Stories
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Briefs: Software
The first step of pattern matching always includes a learning process. A “gold” master is used to create a template. This template is used for identification purposes on all...
Articles: Motion Control
Force/Torque (F/T) sensors are critical components of robotic applications in electrical and mechanical assembly, product testing, material handling, and many other applications. A sensor system helps robots verify...
Briefs: Mechanical & Fluid Systems
Energy savings is one of the key ingredients in reducing costs for any manufacturing operation. A simple, but very effective, way to save energy is by making fans run more...
Briefs: Motion Control
Standard induction motors, normally designed to run at base speeds between 850 to 3500 rpm, are not particularly well suited for low-speed operation, as their efficiency...
Briefs: Motion Control
An improved method has been devised for the computational prediction of a collision between (1) a robotic manipulator and (2) another part of the robot or an external object in the...
Briefs: Mechanical & Fluid Systems
Small, Untethered, Mobile Robots for Inspecting Gas Pipes
Small, untethered mobile robots denoted gas-pipe explorers (GPEXs) have been proposed for inspecting the interiors of pipes used in the local distribution natural gas. The United States has network of gas- distribution pipes with a total length of approximately 109 m. These pipes are often...
Briefs: Motion Control
A proposed inchworm actuator, to be designed and fabricated according to the principles of microelectromechanical systems (MEMS), would effect linear motion characterized by steps as...
Briefs: Information Technology
A proposed method of processing the outputs of multiple gyroscopes to increase the accuracy of rate (that is, angular- velocity) readings has been developed theoretically and...
Briefs: Mechanical & Fluid Systems
The torque-limited touchdown bearing system (TLTBS) is a backup mechanical- bearing system for a high-speed rotary machine in which the rotor shaft is supported by magnetic bearings in...
Briefs: Motion Control
An improved method and prior methods of deadbeat direct torque control involve the use of pulse-width modulation (PWM) of applied voltages. The prior methods are based on the use of stator...
Briefs: Motion Control
A precision piezoelectric positioning system with high-bandwidth and high-power enables a new class of precision machining called Vibration Assisted Machining. The actuator and...
Briefs: Motion Control
Surface-acoustic-wave (SAW) piezoelectric motors of a proposed type would be capable of operating in multiple degrees of freedom (DOFs) simultaneously and would be amenable to integration into...
Briefs: Motion Control
A feedback position-control system has been developed for maintaining the concentricity of a turbofan with respect to a nacelle during acoustic and flow tests in a wind tunnel. The...
Briefs: Robotics, Automation & Control
Lightweight, Self-Deployable Wheels
Ultra-lightweight, self-deployable wheels made of polymer foams have been demonstrated. These wheels are an addition to the roster of cold hibernated elastic memory (CHEM) structural applications. Intended originally for use on nanorovers (very small planetary-exploration robotic vehicles), CHEM wheels could also...
Briefs: Robotics, Automation & Control
Hopping Robot With Wheels
A small prototype mobile robot is capable of (1) hopping to move rapidly or avoid obstacles and then (2) moving relatively slowly and precisely on the ground by use of wheels in the manner of previously reported exploratory robots of the "rover" type. This robot is a descendant of a more primitive hopping robot described...
Briefs: Motion Control
Grease-Resistant O Rings for Joints in Solid Rocket Motors
There is a continuing effort to develop improved O rings for sealing joints in solid-fuel rocket motors. Following an approach based on the lessons learned in the explosion of the space shuttle Challenger, investigators have been seeking O-ring materials that exhibit adequate resilience for...
Briefs: Motion Control
Linear back-drive differentials have been proposed as alternatives to conventional gear differentials for applications in which there is only limited rotational motion (e.g., oscillation). The finite nature of...
Briefs: Motion Control
An eight-pole radial magnetic bearing has been modified into a switched-reluctance electric motor capable of operating at a speed as high as 8,000 rpm at a temperature as high as 1,000 °F...
Briefs: Information Technology
A strategy for autonomous navigation of a robotic vehicle across hazardous terrain involves the use of a measure of traversability of terrain within a fuzzy-logic conceptual framework....
Briefs: Robotics, Automation & Control
Fail-safe electromagnetic motor brakes are undergoing development for use in joints of robot arms. The brakes are needed for both static holding and emergency stopping. In the present context, "fail-safe"...
Briefs: Robotics, Automation & Control
Figure 1 depicts a mechanical linkage that converts rotational motion about three base joints (A, B, and C) to translational motion of an end effector (D) in three dimensions. The linkage is...
Briefs: Robotics, Automation & Control
A compact conical roller clutch can be either (1) engaged to obtain both positive locking against rotation in one sense and freewheeling in the opposite sense or (2) disengaged to obtain free...
Briefs: Mechanical & Fluid Systems
A proposed lightweight, micromachined winch would have microscopic structural details and mesoscopic overall dimensions and would be capable of generating bidirectional macro- scopic motion...
Briefs: Mechanical & Fluid Systems
Hardware and decentralized-control algorithms have been developed during continued research on the sensors, the actuators, and the design and functional requirements for systems of...
Briefs: Motion Control
Electrohydrodynamic (EHD) conduction pumps have been investigated in theoretical and experimental studies. In general, EHD pumps contain no moving parts. They generate pressure gradients and/or flows in...
Briefs: Motion Control
Special gimbal mechanisms and algorithms that implement decentralized compliant control have been developed for use in research on the sensors, the actuators, and the design and functional...
Briefs: Mechanical & Fluid Systems
Magnetostrictive Motor and Circuits for Robotic Applications
A magnetostrictive motor and its drive circuit and control system have been designed to be especially suitable for robotic applications in which there are requirements for precise, high-force linear actuators. The motor includes a laminated armature made of the magnetostrictive alloy...
Briefs: Motion Control
The Rover Analysis Modeling and Simulation (ROAMS) algorithm is to solve the kinematics of a wheeled mo- bile robot (rover) traversing on a rocky terrain. The rover is constructed using...
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