shock/vibration

Multi-shaker Vibration Testing for Single-Axis and MDOF
iest, tri

Interest in multi-shaker vibration testing has increased significantly in the past few years. Multi-shaker testing has proven to be very useful for single-axis testing of test articles that are too large to be driven by a single shaker. Multi-shaker testing is also capable of more accurately simulating the actual multi-degree of freedom (MDOF) vibration environment experienced by your products. This course will provide an introduction to multi-shaker testing. It will cover multi-shaker test configurations, including multi-shaker/multi-axis and multi-shaker/single-axis configurations. The course will also cover the basics of multi-shaker vibration control, including measurement of MDOF vibration, selection of the proper number and location of control accelerometers, multi-shaker system identification, and multi-shaker control. Multi-shaker test environments covered will include random, sine, shock, and time waveform replication. The course will include demonstrations of both multi-shaker/single-axis and multi-shaker/multi-axis testing.

Course outline     Who should attend?     Course materials     Instructor

Course outline

  • Overview of Multi-exciter Testing
    • Benefits of Multi-exciter Testing
    • Multi-exciter Single-axis (MESA) vs. Multi-exciter Multi-axis (MEMA)
    • Typical MDOF Coordinate Systems
  • Test Equipment Considerations 
    • Degrees of Freedom vs. Degrees of Constraint
    • Common Actuator Arrangements 
    • Shaker Characteristics 
    • Bearing/Coupling Considerations 
  • System Identification for Linear Time Invariant Systems
    • MIMO Frequency Response Function
    • Matrix Inversion
    • Singular Value Decomposition
    • Over-determined Control
    • Kinematic Transformation
  • Transducer Considerations
    • Reference Data Considerations (Number and Locations of Control Transducers)
    • Reference Point Kinematics for 6 DOF Replication
  • Multi Exciter Test Considerations
    • Multi-shaker Single Axis
      • Single Degree of Freedom (SDOF) vibration on a MDOF Shaker System
      • Compensation for Overturning Moments
      • SDOF Force and Response Limiting Considerations
      • Minimization of Cross-axis Vibration.
    • Multi-shaker Multi-axis
      • Dual Axis
      • 3-Axis
      • 6 DOF
    • Kinematic Transformation
      • 6 DOF Control
      • Flexible Mode Control
    • Multi Exciter Control Considerations
      • Time Waveform Replication
      • Random
      • Shock (SRS, Transient, Classical Pulses)
      • Sine
      • Mixed Mode (Sine on Random, Random on Random)
  • Demonstrations
    • Multi-shaker Single-axis
    • Multi-shaker Multi-axis
    • Kinematic Transformation
Who should attend?

Information coming soon
    Course materials
    • Copy of PowerPoint presentation in course binder
    • Certificate of attendance for completion of CEUs
    Continuing Education Units: .6 CEUs

    Instructor

    Thomas Reilly