How is the effect of sound insulation and noise reduction of the whole car, and is it necessary?

Car sound insulation is a system engineering, first of all, to understand the origin of car noise. Generally speaking, when a car is in the driving state, it will produce three types of noise: engine noise (engine noise), wind noise, and road noise (noise caused by tires coming into contact with the ground during driving). What we usually refer to is generally road noise and machine noise insulation.

Road noise and machine noise insulation is mainly to use sound insulation materials to wrap the compartment to achieve the purpose of noise reduction, this project mainly includes the laying of sound insulation cotton on the floor of the compartment (including four wheel shells) to achieve the purpose of reducing road noise, the front of the car is to carry out four-sided sound insulation (left, right, rear, up) to achieve the purpose of reducing machine noise, if you want to have a better sound insulation effect, then the chassis is armored spraying (that is, chassis armor), from the perspective of reducing resonance to reduce noise. Generally speaking, there is no effective way to reduce wind noise, but if the wind winding plate (also called the wind wing) is installed, the body surround and other ways to change the drag coefficient of the front of the car body, so as to achieve the purpose of reducing noise to a certain extent.

Unless you have the tools and know a lot about the structure of the car, it is not advisable to do your own sound insulation. Generally, sound insulation is carried out for the cabin sound insulation package, as well as the upper sand board of the engine room is laid with sound insulation cotton, plus the chassis armor spraying, to achieve the purpose of noise reduction. If you want to insulate the left, right and rear sides of the cabin, you have to use special tools to lift the engine before laying soundproof cotton.

The sound insulation material must be good, you can consider the United States solid shield, especially the cabin sound insulation, but also make the cabin more difficult to dissipate heat, if in the process of sound insulation wiring (due to the laying of sound insulation cotton, will inevitably make part of the cabin and compartment wires re-laying) problems, the summer heat is easy to lead to spontaneous combustion of the car. Therefore, the choice of service providers must also be service providers with excellent technical capabilities. What is the chassis armor.

Chassis armor", that is, spraying a layer of protective glue on the chassis of the car, as if adding armor to the steel plate of the car chassis, armor is just a figurative title. The main function is to prevent rust, and secondly, it can also reduce the noise transmitted from the chassis to the cab.

Now the factory cars, it may be that the manufacturer has done very little to protect the chassis for cost considerations, most of them are only coated with a thin layer of anti-rust materials, and some even do not take any measures. These cars feel that the chassis is very fragile, the bumps on the road, flying stones and other noises are very clear, this kind of chassis, how can it not be corroded and deformed for a long time? Therefore, most cars need to do chassis armor, and it is best to do it as soon as possible when a new car is in order to prolong the life of the car.

Old cars can't be ignored, and prevention is the best policy.

The whole car sound insulation is that the whole car is stuffed with sound insulation materials, including the front fender part and engine cover, as well as the trunk and center console seats in the car. There are two mainstream materials currently used in sound insulation materials. One is a shock absorber and the other is a soundproof cotton.

Compared with these two materials, the pollution of the shock absorber plate is much greater than that of the sound insulation cotton.

It is not recommended to do the whole car soundproofing.

The first is that after the complete car sound insulation, the pollution will be very large, and it will also have an impact on people's health;

The second is that the effect does not meet your expectations after the sound insulation, and it does not have the effect you imagined;

The third is that after the complete car sound insulation, the weight of the car will increase, and the fuel consumption will also increase.

The fourth is to modify the car without authorization, which will be very troublesome in the follow-up car, and if something goes wrong with the car, you have to bear it yourself.

Whether it is necessary: It is very important for car enthusiasts who have installed car audio, especially those who emphasize the hearing effect, it is very important to do the whole car sound insulation, because car sound insulation can not only improve the sound quality of the speaker, but also play a role in preventing tire noise, road noise, wind noise, about 3 to 5 decibels.

Advantages: noise reduction, improved sound quality, and thermal insulation effect (when turning on the air conditioner, due to the good thermal insulation effect, it can save fuel consumption).

Disadvantages: After the complete car sound insulation, the weight of the body will increase by about 40 kg, which may have a little impact on the power system, and the weight will increase and fuel consumption will also increase. But the fuel consumption of this weight is far less than the amount of oil saved by the air conditioner.

1. The location is a high-speed section, the road condition is very good, there are very few potholes, seams of the road section, and most importantly, the selected road has less traffic, so the carrying and elimination will not affect the accuracy of the test.

2. Comparison of noise data before and after sound insulation (unit: decibels) Noise speed 60km h80km h120km h original state after four-door sound insulation, the whole car is reduced after sound insulation.

