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ACX proposes an alternate approach to damping for extreme environments, which uses an electrically shunted, surface mounted, smart material. This shunting approach has been most widely used in less extreme environments in conjunction with piezoceramic materials. The smart material is bonded to the surface of the target structure, in this case a part inside an aircraft engine. Stress on the part ...

Active Control eXperts, (ACX) Inc. proposes to design, fabricate, and demonstrate a novel hybrid vibration ccntrol actuator system capable of very precise, controllable motion. This system will combine the advantages of a capacitive actuator with feedback control capability. This system will possess the force and stroke characteristics of a small hydraulic device and the bandwidth of electric moto ...

In many structures with vibration problems, the nature of the problem is uncertain, or varies over time. Thus it is not possible 'a priori to design a linear, time-invariant, (LTI) feedback control law which is guaranteed to meet performance, or possibly even stability requirements over the entire operating range. These applications require an intelligent control system which can adapt to the ch ...

Many military missions involve the use of equipment that requires small batteries for power where AC grid power is unavailable. Also, there is a need for a high quality power output device that conditions a power input to make it suitable to power sensitive communications equipment. The weight of this equipment is also a factor which affects Its usefullness in quick moving military situations. M ...

A unique approach is proposed for the effective rejection of cochannel, but otherwise arbitrary, jamming and other interference in GPS reception. The approach is based on a method of processing a multiplicity of signals sharing the same time-frequency and polarization space, in such a way as to favor a bona fide GPS signal over the others present (jamming, spoofing, multipath, atmospherics or oth ...

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50854-98-I Development of Corrosion Inhibitors for Absorption Heat Pumps--Advanced Mechanical Technology, Inc., 176 Waltham Street, Watertown, MA 02172-4809; (617) 926-6700 Dr. Joseph Gerstmann, Principal Investigator Mr. Andrew D. Vasilakis, Business Official DOE Grant No. DE-FG02-98ER82519 Amount: $75,000 In order to compete effectively in the marketplace, advanced absorption heat pumps need ...

Helium plays several critical rolls in spacecraft propulsion. High pressure helium is commonly used to pressurize propellant fuel tanks. Helium cryocoolers can be used to sub-cool and thereby densify cryogenic propellants such as liquid hydrogen (LH2) and liquid oxygen (LO2). The use of densified cryogenic propellants can reduce the gross payload weight of a launch vehicle by up to 20%, or incr ...

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