Systems study for an Integrated Digital-Electric Aircraft (IDEA)

The results of the Integrated Digital/Electric Aircraft (IDEA) Study are presented. Airplanes with advanced systems were, defined and evaluated, as a means of identifying potential high payoff research tasks. A baseline airplane was defined for comparison, typical of a 1990's airplane with advanced active controls, propulsion, aerodynamics, and structures technology. Trade studies led to definition of an IDEA airplane, with extensive digital systems and electric secondary power distribution. This airplane showed an improvement of 3% in fuel use and 1.8% in DOC relative to the baseline configuration. An alternate configuration, an advanced technology turboprop, was also evaluated, with greater improvement supported by digital electric systems. Recommended research programs were defined for high risk, high payoff areas appropriate for implementation under NASA leadership

An Introduction to micro electro mechanical systems (MEMS)

The remarkable progress ofMEMS (Micro Electro Mechanical Systems) research has reached the stage where practical applications are intensely pursued. Based on highperformance systems cornmercial products have made remarkable progress in many fields. This paper discusses the underlying principIes for MEMS, going over the materials and processes used for their fabrication. It also presents two state of the art examples, under development in the industry. A brief discussion of terminology is also included.Peer Reviewe

An Introduction to micro electro mechanical systems (MEMS)

The remarkable progress ofMEMS (Micro Electro Mechanical Systems) research has reached the stage where practical applications are intensely pursued. Based on highperformance systems cornmercial products have made remarkable progress in many fields. This paper discusses the underlying principIes for MEMS, going over the materials and processes used for their fabrication. It also presents two state of the art examples, under development in the industry. A brief discussion of terminology is also included.Peer Reviewe

Manufacturing checkout of orbital operational stages Midterm report, period ending 24 Feb. 1965

Manufacturing checkout of orbital operational Saturn S-IVB stage and instrument unit for parking orbit operation

Canlı Ses İşleme Ve Geribesleme Kullanılarak Sempatik Titreşen Teller İle Sound Mass Tarzı Sesler Yaratmak

Tez (Doktora) -- İstanbul Teknik Üniversitesi, Sosyal Bilimler Enstitüsü, 2015Thesis (Ph.D.) -- İstanbul Technical University, Institute of Social Sciences, 2015DoktoraPh.D

Report of the Electromechanical Subsystems Panel

Deficiencies in electromechanical flight technology are evaluated and development recommendations are made. Specific items discussed include magnetic bearings, lubrication for long life, signal and power transfer devices, servo sensing devices, deployment/retraction devices, cryogenic devices, data storage, and ordnance substitutes

RF MEMS ohmic switches for matrix configurations

Two different topologies of radio frequency micro-electro-mechanical system (RF MEMS) series ohmic switches (cantilever and clamped–clamped beams) in coplanar waveguide (CPW) configuration have been characterized by means of DC, environmental, and RF measurements. In particular, on-wafer checks have been followed by RF test after vibration, thermal shocks, and temperature cycles. The devices have been manufactured on high resistivity silicon substrates, as building blocks to be implemented in different single-pole 4-throw (SP4 T), double-pole double-throw (DPDT) configurations, and then integrated in Low Temperature Co-fired Ceramics (LTCC) technology for the realization of large-order Clos 3D networks

Pizzicato excitation for wearable energy harvesters

A new technique based on the plucking of flexible piezoelectric material can be used to boost energy harvested to power portable electronic devices

Micro-Electro-Mechanical-Systems (MEMS) and Fluid Flows

The micromachining technology that emerged in the late 1980s can provide micron-sized sensors and actuators. These micro transducers are able to be integrated with signal conditioning and processing circuitry to form micro-electro-mechanical-systems (MEMS) that can perform real-time distributed control. This capability opens up a new territory for flow control research. On the other hand, surface effects dominate the fluid flowing through these miniature mechanical devices because of the large surface-to-volume ratio in micron-scale configurations. We need to reexamine the surface forces in the momentum equation. Owing to their smallness, gas flows experience large Knudsen numbers, and therefore boundary conditions need to be modified. Besides being an enabling technology, MEMS also provide many challenges for fundamental flow-science research