Regardless of the sound of the engine, the hum of gears and bearings, the sound of the road surface hitting the wheels or the wind blowing through the car body, the cabin space should be guaranteed to be a pleasant place to be.
More than cool. From door closing to engine starting and running, the sound quality should match the person, vehicle and brand.
To do this, the hammer is an extremely important tool. This is not an ordinary hammer that can be purchased at a hardware store, but a hammer that costs thousands of dollars.
theo autopionThe data collected from running a hammer on a car not only ensures that the car makes pleasant sounds and runs normally, but also helps confirm that the car will not explode (if any other special effects Not there).
Resonance can make the car noisy
An important aspect of car manufacturing is resonance management. One of the most familiar parts is probably the engine muffler.
When a car is running, the engine isn’t the only thing making noise. Every part, from the powertrain to the air vents in the cabin, will “sing in tune” like the instruments of an orchestra.
If there is a solid “conductor”, the product will be a charming melodious melody. On the contrary, it is a “symphony” full of noise that gives listeners headaches.
In the case of cars, the “conductors” are the designers and engineers. Every part must be adjusted to avoid producing irritating sounds.
To solve the problem, you need to find the input factors.
To resolve unpleasant vibrations, you must first locate the relevant frequencies. To do this, engineers use a special test hammer.
Why use a regular Hummer that costs the same as a used car, rather than a regular Hummer that costs much less? Theoretically, you could also check for vibration using your hands. But many types of effects are seen during use. Without a test hammer, engineers would have to try all kinds of things and this would be much more expensive than buying a hammer.
In addition, it is difficult to measure the input effect using conventional instruments, but the test hammer is different.
The test hammer is specifically designed to record input impact forces without the need for multiple support devices. Additionally, there are several tips to simulate a variety of effects, from soft like a rubber pad to sharp like metal.
Of course, you don’t just need to hold a hammer to knock, you also need to know how to knock. According to autopionThere is no dearth of novice engineers who used the hammer so uncontrollably that they not only dented the roof of the car but also damaged the hammer used and the data collected during that process also became useless.
Several ways to remove unwanted vibrations
Generally, bosses will not like engineers whose job is to test vibration and noise. Because from their findings, the car may often need a lot of adjustment. For example, stopping the “internal combustion” process (impossible), completely redesigning (expensive), strengthening stiffness or damping (can be done although it also comes with cost problems).
Thanks to technology, today’s processing solutions are simpler than ever before. Many problems were solved early in the design phase. Of course, there are still many types of vibrations that can only be tested on a finished car.
Active noise cancellation technology helps reduce many “problematic” sounds. This technology is similar to noise-canceling headphones, works well and is much cheaper than redesigning the entire structure.
Adjusting specific RPM is a “fun” solution. For example, when the vehicle accelerates from a stop (0 km/h) to 1,500 rpm, a spontaneous detonation often occurs, especially during the process of reaching the 1,100 rpm mark. Therefore, engineers have programmed the car to ignore speed at this RPM, so that the resulting detonation is not noticeable. Obviously, adding a few lines of code would be much cheaper than redoing the entire powertrain.
Electric vehicles are on their way to becoming popular vehicles in the future. Compared with internal combustion engines, electric vehicles will not have vibration problems when burning fuel.
But electric cars have their own problems such as being more sensitive to vibration frequencies (being very quiet, even the smallest vibration can cause discomfort), and having to accelerate faster with higher engine RPM. ability can easily cause problems. A sudden change of state due to “shock”.
Needless to mention, manufacturers also had to find ways to create “fake” noises so that the car wouldn’t be so quiet that it would be unsafe.
(TagstoTranslate)Automotive Industry(T)Car Manufacturing(T)Sound(T)Safety Technology(T)1000 Questions Why