Operational Deflection Shape (ODS) Analysis

With an Operational Deflection Shape (ODS) analysis you can visualise the relative movement of the structure in a 3-dimensional animation.

ODS analysis provides powerful insight into the actual vibration shape and hereby identifying where modifications should be placed.

Operational Deflection Shape (ODS)

Vibration is not just the source, it is the structure too

When solving a vibration problem, the vibration source matters, but so do the structural properties of the asset. An imbalance in a fan will often create vibration, the same applies to pressure pulsation-related vibration in reciprocating compressor and pump systems.
What ODS analysis delivers
1
Visualises relative movement in a 3D animation, showing how the structure responds in operation.
2
Pinpoints where structural modifications or additional pipe clamps should be placed.
3
Helps quantify how imbalance, misalignment, and pressure pulsations contribute to total vibration.

Vibration amplitude often depends on the structural properties of the whole asset, including foundation, base frame, piping, and connected components. ODS measurement is especially useful when vibration reduction cannot be achieved by eliminating or reducing the source alone.

Operational Deflection Shape (ODS)

Vibration is not just the source, it is the structure too

When solving a vibration problem, the vibration source matters, but so do the structural properties of the asset. An imbalance in a fan will often create vibration, the same applies to pressure pulsation-related vibration in reciprocating compressor and pump systems.

Vibration amplitude often depends on the structural properties of the whole asset, including foundation, base frame, piping, and connected components.

What ODS analysis delivers
1


Visualises relative movement in a 3D animation, showing how the structure responds in operation.

2


Pinpoints where structural modifications or additional pipe clamps should be placed.

3


Helps quantify how imbalance, misalignment, and pressure pulsations contribute to total vibration.

Our Solution

Whatever the situation, AVT Reliability BV (formerly Van Geffen Reliability) has an experienced team of vibration and dynamics experts who can perform ODS analysis.

What you get
Animated geometric models that reveal the vibration shape of the structure, combining the forcing function with the dynamic properties of the asset.
Forcing function, tied to operating conditions
The forcing function depends on operating conditions. For machinery, this can be influenced by engine speed, load, pressure, temperature, and flow. For civil engineering structures, ambient forces such as wind, waves, and traffic may also apply.
FEA modelling to predict modes and natural frequencies
Mode shapes and natural frequencies can also be predicted using Finite Element Analysis (FEA) models. These use discrete points connected by elements representing the mathematical properties of the structure’s materials. Boundary conditions define how the structure is fixed or supported, as well as the loads applied. This data helps our engineers design structures and understand vibration characteristics.

Our Solution

Whatever the situation, AVT Reliability BV (formerly Van Geffen Reliability) has an experienced team of vibration and dynamics experts who can perform ODS analysis.

What you get
Animated geometric models that reveal the vibration shape of the structure, combining the forcing function with the dynamic properties of the asset.
Forcing function, tied to operating conditions
The forcing function depends on operating conditions. For machinery, this can be influenced by engine speed, load, pressure, temperature, and flow. For civil engineering structures, ambient forces such as wind, waves, and traffic may also apply.
FEA modelling to predict modes and natural frequencies
Mode shapes and natural frequencies can also be predicted using Finite Element Analysis (FEA) models. These use discrete points connected by elements representing the mathematical properties of the structure’s materials. Boundary conditions define how the structure is fixed or supported, as well as the loads applied. This data helps our engineers design structures and understand vibration characteristics.

Offering

Depending on the exact problem and application, we perform different types of ODS measurements.

Time based ODS

Used to investigate the vibration pattern of a structure as a function of time during transient events like loading or heating.
Spectral ODS

Used to investigate the vibration pattern at a specific frequency, for example during steady state operation.
Non-stationary ODS

Used to investigate the vibration pattern at a specific frequency as a function of rotational speed or time.

Offering

Depending on the exact problem and application, we perform different types of ODS measurements.

Time based ODS

Used to investigate the vibration pattern of a structure as a function of time, during transient events like loading or heating.

Spectral ODS

Used to investigate the vibration pattern at a specific frequency, for example during steady state operation.

Non-stationary ODS

Used to investigate the vibration pattern at a specific frequency as a function of rotational speed or time.

Applicability

Due to the properties of these specific measurements, ODS investigations have wide applicability across industrial and civil structures. A selection of typical applications is shown below.

Large offshore compressor system including piping
Excitation frequency, 2.5 order vibration.
Factory floor
Excited by a nearby pick-and-place robot unit.
ID fan
Excitation frequency, 1st order vibration.
Large reciprocating slurry pump
Excited by multiple pressure pulsation frequencies.
Bulk conveying system, including bridge construction
Excited by ambient forces such as wind.

Applicability

Due to the properties of these specific measurements, ODS investigations have wide applicability across industrial and civil structures.

Large offshore compressor system including piping
Excitation frequency, 2.5 order vibration.
Factory floor
Excited by a nearby pick-and-place robot unit.
ID fan
Excitation frequency, 1st order vibration.
Large reciprocating slurry pump
Excited by multiple pressure pulsation frequencies.
Bulk conveying system, including bridge construction
Excited by ambient forces such as wind.

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  • Expert support and consultation

EU Flag

Local service backed by global support

  • 24 hours a day, 7 days a week, 365 days a year
  • Clear detailed reporting with actionable insights
  • Expert support and consultation

 

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AVT Reliability BV

Uilenwaard 7
5236 WB, Den Bosch
The Netherlands

Phone: +31 (0)73 – 642 81 89
E-mail: admin@avtreliability.eu
KvK 16053743
BTW NL8089.90.251.B.01

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