Servo Couplings for High-Tech Systems

Proper coupling ensures a design will meet performance requirements and have a long, trouble-free life.Couplings are a critical part of system performance in high-tech applications, yet they are often one of the last components to be specified. Selecting the proper coupling ensures the equipment will meet performance requirements and have a long, trouble-free life. Poor coupling selection can lead to high maintenance costs, frequent downtime, and imprecise positioning.

Posted in: Articles, Joining & Assembly, Motion Control, Power Transmission, Sensors and actuators, Materials properties, Fittings, Parts


Metallic Glass Shatters Gear Limitations

Gears play an essential role in precision robotics, and they can become a limiting factor when the robots must perform in space missions. In particular, the extreme temperatures of deep space pose numerous problems for successful gear operation. At NASA’s Jet Propulsion Laboratory (JPL) in Pasadena, CA, technologist Douglas Hofmann and his collaborators aim to bypass the limitations of existing steel gears by creating gears from bulk metallic glass (BMG).

Posted in: Articles, Aerospace, Manufacturing & Prototyping, Metals, Mechanical Components, Motion Control, Motors & Drives, Power Transmission, Robotics, Robotics, Alloys, Glass, Gears, Durability, Spacecraft


Dike Inspection Robot is Energy-Autonomous

The robot's drive train, including the dual-hemisphere system. (Image: University of Twente) Inspecting the condition of dikes and other sea defense structures is typically a task for robots, working in a team and in a highly autonomous way. But if they move around across the dikes, perform tests, and communicate the results for six hours a day, they use a lot of energy.

Posted in: News, Motion Control, Motors & Drives, Power Transmission


Rocket Motor Design Could Boost Small Satellite Missions

Artists concept of a CubeSat onboard propulsion system. (Photo: Inside Out Visuals) Researchers at Los Alamos National Laboratory have developed a rocket motor concept that could be used to power CubeSat low-cost satellites. The Los Alamos team recently tested a six-motor CubeSat-compatible propulsion array with tremendous success.

Posted in: News, Motors & Drives, Power Transmission


Film Cooled Surface

This cooling technique increases the efficiency of turbine blades.Turbine film cooling flows typically are subject to jet detachment and reduced cooling effectiveness for high blowing rates. Current concepts to improve jet attachment involve impractical or overly complex hole designs due to manufacturing or durability constraints. Novel film cooling concepts from NASA’s Glenn Research Center involve creating a V-shaped recess on the flow surface of a turbine blade to induce fluid, temperature, or shedding effects; threading turbine film cooling holes with helical channels or grooves (much like the threads of a screw) for the purpose of producing a swirling flow of cooling fluid exiting the film cooling hole; and pairing the threaded holes with holes that have an opposite direction of swirl.

Posted in: Briefs, Aeronautics, Aerospace, Propulsion, Computational fluid dynamics, Cooling, Machining processes, Gas turbines


NASA’s Pursuit of Power

Advances in batteries and propulsion enable innovations in both terrestrial and deep-space power applications. Advances in Capacitor MaterialsElectrochemical capacitors, or supercapacitors, have gained intense interest as an alternative to traditional energy storage devices. Applications for supercapacitors range from plug-in hybrid electric vehicles (PHEVs) to backup power sources. While the power density of supercapacitors surpasses that of batteries, commercially available batteries have a significantly higher specific energy density.

Posted in: Articles, Aerospace, Power Management, Propulsion, Batteries, Energy storage systems, Ultracapacitors and supercapacitors, Nanomaterials, Spacecraft


Generation-2 Lean Direction Injection System

This technology eliminates the risk of flashback and auto-ignition, and achieves emission and operability goals. John H. Glenn Research Center, Cleveland, Ohio An advanced Lean-Direct-Injection (LDI) turbine engine combustor was developed. Named LDI-II, which stands for second-generation LDI, this technology has vastly improved and expanded the performance characteristics of the initial LDI design by not only exceeding NASA’s N+2 emissions goal, but also meeting the operability requirements of full engine power range. The key enabling feature of the technology is the coherence combination of fuel staging and positioning/sizing of swirler-venturi fuel/air mixer elements.

Posted in: Briefs, Propulsion, Exhaust emissions, Fuel injection, Gas turbines


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