Mechanical & Fluid Systems

Fluidic Oscillator Array for Synchronized Oscillating Jet Generation

This technology can be used in aerospace applications, shipbuilding, gas turbines, and commercial spa equipment.NASA’s Langley Research Center develops innovative technologies to control fluid flow in ways that will ultimately result in improved performance and fuel efficiency. Often called fluidic oscillators, sweeping jet actuators, or flip flop oscillators, these flow-control devices work based on the Coanda effect. They can be embedded directly into a control surface (such as a wing or a turbine blade) and generate spatially oscillating bursts (or jets) of fluid to improve flow characteristics by enhancing lift, reducing drag, or enhancing heat transfer. Recent studies show up to a 60% performance enhancement with oscillators. NASA offers two new fluidic oscillator designs that address two key limitations of these oscillators: coupled frequency-amplitude and random oscillations. One oscillator effectively decouples the oscillation frequency from the amplitude. The other design enables synchronization of an entire array. The new oscillators have no moving parts — oscillation, decoupling, and synchronization are achieved entirely via internal flow dynamics.

Posted in: Briefs, Fluid Handling, Mechanical Components, Mechanics, Computational fluid dynamics, Sensors and actuators, Fuel economy, Product development, Engine efficiency


Conduit Purging Device and Method

Applications include pneumatic or hydraulic tubing, high-purity gas processing, brake lines, automobiles, and aircraft.NASA’s Goddard Space Flight Center invites companies to license this dead-end welding device for use in the welding of tubing. This technology solves the problem of unacceptable welds in dead-end configurations. The technique has been proven to be highly successful with many dead-end weld configurations, as well as with various alloys. It produces a consistently higher-quality dead-end weld than conventional welding techniques, and does so in a fraction of the time. Its monitoring capability enables precision control in any deadend configuration. It is a reliable and very low-maintenance device that presents no safety concerns.

Posted in: Briefs, Mechanical Components, Mechanics, Welding, Alloys


Multi-Spoked Wheel Assembly

This innovation can be applied to robots used by first responders and others as a single ground-traction mechanism in a variety of environments. NASA Glenn researchers have developed a spoked drive mechanism for robots and other vehicles that is capable of two rotational modes. This robust ground traction (drive) assembly for remotely controlled vehicles operates smoothly not only on surfaces that are flat, but also upon surfaces that include rugged terrain, snow, mud, and sand. The assembly includes a sun gear and a braking gear. The sun gear is configured to cause rotational force to be applied to second planetary gears through a coupling of first planetary gears. The braking gear is configured to cause the assembly (or the second planetary gears) to rotate around the braking gear when an obstacle or braking force is applied.

Posted in: Briefs, Mechanical Components, Wheels, Robotics, Autonomous vehicles, Vehicle dynamics


Nanotube-Based Device Cooling System

Carbon nanotubes (CNTs) are being studied for applications in high-strength/low-weight composites and other applications. Recent research on thermal dissipation materials for high-power electronic devices is generating a lot of interest in various industries. NASA has developed a method for cooling a device, such as an electronic device, that produces extreme heat that must be dissipated. CNTs have attracted much attention due to their extraordinary mechanical and unique electronic properties. Computer chips have been subjected to higher and higher thermal loads and it is challenging to find new ways to perform heat dissipation. As a result, heat dissipation demand for computer systems is increasing dramatically. CNTs, which are known to provide high thermal conductivity and to be small and flexible, are suitable for cooling these electronic devices. One critical problem is provision of a compliant, usable composite of CNTs with a material that meets other needs for heat dissipation.

Posted in: Briefs, Mechanical Components, Electronic equipment, Thermal management, Composite materials, Materials properties, Nanotechnology


A Method for Accurate Load/Position Control of Rigidly Coupled Electromechanical Actuators

NASA has developed a technique designed to prevent cross-coupling in systems where two or more linear electro-mechanical actuators (EMA) are rigidly connected and are in danger of becoming cross-coupled. In such systems where the linked EMAs are commanded to achieve two distinct goals, such as position and load control, control problems often arise — especially at higher load and linear velocity levels. Both position and load control become inaccurate and in certain situations, stability of the overall system may be compromised. The NASA-developed approach mitigates the problem and achieves both accurate position following and desired load levels between the two (or more) actuators.

Posted in: Briefs, Mechanical Components, Mechanics, Positioning Equipment, Electronic control systems, Electronic equipment, Sensors and actuators


Ultralight Self-Deployable Solar Sails

This technology could be applied to self-deployable shelters, camping tents, sunshades, and house construction.Deployment of large structures such as solar sails relies typically upon electromechanical mechanisms, mechanically expandable or inflatable booms, launch restraints, controls, and other mechanisms that drastically increase the total mass, stowage volume, and areal density. The primary performance parameter for solar sails is areal density, which determines the acceleration of the sail. Present technology allows the solar sail areal density to be around 20 g/m2, and that permits only nearby demonstration missions.

Posted in: Briefs, Mechanical Components, Mechanics, Sun and solar, Packaging, Lightweighting, Spacecraft


Ultra-Compact Heat Rejection System

Radiator panels are the baseline heat rejection approach for most space systems. This approach is sound, but requires a large amount of surface area to radiate the anticipated heat load. The large panels require support structures to hold them in place and prevent damage. These structures impact mass and cost. Additionally, it is not practical to launch, transport, integrate, and relocate large panels as monolithic units. For this reason, a foldable scissor assembly is envisioned to stow the panels compactly and extend them before system startup. The moving parts and flexible fluid connections required for this approach add complexity and potential failure modes to the system. Some mission plans also require power system mobility for exploration well beyond the base camp. For this scenario, the radiator assemblies must be retracted, stowed, and redeployed each time the system is moved. These activities require time and effort, and they expose the radiator panels and associated mechanisms to damage risk. Even when properly stowed, the relatively thin panels could be damaged during transportation.

Posted in: Briefs, Mechanical Components, Mechanics, Thermal management, Packaging, Radiators, Spacecraft


The U.S. Government does not endorse any commercial product, process, or activity identified on this web site.