When a military computer encounters certain levels of vibration, functional and structural failure can occur if it hasn't been tested to meet military vibration standards, such as those outlined in the popular MIL-STD-810 testing standard.
MIL-STD-167-1, currently MIL-STD-167-1A, is a military standard published by the U.S. Department of Defense and used by test engineers to assess the impact of mechanical vibrations on Navy shipboard equipment, including rugged servers, workstations and their components.
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The test procedures in MIL-STD-167-1 apply to any Navy shipboard equipment subjected to mechanical vibrations from the environment, as well as internal excitation caused by unbalanced rotating components.
Essentially, any equipment or rugged computer system intended to be installed on Navy ships powered by conventionally shafted propeller propulsion, i.e., a ship with rotating blades that move the vessel across a body of water, should undergo MIL-STD-167-1 testing prior to installation.
During the MIL-STD-167-1 exploratory vibration test, the equipment is secured to a shock and vibe table and vibrated at frequencies ranging from 4 Hz to 33 Hz, at a table vibratory single amplitude of 0.010 0.002 inch.
During the MIL-STD-167-1 variable frequency test, the equipment being tested is vibrated at frequencies ranging from 4 Hz to 33 Hz in discrete frequency intervals of 1 Hz at the amplitudes depicted in Table 1 of the standard.
At each interval of the variable frequency test, vibration is maintained for five minutes. As with the exploratory vibration test, any observance of damage or impairment is recorded, and the system or piece of equipment, if adversely affected, moves on to endurance testing.
During MIL-STD-167-1 endurance testing, the frequencies at which damage or impairment were observed in the previous two tests are used to further test the equipment or system for vibrational stress. The equipment or system is vibrated for at least two hours at the frequency that affected it the harshest during the previous tests.
During MIL-STD-167-1 endurance tests for mounted equipment, the system or piece of equipment is designed for a static load of 2.5g in vertical and transverse directions to compensate for rough weather factors. The system or equipment is vibrated for at least two hours at 33 Hz, unless response prominences were observed by the test engineer or the equipment meets specific exceptions.
The Type 2 category also specifies rotor characteristics, the revolutions per minute (RPM) at which the rotating machinery in question operates and the types of balancing and procedures appropriate and necessary for machinery operating at the specified RPM.
The Type 2 category specifies one vibration test procedure. During testing, the test equipment or system is mounted at a natural frequency corresponding to less than one-quarter of the frequency associated with the minimal operational speed of the unit or mounted on the shipboard mounting to which it will be fixed during real-world operation.
MIL-STD 167 specifies procedures and establishes requirements for environmental and internally excited vibration testing of Naval shipboard equipment installed on ships with conventionally shafted propulsion. The test methods specified are applicable to shipboard equipment subjected to mechanical vibrations from the environment and from internal excitation caused by unbalanced rotating components of Naval shipboard equipment. MIL-STD 167-2 covers mechanical vibrations associated with reciprocating machinery and lateral and longitudinal vibrations of propulsion system and shafting.
a. For Type I vibration testing, this standard shall be used for equipment subjected to the vibration environment found on Navy ships with conventionally shafted propeller propulsion. Type I vibration testing shall not be applicable to high-speed or surface-effect ships that are subject to vibrations from high-speed wave slap, which produce vibration amplitudes and frequencies in excess of the levels on conventional Navy ships.
b. This standard applies to Type I vibration testing for equipment used in Navy ships with conventionally shafted propeller propulsion, and is not necessarily applicable to water jet, podded, or other propulsion types, including those that have been designed to minimize blade-rate forces.
Keystone Compliance assists manufacturers with MIL-STD-167 compliance. This page lists every method and section of the standard for informational purposes. There may be methods and sections that fall outside of our scope. Please contact us for more information on how Keystone Compliance can assist you with identifying and fulfilling your MIL-STD-167 needs.
Claudia's Notes:Part 2 addresses those mechanical vibrations associated with reciprocating machinery and lateral and longitudinal vibrations of propulsion system and shafting. It is classified and not available from Document Center Inc. You'll need to see your DoD Contracting Officer for a copy if you have clearance for the document.
It is approved by the Naval Sea Systems Command, Department of the Navy, and is available for use by all departments and agencies of the Department of Defense. Together, MIL-STD-167-1A and MIL-S-901D, equipment shock testing, provide complementary requirements for the survivability of shipboard equipment.
The testing procedures in MIL-STD-167-1 apply to equipment on Navy ships that is subjected to mechanical vibrations from the environment and internal vibration caused by unbalanced rotating components during operation.
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