Sine Oscillator

Single Axis Shaker Vibration Testing

Sine Oscillator is a diagnosis tool with manual control to the sine output while the system displays various time signals and frequency spectra. Users can enable random excitation as a checkup function. Tracking filters are applied to each input channel to extract the signals at a sweeping frequency. When the close-loop option is enabled, the Sine Oscillator is essentially a limited sine controller with more manual control functions.

Sine Oscillator

Sine Oscillator

Control Parameters

The Sine Oscillator mode of the Swept Sine vibration test allows the output sine wave to be manually controlled by the user. The controllable parameters include frequency, amplitude, sweep rate, frequency limits and direction. When being manually controlled, the sine output is not under closed-loop control as it is during a regular swept-sine test. Closed-loop control can also be turned on to function as a simple sine controller.

  • Frequency Range: up to 46 kHz
  • Sweeping Rate: Log (Oct/Min): 0.001 to 120; Log (Dec/ Min): 0.001 to 40; Linear (Hz/Sec): 0.001 to 120
  • Sweep Rate Control: Oct/Min, Hz/Sec, Dec/Min, Sweeps/Min, Sweep Duration/Sweeps
  • Spectrum Display Resolution: 256 to 4096
  • Tracking Filters: proportional: 7% – 100%; Fixed (Hz): 1 – 500 Hz
  • Frequency Resolution: as fine as 0.000001 Hz
  • Control Mode: either open-loop or with close-loop control

Notching and Limiting

Limiting is applied to control or monitor channels. Three types of limiting are available in Sine Control: frequency domain, time domain, and advanced limit. Two types of limiting are available in Multi-sine control: frequency domain and time domain.

Frequency domain limiting is spectrum limiting. Limit types are notching limit, abort limit, and alarm limit. Time domain limiting compares raw data or the RMS value of input channels to the high limit. The occurrence of exceeding the high limit is one of the system events to which desirable actions can be added. Advanced limit includes summed channel notching and vector notching.

A summed virtual channel is defined as the weighted average of raw time stream signals from multiple input channels. The Notch profile of a summed channel is defined in the frequency domain.

A vector RRS signal is defined as the vector sum of raw time stream signals from three input channels. The notch profile of a vector RRS signal is defined in the frequency domain as well.

Supports up to 128 notching/limiting channels out of 512 input channels.

Continuous Data Recording

During vibration testing, all measurement input and drive signals can continuously record to a Spider-NAS or the internal storage residing in each front-end. Users can view and analyze data files with Crystal Instruments Post Analyzer. The variable sampling rate can be enabled to simultaneously record slow-change signals together with high speed vibration data.

Vibration Utilities App

Crystal Instruments in partnership with our sister shaker company Sentek Dynamics provides users with the Vibration Utilities mobile app on iOS and Android. This app provides calculation features for sizing your vibration profile (Random, Sine or Shock) and searches through our catalogue of shakers and controllers for the best fit.



Unique Features in Sine Oscillator

Vibration Visualization: The EDM Vibration Visualization feature is available in EDM VCS software all test types, including MIMO VCS. This option provides fast and efficient structural model generation and full 3D visualization of the online vibration pattern on the structure under test.

Multiple instances of EDM VCS can run simultaneously on the same computer. Each instance connects a Spider system to run the vibration controller software. All instances must run different tests. This feature provides a central place to control multiple Spider systems and perform vibration tests separately.

Black Box Mode: Operating Without a PC
A supported front-end can operate in Black Box mode which allows it to perform a test without a connected PC. In this mode, a PC is used only to configure the system before the test and then to download the data after the test is complete.

Multi-shaker control (MSC) is a unique feature offered enables users to view and monitor multiple shaker tests from one PC station. Up to 12 controllers can be accessed simultaneously.

Spider Vibration Testing Hardware

A Spider system can consist of one or more Spider hardware front-ends. The user constructs the system by combining Spider front-ends detected on the same LAN. The software validates and displays hardware attributes of each Spider front-end. The following hardware is supported by EDM VCS software for vibration control, monitoring, and data acquisition.

Related Vibration Testing Software Options

Monitoring Through EDM Cloud

All vibration tests in EDM-VCS support status checks through EDM Cloud. With EDM Cloud support, users can set up any VCS test to upload live data or run logs for completed tests to a cloud storage space provided by Crystal Instruments, where data is securely stored in the user’s account.

The EDM Cloud website is located at https://cloud.go-ci.com. Users can access EDM Cloud from anywhere in the world to check the status of past and current tests. A secure login flow ensures the status can only be checked by authorized personnel with proper credentials. Multiple logins for accessing the same Cloud account is available.

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