Do you know sound?
When the sound waves generated by the vibration of an object propagate through the medium, a sound is produced. Sounds with frequencies between 20 Hz and 20000 Hz can be recognized by the human ear. But when irregular or random sound signals are frequently generated, the sound becomes annoying noise.
An interesting example in nature is the cicada, which enjoys both the noise it makes and the tranquility beyond the noise. But for humans, constant noise can upset people, be distracted, and even affect work efficiency and cause accidents.
Have you ever been bothered by noise?
Noise in life is known as the invisible killer, and in order to strengthen people's attention to noise pollution, since 2003, April 16 of each year has been officially designated as "World Noise Day". According to statistics, nearly half of the current urban noise comes from social life, of which the noise caused by urban traffic is more common, such as engine roar, whistle, morning and evening rush hour traffic shuttle and so on.
The traffic police can properly control the generation of these noises by investigating and punishing illegal modification of engines, as well as prohibiting honking around communities, schools, and parks. And when we drive or ride in a vehicle, wind noise, tire noise, road noise is the biggest impact on us, when one person, noise will make us bored or even sleepy, when there are many people will affect the conversation communication, a long time in the noise environment, comfort will be greatly reduced. For the third space in people's lives, the car, it is also necessary to face the problem of noise.
Quietness test: a compulsory course for all car companies
Rolls-Royce: The "ceiling" of tranquility
"At 60 mph, the loudest noise in a Rolls-Royce car comes from the electronic clock" – this is Versailles, which was the ultra-luxury brand's pursuit of tranquility in 1958. Hailed as "the quietest car on earth", this car has indeed achieved a certain level of tranquility.
Rolls-Royce has a team of vehicle acoustics experts who fully control the quietness of the vehicle from the very beginning of manufacture. Relying on the brand's exclusive aluminum space architecture, it brings excellent sound insulation performance that far exceeds that of steel architecture, and in order to avoid resonance, the structural design is also more intensive. The engine uses double-frame partitions, and the roof, doors and underbody positions are filled with more than 100 kg of acoustic material. Transparent composite sound insulation materials are applied to the double glazing window glass, and the tires are lined with ultra-light foam... From these details, you can taste the quiet way of Rolls-Royce.
NVH control: a place where all car companies must fight
A quiet and comfortable environment will elevate the driving experience to a higher level. Nowadays, vehicle silence is also an important reference item for consumers when buying a car, and NVH has become a very important comparison indicator. The three letters of NVH refer to Noise (noise), Vibration (vibration), harshness (harshness), which is a comprehensive indicator of the quality of the car, which can bring users the simplest and most direct feeling.
When user demand appears, car companies are also looking for ways to improve the NVH level of the vehicle: laying soundproof cotton in the engine cover is a routine operation, BMW 3 Series lays a large area of native acoustic cotton in the door interior panel, Lynk & Co 03 uses an integrated molding foam material as floor filling; the new Odyssey is equipped with double-layer soundproof glass, and Song MAX also lays a very thick sound insulation cotton above the wheel arch, which has a good isolation effect for tire noise and wind noise during driving.
With the addition of these soundproof configurations, manufacturing costs will certainly rise, but the brand is still willing to do it, in order to bring users a good car experience.
New energy models: The control of NVH has always been very internal
Compared with fuel vehicles, new energy vehicles even in terms of noise control has an innate advantage, but also difficult to escape in the "noise reduction" of the inner coil, and this inner volume from the appearance of the design: smart car aspects, such as Xiaopeng P5 and Ean S Plus, are the use of streamlined body, hidden door handles, active intake grille, these configurations in the reduction of wind resistance, reduce noise at the same time can also extend the endurance, in fact, friendly, and the wind resistance coefficient of 0.223 and 0.211 should also be rolled up.
In terms of tires, Tesla basically uses Michelin, Horse brand such a brand that pays attention to silence, Aian S Plus uses exclusive silent tires for electric vehicles, and Xiaopeng P5 is Michelin PRIMACY 3 ST Haoyue, which is designed for users who pursue super silent effects and ride comfort experience.
NVH control, according to actual tests, Tesla Model S's vehicle noise is 57.2 decibels at a speed of 60km/h, and at the same speed, BYD Qin EV is 86.5 decibels, Xiaopeng P5 can do 57 decibels, and 32 cavity partitions and 40 sound-absorbing cotton pads in the body are the keys to victory and defeat.
For new energy models, there is also a danger that the sound is very low when driving. General new energy models will be equipped with low-speed driving simulation tones, which are used to prompt pedestrians and vehicles. This sound will be emitted at a speed of less than 30km/h, like Xiaopeng P5 will also give users a choice of analog sounds, which not only ensures driving safety, but also will not be disturbed by noise, taking care of every traffic participant.
