Resonance Search and Dwell Vibration Control

Resonance Dwell is a convenient, repeatable way to stress a test article for low- or high- cycle fatigue testing

Cyclic stress testing using Resonance Search and Dwell is the most effective way to assess the fatigue life of a test article. Resonance Dwell uses the test article’s modeshapes to impart stress at the same locations and in the same directions that the test article would experience during its lifetime. 

SignalCalc 900 Resonance Dwell

Control High-Q Resonances

Optimized Control Loop

Effective control of test articles with extremely high Q resonances such as turbine blades or beams

Control Sensors

Control off of any sensor – Accelerometers, lasers, displacement, or more

Long Duration Tests

Tests can run for hours, days, or weeks at a time, for low- or high- cycle fatigue

Manual Rampup

Ramp up a dwell manually to prevent overshoot

High Speed Notching

High speed notching/limiting can be applied to any channel, during the sweep or dwell

Displacement that Accounts for Nonlinearities

Prevent over test using a math channel (DP900-81) to compute net displacement in the time domain, and use the resulting displacement as a limit channel

Resonance Search and Dwell Features

Sine Sweep for Resonance Identification

Run a new sine sweep, or use a previously run Sine sweep for resonance identification

Scheduled Dwells

Build a Dwell Table based on the sweep data, with dwell levels and durations specified for each dwell

Automated Resonance Search

Sweep data can be exported automatically at the end of a test

Long Duration Tests

Dwells can run for days, weeks, or longer periods

Critical Data Saved Throughout Test

Acceleration, Velocity, Displacement, Transmissibility, Phase, Frequency, and more versus time are saved for the duration of the dwell

Control Channel Selection

Swap control channels between the sweep and dwell with no ambiguity about which is used

Chamber or External System Interface

Command or take commands from a thermal chamber, software application, or other control system through an application interface or relay card (DP900-45)

Time Data Recording

Time data can be saved for the duration of the test (DP900-23)

Integrated Strain Signal Conditioning

  • Minimize cost by eliminating external strain signal conditioners
  • All voltage/ICP and strain channels are configured in one software interface and forms a single synchronized data set
  • Supports quarter/half/full bridge strain gauges, bridge sensors, or traditional ICP/IEPE voltage sensors
  • Strain channels can be used for measurement or control
  • Record time history data on all voltage/strain channels in parallel with the test
Shown in the 906 chassis – the Multi Function precision conditioning and measurement card is an all-in-one solution for bridge, voltage and IEPE/ICP (including TEDS) signal conditioning. Featuring 4 versatile input channels with secure micro-D9 connectors in the front-end, the Multi Function card can tackle a wide range of dynamic signal measurement applications. Providing an integrated and synchronized solution for SignalCalc 900 analyzer and controller applications.

Convenient Setup Interface

Resonance Search and Dwell Setup

1 Previous Sweep Data
Run a Sine Sweep for Resonance Identification, or load data from a Resonance Dwell or Sine test

2 Clear Channel Definitions
Clearly define the phase reference, phase response, Sweep Control, and Dwell Control channels

3 Auto Resonance Search
Search for resonances automatically by defining search parameters.  Resonance Search and Dwell can be fully automated

4 Dwell Table
Build a list of dwells to dwell at different resonances sequentially, or at different levels sequentially

5 Customizable Dwells
Define Dwell Durations in time or cycles; and define the dwell level in displacement, velocity, acceleration, or with a breakpoint table.

6 Manual Ramp
Manually ramp up the test level to prevent any overshoot