Keyword: Gears

Briefs: Mechanical & Fluid Systems

Gear bearings are conceptual mechanical components so named because they function as gears and as roller and/or thrust bearings. Gear bearings will be essential components of the next generation...

Briefs: Photonics/Optics

A proposed lightweight, micromachined, multiaxis-steerable mirror would have mesoscopic dimensions. Its steering function would involve mesoscopic positional excursions of its support points and would be...

Briefs: Motion Control

The figure depicts a mechanism that is capable of simultaneously rotating as many as six disposable bioreactor chambers about horizontal axes. The particular bioreactor chambers for...

Briefs: Mechanical & Fluid Systems
Lightweight, Low-Backlash Robot Wrist With Epicyclic Drive

A unique lightweight wrist with three degrees of rotational freedom has been developed as a prototype of wrists for future anthropomorphic robots that would perform a variety of tasks on Earth and in outer space. The three degrees of freedom (two rolling, one bending) intersect at the...

Briefs: Information Technology
Coherent Phase Line Enhancer: a Method of Spectral Analysis

The term "coherent phase line enhancer" (CPLE) refers to a dual-transform method of spectral analysis that enhances the detection of periodic and quasi-periodic signals buried in wide-band noise. The CPLE is particularly useful for increasing the signal-to-noise ratios of spectral peaks...

Briefs: Photonics/Optics

A compact two-axis scanning-mirror assembly (see figure) has been developed for use as part of a laser rangefinder on a robotic vehicle. The assembly is designed to enable scanning of the laser...

Briefs: Software
Program for Analyzing Static Transmission Error of Helical Gears

The computer program HeliStat performs finite-element analysis to simulate meshing of helical gears. This program is a logical extension of the program DANST, which applies to spur gears. [DANST was described in "Computing Stresses in Spur Gears (LEW-15420), NASA Tech Briefs, Vol....

Briefs: Physical Sciences
Tribology for Aerospace Applications

"Tribology for Aerospace Applications" is a textbook and reference source written for designers of rotating machinery; users and designers of such mechanical components as bearings, gears, and seals; tribologists; university and industrial researchers; and students of machine design. The book incorporates...

Briefs: Mechanical & Fluid Systems

An improved mechanism has been devised to facilitate the adjustment of tension in a cable in a cable-and-pulley drive. Cable-and-pulley drives are being used increasingly in robots and other...

Briefs: Robotics, Automation & Control

An electromechanical device called the "Dexterous Master" (DM) is an exoskeletal mechanism that is worn on a human operator's hand for (1) measuring the positions and orientations of the...

Briefs: Motion Control
Biomorphic Robot With Distributed Power

The biomorphic robot with distributed power (BIROD) is a prototype of a class of robots that will contain simple, reliable distributed actuators that will consume power from local sources - a design concept inspired in part by biological actuators like muscles in limbs. The BIROD concept stands in...

Briefs: Robotics, Automation & Control

An electromechanical device implements a unique method of actuating a fabric joint in an inflatable structure  in particular, the joint in an astronaut's pressure suit. The method is...

Briefs: Motion Control

Servomotor drive manufacturers agree that the performance of today's digital drive is largely determined by the performance of its feedback device. Clearly, previous feedback solutions, such as...

Briefs: Robotics, Automation & Control
Development of Gear Technology and Theory of Gearing

A NASA Reference Publication discusses gear technology from mathematical and historical perspectives. Following a preface containing historical and philosophical observations, the first of three chapters presents mathematical details of the theory of gearing, including recent developments...

Briefs: Motion Control

The linear motor was invented in the mid-nineteenth century, at much the same time as its brother, the rotating electric motor. Because the linear motor always has to effect a reversing movement -...

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: Motion Control

Harmonic drive gearing is recognized by designers for its zero backlash, high gear ratios, and compact design features. A recent development by HD Systems incorporates a large hollow shaft...

Briefs: Motion Control

Two types of gear drives have been devised to improve the performances of robotic mechanisms. One type features a dual-input/single-output differential-drive configuration intended to...

Briefs: Mechanical & Fluid Systems
Updated Program for Computing Stresses in Spur Gears

DANST-PC is version 3.01 of a computer program for analysis of the statics and dynamics of spur-gear systems. ["DANST" signifies "Dynamic Analysis of Spur Gear Transmissions." A previous version was described in "Computing Stresses in Spur Gears," NASA Tech Briefs, Vol. 19, No. 12 (December...

Briefs: Motion Control

A design has been developed for manufacturing multispeed transmissions that are small enough to be used with minimotors - electromagnetic motors with power ratings of less than 1 W. Like...

Briefs: Mechanical & Fluid Systems
Briefs: Software
Software for Tooth-Contact Analysis of Spiral Bevel Gears

The SBGTAPER computer program implements a method for design and generation of spiral bevel gears that feature tapered teeth with localized bearing contact and a low level of transmission errors. The influence of misalignment on transmission errors and shift of bearing contact were...

Briefs: Mechanical & Fluid Systems
Wheel Drive of Mars Rover

A brief report summarizes the design of the lightweight, high-torque wheel drive of a small robotic vehicle used to explore the surface of Mars. Planetary gearing was selected for compactness and high torque capability. The input stages were fitted with ball bearings to survive the cold (down to -100 °C) Martian...

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