Random Vibration Control

Random vibration simulates a broad range of real-world vibration environments. Since random testing excites all of a structure's resonant frequencies simultaneously, it is well suited to vibration qualification testing, and characterising a structure’s dynamics.

Uses 

• Simulation of vibration experienced by products used in automobiles, military vehicles, aircraft and space vehicles
• Replication of field measurements
• Production test, stress screening, prototype testing and qualification of products to military standards

Features

• Advanced control algorithms with fast processing provide accurate and safe closed-loop random control
• Up to 4 kHz control standard with the option for closed-loop control to 46 kHz
• Up to 1600 FFT lines standard with the option for up to 28 800 lines
• User-selectable overlap processing to speed equalisation times for low frequency tests
• PSD profile based on field data imported from ASCII and other file types

A random test definition consists of entering a PSD via a simple breakpoint table, or importing field data. The breakpoint table consists of PSD amplitudes and associated frequencies plus slopes. The table automatically calculates crossover frequencies or PDS amplitudes when slopes are used. As the breakpoint table is constructed, a plot shows the profile.

The overall rms value, maximum peak velocity, and maximum peak-peak displacement for the full level test are automatically displayed. If the test dynamic demands exceed the shaker system’s limits, the software automatically warns the operator.

Random vibration includes all of the tools needed for testing and analysis with ultra high resolutions up to 28 800 FFT lines and on-line FRF measurements.