MIL-STD-167-1A
g. Type II:
(1) Special vibration and balance requirements (see 5.2).
(2) Whether dynamic balance is required for machinery rated at lower than 150 rpm (see 5.2.2.1). (3) Balance quality grade (see 5.2.2.2).
(4) Whether vibration acceptance criteria of Figure 2 is specified for equipment with rigid rotors (see
5.2.2.2).
(5) When required, methods of mounting equipment for test (see 5.2.3.2.1).
6.3 Associated Data Item Descriptions (DIDs). This standard has been assigned an Acquisition Management Systems Control (AMSC) number authorizing it as the source document for the following DIDs. When it is necessary to obtain the data, the applicable DIDs must be listed on the Contract Data Requirements List (DD Form
1423).
DID Number DID Title
DI-ENVR-81647 Mechanical Vibrations of Shipboard Equipment
Measurement Test Plan and Report
DI-MISC-81624 Notification of Test/Trials
6.4 Tailoring guidance for contractual application.
Note: Equipment installed aboard naval ships is subjected to varying frequencies and amplitudes of environmental vibration for extended periods of time, during which they are required to perform their normal function. Principal causes of steady state shipboard vibration are propeller blade excitation and unbalanced forces of the propeller and shafting. Vibrations are also experienced by shipboard mounted equipment caused by mounting system resonances, changes in ship speed and heading, and changes in sea state. Vibration magnitudes measured on a ship during vibration trials should not be compared with the magnitudes shown in Table I because ship vibration trials are conducted in quiet water to achieve repeatable results during which changes in speed and heading are not made. See ANSI S2.25 for additional tailoring guidance.
a. The frequency range for Type I vibrations is determined based on blade rate frequencies associated with a specific ship design. If equipment is to be tested for use on multiple ship classes, the equipment may be tested over the frequency range encompassing various ship classes as required.
b. For Type I testing, if equipment is to be tested for use on multiple ship classes, the choice of equipment mounting may affect the number of equipment tests required to qualify the equipment for use on the intended ships.
6.5 Superseding data. This standard covers Types I and II vibration requirements formerly covered in MIL- STD-167-1 (SHIPS). Types III, IV, and V requirements are covered in MIL-STD-167-2 (SH).
6.6 Subject term (key word) listing. Balance quality grade
Balancing
Flexible rotor Response prominence Rigid rotor
6.7 Changes from previous issue. Marginal notations are not used in this revision to identify changes with respect to the previous issue due to the extent of the changes.
Source: https://assist.dla.mil -- 1D1ownloaded: 2014-09-28T13:20Z Check the source to verify that this is the current version before use.
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