Keyword: Pistons

Articles: Materials
Taking a holistic approach to sealing systems in hydraulic systems using chrome alternatives helps engineers achieve optimum function.
Briefs: Mechanical & Fluid Systems

Conventional pistons are made of a rigid chamber and a piston inside that can slide along the chamber’s inner wall while at the same time maintaining a tight seal. As a result, the piston...

Articles: Motion Control

A new valve concept consists of a solid piston floating in a medium to control a flowstream. Although the conical shape of the seat is a prominent feature of the valve, especially when the concept was...

Briefs: Propulsion

NASA's Glenn Research Center has developed a novel Double-acting Extremely Light Thermo-Acoustic (DELTA) converter that operates at high frequencies (>400 Hz) with greatly...

Briefs: Medical
Cell Processing Cartridge for Miniature Cytometer

Portable flow cytometers, especially in handheld or briefcase sizes, have not been available. One reason is the need to support complex, high-pressure fluidics and process cells using a centrifuge and mixing device. A need existed for point-of-care and/or point-of-analysis flow cytometry.

Articles: Motion Control

For most electrical engineers, the simple term “motor” means one thing: an electromagnetic rotary-motion unit. Engineers who need linear rather than rotary motion consider adding a mechanical...

Briefs: Motion Control

Soft robots are made from soft materials that react to applied voltage with a wide range of motions. Such soft robots contain tremendous potential for future applications, as they adapt to dynamic...

Briefs: Test & Measurement

Measurement devices that can withstand the acid rains on Venus, radiation in space, and the heat of car engines are being developed to improve research in these extreme...

Briefs: Materials
Aluminum Alloy for High-Temperature Applications

NASA’s Marshall Space Flight Center originally developed a high-performance piston alloy to meet U.S. legislative restrictions on vehicular exhaust hydrocarbon emissions. NASA 398 aluminum alloy exhibits excellent tensile and fatigue strength at elevated temperatures. NASA 398 alloy also offers...

Briefs: Mechanical & Fluid Systems

NASA’s Marshall Space Flight Center scientists have invented a novel valve actuator where the primary actuating system and return spring system are arranged non-collinearly. In the past, valve actuators...

Briefs: Mechanical & Fluid Systems

Uncontrolled and rapid movement of equipment and people through security gates has been a major problem for security personnel. In situations pertaining to facility security, it is desirable to delay the passage of...

Briefs: Propulsion
Rotary Piston Engine

There are many applications where a high power-to-weight engine is either necessary or helpful. Uses for this type of engine range from handheld power equipment, to motorcycles and aircraft — uses multiply when fuel efficiency, compactness, and versatility are added. Currently, there are few viable options available to...

Articles: Motion Control

There may be no stronger ally of electrical power utilities than industrial size air compressors, as they drone on every day, taking atmospheric air and transforming it into useful...

Briefs: Motion Control
Mechanisms for Achieving Non-Sinusoidal Waveforms on Stirling Engines

The current state-of-the-art Stirling engines use sinusoidal piston and displacer motion to drive the thermodynamic cycle and produce power. Research performed at NASA Glenn has shown that non-sinusoidal waveforms have the potential to increase Stirling engine power density,...

Briefs: Mechanical & Fluid Systems
Improving Stirling Engine Performance Through Optimized Piston and Displacer Motion

Stirling engines typically achieve high efficiency, but lack power density. Low power density prevents them from being used in many applications where internal combustion engines are viable competitors, and increases system costs in applications that require...

Briefs: Manufacturing & Prototyping

NASA’s Marshall Space Flight Center (MSFC) developed Ultrasonic Stir Welding (USW) to join large pieces of very high-strength metals such as titanium and Inconel. USW, a solid-state weld process,...

Briefs: Mechanical & Fluid Systems

Human operation in space over long time periods causes bone and muscle deterioration, so there is a need for countermeasures in the form of physical exercises consisting of working against controlled...

Briefs: Test & Measurement

NASA’s Langley Research Center has developed a system to detect and locate atmospheric clear air turbulence (CAT) by means of a ground-based infrasonic array to serve as an early warning...

Briefs: Energy

Power generation from an external or internal heat source using thermal energy conversion technologies such as solid-state thermionics and thermoelectrics or dynamic conversion...

Articles: Aerospace

The technologies NASA develops don’t just blast off into space. They also improve our lives here on Earth. Life-saving search-and-rescue tools, implantable medical devices, advances in commercial aircraft...

Briefs: Mechanical & Fluid Systems
Precise Direct Control of Pressure or Vacuum Using a Digitally Controlled Actuator

A closed/semi-open pressure or vacuum system uses an electric screw mechanical actuator that can be digitally controlled and monitored, and which receives feedback directly from an external or internal source. This innovation can adjust for media temperature...

Briefs: Medical
Polymerase Chain Reaction Preparation Kit and Self-Enclosed, Pipette-Free DNA/RNA Isolation Device

The ability to monitor and detect microorganism contamination/infection is important for long space voyages, in order to maintain a clean environment not only for the health of the astronauts, but also for electronics and structural materials....

Briefs: Sensors/Data Acquisition

Position feedback sensors for hydraulic or pneumatic cylinders have used one of three traditional technologies: magnetostrictive, variable resistance, and variable inductance. As the...

Briefs: Data Acquisition

Solar-array panels will experience very low temperatures of 50 K for the proposed Europa Clipper Mission (ECM). Solar-array panels will also...

Briefs: Mechanical & Fluid Systems

Various applications exist where high-pressure valves are required, but the problem for control of such valves lies in that they have to move against a strong...

Briefs: Mechanical & Fluid Systems

Very few industries are as affected by strict test standards as the automotive sector. Nearly every automobile component (engine parts, accelerators, clutches,...

Articles: Motion Control

Some machine processes, such as presses, can require extreme accuracy in applying and holding force on an object. A popular way to measure force is via load cells. But what do you do when...

Briefs: Medical

Various machines have been developed to address the need for countermeasures of bone and muscle deterioration when humans operate over extended time in space. Even though these...

Articles: Robotics, Automation & Control

Performing closed-loop control of hydraulic servo systems is often more challenging than controlling servomotor systems. The main reason is that hydraulic systems use compressible oil to...