High frequency vibration test fixture with hydraulic servo valve and piston actuator
US5343752A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 20, 1992 |
| Grant date | Sep 6, 1994 |
| Priority date | — |
| Expiry date | Apr 20, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2203/0256
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A vibration test fixture includes a reciprocating slip plate carrying an article subjected to vibration and shock testing. A pair of opposed, spaced apart low oil pressure hydrostatic linear bearings support the slip plate during reciprocating single-axis linear travel on the bearings. The slip plate is mounted to each bearing by a single-axis bearing guide system confining the slip plate to reciprocating longitudinal travel on generally planar, two-dimensional bearing surfaces that support the load of the slip plate. The slip plate is reciprocated by a voice coil-driven hydraulic servo valve and double-acting piston actuator integrated into the vibration table between the bearings that support the slip plate. The voice coil connects directly to a pilot valve in the servo valve assembly. The voice coil generates a vibrating linear motion input that reciprocates the pilot valve at controlled frequencies to induce alternating hydraulic fluid flow control outputs from the servo valve for reciprocating the actuator pistons that drive the slip plate. Other embodiments include a multiple-axis, multiple degree-of-freedom vibration test fixture, and a multiple stage hydraulic servo valve t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.