MEMs

Cracking of Aluminum Panels Repaired With Composite Patches

An experimental study of the mechanical behavior of cracked aluminum specimens repaired with composite-material patches has yielded findings that may eventually contribute to the development of more- effective composite patches and of techniques for predicting and detecting failures in composite-patched aluminum aircraft panels. Some prior studies have addressed various aspects of composite-patch repair of aluminum specimens, but until now, little attention has been given to such important aspects of mechanical behavior and properties as the relationships among stress, strain, and growth of cracks through-out the lifetimes of specimens. In this study, effects of initiation and growth of cracks on the residual strengths of the patched specimens were characterized. This study established a correlation among damage modes, residual strengths, and evolution of strain inside and outside the patched areas.

Posted in: Briefs, Physical Sciences
Read More >>

Software Virtual Networks Integrate Training and Operation of Wireless Net-Centric Warfare Systems

Military planners are aggressively developing network-centric warfare platforms that use wireless communications as a force multiplier. The aim of these programs is to provide warfighters with the best equipment and technology to achieve tactical dominance as soon as practical.

Posted in: Briefs, Information Technology
Read More >>

Interview with Ray Alderman, Executive Director of VITA

Founded in 1984 to promote VMEbus technology, VITA is a non-profit organization of more than 125 vendor companies who share a common interest in real-time, modular embedded computing systems. In August 2008, VITA's Executive Director, Ray Alderman, agreed to speak with Embedded Technology's editor, Bruce Bennett, about the state of VME technology in 2008, how far it has come in its 30-year history, and where it is likely to go in the future.

Posted in: Articles, Articles, Electronics & Computers, Embedded software, People and personalities
Read More >>

Modeling System Architecture and Resource Constraints Using Discrete-Event Simulation

Optimizing system resource utilization is a key design objective for system engineers in communications, electronics, and other industries. System resources such as processors, memory, or bandwidth on a communication bus are often shared by various components in the system. To understand the utilization of a shared resource, system engineers must do two things: they must identify constraints on the resource, such as number of processors and memory size, and they must analyze the effect of input traffic or load on the shared resource.

Posted in: Articles, Articles, Electronics & Computers, Computer simulation, Optimization, Architecture
Read More >>

RapidIO vs. Ethernet A Practical Technical Comparison

Ethernet is currently the incumbent backplane technology across a wide range of storage, wireless, wireline, military, industrial, and other embedded applications as developers move away from proprietary implementations in an effort to reduce development time and cost while increasing performance and functionality. However, as data rates increase, it has become apparent that many high-performance applications exceed the limits of this traditional protocol. Designing an efficient embedded backplane interconnect with excellent performance requires addressing a number of key design challenges, including header efficiency, protocol processing efficiency, effective bandwidth, and quality of service while strictly managing cost. To meet these challenges, many developers are turning to RapidIO® technology as an alternative to Ethernet.

Posted in: Articles, Articles, Electronics & Computers, Architecture, Data exchange, Embedded software, Data management, Technical reference
Read More >>

Designing Software Radio Systems With FPGAs

Software defined radio technology has been widely adopted for new military and aerospace platforms, government signal intelligence and homeland security systems, and now more extensively in commercial wireless voice and data networks as well. These modern communication systems need to squeeze more channels of traffic into an expensive slice of precious radio spectrum. Military and government requirements for secure communications mandate real-time encryption and decryption schemes that must be increasingly more resistant to interception. In multinational theater of war combat operations, communications systems must selectively ensure certain specific links and reliably deny others.

Posted in: Articles, Articles, Electronics & Computers, Communication protocols, Cryptography, Integrated circuits, Radio equipment, Defense industry
Read More >>

Front Panel Hardware Considerations For ATCA, AMC, and MicroTCA Telecom Equipment

Acceptance of telecom industry standards for rack-mounted server equipment — in the form of the PCI Industrial Computer Manufacturer’s Group (PICMG) standards — is gaining momentum throughout global market channels. The objectives of those standards are certainly attractive in terms of streamlining economy and efficiency for both carriers and telecom equipment manufacturers across a number of areas. Their aim is to reduce development time and costs, as well as to help reduce the total cost of ownership. They are also intended to offer high levels of modularity and configurability while delivering high levels of service availability (99.999% and greater) and supporting appropriate scalability of system performance and capacity.

