Technical Support Packages

Experimental Confirmation of an Aquatic Swimming Motion Theoretically of Very Low Drag and High Efficiency

Researchers used an anguilliform swimming robot to replicate an idealized “wakeless” swimming motion.

It has been established theoretically that self-propulsion of deformable bodies in ideal fluid can occur with a careful specification of the deformation mode shape. With the fluid assumed ideal, vortex shedding, rotational wake, and induced drag would not occur. The implication is that for a real fluid, provided the existence of a thin boundary layer, similarly configured bodies with the same deformation mode shape self-propel without vortex shedding, rotational wake, and induced drag. Only viscous drag effects, due to the existence of the thin boundary layer, are present and unavoidable. The motion mode in question is the little-exploited anguilliform mode exhibited in some aquatic animal swimming. The Anguilla includes the snake, eel, lamprey, and leach, among others.

Posted in: Briefs, TSP, TSP, Aerospace, Automation

Identifying the Flow Physics and Modeling Transient Forces on Two-Dimensional Wings

Using mathematics and modeling to understand the flow physics of aircraft wings undergoing highly unsteady maneuvers.

The main objective of this research was to better understand the flow physics of aircraft wings undergoing highly unsteady maneuvers. Reduced-order models play a central role in this study, both to elucidate the overall dynamical mechanisms behind various flow phenomena (such as dynamic stall and vortex shedding), and ultimately to guide flight control design for vehicles for which these unsteady phenomena are important.

Posted in: Briefs, TSP, TSP, Aerospace, Automation, Robotics

ISO 26262 & Automotive Electronics Development

Compliance standards, especially those that involve relatively new functional safety elements, will likely add additional requirements to the development process. But ISO 26262, in particular, will add more than new requirements to the product life cycle for automotive hardware-software systems. This Functional Safety standard will act as a framework impacting integrated requirements traceability, risk management, validation, verification, documentation and collaboration throughout the systems engineering “V” model life cycle process (see Figure). ISO 26262 will also require the qualification of tools used to create automotive systems. This paper examines the impact of the standard on the development process and support tool chains for automotive electronics.

Posted in: Briefs, TSP, Electronics & Computers, Information Sciences, Semiconductors & ICs, Software, Computer software and hardware, Life cycle analysis, Safety regulations and standards

PTC Heater Brings Greater Control for Hand-held Medical Devices and Disposables

Point of Care diagnostics devices, whether handheld or single-use, often require a brief application of tightly controlled heat. The disposable nature of these devices requires a low-cost component capable of delivering that heat reliably and safely. Heatron's new PTC heater solution uses a polymer-based heater technology that controls heat to within ±2°C of the target temperature, and reduces unit cost by eliminating sensors and applied controls.

Posted in: White Papers, Briefs, TSP, Electronics & Computers, Thermoelectrics, Medical, Medical equipment and supplies, Heating, ventilation, and air conditioning systems (HVAC), Polymers

Metal Stamping Design Guidelines

Metal Stamping provides an economical way to produce quantities of parts that can possess many qualities, including strength, durability, wear resistance, good conductive properties, and stability. In this paper, we are sharing some ideas that can help you design a part that optimizes all the features that the metal stamping process offers.

Posted in: Briefs, TSP, Aeronautics, Manufacturing & Prototyping, Materials, Mechanical Components, Design processes, Stamping, Metals, Parts

Heading Versus Tilt Chart for Assessing HGA Occlusion and Flop Risk in MSL Operations

This approach is useful for rovers on Mars or other celestial bodies to point the antenna toward the Earth to transmit data without obstructions to the tracking stations.

NASA’s Jet Propulsion Laboratory, Pasadena, California

The Mars Science Laboratory (MSL) high-gain antenna (HGA) sits low on the deck, leaving the sky occluded in many directions by other parts of the rover. Each drive must end with the rover at a heading where the Earth will be unoccluded during the next HGA communications pass. This is a multidimensional problem that can take considerable time to assess in detail. For a portion of heading/tilt space, the Earth track starts outside joint limits for one kinematic pointing solution, and ends outside joint limits for the other. Tracking would either stop at the joint limit, or go off Earth point (“flop”) in the middle of the pass in order to change kinematic solutions to complete the pass. Special attention to uplink must be made when a drive ends at a heading where there is risk of a flop.

Posted in: Briefs, TSP, Automation, Robotics, Antennas, Spacecraft

Rapid Forest Triage by Sub-Canopy Micro Air Vehicles

Applications include rapid assessment of biomass for commercial forestry and carbon offsets.

NASA’s Jet Propulsion Laboratory, Pasadena, California

Today, tree distribution maps can only be generated manually in a very time-consuming process, and real-time microclimate mapping of a large 3D volume under tree canopy is not possible. A prototype small quadrotor unmanned aerial vehicle (UAV) system was developed that is able to maneuver in cluttered environments like forests, and under tree canopy to map tree distributions from 3D point clouds gathered from an onboard stereo vision system. The UAV uses a small onboard sensor board to record micro-climate parameters during flight.

Posted in: Briefs, TSP, Automation, Robotics, Cartography, Sensors and actuators, Weather and climate, Unmanned aerial vehicles

Deployable Antenna Circuit Board Material Design and Fabrication Process

This technology has applications in solar arrays for small satellites.

The Integrated Solar Array and Reflectarray (ISARA) antenna requires a rugged circuit board material that will meet the following requirements: (1) remains sufficiently flat over the required operating temperature range with solar cells mounted, and under full solar illumination, including heat dissipation due to ≈30% efficiency solar cells; (2) provides a sufficiently high-quality RF-grade circuit board material needed to print the reflectarray antenna; (3) is sufficiently thin (<2.5 mm) to fit within the available stowage volume; and (4) has low mass density (≈5 kg/m2).

Posted in: Briefs, TSP, Electronics, Electronics & Computers, Antennas, Integrated circuits, Fabrication

Mini-Stamp as a Micro-Display for At-a-Glance Subsystem Information for DSN Links

NASA’s Jet Propulsion Laboratory, Pasadena, California

Operators of the Deep Space Network (DSN) attend to numerous tasks with the overall goal of providing continuous support for the world’s deep space missions. This high-stakes operations environment requires operators to understand the state of the DSN and predict what will happen next. Under the Follow-the-Sun initiative that requires remote operations of the highly complex telecommunications equipment, operators will need to remain aware of the state of the entire network rather than just their own facility, and transition fluidly between periods of low activity and periods of high demand.

Posted in: Briefs, TSP, Communications, Antennas, Telecommunications systems

Ka-Band Parabolic Deployable Antenna (KaPDA)

This technology provides high-data-rate communication to enable high-fidelity instruments and deep space, interplanetary missions.

CubeSats provide the ability to conduct relatively inexpensive space missions. Over the past several years, technology and launch opportunities for CubeSats have exploded, enabling a wide variety of missions. However, as instruments become more complex and CubeSats travel deeper into space, data communication rates become an issue as highlighted by a recent NASA centennial challenge proposal. A Ka-band highgain antenna would provide a ≈100× increase of data communication rates over an S-band high-gain antenna, and a ≈10,000× increase over an X-band patch antenna of the same input power, enabling high-rate data communication from deep space or the use of dataintensive instruments from low Earth orbit (LEO).

Posted in: Briefs, TSP, Communications, Antennas, Satellite communications

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