00:00Acoustic quality is very important in electric vehicles as we don't have a combustion engine
00:06that is running and is masking any unwanted noise.
00:09That means that noise that was previously in the background becomes audible now in the
00:15electric vehicles and this is why we need to focus very much on all the noise sources
00:22that are now audible and then we need to tackle all these sounds and need to treat them separately
00:29so that they are not annoying anymore and of course this is then driving also perceived
00:36quality of the overall vehicle in the end.
00:39We at HMETC developed the acoustic concept of the vehicle together with our colleagues from
00:45the Korean headquarters and the particular focus was on European requirements as we have specific
00:52European conditions like road surfaces and also high speed autobahn driving for example
01:00and we also know from customer research that our customers are very sensitive to high frequency noise
01:07and this is why we designed the insulation system of the vehicle in a specific way to really mitigate
01:14the high frequency noise in particular.
01:15To improve road noise performance we use numerical simulations early in the development particularly
01:22to improve the high speed road noise in robustness.
01:25We selected acoustic tyres to reduce the tonal noise in the cabin.
01:30We also developed carpets and wheelhouse absorbers to lower the overall perceived road noise level.
01:36For wind noise we introduced acoustic door glass and an acoustic windscreen.
01:41These measures significantly reduce the wind intrusion at higher speeds.
01:46The result is a noticeably quieter cabin and a stronger sense of overall quality,
01:51especially when driving on the motorway.
01:55Although electric engines are quieter than petrol or diesel motors they still generate high frequency
02:01tonal noises particularly from components such as the inverter or the DC-DC converter.
02:06Managing these sounds requires significant engineering efforts.
02:11In the EV2 we implemented specific sound package components including the dash inner, the frunk,
02:18the absorber and the underbody cover.
02:20These parts help reduce the high frequency noise and contribute to a well-balanced acoustic performance.
02:27Sound package development covers the careful design and integration of all relevant
02:32insulation and sound absorbing components to achieve a consistent and refined cabbing environment.
02:39We are using acoustic measurements to evaluate how the vehicle performs and we can identify
02:46then where noises are originated and how they travel through the vehicle and so we can make
02:52troubleshooting and we can validate whether the vehicle is acceptable or not in an objective way.
02:58We are here in a so-called chassis dyno and this makes us independent from any weather conditions,
03:07from snow, from ice, from temperature and we can also utilize here different
03:14road shells so we can apply different road surfaces to our rollers so that we can also test different
03:20road surfaces here on the dyno and this makes us very effective and repeatable so we have a very low
03:30influence of any other boundary conditions or influence factors from outside.
03:35The EV2 is a key model for the European customers. It is designed, developed, engineered, produced and sold in Europe.
03:44That naturally brings high expectations from day one. Our goal was to deliver a strong sense of
03:50refinement even in a more compact and accessible EV. What makes the EV2 program different is that we are
03:58bringing the highest level of refinement into this segment. We did not focus on maximizing one specific
04:05acoustic attribute. Instead we aimed to create a consistently high quality acoustic experience overall and that
04:13requires a balanced and efficient approach. We can use simulation tools very early in the development
04:19process. That means that we don't have for example physical prototypes available and we can start
04:24seeking for solutions efficiently and focus on the most promising approaches afterwards in the testing phase.
04:33Sound design in the EV2 serves a clear purpose. It supports the safety and the usability without
04:40compromising comfort. For example the pedestrian warning sound alerts are the road users that the vehicle
04:46is approaching. At the same time it is designed to remain calm and unobtrusive for passengers. The speed
04:54limit assistant sound informs the driver when a limit is exceeded. It has been carefully tuned so that it
05:02provides guidance without becoming irritating over time. The goal is to inform not to annoy.
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