Application stories

RUGGED MODULAR COMPUTER MEETS DEFENCE STANDARDS

RECAB presents a unique vehicle computer developed to meet defense standards. This model is based on CompactPCI, but we can adapt it to meet your specific requirements. We believe there is a strong need for a rugged vehicle computer platform for many commercial applications, too, especially in demanding in-flight and at-sea environments. Modular platform for extreme conditions

One of our defense clients had extremely tough requirements on all specifications. The unit had to stand up to shocks and vibrations and resist EMC interference, both from radiation and from power lines. It had to be compatible with special circular military connectors that the clients installed themselves. It took a 28 volt power supply, but had to be able to deal with a voltage range from 12–36 V. Cooling the unit was also a major challenge – and these are just a few items on a lengthy list of requirements. We delivered a complete solution including both the CPU and the box, and we have kept it running smoothly ever since.

"The biggest challenge in this development project was making the two solid-state disks removable."

Removable disks

The computer is permanently mounted in the vehicle. However, when leaving confidential data unattended is out of the question, or if you want to be able to analyze the data elsewhere, removable disks are the solution. They are also convenient to use if you have large amounts of data that is not easily transmitted. More and more customers are asking for this feature.

The biggest challenge in this development project was making the two solid-state disks removable.They were going to come out twice a day over the course of five years, meaning the connectors had to stand up to at least 5,000 cycles. We developed a special aluminum cassette in house to hold the card and a unique custom connector that is specified to handle 100,000 cycles. Overkill? Maybe – but it’s not going to fail.

Rugged chassis

To deal with shocks and vibration, the box is built in a self-supporting aluminum frame that is screwed directly into the vehicle. The entire box is also made of aluminum to keep weight down. The cover plate is grooved to double-seal it against the box.

The application has fans, so it doesn’t have to be completely moisture-proof. It can be made water resistant enough to stand up to spray cleaning by adding IP65 rated rubber gaskets, but then it can’t be cooled with fans. As for radiation from the power supply, there are heavy-duty filters right inside the power connection to shield the electronics.

Power monitoring concept

To meet vehicle power requirements, we had to custom develop the entire power supply unit. Another valuable feature is the management module that checks the voltage and all other levels, checks temperatures in the box, controls the fans, etc. It can manage operations without supervision if desired, shutting down the system to protect the electronics if it gets too hot.

Tested in the toughest conditions

The client carried out the final tests. They have run every imaginable test on this unit: shock and vibration tests, EMC interference, moisture testing, low pressure use, and much more. It has to function without problems at very high altitude, where lower air pressure can cause problems for the cooling.

  

If you need a truly rugged modular platform for your vehicle computers, look no further.

  

 

FOR MORE INFO

Johan Nordin, Director of Development, RECAB
Tel: +46 8 683 03 12
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.


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