VR Shaker Controllers

What is the difference between random and sine vibration testing?

Sine testing applies a single frequency vibration at any given moment, sweeping through a frequency range to identify resonances and test at specific frequencies. Random testing applies a spectrum of frequencies simultaneously, providing a more realistic simulation of many real-world environments. Each method serves different testing objectives, and modern controllers can perform both types of tests with high precision.

How do I select the right number of control channels for my application?

The required number of channels depends on your test complexity, specimen size, and control strategy. Single-channel control is sufficient for many applications, while multi-channel control becomes necessary for large test items, multi-axis testing, or when implementing control strategies like averaging or notching. LabroTek can help assess your specific requirements and recommend an appropriate configuration.

What types of vibration tests can modern controllers perform?

Modern vibration controllers typically support a wide range of test types including sine, random, shock, mixed-mode, sine-on-random, random-on-random, classical shock, SRS shock, road simulation, and time waveform replication. Advanced controllers can also perform specialized tests such as fatigue damage spectrum analysis, kurtosis control, and multi-axis testing.

How do vibration controllers protect the test specimen and shaker system?

Controllers employ multiple layers of protection including drive limits, abort tolerances, alarm limits, and pre-test checks. These features monitor acceleration levels, displacement, voltage outputs, and test parameters in real-time, automatically adjusting or shutting down the test if safety thresholds are exceeded, preventing damage to both the test item and expensive shaker equipment.

Can vibration controllers replicate real-world vibration environments?

Yes, modern controllers excel at replicating real-world conditions through time waveform replication (TWR) and field data replication (FDR) capabilities. These functions allow engineers to record actual field vibrations and reproduce them in the laboratory with high fidelity, creating more relevant tests than standardized profiles alone.

What is the importance of loop time in vibration control?

Loop time is the interval at which the controller updates its control signal to the shaker. Shorter loop times enable more precise control, especially at higher frequencies and during transient events like shocks. Advanced controllers achieve loop times of just a few milliseconds, providing the responsiveness needed for accurate reproduction of complex vibration profiles.

How do I integrate vibration controllers with environmental chambers?

Integration typically involves positioning the shaker to interface with the chamber, using special feedthrough ports for cables, and coordinating control systems. Advanced vibration controllers can communicate with environmental chambers via digital interfaces to synchronize vibration profiles with temperature and humidity changes. LabroTek provides complete integrated solutions and expert guidance for combined environmental and vibration testing.

What data analysis capabilities do modern vibration controllers offer?

Contemporary controllers include comprehensive analysis tools such as FFT analysis, transfer function calculation, coherence measurement, histograms, probability density functions, fatigue damage spectrum analysis, SRS calculations, and statistical tools. Many systems also offer customizable reporting features and data export capabilities for further analysis in specialized software.

Can vibration controllers be operated remotely?

Yes, most modern vibration controllers support remote operation through network connections, allowing engineers to monitor and control tests from different locations. This capability is particularly valuable for long-duration tests, hazardous testing environments, or when expertise is needed from remote team members. Advanced systems include security features to ensure only authorized personnel can control testing operations.

What maintenance is required for vibration control systems?

Maintenance typically includes regular calibration of input channels and output signals, inspection of cables and connections, software updates, and occasional hardware diagnostics. LabroTek provides comprehensive maintenance services and preventative maintenance plans to ensure optimal controller performance and testing accuracy throughout the system’s lifespan.