INERTIAL MASS GUIDED SINGLE AXIS VIBRATION TEST MACHINE

摘要

A single axis vibration test system resists cross-axis motions. The test system includes a vibration force generator which optionally can be used with a head expander to increase the potential size of objects being tested. Separate pairs of hydrostatic self aligning sliding bearings connect two large reaction masses to the head expander. Preload forces are applied against the hydrostatic bearings by separate preload pistons supported on a preload ring that surrounds the shaker. The preload forces are transmitted by the preload ring to the separate pairs of the hydrostatic sliding bearings to clamp the head expander directly to the reaction masses, which resists lateral motions and rotational motions during testing in the vertical axis. The reaction masses are supported on air springs or other resilient means of support on a rigid sub-structure rigidly affixed to ground. The air springs provide an elastic support that avoids a rigid connection between the preload ring and ground which in turn avoids unwanted mechanical resonances within the operational frequency range of the system during use.