Keyword: Propellers and rotors

Articles: Electronics & Computers
Learn the differences between bipolar and unipolar motors, their driving methods, and advantages and limitations.
Briefs: Sensors/Data Acquisition
Early flutter detection will help in the development of safer and more eco-friendly aircraft turbines.
Briefs: Mechanical & Fluid Systems
The new hinge is the key to get loadbearing, large quadrotors to climb a few dozen feet in seconds.
Briefs: Energy
The material can be recycled, making renewable energy more sustainable while lowering costs in the process.
Briefs: Robotics, Automation & Control
Onboard cameras can be used to keep damaged quadcopters in the air and flying stably, even without GPS.
Briefs: Motion Control
NASA's phase-locked rotors reduce noise.
Briefs: Aerospace
Neural Lander Uses AI to Land Drones Smoothly

Landing multi-rotor drones smoothly is difficult. Complex turbulence is created by the airflow from each rotor bouncing off the ground during a descent. This turbulence is not well understood nor is it easy to compensate for, particularly for autonomous drones. That is why takeoff and landing are...

Briefs: Motion Control

There is great potential in using both drones and ground-based robots for situations like disaster response, but generally these platforms either fly or creep along the ground. The flying...

Briefs: Aerospace
Device for Providing Real-Time Rotorcraft Noise Abatement Information

Rotorcraft typically operate near the ground throughout the duration of the operation. For this reason, military rotorcraft are vulnerable to acoustic detection, and public acceptance of civil rotorcraft is limited by annoyance caused by rotor noise radiation. The purpose of...

Briefs: Aerospace

NASA's Langley Research Center has developed an unmanned aerial vehicle concept for long-range, distributed aerial presence and delivery applications. This aircraft concept is capable...

Briefs: Manufacturing & Prototyping
A New Twist Makes Rotating Machinery More Efficient and Quieter

Derived from a design approach for a new wing known as PRANDTL-D, this technology achieves similar improvements for propellers and other rotating machinery.

Briefs: Test & Measurement

The giant rotor blades are one central part of a wind turbine. Researchers developed a rotor blade that makes more efficient use of large fluctuations in wind strength using...

Briefs: Aerospace

NASA Langley Research Center, in collaboration with Boeing and Lockheed Martin, has developed a new external acoustic liner for aircraft noise reduction. While the acoustic liner can be placed on any...

Briefs: Robotics, Automation & Control

SIMbot is an updated version of the ballbot, an elegantly simple robot whose tall, thin body moves on top of a sphere slightly smaller than a bowling ball. SIMbot features a motor with just...

Briefs: Mechanical & Fluid Systems

This actuator was developed out of a need for a cryogenic actuator that can operate effectively in spite of the thermal mismatch involved with construction materials that have different...

Briefs: Mechanical & Fluid Systems
MEMS Micro-Translation Stage with Large Linear Travel Capability

A MEMS (microelectromechanical systems) micro-translation stage (MTS) with large linear travel capability was developed that uses capacitive electrostatic forces created by stators arranged linearly on both sides of a channel, and matching rotors on a moveable shuttle for precise...

Articles: Robotics, Automation & Control

Permanent magnet brushless motors of various design architectures and power levels have been used since the late 1980s in industrial and commercial applications. Over the course...

Briefs: Manufacturing & Prototyping
Flap Edge Noise Reduction Fins

Aircraft noise is a significant problem with both economic and public health implications, especially for communities near airports. As a result, increasingly stringent constraints are being placed on aircraft carriers worldwide to reduce this noise. The current disclosure focuses on airframe noise generated at or...

Briefs: Mechanical & Fluid Systems

Machine vibration often originates with rotating driveline components such as rotors, gears, bearings, and fans. Such vibration is the source of unwanted noise and can be destructive to the machine. The vibration ring is a...

Briefs: Test & Measurement

Permanent magnet machines are used in many industrial applications because of their ability to produce high power densities. The market for such machines has been...

Articles: Robotics, Automation & Control

Designers of medical pumps often have to deal with the challenge of implementing precise, yet low-cost motion control. For most medical pumps, there are three basic technology...

Briefs: Physical Sciences
Anomaly Detection Techniques With Real Test Data From a Spinning Turbine Engine-Like Rotor

Online detection techniques to monitor the health of rotating engine components are becoming increasingly attractive to aircraft engine manufacturers in order to increase safety of operation and lower maintenance costs. Health monitoring remains a...

Briefs: Mechanical & Fluid Systems
Implementation of a Non-Metallic Barrier in an Electric Motor

Electric motors that run in pure oxygen must be sealed, or “canned,” for safety reasons to prevent the oxygen from entering into the electrical portion of the motor. The current canning process involves designing a metallic barrier around the rotor to provide the separation. This...

Briefs: Mechanical & Fluid Systems
Two-Stage Centrifugal Fan

Fan designs are often constrained by envelope, rotational speed, weight, and power. Aerodynamic performance and motor electrical performance are heavily influenced by rotational speed. The fan used in this work is at a practical limit for rotational speed due to motor performance characteristics, and there is no more...

Briefs: Mechanical & Fluid Systems
Levitated Duct Fan (LDF) Aircraft Auxiliary Generator

This generator concept includes a novel stator and rotor architecture made from composite material with blades attached to the outer rotating shell of a ducted fan drum rotor, a non-contact support system between the stator and rotor using magnetic fields to provide levitation, and an...

Briefs: Mechanical & Fluid Systems
Planar Rotary Piezoelectric Motor Using Ultrasonic Horns

A motor involves a simple design that can be embedded into a plate structure by incorporating ultrasonic horn actuators into the plate. The piezoelectric material that is integrated into the horns is pre-stressed with flexures. Piezoelectric actuators are attractive for their ability to...

Briefs: Mechanical & Fluid Systems
Acoustic Liner for Turbomachinery Applications

The purpose of this innovation is to reduce aircraft noise in the communities surrounding airports by significantly attenuating the noise generated by the turbomachinery, and enhancing safety by providing a containment barrier for a blade failure. Acoustic liners are used in today’s turbofan...

Briefs: Mechanical & Fluid Systems
Investigating Dynamics of Eccentricity in Turbomachine

A methodology (and hardware and software to implement the methodology) has been developed as a means of investigating coupling between certain rotordynamic and hydrodynamic phenomena in turbomachines. Originally, the methodology was intended for application in an investigation of coupled...

Articles: Robotics, Automation & Control

In 1938, General Electric began producing a two-phase synchronous induction motor which, at 60 Hz, ran at 75 RPM. The low speed resulted from using a different number of rotors to stator poles or teeth, which...