Movement: quiet space, quiet: comfortable sleep
Just as the same cicadas are chirping, some people feel monotonous and noisy, others feel pleasant, and the judgment of noise is related to people's subjective feelings and psychological factors. In some environments, everything we don't want to see can be called noise.
Studies have shown that the sound of 60 decibels will make people wake up from sleep, during lunch breaks or naps, the normal conversation of others is enough to exceed 60 decibels, not to mention the sudden sound of whistles or decoration drills (100 decibels)... So whether it's "996" or "007", when Chinese workers are slowly losing their sleep freedom, they find it too difficult to take a nap. Too noisy inside, too noisy outdoors. Where else can I go?
Measured data show that the sound of the Mercedes-Benz S-Class at engine idle speed is 42.1 decibels, and the same is the idle state, Tesla only has ambient noise, and the quiet advantage of new energy models is played out again. The noise in the car under the static state of Xiaopeng P5 is 35 decibels, which is better than the requirement of allowing noise level (40dB) in residential bedrooms at night in the national "Residential Design Code" regulations. From this point of view, moving the sleeping space into the car is not completely unrealistic.
For sleep demand, like long-distance drivers in the car to spend the night can only be regarded as barely "make up", there can not be too many requirements for sleep quality; the large space created by the two rear emissions of MPV models is considered to be advanced, but at present only some models can do it, such as Volkswagen Sharon, BYD Song Max, etc., can not be sought. However, if the car is changed, when the user rests in the car, quiet, comfortable, and safe must be taken into account.
The above points, presumably Xiaopeng really thought of it, and introduced the comfortable sleeping space into the family car, and the current Xiaopeng P5 is the only one in the family car. Whether it is from the expansion of space, the concept of car + life or leading new needs, this function of Xiaopeng P5 is really refreshing.
During the lunch break, follow the video operation, remove the aviation headrest, lay the front seat flat, and complete the sleeping space arrangement in 5-10 minutes. The air conditioner is automatically turned on, and the CO and CO2 concentrations in the car are also detected. Xiaopeng also offers three on-board fragrance systems, choosing the scent that makes it easier for you to fall asleep quietly. Of course, you can also choose to turn on the "white noise" mode: with the background light music of the sleeping space, you can fall asleep in the soft music.
In addition to providing comfortable sleep, xiaopeng P5's viewing space, car refrigerator and other configurations are not experienced by other car cars. The quiet interior of the car is also especially suitable for the current camping season. Enjoying the beauty of the sunrise and sunset in such a quiet space, the experience of feeling with your heart is believed to be unique.
Filter out the noise from the outside and better listen to the inner voice
In this noisy world, of course, we want to be able to be free of noise all the time, so that work is more efficient and life is better. But sometimes in a quiet space, the ticking of the clock can make some people feel anxious, and sometimes even if the whistle of the kettle has been calling for half a day, we still don't notice...
Different people's different performances in the face of noise also have an impact on the development and outcome of things. Filter out the noise around you, and all that's left is the real voice inside, which is why some people can concentrate on learning and working in noisy environments.
Similarly, for car companies, at the moment when various brand models are coming, whether they can filter out the noise, whether they can really start from the heart, listen to the voice of users, analyze user needs, and solve user pain points, these are a problem in front of the brand's managers, and even product designers and R & D personnel.
Although the problem is difficult but not beyond the outline, this problem is solved, the product may be able to soar; it cannot be solved for the time being, nor can it be perfunctory.
Just as in the face of NVH control, some brands choose to control costs, and some strive for excellence, and different choice methods make fundamental differences in product quality and reputation. The success or decline of a brand may start with that small piece of soundproof cotton.
For consumers, the choice of car should also listen to the voice of the heart, after all, buying a car is for their own convenience, people are not the best solution, and it is easy to step on the pit when the sword goes sideways. If the car you buy is the best for you, it can also meet the most needs. If you are really sensitive to noise, it should be more appropriate to choose a new energy model. If there is a car with an elegant appearance and an atmospheric interior, NVH also does a good job, and even the needs of sleeping in the car are taken into account for you, will you still not know how to choose?
Noise pollution has invisibly penetrated into our daily lives. Therefore, whether driving or stationary, when the annoying noise is isolated by the quiet space in the car, whether it is temporarily lying flat for the solitary self; or proper noise reduction and listening to each other, it is a kind of reconciliation effect on the boring heart. It is said that the persistent noise is the loudest in the sudden stop, and at that moment, we seem to understand the heart of the cicada.