and some physical activities such as jogging in Dresden’s old town.:Group 1 | 2: Digital systems
Group 3: Novel displacement machines
Group 4: Industrial applications
Group 5: Components
Group 6: Predictive maintenance
Group 7: Electro-hydraulic actuatorsDer Download des Gesamtbandes wird erst nach der Konferenz ab 15. Oktober 2020 möglich sein.:Group 1 | 2: Digital systems
Group 3: Novel displacement machines
Group 4: Industrial applications
Group 5: Components
Group 6: Predictive maintenance
Group 7: Electro-hydraulic actuator
NASA Tech Briefs, December 1990
Topics: New Product Ideas; NASA TU Services; Electronic Components and Circuits; Electronic Systems; Physical Sciences; Materials; Computer Programs; Mechanics; Machinery; Fabrication Technology; Mathematics and Information Sciences; Life Sciences
Aeronautical engineering: A continuing bibliography with indexes (supplement 289)
This bibliography lists 792 reports, articles, and other documents introduced into the NASA scientific and technical information system in Mar. 1993. Subject coverage includes: design, construction and testing of aircraft and aircraft engines; aircraft components, equipment, and systems; ground support systems; and theoretical and applied aspects of aerodynamics and general fluid dynamics
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