Stay updated on advancements in mechanical components and mechatronics systems. New technologies in MEMs, fluid systems, and propulsion are driving breakthroughs in transportation, electrification, autonomous driving, and manufacturing.

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: Mechanical & Fluid Systems
Computational Test Cases for Oscillating Clipped Delta Wing

Computational test cases have been selected from archived sets of data acquired some years ago in wind-tunnel experiments on a clipped delta wing equipped with a hydraulically actuated trailing-edge control surface. In some of the experiments, the wing was subjected to pitching...

Briefs: Mechanical & Fluid Systems
Control Derivatives of the F-18 Airplane

Flight data gathered by use of the F-18 System Research Aircraft (SRA) based at Dryden Flight Research Center have been used to estimate stability and control derivatives for a baseline F-18 airplane....

Briefs: Mechanical & Fluid Systems
Ultrasonically Induced Fountains and Fogs

Experiments have demonstrated the feasibility of generating fountains and fogs over a body of water (see Figure 1) by utilizing high-intensity ultrasound to induce acoustic streaming, cavitation, and...

Briefs: Mechanical & Fluid Systems
Fail-Safe, Continue-to-Operate Concept for Jackscrews

A fail-safe, continue-to-operate design concept for machine jackscrews calls for the incorporation of a redundant follower nut that would assume the axial jack load upon failure of the...

Briefs: Mechanical & Fluid Systems
Pulse-Tube Refrigerator for Liquid Hydrogen

An improved closed-loop, two-stage pulse-tube refrigerator provides 4 W of cooling power at a temperature of 15 K. The original intended application of this refrigerator is in preventing boiloff of liquid hydrogen from a propellant tank aboard a spacecraft. The basic refrigerator design can also be...

Briefs: Mechanical & Fluid Systems
Ultrasonic/Sonic Vibrating/Rotating Tool Bits

An easy-to-implement design concept shows promise for improving the performances of impact tool bits used in abrading surfaces, drilling, and coring of rock and rocklike materials. The concept is...

Briefs: Mechanical & Fluid Systems
Water-Jet Accelerator for Launching a Spacecraft

A proposed ground- based apparatus would accelerate a spacecraft to speed of about mach 1, thus making it possible to increase the payload and/or reduce the cost of launching the space- craft into orbit. The apparatus would include a track along which the spacecraft would ride on a sled. Hundreds...

Briefs: Mechanical & Fluid Systems
Modular, Highly Maintainable, and Flexible Control Software

Model Rocket Engine Software System (MRECS) is a system of control software that was originally intended for use in controlling rocket engines but is also applicable to almost any real-time, closed- loop process-control system — for example, the feedback control system of a robot....

Briefs: Mechanical & Fluid Systems
Advances in Cooperative Transport by Two Mobile Robots

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...

Briefs: Motion Control
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...

Efforts are underway to develop compact, lightweight electro-mechanical actuators based on electroactive polymers (EAPs). An actuator of this type is denoted an...

Briefs: Mechanical & Fluid Systems
Mechanisms for Reliable One-Time Deployment of Panels

Mechanisms denoted restraint/ release/deployment-initiation (RRDI) devices have been invented to enable the rapid, reliable, one-time deployment of panels that have been hinged together...

Briefs: Mechanical & Fluid Systems
Apparatus for Friction Stir Welding of Pipes

A proposed apparatus would effect friction stir welding (FSW) along a circumferential path to join two pipes. The apparatus is denoted an “orbital FSW system” because the circumferential motion of the FSW head would be similar to the motions of welding heads in commercial orbital fusion welding...

Briefs: Mechanical & Fluid Systems
Automated System for Fluid and Electrical Connections

The Smart Umbilical Mating System (SUMS) is an automated, three-degreeof- freedom, scalable system for quickly mating, demating, and/or remating ganged umbilicals. SUMS connects electrical and fluid paths between spacecraft and ground support equipment whether liftoff or side mount for NON...

Briefs: Mechanical & Fluid Systems
Sonic-Boom Tests of Model of a Supersonic Business Jet Plane

A report discusses wind-tunnel tests of a scale model of a con- ceptual two-engine jet airplane designed to carry 10 passengers, have a range of 4,000 miles (≈6,400 km), cruise at a mach number of 2.0, and generate a low sonic boom [char- acterized by a shock overpressure of ≤ 0.5...

Briefs: Mechanical & Fluid Systems
Optimization of Synthetic Jet Actuators

A report presents a study oriented toward optimization of synthetic jet actuators. [A syn- thetic jet actuator is a fluidic control device that partly resembles a loudspeaker. It typically comprises a piezo- electric actuator/ diaphragm situated in a cavity, facing an orifice or nozzle at the opposite end...

Briefs: Mechanical & Fluid Systems
Hexfoil Rotary Flexures

Hexfoil rotary flexures have been proposed as pivots suitable for use in precise optical instruments. In the application that inspired the hexfoil concept, there is a requirement for a limited-rotation mirror gimbal...

Briefs: Mechanical & Fluid Systems
Improvements in the Use of Water Washes in Testing for NVR

Some improvements have been made to enhance the role of water as a test solvent for determining the amount of hydrocarbon nonvolatile residue (NVR) present on an item of hardware that is required to be totally or nearly devoid of such residue. Water is now used as an NVR-testing solvent...

Briefs: Mechanical & Fluid Systems
Flight Research on Supersonic Laminar Flow

Some airfoil designs have been shown by theory and small-scale tests to be capable of passively maintaining laminar flow at super -sonic speeds. More recently, flight tests have proven that these...

A compact spring-loading design has been proposed to increase the reliability of seals in the joints of vacuum cryogenic systems. Heretofore, such joints have been, variously, compact...

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...

Briefs: Mechanical & Fluid Systems
Crowned Races for Crossed Roller Bearings

Crowned races have been proposed for crossed roller bearings. Crowning of the races is expected to reduce scuffing of the cylindrical rollers. Crowning of the races is expected to be especially...

Briefs: Mechanical & Fluid Systems
Pressure-Balanced, Low-Hysteresis Finger Seal

A second-generation design for a finger seal has been proposed to reduce a hysteretic effect that gives rise to increased leakage in a first-generation finger seal. As explained below, the...

Briefs: Mechanical & Fluid Systems
Instrument for Measuring Extreme Winds

An instrument is undergoing development for use in measuring both the horizontal direction and the horizontal speed of wind in the speed range from 60 to 300 mph (about 27 to 134 m/s) at a rate of at...

Briefs: Mechanical & Fluid Systems
Mechanized Harvesting of Plants in a Controlled Environment

The proposed Plant Harvesting Mechanization System (PHARMS) would comprise machinery and controls for semiautomated harvesting of plants grown in a controlled environment. The PHARMS was conceived as a prototype of harvesters to be incorporated into life-support systems of spacecraft...

Normally, the damage that results in a total loss of the primary flight control of a transport airplane, including all the engines on one side, would be catastrophic. Dryden Flight...

Briefs: Mechanical & Fluid Systems
Tests of Finger Seals

A report discusses tests of finger seals, which were described in “Pressure- Balanced, Low-Hysteresis Finger Seal” (LEW-16840), which appears on page 52 in this issue. Like a labyrinth or brush seal, a finger seal is used (typically in a gas turbine) to minimize a leakage flow along a rotating shaft. The report...

Briefs: Mechanical & Fluid Systems
Design Concepts for the ISS TransHab Module

Twelve reports present concepts for the design of structural and functional systems, subsystems, and components of the proposed TransHab module — an inflatable, lightweight habitation module that would be used by crewmembers of the International Space Station and would serve as a prototype of...

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