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Technology / Engineering guide
Wind Turbine Vibration & Rotor Balance: Record Review
A vibration record needs its measurement definition and machine condition. Retain the sensor location, recorded quantity and rotor configuration so the responsible engineer can interpret changes without jumping to an unverified balance diagnosis.
Review comparable measurements before assigning a cause.
Keep the measurement setup and component identities with every vibration or balance record used in a service discussion.
01 / Assembly identity
Name the rotating and supporting components represented.
Record the turbine model and applicable rotor, blade and hub identities, together with documented changes.
Record the turbine model and applicable rotor, blade and hub identities, together with documented changes. Distinguish rotor-assembly information from a generator component’s own balancing record. A statement about one component does not automatically characterise the complete installed turbine.
Keep blade sets and assembly versions traceable when reviewing historical results. Glass-fibre blade material is confirmed for MARSTON, but it does not supply a rotor balancing grade, tolerance or vibration limit. This guide makes no such product claim.
02 / Measurement point
Retain the location and direction of the observation.
Name the measured component or structural location and use a referenced drawing or existing approved photograph to describe it.
Name the measured component or structural location and use a referenced drawing or existing approved photograph to describe it. State the direction of the recorded motion and the sensor or instrument identity. A value without its measurement point cannot support a consistent comparison.
Record the documented measurement method and mounting condition from the existing assessment. A change of point or instrument may change what is observed. This page requests records; it does not instruct personnel to attach sensors to an operating turbine or approach moving equipment.
03 / Quantity & band
Identify what the reported number represents.
Displacement, velocity and acceleration describe different aspects of motion and use different units.
Displacement, velocity and acceleration describe different aspects of motion and use different units. A peak, peak-to-peak or RMS summary also has its own meaning. Keep the quantity, statistic and measurement frequency range together instead of comparing values solely by their numerical size.
An overall summary and a frequency spectrum provide different information. Preserve the original labels and relevant measurement settings. This guide supplies no amplitude threshold, sensor specification or accepted frequency band for a MARSTON model.
04 / Operating context
Compare readings under identified machine conditions.
Retain the available rotor-speed, output and operating-state information with the observation, including the time reference.
Retain the available rotor-speed, output and operating-state information with the observation, including the time reference. If a condition is unavailable, mark it as missing. Do not treat different speeds, operating modes or assembly versions as a single comparable trend.
Describe when an observed change occurred and the records available around it. Correlation with a maintenance event or weather condition is context, not proof of a failed part. The monitoring-data guide covers signal availability; this page covers mechanical record interpretation.
05 / Balance evidence
Separate a specified balancing task from installed vibration.
A balancing record should identify the assessed rotor or component, applicable method, conditions and specified acceptance basis.
A balancing record should identify the assessed rotor or component, applicable method, conditions and specified acceptance basis. The public scope of ISO 21940-11 concerns rotors with rigid behaviour; it should not be assigned automatically to a complete wind rotor of unknown classification.
An installed vibration observation and a component’s residual-unbalance assessment are different evidence. A low overall value does not by itself demonstrate a claimed balancing grade, and an observed vibration change does not establish that field balancing is the required remedy.
06 / Support review
Prepare a traceable observation pack.
Send the equipment and assembly identities, relevant prior records, measurement definition and event description to the responsible support team.
Send the equipment and assembly identities, relevant prior records, measurement definition and event description to the responsible support team. Retain the original data where available and state the review question without presenting a suspected cause as established.
Applicable service decisions require the model-specific documents and authorised assessment. This page provides no correction-mass placement, rotor adjustment, balance-test procedure or repair threshold. Requested measurement or balancing capability remains subject to the actual supplied scope and evidence.
Continue the review with Wind Turbine Factory & Site Acceptance: Evidence Planning.
Continue the review with Wind Turbine Measurement Calibration & Uncertainty Review.
Continue the review with Wind Turbine Availability, Downtime & Missing Records.
Further project guides: Small Wind Turbine Mechanical Loads: Forces, Moments & Cases · Wind Turbine Tower Dynamics: Frequencies, Modes & Excitation · Wind Turbine Extreme-Wind Design: Site Data & Operating Limits.
For an additional distinction within the rotor-balance review, see static and couple unbalance.
General background: ISO 21940-11 public scope: identity and applicability of a balancing assessment. These references explain industry concepts; they are separate from the applicable MARSTON product and project documents.
Prepare the information for this review.
Use the checklist to organise the project information. Mark unavailable items and retain document references.
| Review item | Information to provide | Purpose |
|---|---|---|
| Rotor identity | Turbine, blade set, hub and relevant assembly versions | Match observations to the assessed assembly. |
| Measurement point | Location, direction and instrument identity | Make records comparable. |
| Measurement definition | Quantity, units, statistic and frequency range | Interpret the reported value. |
| Operating condition | Time, speed, output and known mode | Retain comparison context. |
| Balance evidence | Assessed object, method, conditions and acceptance basis | Separate component and installation conclusions. |
Engineering questions.
Does any vibration change prove rotor unbalance?
No. Describe the observation and its conditions for a qualified review; do not assign a cause from the change alone.
Can acceleration and velocity numbers be compared directly?
They represent different quantities and units. The definition and frequency range must be retained.
Does a generator balancing record prove the whole turbine is balanced?
It identifies the assessed component and scope. The complete rotor and installed assembly require their own applicable evidence.
Does this page specify a MARSTON balancing grade?
No grade, residual-unbalance tolerance or vibration threshold is claimed.
Does ISO 21940-11 automatically apply to every wind rotor?
Its published scope concerns rigid-behaviour rotors. Applicability to the actual assessed assembly requires review.
What information helps a support case?
Assembly identities, existing measurements and settings, operating context, prior records and a precise description of the observed change.
Technical enquiry
Bring your project information to the discussion.
A vibration record needs its measurement definition and machine condition. Share the available information and the equipment scope you want reviewed in a technical quotation.