MIL-STD-167-1 Mechanical Vibrations Of Shipboard Equipment Type I - Environmental And Type Ii - Internally ExcitedThis standard specifies procedures and establishes requirements for environmental and internally excited vibration testing of Naval shipboard equipment installed on ships with conventionally shafted propulsion see 6.1.e and 6.1.f.

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MIL-STD-167-1A

TABLE II. Duration of endurance test in a given orthogonal direction at each test frequency.

Number of endurance test frequencies	Test time duration at each endurance test frequency	Total time
1	2 hours	2 hours
2	1 hour	2 hours
3	40 minutes	2 hours
4	40 minutes	2 hours, 40 minutes
n>2	40 minutes	40 x n minutes

5.1.2.4.7 Endurance test for mast mounted equipment. Equipment intended for installation on masts, such as radar antennae and associated equipment, shall be designed for a static load of 2.5g (1.5g over gravity) in vertical and transverse (athwartship and longitudinal) directions to compensate for the influence of rough weather. In

addition, the equipment shall be vibrated for a total period of at least 2 hours, at the response prominences chosen by the test engineer. When specified (see 6.2.f(9)), selection of these frequencies is subject to approval. If no response

prominences were observed, this test shall be performed at 33 Hz, unless excepted by 5.1.2.4.4, in which case the

maximum frequency specified in 5.1.2.4.4 shall be used. The amplitudes of vibration shall be in accordance with

Table III.

TABLE III. Vibratory displacement of environmental vibration for mast mounted equipment.

Frequency range (Hz)

Table single amplitude (inch)

4 to 10

11 to 15

16 to 25

26 to 33

0.100 ± 0.010

0.030 ± 0.006

0.020 ± 0.004

0.010 ± 0.002

5.1.2.5 Test documentation.

5.1.2.5.1 Test plan. When specified (see 6.2.b), an equipment test plan for Type I tests shall be prepared in accordance with DI-ENVR-81647 (see 6.3). The test plan shall specify, describe, or define all requirements and shall be approved by the acceptance authority prior to the test as specified (see 6.2.f(10)).

5.1.2.5.2 Test report. A test report (see 6.2.b) for Type I tests shall be prepared in accordance with DI-ENVR-

81647 (see 6.3) and shall be approved by the acceptance authority as specified (see 6.2.f(10)).

5.1.3 Exemption. If equipment size, weight, or center-of-gravity precludes testing on existing vibration facilities, the equipment may be qualified by analysis or individually testing integral parts of the equipment, as approved by the acceptance authority.

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