Radar systems resistant to large differences in temperature

The radar system on board a naval vessel is subject to heavy treatment. Also during storms, large differences in temperature and various military action it is of vital importance that the radar functions faultlessly. The system must also be resistant to influences brought about by extreme circumstances. Violent shocks and vibrations are more the rule rather than an exception. And because of the various locations – from the Arctic Ocean to the Persian Golf – temperature differences play a big part.

The Challenge

The radar systems must be effectively cooled by powerful ventilators which are able to stand up to rough treatment. The standard ventilators which the Navy originally used do not appear to conform to the requirements. The extreme circumstances on board a naval vessel are responsible for regular breakdown of the air cooling system, which has led to unacceptable temperature differences in the radar systems. The weak points in the standard ventilators are the bearings, the housing and the internal wiring. Mulder-Hardenberg had the job of realising a ‘custom made’ ventilator that does conform to the requirements.

The Solution

In collaboration with the ventilator manufacturer ETRI, Mulder-Hardenberg took on the challenge. The new ventilator must comply with the strict guidelines and specifications of the military. On the basis of the requirements the collaboration between ETRI and M-H lead to a prototype that was subjected to the most extreme endurance tests. The operational ventilator was exposed for long periods to temperatures of minus fifty to plus one hundred Centigrade. After the test period, which the prototype withstood splendidly, production was started and 24 examples were installed in one of the largest radar systems on board a Royal Navy frigate.

The Implementation

The ventilator appeared to function excellently in all aspects. The ‘custom-made’ ETRI military-specified equipment is also used to cool the steering systems of gun turrets for those reasons (among others). The air conditioning of computer systems on board naval frigates is also of vital importance. The new ventilator has proven to also be capable of performing this important task. Capacity and reliability are of overriding importance and are outstanding in this product developed by M-H and ETRI.

The result

The MTBF (Mean Time Between Failures) of all systems where the ETRI ventilators have been used has been considerably improved. The Ministry of Defence and the supplier have always demanded that the ventilators should have a guaranteed, operational period of ten years. Mulder-Hardenberg has given a guarantee on their ETRI ventilators of as much as fifteen years. The consequence of this assurance from Mulder-Hardenberg is a reliable, solid relationship with both parties.

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