Motion Control

Evaluation of Rail Gun Technology for Launch Assist of Air-Breathing Rockets

John F. Kennedy Space Center, Florida A prototype horizontal electromagnetic rail launcher has been demonstrated along with a corresponding theory. This system builds out of published work in augmented rail guns, but modifies this technology so that the motor can operate for seconds rather than milliseconds, and provide low acceleration (such as might be needed to launch an aircraft) rather than the extreme accelerations seen in the guns. The final system operates off of relatively low voltages (tens of volts), but with substantial currents. A lab bench prototype has been constructed and operated, demonstrating 13 Gs acceleration of a small 230-gram sled.

Posted in: Briefs, Motors & Drives

Read More >>

Using Harmonics to Control Flutter in Wings with Electrical Motors

This control system concept applies principles of forced aeroelasticity to distributed electric propulsion systems. Armstrong Flight Research Center, Edwards, California As aeronautics engineers develop innovative distributed electric propulsion systems, they face new challenges in ensuring that these innovative aircraft are safe as well as fuel efficient. In particular, these systems involve a large number of electrically driven fan motors mounted across a wing that induce vibrations that negatively affect the aircraft’s stability. These vibrations cause problems regardless of whether the motors are bottom-mounted, top-mounted, or wing-embedded.

Posted in: Briefs, Motors & Drives

Read More >>

Micropulse Detonation Rocket Engine for Nano-Satellite Propulsion

Goddard Space Flight Center, Greenbelt, Maryland An efficient propulsion system would use a micropulse detonation rocket engine (–PDRE) for nano-satellite maneuverability in space. Technical objectives are to design, build, and conduct a small detonation tube experiment in order to explore the feasibility of using –PDRE for propelling a nano-satellite. The plan is to study the requirement and predict the performance of –PDRE using various candidate propellants, as well as to conduct ground experiments, demonstrate useful thrust, and measure the specific impulse in a two-year time frame, so that a follow-on project can be proposed in a future NRI Center Innovation Fund.

Posted in: Briefs, TSP

Read More >>

Experimental Testbed for 1-MW Turboelectric Distributed Propulsion Aircraft

A low-cost glider design mitigates risk in conducting experiments for cutting-edge “green” aircraft concepts. Armstrong Flight Research Center, Edwards, California Researchers at NASA’s Armstrong Flight Research Center are developing a concept aircraft for testing turbo-electric distributed propulsion (TeDP) experiments. TeDP generally involves providing thrust to an aircraft via wing-mounted ducted electric fans, which consist of an electric motor, a fan, stators, and other components surrounded by cylindrical ducting within a fan case. The fan motors are powered by a combined battery and turboelectric generator system. To sufficiently power an aircraft approximately 50 ft (≈15 m) in length and with a gross weight of 25,000 lb (≈11,340 kg), this system must be capable of generating 1 MW of power.

Posted in: Briefs, Aviation, Motors & Drives

Read More >>

Propellant Loading Visualization Software

Monitoring of complex propulsion pressure systems has been simplified with colors. Goddard Space Flight Center, Greenbelt, Maryland Complex pressure systems are utilized during testing in the propulsion branch as well as during the propellant loading stage of a mission. Keeping track of the state of such a system becomes more difficult as the complexity of such a system increases, and when extensive procedures are being followed. A book-keeping system is needed for visualizing these complex systems.

Posted in: Briefs, TSP

Read More >>

Google Glass for Industrial Automation

A new concept uses Google Glass for operating machinery, with all of the benefits delivered by wearable computing in an industrial environment. With Google’s Web-enabled glasses, status or dialog messages can be projected via a head-up display directly into a person’s field of vision. Online information and communication is also possible with this innovative device, and error messages can be acknowledged using a touchpad.

Posted in: Articles, Optics, Machinery & Automation

Read More >>

Energy Efficiency in Machine Tools

Discussions of the efficient use of energy have become more frequent in many sectors of industry. Machine tools comprise numerous motors and auxiliary components whose energy consumption can vary strongly during machining. The main spindle drive, for example, and the coolant system work near their rated power during roughing with a high stock removal rate, while the power consumption during finishing is significantly lower. There is a very close interdependence between the individual components and subassemblies of a machine tool and aspects of productivity and quality. From a detailed examination of manufacturing processes to the power consumption of individual components, potential for savings can be evaluated and measures can be defined for the efficient use of energy.

Posted in: Application Briefs, Articles, Energy Efficiency, Motors & Drives, Machinery & Automation

Read More >>

White Papers

The Sun’s Surface in Stunning Detail
Sponsored by mikrotron
How to Maximize Temperature Measurement Accuracy
Sponsored by VTI Instruments
Piezo Motors Power MRI Robot
Sponsored by micromo
An Introduction to Stress Analysis and Transducer Design Using Strain Gauges
Sponsored by HBM
All About Aspheric Lenses
Sponsored by edmund optics
Software Defined Radio Handbook
Sponsored by Pentek

White Papers Sponsored By: