Subsidiary Shock Test System

Team Corporation’s Subsidiary Shock Test System (SSTS) is able to reproduce the entire acceleration time-history resulting from detonation of the test charge as described in MIL-S-901D. This includes the initial shock pulse from the detonation and the “bubble pulse” that follows in approximately 650 msec.

The SSTS has also shown the capability to reproduce the decaying sinusoid that is sometimes measured in the frequency band centered around 60 Hz.

MIL-S-901D Shock Test

The MIL-S-901D specification involves mandatory shock testing procedures for shipboard machinery, systems, structures, and equipment, excluding pressure hull penetrations on submarines. The purpose of these specifications is to confirm the ability of shipboard equipment to endure shock vibrations that might incur during wartime operations due to the results of nuclear or conventional weapons.

MIL-S-901D shock tests are separated into two grades:

  • Grade A: Items that are essential to the safety and capability of the ship to properly function.
  • Grade B: Items that are nonessential for the vessel to function.

Based on the mounting requirements of these items, the spec breaks down the equipment into three classes:

  • Class I: Equipment needed to meet shock requirements without the use of isolation or shock mountings.
  • Class II: Equipment that meets shock requirements with the use of resilient mountings.
  • Class III: Mounted equipment on a ship that either does or does not use resilient mountings installed between itself and the ship’s structure.

This specification involves three types of tests, which are outlined below.

Type A

Type A is the primary and preferred test, and it involves a principal unit. Principal units are directly supported by the ship structure or by a foundation attached to it. Items mounted in ducting and piping systems and other systems supported by the ship’s structure are also considered principal units.

The shock response of a principal unit is primarily a function of the rigidity and mass of the item and the structure itself, the mounting location, and the configuration of the item. These items typically include valves, switchboards, steam generators, radio transmitters, diesel-generator sets, and missile launchers.

Type B

A Type B test is a test of a subsidiary component. These components are the primary parts of a principal unit. The shock results of the subsidiary component are mainly affected by the associated principal unit and all associated subsidiary components.

Examples are the power supply section of a radio transmitter, the diesel engine of a diesel-generator set, or the electric motor of an air conditioning unit.

Type C

A Type C test involves subassembly testing. Subassemblies are items that are part of a subsidiary component or a principal unit. The shock response of the subassembly is noticeably affected by the subsidiary component or associated principal unit, but the shock results of the subsidiary component or principal unit are not notably influenced by the subassembly.

Examples are resistors, relays, meters, thermometers, and gauges. Subassembly and assembly parts used may differ from those used in various equipment specifications or other acquisition documents.

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For any questions relating to a new or existing Subsidiary Shock Test System, contact Team Corporation today!

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Some of the highlighted features of the SSTS include the following:

  • Replication of Measured Environment Required by MIL-S-901D
  • High Force Capability According to Your Requirements
  • Velocity of 120 ips (3.07 m/sec)
  • Team Customized HDRS Software
  • Reliable Voice Coil Driven Team Servohydraulic Actuator
  • Assembled as Single Integrated Vertical / Horizontal System
  • Available as Separated Vertical / Horizontal System

Applications of the SSTS include but are not limited to:

  • MIL-S-901D Testing of COTS Equipment
  • NAVSEA UERD Electronics Development and Qualification
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