Keyword: Engine mechanical components

Briefs: Mechanical & Fluid Systems

A class of self-adjusting injectors for spraying liquid oxidizers and/or fuels into combustion chambers has been proposed. The proposed injectors were originally intended for use in...

Briefs: Mechanical & Fluid Systems
Metering Gas Strut for Separating Rocket Stages

A proposed gas strut system would separate a liquid-fueled second rocket stage from a solid-fueled first stage using an array of pre-charged struts. The strut would be a piston-and-cylinder mechanism containing a compressed gas. Adiabatic expansion of the gas would drive the extension of the strut....

Briefs: Physical Sciences
True Shear Parallel Plate Viscometer

This viscometer (which can also be used as a rheometer) is designed for use with liquids over a large temperature range. The device consists of horizontally disposed, similarly sized, parallel plates with a precisely known gap. The lower plate is driven laterally with a motor to apply shear to the liquid in...

Briefs: Mechanical & Fluid Systems

Sprag handle wrenches have been proposed for general applications in which conventional pawl-and-ratchet wrenches and sprag and cam “clickless” wrenches are now used. Sprag handle wrenches are so named because they...

Articles: Green Design & Manufacturing

The phrase “everything old is new again” certainly applies to today’s flywheel technology. Forget the mechanical bearing, standard atmosphere 5,000...

Briefs: Manufacturing & Prototyping
Triaxial Swirl Injector Element for Liquid-Fueled Engines

A triaxial injector is a single bi-propellant injection element located at the center of the injector body. The injector element consists of three nested, hydraulic swirl injectors. A small portion of the total fuel is injected through the central hydraulic injector, all of the oxidizer...

Briefs: Physical Sciences

An ocean thermal energy conversion (OTEC), now undergoing development, is a less-massive, more-efficient means of exploiting the same basic principle as that of the proposed system described in...

Briefs: Mechanical & Fluid Systems

A magnetostrictive brake has been designed as a more energy-efficient alternative to a magnetic fail-safe brake in a robot. (In the specific application, “fail-safe” signifies that the brake is normally engaged;...

Briefs: Manufacturing & Prototyping

An improved design concept for coaxial propellant injectors for a rocket engine (or perhaps for a non-rocket combustion chamber) offers advantages of greater robustness, less...

Briefs: Physical Sciences
Wavefront Control and Image Restoration With Less Computing

PseudoDiversity is a method of recovering the wavefront in a sparse- or segmented-aperture optical system typified by an interferometer or a telescope equipped with an adaptive primary mirror consisting of controllably slightly moveable segments. (PseudoDiversity should not be confused...

Briefs: Physical Sciences

An adaptive-nulling method has been proposed to augment the nulling-optical-interferometry method of detection of Earth-like planets around distant stars. The method is intended to...

Briefs: Mechanical & Fluid Systems
Miniature Lightweight Ion Pump

This design offers a larger surface area for pumping of active gases and reduces the mass of the pump by eliminating the additional vacuum enclosure. There are three main components to this ion pump: the cathode and anode pumping elements assembly, the vacuum enclosure (made completely of titanium and used as the...

Briefs: Physical Sciences

A method is proposed for end-toend, full aperture testing of large-aperture telescopes using an innovative variation of a Hartmann mask. This technique is practical for telescopes...

Briefs: Physical Sciences
Gas Flow Detection System

This system provides a portable means to detect gas flow through a thin-walled tube without breaking into the tubing system. The flow detection system was specifically designed to detect flow through two parallel branches of a manifold with only one inlet and outlet, and is a means for verifying a space shuttle program...

Briefs: Physical Sciences
Optical Tapers as White-Light WGM Resonators

A theoretical analysis has revealed that tapered optical waveguides could be useful as white-light whispering-gallerymode (WGM) optical resonators. The compactness and the fixed-narrow-frequency- band nature of the resonances of prior microdisk and microsphere WGM resonators are advantageous in...

Briefs: Manufacturing & Prototyping
Discrete Fourier Transform Analysis in a Complex Vector Space

Alternative computational strategies for the Discrete Fourier Transform (DFT) have been developed using analysis of geometric manifolds. This approach provides a general framework for performing DFT calculations, and suggests a more efficient implementation of the DFT for applications...

Briefs: Test & Measurement

The multimodal friction ignition tester (MFIT) is a testbed for experiments on the thermal and mechanical effects of friction on material specimens in pressurized, oxygen-rich atmospheres. In simplest...

Briefs: Mechanical & Fluid Systems

Pressure-energized seal rings intended to withstand flows better than do conventional pressure-energized seal rings have been conceived. The concept applies, more specifically, to seal...

Briefs: Mechanical & Fluid Systems

A multiple-throat venturi system has been invented for measuring laminar flow of air or other gas at low speed (1 to 30 cm/s) in a duct while preserving the laminar nature of the flow and keeping...

Articles: Motion Control

Next-generation flywheels are made possible by advances in material science in rotor technology, as well as the application of magnetic bearings running in a vacuum environment....

Articles: Medical

Kristina Irsch Wilmer Ophthalmological Institute, Johns Hopkins University
School of Medicine
Baltimore, MD

Amblyopia, commonly known as “lazy eye,” is the leading cause of vision loss in...

Application Briefs: Robotics, Automation & Control

There’s a science to testing metal structures for rigidity and performance under stress. The development of new testing methodologies is continuing at a fast pace, aided...

Articles: Photonics/Optics

In spectrometry, the more light gathered the better the results. Yet in many applications, both military and commercial, the need to protect instruments or operators from harsh...

Briefs: Materials

A proposed system for exploiting the ocean thermal gradient to generate power would be based on the thawing-expansion/ freezing-contraction behavior of a wax or perhaps another suitable...

Briefs: Software
Simulating Attitudes and Trajectories of Multiple Spacecraft

A computer program called “42” simulates the attitudes and trajectories of multiple spacecraft flying in formation anywhere in the Solar System. The rotational dynamics are represented by high-fidelity models of spacecraft, each comprising as many as three connected rigid bodies...

Briefs: Mechanical & Fluid Systems
Demisable Reaction-Wheel Assembly

A document discusses the concept of a demisable motor-drive-and-flywheel assembly [reaction-wheel assembly (RWA)] used in controlling the attitude of a spacecraft. “Demisable” as used here does not have its traditional legal meaning; instead, it signifies susceptible to melting, vaporizing, and/or otherwise...

Briefs: Mechanical & Fluid Systems

An apparatus is being developed for sampling water for signs of microbial life in an ocean hydrothermal vent at a depth of as much as 6.5 km. Heretofore, evidence of microbial life in deep-sea hydrothermal...

Briefs: Manufacturing & Prototyping

A method has been devised for high-volume, high-velocity surface deposition of protective metallic coatings on otherwise vulnerable surfaces. Thermal spraying is used...

Application Briefs: Robotics, Automation & Control

What do you do if you’re in the business of producing a wide variety of metal presses to meet special customer requirements? You choose your system components wisely, and...