Testing Services for Modal & Vibration Analysis

Modal analysis and vibration analysis are types of vibration testing services that are essential in engineering design process and determining the outcome of the failure analysis.

To perform each analysis, Innovative Test Solutions, Inc. (ITS) has a range of equipment including accelerometers, electro-dynamic shakers, and a digital holography system.

What Is Modal Analysis Vibration?

Modal analysis converts vibration signals on a complex structure into a set of modal parameters easy to perceive. This helps determine the movements of different parts of the structure under loading conditions such as lateral force.

The modal analysis vibration system also allows us to identify and characterize vibration modes.

The vibration modes show up as fringes on the turbine blade. These fringes are dark bands on the image that read like a topographical map when showing areas of excitation.

The software supplied with the system allows the operator to peak the amplitudes of the modes and take a snapshot of the mode shape.

Digital Holography System

Our digital holography system has the capability to perform mode shaping for a wide range of frequencies and components.

The Modal Assurance Criteria (MAC)

Correlation of mode shapes can be achieved using the modal assurance criteria (MAC) feature.

MAC is a scalar value between zero and one representing the correlation between two mode shapes.

A MAC value near one indicates a high degree of correlation or consistency between two mode shapes. In this case, the two mode shapes represent the same motion differing only by a complex modal scaler factor (MSF).

The MSF can be used to scale the mode shapes to a common level for subsequent manipulations. This may include differencing the mode shapes to understand the variance or combining the mode shapes to improve the estimate.

Thermal Expansion

The thermal expansion system can measure displacements at right angles to the line of sight.

The resulting fringes measure thermal expansion or unidirectional strain. Time-lapse recordings can be used to collect data for stress relaxation studies.

Impact Hammer Testing

Impact hammer testing utilizes software to record the resonance response of a component to map modal frequencies. This would result in a constant amplitude in the frequency domain.

In real-world scenarios, such an impulse might not be possible. Instead, we determine a contact time. The duration of this time is directly linked to the frequency content of the force applied.

In impact hammer testing, ITS uses a special hammer with a load cell in its tip to measure the force of the impact.

Our system can obtain modal frequencies of up to 40 KHz on a variety of different component shapes and sizes.

For more information regarding our modal and vibration analysis services, please request a quote below.

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