Do you have to find out about the source of the noise of your vehicle? In everyday city car environment, you might have heard these voices. “Pop”, that is the road when the tire is issued by the deceleration noisy; bustling, is the noise coming from the surrounding environment; “Woo H ~ – ‘This is the throttle, noise from the engine.
However, when your speed exceeds 80km / h, the world seems “quiet” down. Or, around you all the noise, is mostly covered by one kind of white noise, it is a “whistling call” sound, and we used to call it – wind noise.
Display latest consumer research results, consumers complain of wind noise in the aligned position of TOP5. The reason why wind noise will be among the highest in the list, with its own characteristics of a great relationship. Since wind noise monotonous repetition frequency and bandwidth, high strength, and therefore, the driver is prone to irritability, mood and the like fatigue under the influence of white noise in the time of long-distance driving, thus affecting the safety car. Therefore, not only wind noise control and noise reduction an important part, but also improve traffic safety an important part.
Although for many consumers, they have not realized the importance of wind noise, but virtually Deeply affected. By contrast, a part of the heritage and has a prescient car enterprises, the early focus on the top of it, such as the September 16, Chang’an Chang’an models of its -UNI-T conducted a public wind noise test.
Chang UNI -T to the wind noise test sites on the China automotive Engineering Research Co., Ltd. (hereinafter referred to BARI) wind tunnel laboratory, which is currently the largest wind tunnel laboratory. The reason why the site on here,BARI because the wind tunnel around the walls and top are mounted sound-absorbing material, combined with the acoustic pressure throughout the process and the flow passage ripple regulator can make the background noise environment to achieve a very low level. Meanwhile, in the experimental wind speed reaches 140km / h when the ambient noise is only only 58 decibels, is one of the quietest wind tunnel. In this background noise, acoustic testing of vehicles will undoubtedly be more accurate.
but only if so, it is only to make it more accurate result, occupants in different wind noise And how true that feedback in it? In this regard, experts in the field of international senior Changan Automobile Aerodynamics and Thermal Management Code introduced the Sun network: “In order to simulate a real visual noise to hear the occupants in the car, wind tunnel experiments also requires human head and spherical arrays and other equipment through the microphone installed in the ear position, while recording the sound, you can simulate the impact on human shoulders, head and ear and other parts of the sound field, play back the sound signal close to the actual human ear to hear. ”
Chang’an UNI-T project director Tan Yong said so, “we all know that for a camera, the pixels the higher the more pictures are clear. Similarly, a microphone like a pixel, the more finer the microphone to take the image, but the image is a plane, so we need the top and sides of the acoustic camera simultaneously shoot, then the matched synthesis computer can construct a 3D image a noise distribution. “
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above, we learned the importance of wind noise, wind tunnel laboratory of authority and expertise, but the key is Chang’an UNI- T are already on the market, and now only to wind noise testing, is this not in mice when consumers take? Are wrong, in fact, long before the listing, Changan Auto has been optimized for wind noise were consciously Chang UNI-T.
mirrors and rear wing, Chang’an UNI-T for wind noise made two key optimization. In UNI-T tail design iconic example, due to the UNI-T tail design uses a hollow roof air will impact the V-shaped channel through the holes and down into the rear window, to form a large wind noise, which gives Wind noise optimization has brought no small problem. To this end, the team was called Chang’an CFD 4000 nuclear simulation resources, calculating the amount of more than 1 million CPU hours, roughly equivalent to the amount of computation 12 years of high-performance PC processor, compressing the entire calculation period to 20 days. During this period, the team made a total of more than 60 optimized computing solutions, and ultimately find more than 20 active programs, dramatically reducing the wind noise generated by the tail.
In fact, only minor modifications to the shape of the tail, it is possible to design modeling, regulation, CAE and many other products departments, the UNI-T not only the difficulties, it is optimized for the new car mirrors. It is reported that, after mirror optimized, enabling the total sound pressure level at the ear of the driver is reduced 0.3dB (A). Just look at 0.3dB this value is not high, but there are a lot of wind noise on the details of the optimization on the UNI-T, add up, eventually making the car appear excellent level of wind noise tests.
From the results point of view, even at 120km / h winds, Changan UNI-T also have a good performance to the industry average of view, it has reached a relatively good level. It can be said behind this achievement, actually it contains Changan Automobile tireless efforts and the pursuit of the details of the product design team.
All along, technological innovation and design innovation are almost always stand on the opposite. But Chang UNI-T, we seeForced to design innovative technological innovation does not take the unusual way, which not only allows designers to have more right to speak, but also allows the technical team has accumulated more new engineering experience. Perhaps precisely because of this new breakthrough, listed near the UNI-T, in August this year, sales exceeded the million units, since listing has sold over 3 million units. Thus, “Chang technology” is not a slogan, it truly reflected in the Chang’an UNI-T body.
(Source network, intrusion deleted)