Vibration Testing

graph from vibration test lab

Can your products, parts, or assemblies sustain the shaking they receive in transit or in daily use? Vibration testing allows you to evaluate their performance under virtually identical conditions.

Element vibration testing laboratories

Element has virtually total vibration testing capability. Our multi-shaker facilities are comprised of both electrodynamic and hydrodynamic systems. Element’s 40,000 force-pound electrodynamic shaker system includes an Unholtz Dickie T-4000 shaker combined with a 60-inch by 60-inch bearing slip table mounted on an integrated unibase. 

Among our resources is a 48-inch Magnesium Head Expander to accommodate larger test items in the vertical axis. This equipment, combined with our 20-foot overhead clearance, allows the testing of large/tall items with high overturning movements. Element operates an m+p international 64-channel, digital dynamics control system for our electrodynamic and hydrodynamic shakers. 

Meeting military (MIL-SPEC) requirements

All Element Dynamics Testing facilities help companies meet the latest MIL-SPEC and MIL-STD requirements, including: 

  • Narrow Band Random on Random
  • Swept Sine Superimposed on Random
  • Gunfire Simulation
  • Helicopter Rotor Frequency Simulation
  • Tracked Vehicle Simulation

High Cycle Fatigue Testing

We are specialists in High Cycle Fatigue (HCF) testing of engine airfoils for service life limit analysis for our clients. High vibrations conditions of airfoils during operation can impact the structural integrity of a test specimen which makes HCF testing indispensable. Individual metallic and future advanced material turbine blades or segments of a bladed disk are tested in the natural resonance frequency range until crack initiation. Our equipment allows us to run a very high number of cycles in a short amount of time simulating a components´ service life. Our HCF service portfolio also includes the ability to carry out strain gauge calibration on instrumented airfoils.

Chopped Air

Exciting high frequencies of larger and relatively stiff specimens requires more specialist testing methods, especially for higher modes. To do this we have put dedicated chopped air testing facilities in place, using a pulsed air flow for aero-dynamical excitation. This world class and unique capability enables Element to handle everything from the smallest to the very largest aeroengine FAN Blades in service today.

Hot HCF Testing

For the analysis of service life limits, individual turbine blades or segments of a bladed disk are tested in the natural resonance frequency range until a crack occurs. In addition, turbine blades are subjected to a realistic temperature load up to 1150°C to take for example creep processes into account.

Windmilling/Sustained Engine Imbalance (SEI)

In case of a compressor or turbine blade failure, heavy imbalances occur in flight, resulting in high vibration levels during“windmilling“ of an aero-engine. Our highly specialized SEI setups are fully capable of demonstrating the survivability of even bigger assemblies under those harsh environmental conditions for certification.

Holography/Modeshape Analysis

Determining the behavior of a component, in terms of its reply characteristics after excitation, is essential to state if it can meet operational requirements. With this specific analysis eigen values and damping factors can be obtained and used in advance of HCF testing to identify relevant modeshapes at various frequencies, nodal patterns and/or validate finite element method (FEM) simulations. An advanced graphical analysis system based on a touchless sensor system (EPSI) detects the smallest deformations via sine-step procedure which helps to identify and interpret these in a standardized way correctly and quick.These results are used by our experienced engineers to run following fatigue test properly and in an appropriate way.

Element facilities also offer:

  • Seismic Simulation
  • Windmilling Vibration Testing (low frequency, high amplitude)
  • Multi-channel digital control systems for our electrodynamic and hydrodynamic shakers