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MIL-STD-167 Vibration Testing

The requirements for MIL-STD-167 vibration testing specify environmental and internally excited vibration simulation to test Naval shipboard equipment for components that are installed on ships with conventional propulsion systems. The test method is applied to equipment and systems that would be subject to mechanical vibration from outside environmental operating conditions as well as internally generated vibration caused by rotating components and reciprocating machinery.

For over 30 years, Clark Testing has conducted MIL-STD-167 test programs in support of manufacturers and system integrators. These MIL-167 services include program and test plan development, fixture fabrication, installation of instrumentation and implementing test programs for validation of equipment in accordance with the MIL standard.

There are two types of vibration test standards covered in the MIL-167 Standard:

Type I - Environmental vibration: Type I vibration requirements are specified when equipment is subjected to an environmental vibration encountered aboard naval ships. This standard provides an amplitude sufficiently large within the selected frequency range to obtain a reasonably high degree of confidence that equipment will not malfunction during service operation on Navy ships with conventionally shafted propeller propulsion. Type I vibration testing is not applicable with high-speed or surface-effect ships that are subject to vibrations from highspeed wave slap, which produce vibration amplitudes and frequencies in excess of the levels on conventional Navy ships.

Type II – Internally excited vibration: Type II balance and vibration requirements shall apply to the procurement of rotating machinery, unless otherwise specified. This does not apply to suitability from a noise standpoint, nor does it apply to reciprocating machinery. Special vibration and balance requirements may be specified. All rotating machinery should be balanced to minimize vibration, bearing wear, and noise. Types of balancing shall be as specified to meet the limits of allowable residual unbalance. Machinery with rotors which are unable to meet the balance requirements of rigid rotors shall be balanced in accordance with the acceptable requirements.

Test procedures specify exposing equipment to:

  • Vibration magnitudes in prescribed frequency and amplitude ranges to reveal any critical response prominences or potential deficiencies.
  • A 2-hour minimum endurance test at the response prominence frequency or frequencies most seriously affecting its functional and/or structural integrity.

The test engineering team at Clark Testing will help identify the appropriate frequencies, amplitudes, test fixtures and instrumentation, to qualify your equipment to MIL-167 standards.

Test Set Up

In house custom design and fabrication capabilities (machining and welding) to ensure test fixtures accurately simulation environmental conditions.  FEA capabilities to support fixture design along with welding, fabrication & machining services.  Multiple vibration adapter plates and prefabricated test fixtures help to streamline the testing process.

Instrumentation capabilities including accelerometers and strain gages with multi-channel control and data acquisition equipment ensuring accurate test data is being recorded.  All instrumentation and equipment is provided with measurement uncertainty and compliant   with Clark’s ISO 17025-2017 Quality Program.

Lab technicians and engineers record daily test activities to register all activities, events, and responses during the test.  The daily test logs along with test data, pictures and test procedures are included in comprehensive test report that is the industry standard.

 We work closely with you to validate engineering, ensure quality, analyze test spectrums, and execute accurate testing programs for successful qualification and marketing of your product.

We work closely with you to validate engineering, ensure quality, analyze products and qualify equipment while supporting the time constraints and product cycles that are vital to your success.

Paul Heffernan, CEO of Clark Testing