Following the successful completion of the Extreme Cold Test and the Extreme Heat Endurance Test, the bmw i7, a new generation of THE BMW 7 Series pure electric models, is currently undergoing acoustic testing at the BMW Group Research and Innovation Center (FIZ). Through rigorous and extensive acoustic testing, the BMW i7 will achieve the best SOUND insulation, aeroacoustics and ride comfort that BMW has ever experienced. With its insight into the future, the BMW Group implements sustainable development in its corporate strategy and actively promotes the future of mobility with innovative technologies. As a brand new model, the BMW i7 for the first time perfectly combines the exclusive luxury, respect and comfort of the BMW brand large luxury flagship sedan with zero-emission pure electric driving, which is a strong confirmation of the BMW Group's comprehensive speed-up electrification strategy and product line expansion, and fully demonstrates the BMW Group's determination to lead the large luxury car segment.
Acoustic performance is one of the key factors in ensuring driving comfort. The BMW i7 is currently in the final acoustic testing phase before mass production. R&D engineers will conduct a series of complex and rigorous acoustic tests for the BMW i7 prototype, as well as other models of the new BMW 7 Series, incorporating a variety of potential noise sources into the test scope to ensure the excellent noise reduction and sound insulation of this all-electric large luxury flagship sedan and the excellent driving experience of its peers.
At the BMW Group Research and Innovation Center (FIZ), BMW test and development engineers tested the BMW i7 in a comprehensive range of sound release and absorption, analyzing in detail the acoustic characteristics of different dimensions such as motor and rolling noise, aeroacoustics and vibration noise. The tests also precisely adapted to the BMW IconicSounds Electric simulation inside the vehicle. As the latest achievement of the BMW Group's innovative digitalization, BMW electric vehicle acoustic simulation will be applied to the BMW i7 model, which is jointly created by the BMW Group and the internationally renowned composer Hans Zimmer, which will bring the driving pleasure of electric driving to the driver and occupants.
The BMW i7 is committed to setting new benchmarks in the large luxury car segment, and the acoustic comfort of the vehicle will be one of the most crucial standards. At the BMW Group Research and Innovation Center, acoustic test benches have been specially designed to meet the requirements of electric vehicles, simulating the driving sound and tire noise of vehicles on various traffic surfaces around the world. Engineers can not only record all irritating noise during testing, but also selectively eliminate it in the development of the BMW i7, thus helping the vehicle to achieve unparalleled acoustic comfort in all road conditions.
At the same time, the BMW Group attaches great importance to the noise-free power transmission of the motor, and has carried out acoustic optimization and motor noise reduction package for the electric drive unit of the BMW i7, so bmw i7 owners can enjoy the unique mute effect of the motor, and can also open the emotional charm of the "BMW electric vehicle sound wave simulation" and enjoy the electric driving fun exclusive to BMW owners.
In order to be able to test the effectiveness of all noise reduction measures under extreme climatic conditions, BMW Group's R&D engineers simulated the climate environment around the world, analyzed and optimized the noise sources. For example, at very high and low temperatures, the acoustic performance of the vehicle's air conditioning and ventilation systems is carefully tuned.
In the acoustic wind tunnel experiment, the aeroacoustic performance of the BMW i7 was further improved. The BMW i7's simple and sleek body surface, recessed door handles, aerodynamically optimised rearview mirrors and almost completely enclosed underbody not only reduce the air resistance of this large luxury sedan, but also help create exceptional acoustics.
In addition, R&D and test engineers have conducted detailed analysis and precise optimization of electromagnetic compatibility (EMC). Engineers exposed the BMW i7 prototype to a powerful electromagnetic field to test the sensitivity of its electrical system to electromagnetic interference. Test engineers can analyze test results in real time to ensure reliable operation of vehicle suspension control systems and auxiliary systems, as well as interference-free reception of online data, telephone, broadcast, video and navigation signals.
In addition to the noise and vibration emitted by the vehicle itself, the noise sources outside the vehicle can also affect the comfort of the driver. Engineers effectively test the sound insulation in the car by simulating everyday traffic conditions, including road construction sites and noise generated by trucks as they pass by.
Thanks to the use of innovative materials, the BMW i7 will provide better sound insulation. Sound-absorbing materials are incorporated into the pillar trims, seats, roof pads and rear shelves, effectively shielding the vehicle from noise inside and outside the car. Soundproof glass windows can effectively control the outside noise through the glass into the car, bringing a more perfect driving experience to the BMW i7. Plush fabrics are fitted with doors, window frames and wheel arches to reduce noise when the vehicle is moving. In addition, the stiffness of the front of the body has been greatly enhanced, and the foam absorbing layer has been used on the inside of the tire to further reduce noise, thus raising the noise reduction and comfort of BMW's first pure electric luxury flagship sedan to an unprecedented level.
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