Using vibration diagnostics for consumer goods reliability

Ensuring the reliability of heating and refrigeration circuits, the Valliant Group’s Center of Competence uses vibration diagnostics to understand and predict damaging resonances in systems and components such as piping and compressors
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Royston - Hertfordshire - England

Oct. 1, 2012 - PRLog -- Located in Vitoria-Gasteiz in Spain, the Vaillant Group’s Center of Competence (CoC) develops and approves Refrigerant Circuit Modules (RCMs). These RCMs are the core of both the aerothermal and geothermal heat pumps manufactured by the Vaillant Group. Heat pumps are one of the key product segments for the Vaillant Group’s renewable energy strategy.

When it came to ensuring the reliability of their RCMs, the CoC chose a vibration analysis system from Brüel & Kjær. Development and Innovation Engineer Javier Oleaga said: “We were looking for an instrument which would enable us to accurately characterise the vibration of a refrigerant circuit module, in order to assure the quality and lifetime of the heat pump. When we decided to buy equipment to measure and analyse vibration signals, our partner - the University of Mondragón -recommended Brüel & Kjær’s vibration systems to us.”

In this test procedure, the objective is to find the frequencies at which the excitation frequencies of the compressor can generate resonances (large-amplitude displacements), which cause fatigue and breakdowns.

This requires measurement of the natural frequencies of the pipes, which move in three dimensions. Triaxial accelerometers are placed in key positions on the critical pipes. Then the piping is excited with a purpose-designed impact hammer made by Brüel & Kjær.

The obtained result is a series of Frequency Response Functions (FRFs), showing the natural resonant frequencies and the amplitudes of the piping at those frequencies. The acceptance criteria are to check the correct shape of the time signals (force and acceleration), the autospectrum of the force, and the shape of the coherence in each measurement. If they are correct, the measurement is validated and the results are considered reliable.

The full Valliant Group case study is available on:


About Brüel & Kjær
Brüel & Kjær is a world-leading manufacturer and supplier of sound and vibration measurement systems. Brüel & Kjær helps its customers measure and manage the quality of sound and vibration in their products and in the environment. Focus areas are aerospace, space, defence, automotive, ground transportation, airport environment, urban environment, telecom, and audio.

Brüel & Kjær has an unparalleled portfolio of sound and vibration equipment, and is a renowned deliverer of innovative instrumentation, including sound level meters, microphones, accelerometers, conditioning amplifiers, calibrators, noise and vibration analysers and software. To see the full range of products and systems, please visit

Brüel & Kjær also runs a variety of training courses, from basic introductions to noise and its effects to more specialised classes teaching customers how to get the most out of their equipment. Free, online training courses - conducted by our expert engineers - run throughout the year too. For all course registration details visit

Brüel & Kjær is a subsidiary of UK-based Spectris plc ( which has annual sales of £1.1bn and employs around 7,500 people worldwide across its four business segments.

For additional information please contact:
Heather Wilkins
Marketing Coordinator
Bruel & Kjaer
Telephone: 01763 255 780
Source:Bruel & Kjaer
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Phone:01763 255 789
Zip:SG8 5BQ
Tags:Bruel, Kjaer, Sound, Vibration
Industry:Engineering, Construction
Location:Royston - Hertfordshire - England
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