Vibrations are all around us! (and here’s what they mean for excavators)

Vibrations are all around us! (and here’s what they mean for excavators)

Partnerships | VIBES & Doosan Bobcat

NVH (noise, vibration and harshness) comfort is surely essential in the passenger car segment, but also concerns a much broader industry. In fact, whenever people are asked where they would be most bothered by sound and vibration discomfort, examples of in-flight noise from aircraft jets, or vibrations in sleeping cabins on ships always appeal to the imagination.

For VIBES, it is always exciting to put their newest technologies into practice in such areas. Admittedly, most of the technology and expertise that VIBES now puts into software and consulting services has been gained from working closely together with the automotive industry. See for instance this recent post on Transfer Path Analysis and the research and application papers on this page. However, even though a high-tech lithography machine and an offshore wind turbine are very far apart in terms of scale, we often see that the measurement equipment and tools that are used are just the same, and so are the ways of working to gain the most insights out of it.

Last week, VIBES was invited by the company Doosan Bobcat, a leading manufacturer of heavy equipment, to help innovate their sound and vibration analysis and simulation. Their Bobcat division in Dobříš, Czech Republic, develops and manufactures a variety of utility vehicles, such as compact excavators and loaders.

For this occasion, VIBES’ own Maarten van der Kooij and Maarten van der Seijs, experts in the field of the VIBES’ software and TPA, have immersed themselves in the sound and vibration issues of Bobcat’s products. During a 3-day on-site workshop, the potential of new technologies such as Blocked Force TPA, virtual point models and Dynamic Substructuring were discussed. Based on an actual Bobcat vehicle measurement, VIBES demonstrated how to start from simple analysis of time data, and leverage this to build an increasingly insightful analysis:

  1. From just an engine run-up measurement, an Operational TPA analysis can be performed straight away, providing insights in the relative importance of the transfer path’s contributions, including the air-borne path.
  2. By also measuring some transfer functions, for instance with DIRAC software, a Blocked Force TPA can be obtained that leverages the same operational measurement, but yields a characterisation that can be used to predict NVH performance in new-to-design vehicles.
  3. Using virtual points, any measurement on a component can be made compatible with CAE models, such that virtual vehicle simulations become an engineering reality.

All was set up easily in the VIBES Toolbox for MATLAB, using the well-designed interactions between time data, frequency data and transfer functions. Although VIBES’ methodology hasn’t been commonplace in the heavy machinery industry (and neither are the data acquisition systems often seen at the automotive companies) the VIBES Toolbox for MATLAB proved a very successful solution to streamline and set up the various analyses. It was inspiring to see how the resulting analyses were set up in no-time and proved more versatile than many out-of-the-box solutions.

Technology trainings is what VIBES is constantly promoting as the best way to innovate current processes and to see the merits of new technologies in the perspective of everyday engineering. Combined with a growing portfolio of software solutions and engineering services that adapt to specific needs, VIBES is dedicated to solving all sorts of sound and vibrations challenges with all types of companies.

Do you want to know what this can mean for your company? Please get in touch with us!

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For more information about this topic please contact Maarten van der Kooij and Maarten van der Seijs at

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