Test oversized products or replicate field assembly by synchronizing two to four shakers with the same test profile. The VR10500 vibration controller can perform multi-loop with or without phase control in the Sine, Random, Shock, and FDR test modes.
Download Demo All Software ModulesMulti-loop phase control synchronizes two or more shakers moving on the same axis while maintaining phase through level changes. It is achieved by using 2, 3, or 4 outputs of a VR10500. The drive and COLA outputs from one controller drive multiple shakers with the same test profile. The result is a synchronized set of shakers, ideal for complete system testing of a larger device.
Alternatively, dual-loop can be run without phase control (offset) in Sine to replicate a setup in the end-use environment, such as a push-pull configuration (180-degree phase difference).
A multi-loop test with phase control requires a VR10500 enabled with multiple loops. The primary VR10500 controller must drive all outputs, but the system can have stacked controllers for more than 16 inputs (up to 512).
The Sine, Random, Shock, and Field Data Replication (FDR) test modes can run 2, 3, or 4 output drive loops simultaneously but have different control capabilities.
Vibration Research’s high channel count control hardware for vibration and shock testing. Scalable to 512 channels and compatible with any electrodynamic or servo-hydraulic shaker. Features include up to 256kHz sample rate and 4 outputs for multiple shakers.
Run random tests with Gaussian amplitude distribution.
Playback a recorded time-history file as a control reference; the output phase is synchronized.
Run a single frequency sine tone at a defined amplitude and time.
Run an industry-standard pulse or a user-defined transient pulse; the output phase is synchronized.
Graph settings include a control loop section, and the user can select which control loop demand, control, tolerance, and abort traces to plot. Any loop can be the reference for the transmissibility plot.
Dual-loop phase control is a type of multi-loop phase control. Two shakers are in a push-push configuration if they face the same direction. When facing one another, they are in a push-pull configuration.
Oversized or heavy items may be too large for a single shaker. Learn how to set up a Random and Sine dual-shaker test to run in phase with this technote.
To perform multi-loop control in Random using the COLA output, the controller:
Dual shaker control in Random includes four control methods:
In Magnitude only or Magnitude and Phase control, the COLA trace is available on the following graphs:
