Concerned with the side-to-side (bending) vibrations of the shafting. Testing Procedures & Requirements
To access the MIL-STD-167-2 PDF, you can try searching for it on:
It is critical to note that MIL-STD-167-2 is a , but it is copyright-controlled by the DoD. The only authoritative, current source is the DoD Acquisition Streamlines and Information System (ASSIST) database (assist.dla.mil). mil std 167 2 pdf
"See this?" Elias pointed to a graph in the PDF showing frequency limits. "The standard dictates the test profile. It tells us exactly the amplitude of vibration we need to simulate at 4 Hertz, 15 Hertz, and up to 50 Hertz. We didn't build the motor to survive this curve."
"Initiating resonance search," the conductor announced. Concerned with the side-to-side (bending) vibrations of the
It wasn't the 22 Hertz from the sea trials; the test rig was stiffer. But it was close.
Elias watched the PDF printout pinned to the wall nearby. He traced the line of the test curve. The standard demanded that the equipment operate during the test. The motor wasn't just supposed to survive; it was supposed to spin. "See this
"We need Figure 2," he said.
MECHANICAL VIBRATIONS OF SHIPBOARD EQUIPMENT (RECIPROCATING MACHINERY AND PROPULSION SYSTEM AND SHAFTING) TYPES III, IV, AND V (CO... Intertek Inform 선박 추진용 유압작동식 다판 마찰클러치 조립축 크랙 현상 고장 ... that the clutch shaft-assembly cracks or fracture were caused by excessive torsional vibrations or torque inputs and were ulti- ma... e-jamet.org MILITARY STANDARD MECHANICAL VIBRATIONS OF ... V (CONTROLLED DISTRIBUTION) MIL-STD-167-2A, dated 21-May-1992, has been reviewed and determined to be valid for use in acquisition... ASSIST-QuickSearch Basic Search (.mil) MIL-STD-167: Shipboard Vibration Standards | PDF - Scribd May 17, 2005 —
According to official documentation from Intertek Inform, the standard categorizes vibrations into several "Types" to address different physical stresses:
"Look at the date," Elias pointed to the header. "1964. Revised '74. This standard is older than us. But the physics haven't changed."