To evaluate the sense of a car, we are basically consumers through subjective evaluation method.
For example, button damping, softness armrest surface of the sleeve, the evaluation method is used by hand. 99.9 percent car reviews articles, media workers did the same.
However, automotive OEMs are doing research to verify the time will certainly be more rigorous, often using quantifiable data.
For example, key sensor damper, automotive engineers key acquisition operation of the sensor “force – displacement” curve, by adjusting the key installation, this control in a curve people feel most comfortable in the space. Why do we feel good damping luxury car key sense, it is because of a lot of evaluation in R & D validation phase.
But today we are to break the routine, to introduce the “subjective evaluation” project will use a number of automotive engineers, and for everyone “to deification.”
1, “smell” – Evaluation Subjective odor
uses a large number of automotive plastic parts, painted parts, adhesive or the like, which are irritating odor, usually when we look at a new car I will be very concerned about this issue, even if the heavy smell back down is also possible.
such as car poly Jun cousin last month saw a luxury car models, but full of joy to disappointment, and asked the reason is because the odor can not accept (just because there is a baby).
Thus car manufacturers, car interior odor evaluation is important.
but the surprise is that we say smell evaluation, OEMs, and we do not particularly different from the actual test method is the result of the laboratory personnel trained to smell through the nose, in order to determine the odor level.
major OEMs are now set up their own “golden nose team”, in fact, that is the thing.
▲ and we have to say any different, probably these professionally trained “Golden Nose” sense of smell.
You may want to say, and the reason dignitaries to assess, because the smell is also impossible to quantify, scientists are still not fully clear principles smell of animals.
but this is not accurate, such as the electronic nose can be quantified odor.
The electronic nose was simulated animal olfactory organ to develop a high-tech products, also known as the smell of a scanner, a 1990s developed a novel instrument for rapid detection of food.
For technical features, it is the instrument by a selective electrochemical sensor array and method of identifying suitable composition can identify simple and complex odor, can be obtained consistent with the human sensory evaluation result .
electronic nose applications include environmental monitoring, product quality testing (such as food, tobacco, fermented products, flavors and fragrances, etc.) and explosives detection. But why not pursue automotive electronic nose it?
The reason you may not believe, the main reason is the industry standard is not unified, nobody pushed. We still more accustomed to using the traditional manual identification method. Although old, but simple, and evaluation by many people, is able to describe the general phenomena. As for the mechanism which metaphysics, dig it for posterity.
2, “hearing” – a subjective evaluation of noise
In addition to “smell”, there are “listening” subjective evaluation.
we take the instrument panel vibration and noise tests, subjective evaluation method is used.
For example, such a standard is required (only taken part):
▎ press as percent middle spectrum 35, 50 percentages, 75 percentage, the percentage 100 for noise test.
▲ “spectrum path” refers to a car running when the vibration information, the information is collected down to form a “spectrum path”, it is like the same song Gepu . Status
▎ test below.
Evaluation of the test is such ▎.
Why do quantitative evaluation of it? The smell is metaphysics, but the noise can at least still more conventional equipment acquisition, Taobao tens to hundreds of noise tester grasping a lot of it, certainly not to implement them smell so difficult, right?
In fact, the reason why the use of the above methods, it is because too many pieces integrated dashboard, and evaluate the overall noise and not enough “comfort”. To put it plainly is, the sub-components of the dashboard is a potential abnormal sound a small point, which requires us to evaluate targeted. But his microphone noise equipment acquisition will interfere with each other, so it can only be screened by the human ear.
Therefore, we can see the results of such evaluation under the table, it really is the performance of each component are inconsistent with it.
Of course, we can to explain a different angle, that is the outlet, duct, display, steering wheel, instrument panel body and the like, large parts of the respective sub- It may be different parts suppliers supply. We do product development verification when needed responsibility to the people who Whose pot back, so we have to weed out interference between the various sub-components.
3, “visual” – the appearance of subjective evaluation
say may not believe, automotive research and development verification, the appearance of subjective evaluation is very common.
For example, we take a very conventional high-temperature durability test, the test is to simulate parts (mainly plastic) after experiencing high temperature endurance, will not be significant deformation, gloss changes, such as discoloration .
Of course, these can be determined by us seizure, gloss meter, color difference meter, but in fact a large number of tests were directly subjective evaluation gets the job done. Because of the time, manpower and equipment costs to be much higher, and held the money is not no one is willing to dig. Since the naked eye can not see, there is usually no problem default.
4, “touch” – subjective tactile evaluation
Now we feel more and more critical and stain resistance of the fabric. Like Alcantatra skin is like a lot of OEMs, because it’s a good feeling, and soiled stains can be rubbed directly with water removal.
▲ If the bottom, in fact, not Alcantara leather, which is successfully developed in the 1970s one kind of imitation leather, polyester component is 32 percent and 68 percent polyamino carboxylic acid ethyl ester, but the texture is very close to turn fur.
But unfortunately, now that the evaluation method related to the sense of touch is more subjective evaluation. Such as by flexible, silky feeling suchWords to define the touch. To give you a more personal experience, many luxury brands will set up a special store to show their sense of fabric.
For example, the Aston Martin last year in Shanghai, a store on fire, because they will be open to a store located in the old district Siping Road, Yangpu District 1028 get. There is no car, it is to display material technology.
that you have to ask, it was not the sense of touch can not quantify it?
also not true friends.
For example, known Mingke Si record company provides a tactile own views for quantization method, mainly by the friction coefficient (of CoF), deformation of the polymer, micro-hardness and modulus to synthesize four data determined. But for many reasons, this model has not been widely implemented.
▲ Korth Chong (Covestro) is the world’s leading supplier of high-tech polymer materials, their measurement strategy is of great reference significance.
car poly Summary
we introduced the above “smell”, “hearing”, “vision” and “touch” four kinds of subjective evaluation. You now know that, in fact, believe in automotive R & D quantization parameter is not 100 percent.
for automotive engineers, the quantization parameter is naturally good, but because of the principle of means testing is not enough persuasive, costly, time-consuming and other reasons, it is difficult to implement. So we do not deify work of Automotive Engineers, and sometimes they have to rely on subjective experience of it.