/// AUTOMOTIVE ACOUSTICS TESTING \\\
Flagship EV undergoes environmental testing
The BMW i7 electric vehicle has endured acoustic, vibration and climatic testing to meet the expectations of the EV market
O
ptimised noise insulation, aero-acous- tics and vibration comfort. These are some of the challenges that have been
facing BMW engineers in developing their electric vehicle range. While all three of these factors have always been important to con- sumers, the sources, transmission and miti- gation of noise and vibration have changed substantially with vehicle electrification. The acoustic and vibration signature of an elec- tric vehicle is entirely different from that of vehicles with conventional or legacy power- trains. To meet the demanding market require-
ment for top-of-the-range automotive prod- ucts, the developers of the new BMW i7 have put the car through a diverse range of tests in the company’s own laboratories and test benches. The environmental test facilities at BMW have been equipped and configured to provide development and test engineers with
the ability to perform all the testing pro- grammes that are required, including acous- tic, vibration, climatic and electromagnetic compatibility testing.
BMW i7 \\\ The BMW i7 is an electric vehicle with a
combined power consumption of 22.5– 19.5kWh/100 km according to WLTP measuring
and CO2 emissions of 0g/km, based on tests performed so far. It is being developed with the aim of combining the latest in automotive powertrain technology with the level of com- fort required in the market. One key factor in this respect is the acoustic properties. The level of well-being in the interior of a
purely electrically-powered luxury saloon car is largely determined by the degree to which disturbing noises can be kept away from the occupants. There are a variety of potential noise sources to be taken into account, so
near-production prototypes of the BMW i7 – and indeed all other model variants of the fu- ture BMW 7 Series – undergo an extensive pro- gramme as part of their acoustic testing.
BMW laboratory \\\ At the extensive facilities in the Research and
Innovation Centre (FIZ) in Munich, test and de- velopment engineers are able to check the full range of the vehicle’s sound emissions and propogation to make assessments of its noise, vibration and harshness (NVH) charac- teristics. Motor and rolling noise are analysed in detail, as are the aero-acoustics and vibra- tion levels, in order to fully determine its acoustic properties and NVH characteristics. This also includes precise alignment of acous- tic pedestrian protection and the motor sound emitted in the interior of the BMW i7 – the latter having been developed as part of BMW IconicSounds Electric, a collaborative
12 /// Climatic & Vibration Testing \\\ 2022
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40
