Naval surface vessels and submarines operate in environments where they are highly susceptible to severe, rapid-onset dynamic forces. Unlike standard industrial machinery, naval equipment must withstand violent energy transfers transmitted directly through a ship's hull structure from nearby explosions. The is split into two critical segments:
BR 3021 breaks down equipment shock resistance into distinct severity levels, primarily categorized by where the equipment is installed on the vessel. The standard defines grades to establish peak acceleration ( -force) and duration (milliseconds) parameters: Shock Grade Installation Zone Vertical Shock Severity Lateral Shock Severity NSS Grade I Below the Water Line 120g for 8 ms 70g for 8 ms NSS Grade II Above the Water Line 50g for 11 ms 22g for 11 ms Functional Shock Categories br 3021 standard pdf
BR 3021 is frequently used in conjunction with other international and military specifications to create a comprehensive testing environment: Naval surface vessels and submarines operate in environments
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