Posted in: Application Briefs, Application Briefs, Electronics & Computers, Telecommunications systems, Market research, Standardization
Read More >>

System-On-Module Standard

MEN Micro Inc. (Ambler, PA) has announced the ESMexpress® System-On-Module Standard, a new computing standard in development to be the ANSIVITA 59 (RSE Rugged System- On-Module Express) standard. In conjunction with the new standard, they have also an - nounced the XM1 featuring the first-generation Intel® Atom® processor (Z530 at 1.6 GHz or Z510 at 1.1 GHz) based on 45-nm technology coupled with 1 GB of soldered DDR2 SDRAM for significantly lower power dissipation, reduction in design costs, and space-saving design flexibility. ESMexpress combines this model with advanced cooling technologies, and the latest serial buses and rugged components to ensure safe, reliable operation in harsh environments found in areas as diverse as the railway, avionics, industrial automation, medical engineering and mobile industries.

ESMexpress provides for extreme resistance against shock and vibration. Eight screws secure the module to the carrier board. In addition, a mechanically robust connector specified for MIL and railway applications supports differential signals with up to 8 GHz, features a stacking height of 5 mm with a minimum tolerance of +/-0.3 mm, is equipped with fixed contacts for power supply, and is specified for an operating temperature range of -55°C to +125°C. The Intel-based XM1 offers a screened temperature range of -40°C to +85°C. The electrical signals are distributed on two 120-pin connectors and are only defined for modern serial buses. For PCI Express there are four single lane ports (4 ×1) and one port that can be configured as 1 ×16, 1 ×8, 2 ×4 or 2 ×1. Other ports include three 1-Gigabit Ethernet (also as 10- Gigabit), eight USB, three SATA, SDVO, LVDS, HD Audio, several utility signals, and a single 12V power supply.

For Free Info Visit Here.

Posted in: Products, Products, Electronics & Computers
Read More >>

FPGA Mezzanine Card Module

VMETRO (Houston, TX) has released a FPGA Mezzanine Card (FMC/VITA 57) module. The ADC510, available in air-cooled and conduction- cooled rugged versions, integrates two 12-bit 500MHz A/D chips for use in DSP applications such as signal intelligence (SIGINT), electronic counter measures (ECM), and radar. This design, based on the emerging VITA 57.1 standard, makes it easier for developers to integrate FPGAs into their embedded system designs.

The ADC510 supports two Texas Instruments ADS5463 ADC devices, with each device supporting a sampling rate up to 500 MSPS and providing 12-bits of digital output. The ADC device interfaces are routed to the FMC connector to enable an FPGA on a baseboard to directly control and receive data. There is a choice of sample clock sources for the ADC510 including an onboard source that supports sampling rates of 300, 320, 400, and 500 MSPS as well as the ability to utilize an external sample clock. Input and output triggers are provided to enable multiple ADC510 modules to be synchronized to increase the number of input channels.

For Free Info Visit Here.

Posted in: Products, Products, Electronics & Computers
Read More >>

MCU/iChip Evaluation Board

Connect One™ (San Jose, CA) offers a reference design and a corresponding evaluation board that bring together Microchip's PIC24FJ64GA006 16-bit microcontroller (MCU) for application control, and the CO2128 iChip for secure, reliable TCP/IP connectivity to LAN and GPRS networks. Using the evaluation board, developers can quickly and easily develop an IP-en abled embedded system where the application resides on the PIC24 MCU and the networking and security are provided by the CO2128 iChip. The evaluation board provides dual-core Internet secure architecture where all con nectivity features are isolated from the application, providing a natural firewall. The PIC24F MCU provides application developers with RS-232/RS-485 serial connections, one serial peripheral interface, eight general-purpose I/O pins, an analog- to-digital converter, and 64 KB Flash and 8 KB RAM memory. With simple integration of an MII or RMII PHY, a 10/100 BaseT Ethernet link can be created. A UART connection allows users to operate at a baud rate of up to 1 Mbps between the PIC24 and the iChip. The CO2128 operates at an industrial temperature range of -40° to +85° C and is RoHScompliant.

For Free Info Visit Here.

Posted in: Products, Products, Electronics & Computers
Read More >>