The comfort of a car is an important factor that affects everyone's purchase of a car. So, what is the key to determining the comfort of a car? Some would say chassis suspension. Indeed, how the suspension is adjusted has a great impact on the comfort of the vehicle. For example, for models that pursue comfort, generally speaking, the suspension is adjusted to be softer.
But is vehicle comfort really only determined by the suspension? Obviously not, whether a car can give people a comfortable feeling, in fact, the atmosphere of the car is also very important, including the seats that are in close contact with our bodies, the vibration and sound insulation control of the whole vehicle, etc. If these are not paid attention to, the comfort of the vehicle will also be greatly reduced.
Many people may not be aware of the fact that the R&D and design of seats and sound insulation engineering are also close to "metaphysics", and their R&D complexity is no less than that of the chassis. Take the Teana as an example, and give you some popular science!
Teana focuses on home and business, and what they want is comfort, so comfort will be the main orientation, but "comfort" is a word with a very personal feeling. How to reflect "comfort"? Engineers have "reference answers".
For example, the seat of Teana has a six-dimensional evaluation system for the definition of seat comfort, including the softness of the seat, the fit between the seat and the human body, the support of the seat to the human body, and the posture of the human body when turning. performance, seat vibration absorption when driving on the road, and fatigue resistance during long-distance driving.
Engineers develop car seats through these real-world evaluation systems.
"Utopia" is there, and it will be realized later. Taking Teana as an example, engineers will develop molds based on the analysis results of the data and the evaluation of the above-mentioned comfort system.
In terms of car seats, Nissan has some "secret weapons" of its own, such as zero-gravity seats, SLAB structure + high attenuation foam, spring frame structure, etc. It sounds complicated, right? In fact, as long as we simply understand, they are all conducive to improving the comfort of the seat.
Since all kinds of "tall" "secret weapons" have been used, what is the effect? It doesn't matter who says it, engineers need data from both the test machine and the experts.
In the Nissan factory, there are all kinds of seat testing machines, some with simulated strength, some with simulated seating area, some with simulated load-bearing, and the research and development cost of a "simple" seat is still quite high. of.
But no matter how many machines there are, the seats are still for people to sit on, so the opinions of experts are also essential. These experts have an interesting nickname within them - "fine ass". Therefore, they are very "mean" and demanding. Often an expert is "unhappy", and the seat has to be rebuilt. According to the manufacturer, the research and development cycle of their seat is similar to that of the whole vehicle. This also explains from the side why these mainstream B-class cars can have such a comfortable ride experience.
The seats have good comfort, and NVH is also in place. If the sound insulation ability is poor, and all kinds of wind noise and road noise are endless, it will also be disappointing. NVH is a three-letter abbreviation, where N stands for "Noise", V for "Vibration", and H for "Harshness".
Nissan's models also have a strict NVH development process. In the early stage of development, manufacturers will conduct market surveys to study the car habits and car environment of target customers. For example, the Teana is a B-segment car that is suitable for both family and business. According to its positioning, the control of NVH will naturally be very strict. If it is Sima, because its positioning is more sporty, then its NVH effect may be more "on-the-spot".
In addition to the strict development process, the supporting development resources are also very important. For example, the semi-anechoic chamber of the rotating hub for the test below is quiet. In this anechoic chamber, materials with very good sound absorption are laid on the walls, and the entire anechoic chamber has no Sound reflections, almost absolute silence in the room. Only in this kind of laboratory-like adjustment conditions can we ensure the rigor of development and the accuracy of testing.
Uncle Brick experienced the sound insulation effect of Teana in the anechoic room. He rolled all the windows up, and the data displayed by the decibel meter was 33.9dB. According to the noise standard, between 30 and 40dB is a normal and quiet environment. And if the window is rolled down, it shows 70.3dB, so the sound insulation effect of the Teana is still very effective.
With a good test environment, interference sources can be better identified, and NVH development is more tailored. If the wind noise is large, Nissan engineers will upgrade the front windshield of the Teana to acoustic soundproof glass, which can improve the noise reduction ability in the high frequency region.
As for the control of the sound and vibration source, generally speaking, the vibration of the engine and its accessories is unavoidable, and the metallized upper mount will aggravate the occurrence of these noises. Nissan's solution is to replace it with high-strength rigid resin. The upper suspension, in this way, can significantly and effectively reduce the occurrence of noise.
The above is about the factors that affect the comfort of the car. Of course, if you want to know more or want to purchase, you are welcome to come and consult.