Test & Measurement

Damping Measurement for Wafer-Level Packaged MEMS Acceleration 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

Digital Meter

The New Technology Meter (NTM) from OTEK (Tucson, AZ) has everything you need to measure and control your process while operating with less than 50mW of power. OTEK’s NTM boasts a full tricolor bargraph with 2% resolution and four alarm set points. The NTM includes isolated Serial I/O, isolated O.C.T. or SPDT relays and isolated analog output with P or PID algorithm. OTEK has included signal failure (open or short) detection with date and time transmission. The meter is available in over 30 different input signals. It is also available in loop or signal powered versions, but feature restrictions apply.

The NTM-9 replaces fit, form and function any 6" × 1.74" panel cut-out and has up to two channels. The meter is available in an industrial plastic or a metal housing and can meet nuclear or military grades.

For Free Info Visit http://info.hotims.com/55588-515

Posted in: Products, Defense, Consumer Product Manufacturing, Measuring Instruments

Advancing the Use of Beryllium Bearing Materials for Unmanned Platforms

Aerospace and defense platforms are often regarded as the earliest adopters of new materials and processes technologies. Materials test programs provide validations of material supplier property claims, as the physical tests are performed and data is analyzed. Resultant material “design allowables” are developed and compared to the performance envelopes for the intended application(s). The quality of simulation software and the developed knowledge base that design and strength engineering personnel use for analyzing materials in the intended product design and environments have improved dramatically in the last decade. This has primarily been based on the efficiency and availability of computing capacity for complex simulations.

Posted in: Articles, Aerospace, Defense, Materials, Simulation Software, Test & Measurement, Beryllium alloys, Unmanned aerial vehicles

Testing Reality in an Increasingly Complex Design Space

The universal adoption of digital 3-D design tools has truly changed forever the way that advanced products are created, from original concept studies, development, testing, and manufacturing, right through the lifecycle to maintainability, future enhancement, and long-term support. The ability to share detailed specifications and test data between all partners worldwide, but with controlled access as required throughout the supply chain, enables large and small suppliers to work to common standards and requirements, maintaining the same data accuracy across the network. This has not only saved valuable time, helping to reduce costs, but has brought about higher standards of product quality and, importantly, more traceability, providing a clear picture for project managers who have access in real time to progress at all levels.

Posted in: Articles, Aerospace, Defense, Simulation Software, Test & Measurement, Design processes, Simulation and modeling, Test procedures, Aircraft

Reduced Order Modeling for Rapid Simulation of Blast Events of a Military Ground Vehicle and its Occupants

Improvised Explosive Devices (IEDs) pose a significant threat to military ground vehicles and soldiers in the field. Full-system end-to-end models, as well as Reduced Order Modeling and Simulation (M&S) methodologies, are extensively used for the development of blast-worthy ground vehicles.

Posted in: Briefs, Aerospace, Defense, Electronics & Computers, Information Technology, Test & Measurement, Computer simulation, Hazards and emergency management, Injuries, Military vehicles and equipment

Software Tool Enables High-Fidelity Simulation of Explosive Device Effects

High-fidelity simulation tools are used as an acceptable surrogate for real-world tests. These tools accelerate development and reduce cost, while informing weapons development and systems survivability for defense and homeland security applications. As weapons grew in complexity, analytical methods became insufficient and high-fidelity computational methods became necessary.

Posted in: Briefs, Aerospace, Defense, Simulation Software, Software, Test & Measurement, Computer simulation, Hazards and emergency management

Magnetic Field Lines Made Visible in 3-D and Real Time

Scientists at the Fraunhofer Institute have developed a high-resolution magnetic line camera to measure magnetic fields in real time, which is particularly useful for quality assurance during the manufacture of magnets. Read more at http://articles.sae.org/13706.

Posted in: Articles, News, Aerospace, Defense, Cameras, Manufacturing & Prototyping, Measuring Instruments

Comparing Blade-Element Momentum Modeling to 3-D CFD

Many small unmanned aerial vehicles (SUAVs) are driven by small-scale fixed-blade propellers, and the flow produced by the propeller can have a significant impact on the aerodynamics of the SUAV itself.

Small unmanned aerial vehicles (SUAVs) are becoming increasingly popular for surveillance and numerous other applications. These SUAVs come in various sizes, and the smallest are referred to as micro aerial vehicles (MAVs). For purposes here, SUAV will be used to refer to all UAVs that are portable by a man.

Posted in: Articles, Aerospace, Defense, Test & Measurement, Computational fluid dynamics, Computer simulation, Unmanned aerial vehicles

Thermal Simulation and Testing of Expanded Metal Foils for Lightning Protection

With the implementation of major aircraft structures fabricated from carbon fiber reinforced plastic materials, lightning protection has become a more complicated issue for designers and engineers to solve.

Cracking of coatings and surface layers is evident on a variety of structures including buildings, automobiles, and aircraft. In some situations, the appearance of the coated or painted surface is degraded and the aesthetic appeal is lessened. However, in others, such as composite aircraft structures, paint cracking is both aesthetically undesirable and potentially deleterious from the electromagnetic effects aspect.

Posted in: Articles, Aerospace, Defense, Materials, Test & Measurement, Computer simulation, Coatings Colorants and Finishes, Composite materials, Lightning protection, Thermal testing