The required operating temperature range is from +5°C up to +55°C or +70°C for equipment indoors in control rooms, on the command bridge or in sleeping quarters. Stricter requirements apply for equipment used in for instance pump rooms and the strictest class marine of computer product requirements for operating temperature, from -25°C to +70°C, are applicable for equipment mounted on the ship deck and in masts.
Mechanical engineers at Hectronic use computer based flow simulation to identify hotspots and critical temperature areas at an early stage in the development project. The goal is to make sure that the design will meet the operating temperature requirements prior to manufacturing the first prototypes. The procedure involves the building of a 3D model based on the mechanical design and data about components that generate the more heat.
The result of the simulation (picture above) shows the air flow, temperature zones and hot spots and their respective temperatures. The data is basis for adjusting the design. Iterative simulations and design adjustments are made until the result is satisfying. Further testing in real life is performed on prototypes in the climate chamber at the development center in Uppsala, Sweden.
Shock and vibration
Maritime and offshore environments are typically suffering from shock and vibration more than the common industrial environment. Engines, pumps, bad weather and waves are challenging to any onboard equipment.
The forces affecting components are greater when components are large and weigh more. Therefore large components like back-up batteries or large reservoir capacitors may need to be fastened to the board to withstand forces generated by vibration or shock. Memories and storage modules are mounted in sockets and card holders with screws or snap locks for increased fixation.