For this kind of project, numerous discussions and site visits are necessary, including a pre-sales visit to the technical department regarding the setup and installation of the new equipment in the specially designed building, which was then still under construction. To get acquainted with the new requirements of the plastic industry, in-depth discussions were had with Mr. Dufour, responsible for the Lens Novares laboratory.
Mr. Dufour explained the plastic issue:
“When it comes to the automotive industry’s criteria for material that will be used in the near future, plastic remains the reference material due to its potential for mass gain and flexibility. The final products must be recyclable, which is already a challenge, as they contain recycled material whose properties are ultimately too variable and the recycling channels too weak. Plastics must be able to withstand the increasingly delicate moulding requirements and the higher under the bonnet temperatures of 3-cylinder engines – small displacement engines that are becoming more common due to their enhanced performance." said Mr. Dufour, and continued:
"The Lens Center of Excellence is constantly involved in improving the performance of this material and, for example, integrates increasingly sophisticated oil and air separation systems (decanter) into its engine head covers. Plastic is still a lighter material, but the vibration profiles to which it is subjected have also evolved with engine size and require even more rigorous design to avoid premature wear and breakage of parts. In addition, vehicles must be quiet despite the increasing stresses induced by vibration, and plastic plays a significant role in noise reduction. HBK was able to take all these criteria on board and guide us towards the best possible solution with a shaker capable of carrying out a very wide range of our current and future tests, a future leaning towards the evolution of electric and hydrogen engines."
- Current specifications involve testing at relatively high levels of acceleration, and unusual test times of several hundred hours. This long duration requires the shaker to be reliable and regularly maintained, and this was important when choosing a solution. HBK’s flexible and adaptable maintenance plans fitted Novares’ requirements perfectly. The tests carried out by Novares included:
Testing the vibratory integrity of individual parts by fixing them directly onto supports, representative of their final environment
- Testing complete systems with large dimensions requiring stand-alone slip table HBT1220 – an integrated combo system equipped with a horizontal table with hydrostatic bearings that are highly resistant to the overturning moments generated by the transverse reactions of the products being tested. A table of this type has a large mass, requiring a powerful shaker but is perfectly suited to the 90 kN power of the V8900
In addition to the effects of vibration, plastics behave differently in different temperatures, so most vibration tests are performed in a climatic chamber. The V8900 system and its slip table have been optimized for easy adaptation to the different climatic chamber models a
available on the market.
Vibration tests combined with climatic tests are one of the most representative of the real environment and the most effective in terms of immediate results that can be used to understand the products tested.