Tri State Hydraulics

Seismic Testing

We utilize two Seismic shake tables capable of qualifying a wide variety of equipment.

Our primary Seismic shake table is comprised of a 10 x 10 hexagon plate operating on an independent tri-axial system. This table is capable of performing seismic testing of large packages up to 20,000lbs (max total product weight including all fixtures) with ZPA of 1G. Higher ZPA's can be achieved with lower weight. 

Clark's data acquisition systems feature state-of-the-art electronic monitoring systems and recorders through National Instruments (NTI ? up to 26 monitoring per unit under test) to insure a detailed comprehensive seismic test report. This meets IEEE 323, IEEE 344, IEEE 693, IBC-2009, and Bellcore specification. 

The seismic shake tables are of different sizes to accommodate requirements varying from a high input acceleration levels of small equipment (control board components) to low input acceleration levels of large equipment (such as safety injection pump). 

The Clark Testing tri-axial shake table is designed to generate independent tri-axial motions (of different magnitude). The bi-axial table can generate dependent of bi-axial motions (or simulated tri-axial motions of equal magnitude in three orthogonal directions). The input in either case could be sinusoidal, multi-frequency, or sine beat to achieve required input motion or response spectrum. The tri-axial shake table could also develop uni-axial or bi-axial motions. Clark Testing also features separate single axis shake systems for both horizontal and vertical applications. 

Seismic Test Equipment 

10 ft. Diameter Independent Tri-Axial Shake Table

Bare Table Weight About 5,400 lbs.
Actuator 3-38,000 lbs. Force ±5 in Stroke
Servovalve 600 gal./min. 50 ips Velocity
ZPA Approximately 2g up to 10,000lb test unit & 5g for lower weight
Peak Spectral Acceleration 15g - 18g

10 ft. Diameter Independent Bi-Axial Shake Table

Bare Table Weight 1,000 lbs.
Table Angle 35°
Actuator 22,000 lbs. Force ±12 in Stroke
Servovalve 150 gal./min. 100 ips Velocity
ZPA 10g - 12g depending upon weight of test unit
Peak Spectral Acceleration 14g @ 5% damping

RIM Table

Bare Table Weight 400 lbs.
55,000 lbs. Force, Stroke normally utilized +5" (maximum stroke available +4.95")
Servovalve 200 gals/min.
Peak Velocity 70"/second
Maximum Accelerations 8 g up t

o 4,000 lbs. total weight on table

  • 20 Ton Overhead Crane with 30ft Clearance Above Table

  • Proficient with California Building Code ? IBC

  • Data Acquisition/Monitoring Systems

Other Capabilities 

The Clark Dynamic Calibration & Standards Laboratory repairs and calibrates measurement and test equipment (MT&E) and maintains direct traceability to NIST Standards.

  • Load Testing - #20, 000

  • Gas Flow - 50 cu. ft. hr.

  • Humidity

  • Accelerometers

  • Air Flow - 2,000 fpm

  • Water Flow - 3 gpm

  • Temp. - RTD

  • Load Cells

  • Strain Gauges

FLUID TESTING CLARK TESTING Laboratory Testing Seismic Testing