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Demcon Bunova, being a part of the Demcon group and together with additional partners in the region, has access to extensive facilities for testing. These tests are often used to verify the outcome of simulations or to determine missing (material) properties. Over the years, Demcon Bunova has gained a wealth of knowledge and experience in setting up and executing test programs.

Wind tunnel

Demcon Bunova cooperates with wind tunnel facilities in the Netherlands for the verification of aerodynamic properties of an object. In a wind tunnel, the flow around a model can be visualized with for example, smoke, tufts (wires), video or other visualization techniques.

Often, but not always, use is made of a scale model. In order to set up a good and representative experiment, there must be sufficient similarity between the scale model and the original object. In addition to the required proportional scaling of the dimensions of the original, equality of the Reynolds number is a prerequisite.

Usually a scale model is used that fits within a test section of 0.7m by 0.9m meter. In this way subsonic tests with speeds up to about 0.20 Mach can be conducted. This is sufficient for the vast majority of applications such as cars, trains, gliders, road bikes, skaters, etc.

The use of a wind tunnel always comes in combination with guidance (test procedures / reporting) from Demcon Bunova.

Demcon Bunova has hands-on experience with the theoretical and experimental side of aerodynamically optimized construction. Please contact us at an early stage for the design and verification of your product.

Sound measurements

Demcon Bunova has a 64-channel digital microphone system at its disposal. This microphone, also known as a sound camera, can determine the exact location of a sound source in decibel (dB) in addition to the noise level (SPL). Especially determination of the location of the source is distinctive. The sound camera, together with the accompanying advanced software, enables us to visualize sound (sources, frequency, intensity, etc.). Supported with this intelligence Demcon Bunova is able to help you in a very focused way, for example:

  • Find the root cause of an unexpected and unwanted noise found in a prototype.
  • Provide design advice to bring down the noise production level from an exciting product.
  • Troubleshoot severe noise problems in the field. This is possible with for example industrial machines, apparatus, products and even for buildings.

Where necessary, we can also use an anechoic chamber or reverberation room for measurements where it is important to avoid or maintain reflection of sound.

The high level specification of our sound camera are:

  • Digital MEMS microphone array with 64 channels and 16x16cm area
  • 1 integrated HD video camera
  • Real-time spectrum, time-frequency and far field beam forming analysis.
  • Near- and far-field sound imaging ready·
  • Near-field frequency range: 1Hz – 20kHz·
  • Far-field frequency range: 300Hz-20kHz with optimal conditions at 1.2kHz – 15kHz·
  • Brand: Sorama

For one of our sister companies, Macawi (developer of breathing devices), we managed to get the noise level up to 6 dB below the applicable standard with the help of the sound camera without compromising the performance of the module.

Demcon Bunova has hands-on experience with the theoretical and experimental aspects of sound. If you have a sound problem or if you would like to design a product sound optimal way then please contact us.

This is a picture of the sound camera

Climate chambers

Demcon Bunova has access to a number of climate chambers and rooms. These rooms and chambers are mainly used to  perform temperature (cycle) tests on thermal sensitive products and equipment. These test can be used to demonstrate that a product has the capability to function (for a long time) within the tolerance limits and under a certain atmospheric circumstance (temperature / air humidity). In some cases it the testing of containers that are specially designed to keep a product thermally stable during transport. In this case, the temperature inside the container is logged under the influence of a temperature profile on the outside.

Together with our partner Demcon Kryoz we have extensive knowledge and experience in the field of thermal management.

Specifications small climate cabinets:·

  • Temperature range up to -75 ° C to +180 ° C·
  •  Relative humidity of 10% to 98%·
  • Dimensions up to 100cm x 100cm x 100cm

Specifications large climate chambers:

  • Temperature range up to -60 ° C to +90 ° C·
  • Relative humidity of 10% to 100%·
  • Dimensions up to 8m x 6m x 4.5m (l x w x h)·
  • Possibility to simulate solar radiation.

The rooms can be set to run through a certain temperature profile over time.

In many cases these tests are carried out according to IEC 60068 “Environmental testing”.

We also have access to a temperature shock chamber. Using this chamber it can be investigated whether a product can withstand a prescribed thermal shock. This is particular used for composite material and electronics. The use of these climate chambers always takes place in combination with guidance (test procedures / reporting) from Demcon Bunova.

Demcon Bunova has hands-on experience with the theoretical and the experiment side of temperature management. If you want to design and/or test in a thermal optimal way and/or use a controlled climate environment, please contact us.

Picture of a climate chamber

Pressure drop measurements

In some cases is it not possible or useful to fully simulate a flow section. An example is the modeling of a flow that consist of a membrane filter. In these cases a ‘black-box’ approach is used in which the filter is simulated as a so-called ‘porous medium’ with effective resistance coefficients. This resistance coefficient can, if necessary, be determined by Demcon Bunova in an experimental way by using the following set-up.

The set-up consists of a flow channel that can be equipped with a ‘porous medium’. Pressure and temperature sensors in combination with a flow meter make it possible to determine the pressure drop. The obtained results are subsequently used to allow proper modeling of the flow.

Demcon Bunova has hands-on experience with the theoretical and experimental side of porous media in combination with piping systems. Contact us if you need support to determine the most optimal layout for your system.

This is picture of a pressure drop measurement test rig
This is schematic view of the pressure drop test-rig