High frequency vibration test fixture with hydraulic servo valve

Details High frequency vibration test fixture with hydraulic servo valve High frequency vibration test fixture with hydraulic servo valve

1996-01-31

1997-09-09

Williams, Hezron E.

Measuring and testing

Vibration

Vibrator

G01M 706

Patent

active

056659199

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 that can be integrated into a piston drive system to achieve high frequency and high force levels in a hydraulic vibration test fixture. Combined large acceleration forces up to about 6 g's at high frequencies up to about 2000 Hz can be produced in one embodiment of the invention.

REFERENCES:
patent: 4011749 (1977-03-01), Cappel
patent: 4145956 (1979-03-01), Rumrill, Jr. et al.
patent: 4293002 (1981-10-01), Moriyama et al.
patent: 4403511 (1983-09-01), Shibano et al.
patent: 4506758 (1985-03-01), Fair
patent: 4576203 (1986-03-01), Boyer et al.
patent: 4593719 (1986-06-01), Leonard
patent: 4741364 (1988-05-01), Stoss et al.
patent: 4748851 (1988-06-01), Yoneda
patent: 4875501 (1989-10-01), Ichihashi et al.
patent: 4996881 (1991-03-01), Tauscher et al.
"Proposal 15351," Dec. 4, 1990 pp. 13-14.
Hydrashakers, Team Corporation Catalog, pp. 1-16.

Affiliated with

Also associated with

Rating

High frequency vibration test fixture with hydraulic servo valve does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with High frequency vibration test fixture with hydraulic servo valve, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High frequency vibration test fixture with hydraulic servo valve will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-71656