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Briefs: Mechanical & Fluid Systems
Improved Inlets for T-38 Airplane

A change in the design of the engine inlets of the T-38 airplane significantly reduces takeoff distances while increasing safety margins. Although the newer inlet design (see Figure 1) is based on well-known...

Briefs: Mechanical & Fluid Systems
High-Altitude Flight Test of the Perseus B Airplane

The Perseus B remotely piloted vehicle (RPV) has achieved a record altitude for a single-engine, propeller-driven airplane of 60,260 ft (18,367 m) on June 27, 1998. The Perseus B is one of the...

Briefs: Mechanical & Fluid Systems
Stable, Soft-Opening/Soft-Closing Pressure-Relief Valves

Improved pressure-relief valves have been developed for systems that contain gases and liquids in a variety of pneumatic, hydraulic, and cryogenic applications. These valves could prove...

Briefs: Mechanical & Fluid Systems
Hollow Shaft Actuators with Harmonic Drive Gearing

Harmonic drive gearing is recognized by designers for its zero backlash, high gear ratios, and compact design features. A recent development by HD Systems incorporates a large hollow shaft through...

Briefs: Mechanical & Fluid Systems
Laser Anemometer Measures Flow in a Centrifugal Compressor

Detailed measurements of complex flow fields within the NASA Low Speed Centrifugal Compressor (LSCC) have been acquired. The measurement data provide insight into the fundamental physics...

Briefs: Mechanical & Fluid Systems
Magnetostrictive Inertial-Reaction Linear Motors

Linear-translation motors containing inertial-reaction masses driven by magnetostrictive actuator elements are undergoing development. These motors could be used to make fine position adjustments in...

Briefs: Mechanical & Fluid Systems
Pulse-tube Refrigerator Unit

Pulse-tube Refrigerators can be operated over a wide range of temperatures. These units can be used in numerous space and commercial refrigeration applications, including food refrigerator/freezers, laboratory...

Briefs: Mechanical & Fluid Systems
Deflection of Stretched Circular Membrane Under Pressure

Equations have been derived to describe the deflection of a circular membrane under both in-plane and transverse loads. More specifically, the equations describe the radial (in-plane) and...

Briefs: Mechanical & Fluid Systems
Improved Lifetime for Stirling Cryogenic Coolers

A Stirling cooler is a mechanical system that approximates the ideal gas cycle. Often associated with airborne or portable cooling applications that require compact design and low input power,...

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