Mechanical Components

Educating UGVs

Advancements in the field of artificial intelligence (AI) are accelerating as the technology matures from being research-orientated to being deployed in a wide range of products and services, such as autonomous vehicles. While Convolutional Neural Networks (CNNs) were first described in the 1950s, the technology remained an academic concept until the availability of large training data sets and powerful Graphics Processor Units (GPUs), a processor architecture ideal for the heavy math computational demands associated with neural network processing. Once scientists had low-cost and high-performance platforms, the technology exploded for many commercial uses. Military use is more challenging due to the lack of large data sets, but that is changing too as areas including thermal imagery are starting to be used.

Posted in: Articles, Aeronautics, Aerospace, Aviation, Data Acquisition, Computers, Electronics & Computers, PCs/Portable Computers, Thermal Management, Imaging, Machine Vision, Visualization Software, Machinery, Data Acquisition
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Inertial Measurement Unit

Silicon Sensing Systems Ltd.
Plymouth, UK
+44 0 1752 723330
www.siliconsensing.com

Silicon Sensing Systems Ltd's latest DMU30 inertial measurement unit (IMU) has been chosen to provide highly accurate ship's attitude data to the autopilot that will navigate the ground-breaking Mayflower Autonomous Ship (MAS 400) as it travels the world.

Posted in: Application Briefs, Defense, Mechanical Components, MEMs, Detectors, Sensors
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New Products: February 2018 Aerospace & Defense Technology

Rugged Servers with Skylake Architecture

Themis Computer® (Fremont, CA) announced the launch of its next generation XR6 Rugged Enterprise Servers (RES) featuring the newest Intel® Xeon® Scalable (Skylake) Processors.

Posted in: Products, Aeronautics, Aviation, Data Acquisition, Defense, Board-Level Electronics, Computers, Electronic Components, Electronics, Electronics & Computers, Power Management, Power Supplies, Cameras, Imaging, Fastening, Joining & Assembly, Machinery, Mechanical Components
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Plain Bearings for Aerospace Applications

Plain bearings are used across a wide range of aerospace applications to help achieve better fuel efficiency, extend maintenance intervals, and lower carbon emissions. These applications include installation in aircraft wing systems (flaps, spoilers, and slats), flight controls, cockpit controls, auxiliary power units, landing gear, door systems, and aircraft interiors (seats, bins, latches, and hinge points). “Our plain bearings even have a footprint on Mars,” said Brett Ricci, GGB Aerospace Strategic Account Manager for North America. “Operating in temperatures between -200°C to +280°C, our plain bearings have served as the primary suspension components in the robotic drilling arm of NASA’s Curiosity Mars Rover since 2012.”

Posted in: Articles, Aerospace, Fastening, Joining & Assembly, Machinery, Mechanical Components, MEMs, Aircraft structures, Suppliers, Bearings, Spacecraft
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Unique Method for Orifice Production

To produce accurate, repeatable orifices, all the variables that might influence the Cd Value (Coefficient of Discharge) must be controlled during production. This includes the orifice hole length, edges, surface finishes, roundness and the elimination of all tool marks, burrs, ragged edges and irregularities. If any one of these areas is not perfectly managed, the orifice flow rates will vary from piece to piece thereby making it impossible to predict flow with any accuracy.

Posted in: White Papers, White Papers, Mechanical Components, Mechanics
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Measuring Propellant Stress Relaxation Modulus Using Dynamic Mechanical Analyzer

Structural analysis of solid rocket motors is challenging for several reasons, but the most important of these is the complex behavior of the propellant. The mechanical response of a solid propellant is time and temperature dependent. The complexity of the mathematical analysis of the propellant depends on the loading conditions, but for some loading situations, the linear viscoelasticity assumption is reasonable. In particular, linear viscoelasticity is perhaps the most appropriate material behavior description for use in the simulations of stresses related to storage conditions. Typically, simulations use a viscoelastic model in the form of a Prony series and a Williams–Landel–Ferry (WLF) equation. The parameters in these models are derived from stress relaxation experiments, making the stress relaxation experiment a key viscoelastic test, analogous to the tensile test for linear elastic materials.

Posted in: Briefs, Aerospace, Defense, Fluid Handling, Propulsion, Solid propellants, Spacecraft fuel, Performance tests
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Non-Destructive Damping Measurement for MEMS Acceleration Switches

Microelectromechanical systems (MEMS) three-axis acceleration threshold sensors have been developed to measure acceleration threshold levels using voltage switching when the threshold is reached. Switches with different damping coefficients result in different mechanical impedances and response times. Analytical and numerical methods to model damping coefficient values based on empirical data are needed to characterize three-axis acceleration sensors; traditional methods use the displacement of an underdamped system to calculate the damping ratio.

Posted in: Briefs, Aerospace, Defense, Mechanical Components, Simulation and modeling, Sensors and actuators, Switches
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Damping Measurement for Wafer-Level Packaged MEMS Acceleration Sensors

Two methods were developed for mechanical analysis of MEMS sensors.

Microelectromechanical system (MEMS) three-axis acceleration threshold sensors have been developed to measure acceleration threshold levels using voltage switching when the threshold is reached. Determining damping coefficients is important for categorizing how each threshold sensor or switch operates. Switches with different damping coefficients result in different mechanical impedances and response times. Analytical and numerical methods to model damping coefficient values based on empirical data are needed to characterize three-axis acceleration sensors; traditional methods use the displacement of an underdamped system to calculate the damping ratio.

Posted in: Briefs, Defense, MEMs, Sensors, Measuring Instruments, Sensors and actuators, Switches
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Flange Couplings

RINGFEDER POWER TRANSMISSION (Westwood, NJ) has announced the launch of its new RfN 5571 series flange coupling for heavy industry. RINGFEDER® flange couplings provide a superior solution to standard press fits. Equipped with the Ringfeder Shrink Disc this new series eliminates the needs for additional components such as keyways or shims. Eliminating the need for heating and cooling of the part reduces installation complexity. RINGFEDER® flange couplings are slip fit with frictional engagement achieved by torqueing the shrink disc screws. Available with hexagon head screws or hexagon socket head cap screws. Some of the advantages provided by this system are: a stronger connection than keyway systems, no wear parts, higher torque carrying capacity, backlash-free shaft hub connection, and a high level of true running accuracy.

For Free Info Visit http://info.hotims.com/55588-514

Posted in: Products, Defense, Consumer Product Manufacturing, Joining & Assembly
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3-D Manufacturing of Titanium Components Takes Off

MRO providers are discovering ways to innovate their procedures while remaining viable and profitable through the current downturn in government spending. Read more at http://articles.sae.org/13268.

Posted in: Articles, Aerospace, Defense, Mechanical Components
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