Keyword: Helicopters

Briefs: Electronics & Computers
A Topographical Lidar System for Terrain-Relative Navigation

An imaging lidar system is being developed for use in navigation, relative to the local terrain. This technology will potentially be used for future spacecraft landing on the Moon. Systems like this one could also be used on Earth for diverse purposes, including mapping terrain,...

Briefs: Physical Sciences

The Wing and Rotor Aeroelastic Test System (WRATS) data acquisition system (DAS) is a 64-channel data acquisition display and analysis system specifically designed for use with the WRATS 1/5-scale...

Briefs: Physical Sciences

The terminal descent sensor (TDS) is a radar altimeter/velocimeter that improves the accuracy of velocity sensing by more than an order of magnitude when compared to existing sensors. The TDS is designed...

Application Briefs: Electronics & Computers

Increasingly dependent on continuous video monitoring and recording, even today's more sophisticated security surveillance systems are often plagued by reliability...

Briefs: Mechanical & Fluid Systems

system for real-time detection of surface- fatigue-pitting damage to gears for use in a helicopter transmission is based on fuzzy-logic used to fuse data from sensors that measure...

Application Briefs: Robotics, Automation & Control

It is a staple of the summer box office blockbuster: the car chase. Car chases have not only become a vital component of an action movie, they have also had to evolve, with audiences...

Briefs: Mechanical & Fluid Systems

A method of reducing the noise generated by a tilt-rotor aircraft during descent involves active control of the blade pitch of the rotors. This method is related to prior such noise-...

Briefs: Mechanical & Fluid Systems

Columnar-vortex generators (CVG) have been proposed as means to increase the safety of takeoffs and landings of aircraft on aircraft or helicopter carriers and other ships at sea....

Briefs: Mechanical & Fluid Systems

Wavy-planform rotor blades for helicopters have been investigated for the first time in an effort to reduce noise. Two of the main sources of helicopter noise are blade/vortex interaction (BVI)...

Briefs: Photonics/Optics

A versatile electronic timing-and-control unit, denoted a rotorcraft strobe controller, has been developed for use in controlling stroboscopes, lasers, video cameras, and other instruments...

Briefs: Motion Control

Designers of deep submersibles are reluctant to use conventional shafts and seals to penetrate the hulls of deep submersible, pressure vessels fearing seal...

Briefs: Physical Sciences

Improved electrical resistance heaters for preventing the accumulation of ice on aircraft surfaces are undergoing development. The primary intended market for these heaters is that of...

Briefs: Software
Program Uses Terrain-Image Data To Locate Safe Landing Site

A computer program under continuing development strives to locate a safe landing site for a spacecraft through realtime processing of image data acquired by a video camera aimed at the terrain below while the spacecraft descends. The program might also be useful for aiding the selection...

Briefs: Electronics & Computers

A proposed communication antenna for a helicopter would feature radiating elements in or on the blades of the main rotor, with a novel rotary radio-frequency coupling between the antenna and the...

Briefs: Motion Control

Small, instrumented, expendable robotic aircraft and projectiles have been proposed for use in scouting for targeted new sites by providing closeup images with ~10-cm resolution,...

Briefs: Physical Sciences

Small instrumented, free-flying (unpowered) rotary aircraft have been proposed for use in gathering scientific data from hazardous or inaccessible terrain on remote planets as well as on Earth. These aircraft...

Briefs: Photonics/Optics

Infrared-sensor systems for real-time detection of accretion of ice on helicopter rotor blades are undergoing development. By providing early warnings of icing conditions, these...

Briefs: Mechanical & Fluid Systems

The tail boom of a single-rotor helicopter is subjected to a complex flow field that includes the wakes of the main and tail rotors, the freestream, and the wake from the forward...

Briefs: Information Technology

A method for detecting and characterizing faults in a rotating machine involves analysis of selected aspects of the evolution of the spectral distribution function (SDF) of...

Briefs: Information Technology

A method of automated diagnosis of helicopter gearboxes involves processing of selected features of digitized outputs of vibration sensors via structure-based connectionist...