This thesis addresses modeling and active surge control of a simple compression system, using only the drive system of the compressor for actuation. Theoretical results are validated by experiments on a test rig that was built as a part of this work. Control laws are derived in two stages. First all system states, such as pressure mass ‡ow and impeller speed, are assumed as available signals. A...

In filling lines equipped with membrane separation devices in the form of filters energy, consumption is only one important working parameters, other being sustainable filter performance terms efficiency. As line typically a valve, intermittent operation an its use. Whereas overall energy filtration process governed by continuous mode, characterised opening/closing contributes most to problems ...

Widespread adoption of structural control systems has been limited by the perception that systems might prove to be unreliable over their operational life spans. To address this concern, a novel decentralized control implementation that is responsive to actuation failures is proposed. Termed energy market-based control (EMBC), a control system is modeled as a free market economy where actuators...

Abstract This paper discusses stiffness and antagonistic actuation in light-weight cable-driven bio-inspired manipulators suitable for safe interactions. Manipulators under study are built upon arranging series several tensegrity joints, called “modules.” A comparative of modules revealed that the X module, contrast to based on pivots, allows one increase joint by increasing input forces like d...

The global automotive industry is undergoing a significant transition as battery electric vehicles enter the market and diesel sales decline. It widely recognized that internal combustion engines (ICE) will be needed for transport years to come; however, demands on ICE fuel efficiency, emissions, cost, performance are extremely challenging. Gasoline compression ignition (GCI) one approach achie...

Calcific aortic valve disease is common, affecting 25% of adults over the age of 65 years, with progression to severe valve obstruction resulting in more than 50 000 aortic valve replacements annually in the United States. “Degenerative” calcific aortic valve disease was thought for many years to be a passive accumulation of calcium binding to the aortic surface of the valve leaflet. Now, convi...

Crosswinds will lead to large-scale flow separation in the nacelle inlets, which seriously affects flight safety of aircraft; there is an urgent need develop control measures. As a plasma method, application surface dielectric barrier discharge field inlet great significance for improving intake quality. Based on characteristic law baseline field, effect experiments with NS-DBD, and influence a...

s spring In some nuclear reactor containment isolation applica­ Greek tions, butterfly valves with pneumatic actuators are used to close pipelines in the event of containment p density pressure transients resulting from postulated acci­ e angular position dents. A model is developed which predicts the closure time history of such valve/actuator systems INTRODUCTION under prescribed transients. ...