Hull Vibration Monitoring System

Brüel & Kjær
Nærum, Denmark
+45 7741 2000
For more info click here

BAE Systems has awarded Brüel & Kjær a Design Development Agreement to deliver a Hull Vibration Monitoring System (HVME) for the UK Royal Navy's Type 26 Global Combat Ship (T26 GCS).

Posted in: Application Briefs, Products, Aerospace, Defense, Sensors and actuators, Sensors and actuators, Vibration, Vibration, Marine vehicles and equipment

3D Printed Primary Flight Control Component

Liebherr-Aerospace & Transportation SAS
Toulouse, France
+49 8381 46 4403
For more info click here

Airbus recently successfully flew Liebherr-Aerospace's 3D printed spoiler actuator valve block on a flight test A380. It was the first 3D printed primary flight control hydraulic component flown on an Airbus aircraft.

Posted in: Application Briefs, Aerospace, Defense, Flight control actuators, Flight control actuators, Suppliers, Additive manufacturing, Parts

F-16 Upgrades

Lockheed Martin
Bethesda, MD
For more info click here

The U.S. Air Force recently authorized extending the service life of the Lockheed Martin F-16's designed service life to 12,000 Equivalent Flight Hours — far beyond the aircraft's original design service life of 8,000 hours.

Posted in: Application Briefs, Aerospace, Defense, Suppliers, Military aircraft

NeXtRAD SDR Interface

Pentek, Inc.
Upper Saddle River, NJ
For more info click here

NeXtRAD is a dual-band, dual-polarization, multistatic radar system under development at the University of Cape Town (UCT) in collaboration with University College London (UCL). The primary mission of the system is to collect multistatic data of small radar cross-section maritime targets embedded in sea clutter.

Posted in: Application Briefs, Aerospace, Defense, Radar, Radar, Suppliers

Using System Simulation to Manage Increasing Thermal Loads on Aircraft Fuel Systems

Today’s modern military fighter jets are like “a flying thermos bottle” according to Steve Iden, AFRL Invent Program Manager [1]. Many engineers have been saddled with trying to put the thermal loading constraints of these fighter jets on ice. This places increasing demands on utilizing the fuel system as a heat sink to dissipate thermal loads coming from onboard electronics, oil and hydraulic systems, avionics bay cooling, and weapons modules. Engineers today are looking to simulation to help tackle these design challenges, and they have more power than ever with simulating fuel systems to evaluate feasible system designs with given requirements on thermal power loading, fuel capacity, and tank geometry. With a given set of key performance metrics and limits on a design, the design space can be quickly explored to find optimum metrics such as flight mission duration or required component sizing to meet thermal load requirements.

Posted in: Articles, Aerospace, Defense, Computer simulation, Thermal management, Thermal management, Fuel systems, Military aircraft

Ensuring the Compliance of Avionics Software with DO-178C

Given the needs to meet the most stringent requirements for reliability, safety, and security resulting in lengthy software development schedules, aerospace and defense projects have become among the most challenging to complete. In response to the increasing size and complexity of software used in airborne systems, the guidance document for certifying such systems has gone through numerous revisions with the latest being DO-178C.

Posted in: Articles, Aerospace, Defense, Avionics, Computer software / hardware, Computer software and hardware, Avionics, Computer software / hardware, Computer software and hardware, Certification

Microwave Photonic Notch Filter

Helps Ensure Critical Mission Success

Interference mitigation is crucial in modern radio frequency (RF) communications systems with dynamically changing operating frequencies, such as cognitive radios, modern military radar, and electronic warfare (EW) systems. To protect sensitive RF receivers in these systems, frequency agile RF filters that can remove interferers or jammers with large variations in frequency, power, and bandwidth are critically sought. Unfortunately, an RF bandstop or notch filter that can simultaneously provide high resolution, high peak attenuation, large frequency tuning, and bandwidth reconfigurability does not presently exist. Microwave photonic (MWP) filters are capable of tens of gigahertz tuning and have advanced in terms of performance, but most are limited in stopband rejection due to the challenge in creating a high-quality-factor optical resonance used as the optical filter. To achieve MWP filters with similar performance to state-of-the-art RF filters in terms of isolation bandwidth and rejection is still very challenging, especially in compact integrated photonic chip footprint.

Posted in: Articles, Aerospace, Defense, Radar, Telecommunications systems, Waveguides, Radar, Telecommunications systems, Waveguides

Measuring Propellant Stress Relaxation Modulus Using Dynamic Mechanical Analyzer

New testing technique requires less material, gives more accurate results.

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, TSP, Aerospace, Defense, Fluid Handling, Propulsion, Solid propellants, Spacecraft fuel, Performance tests

Combustion Characteristics of Hydrocarbon Droplets Induced by Photoignition of Aluminum Nanoparticles

Test methodology allows analysis of combustion dynamics for subscale rocket injectors under super critical conditions.

In the study of combustion characteristics of liquid rocket fuels, it is customary to either study the combustion of liquid fuel droplets or the combustion of fuel sprays. However, the two are closely related to each other, because in a typical rocket combustion chamber, the burning of droplets, droplet clusters, and fuel sprays occur simultaneously.

Posted in: Briefs, TSP, Aerospace, Defense, Propulsion, Test & Measurement, Spacecraft fuel, Aluminum, Combustion and combustion processes, Liquid propellant rocket engines

Vapor Pressure Data and Analysis for Selected Organophosphorous Compounds: DIBMP, DCMP, IMMP, IMPA, EMPA, and MPFA

Determining the thermophysical properties of chemical warfare agent simulants can help evaluate the performance of defensive equipment.

Knowledge of the physical properties of materials is critical for understanding their behavior in the environment as well as in the laboratory. Vapor pressure is an important physical property for a wide variety of chemical defense-related applications, including estimation of persistence, prediction of downwind time-concentration profiles after dissemination, generation of controlled challenge concentrations for detector testing, evaluation of toxicological properties, and assessment of the efficiency of air filtration systems.

Posted in: Briefs, TSP, Aerospace, Defense, Disaster and emergency management, Emergency management, Chemicals, Materials properties, Hazardous materials