3. From the data point of view, the noise of the whole car is reduced by 60km h, 80km h and 120km h respectively compared with the original factory noise data9 and decibels, there is still a certain improvement.

Views on the installation of soundproofing materials in the later stage:

1. There are many reasons for the noise affecting the vehicle, the most important of which is from the body vibration, engine noise, road noise, tire noise, wind noise, body cavity stool pants (cavities) and air convection, etc., and it is also inextricably related to the body structure design, glass thickness, chassis and materials.

2. Especially the noise generated during the driving of the car, there are low-frequency, medium-frequency and high-frequency, so it is impossible to improve the overall noise in the car by just relying on the current practice of shock absorber plate + foam + white cotton. <>

1. If in order to reduce noise, the effect of making a door is not very large, and there is no need to make a door if you don't change the horn.

2. However, the sound insulation of the whole car generally includes the door, which is more preferential, and the later modified horn does not need to be a separate door. 3. The sound insulation of the whole car includes: hood, fender, chassis, tail box, tailgate, 4 doors, ceiling, firewall, U-shaped slot, and the sound insulation of the whole car does not include the roof, firewall and U-shaped slot.

4. The fender is mainly tire irritable, the chassis is road noise, the firewall is the engine, and the 4 doors are dry.

5. Because every car will have windows, even if the 4-door sound insulation is done, the wind will not weaken much, because the sound insulation of the window is impossible to do. Therefore, even if you do 4 doors, the effect will not be too obvious. If you want to change the horn, it is a must; If you want to have a noticeable effect, we recommend:

Do the fender, chassis, and tail box, so that the effect is more obvious. If the effect of making a door is not too great for noise reduction, there is no need to make a door if you don't change the horn.

However, the sound insulation of the whole car generally includes the door, which is more preferential, and the later modified horn does not need to be a separate door.

The sound insulation of the whole car includes: hood, fenders, chassis, tail box, tailgate, 4 doors, roof, firewall, and U-shaped slot.

Generally, the whole car soundproofing mentioned by the store does not include the roof, firewall and U-shaped slot.

The fenders are mainly tires, the chassis is road noise, the firewall is the engine, and the 4-door is windy.

Because every car will have windows, even if you do 4-door sound insulation, the wind will not weaken much, because the sound insulation of the windows is impossible to do.

Therefore, even if you do 4 doors, the effect will not be too obvious. If you want to change the horn, it is a must;

If you want the effect to be obvious, it is recommended to do it on the fenders, chassis, and tail box, so that the effect is more obvious.

There is no murmur, and the outside will not affect you.

It is effective for the car to do the sound insulation of the whole car. The reason why some good cars have good sound insulation effect is because they have thick skins, and the principle of sound insulation is to increase the thickness of the skins. The hood, fender, chassis, tail box, tailgate, 4 doors, roof, firewall and U-shaped groove should be made, and each part is made of two layers, a shock absorber plate and a sound absorbing cotton.

The sound insulation of the whole car includes: 1. Door sound insulation: four-door sound insulation usually adopts a three-layer sound insulation method, one layer is the car sound insulation of the inner cavity, the second layer is the outer layer of car sound insulation, and the third layer is generally the sound insulation cotton treatment at the interior panel, and the effect of the vibration stop plate is to strengthen the sheet metal thickness and reduce resonance.

2. Chassis sound insulation: the chassis is generally low-frequency noise, and the vibration absorbing plate is used to stop vibration, and the sound-absorbing cotton is used to absorb medium and high frequency noise.

3. Trunk sound insulation: In the process of driving the body, the buffer of soundproof cotton will also reduce the impact on the bottom sheet metal when the trunk vibrates. Since the trunk lid is also a part that is easy to conduct noise, soundproof cotton is added to it to absorb high-frequency noise.

4. Hood sound insulation: It is active noise in the whole car, and it is also the only active noise in the whole car. In the process of working the engine, it will make mechanical noise due to the ignition of the engine, as well as the blasting sound of gas combustion during ignition.

Sound insulation can only be a psychological effect greater than the actual effect, the whole car sound insulation is done, less than 5 decibels. I remember a ** TV station did a similar experiment with the same car, one did the whole car sound insulation, one did not do it, after driving the test on the same road at the same speed, it was found that the decibels of the whole car sound insulation only dropped by 4 decibels, so it was concluded that the sound insulation of the whole car at such a large price was the least cost-effective in the modification, but the tire change was more reliable than sound insulation.

It worked, it definitely worked! But it still depends on individual needs! If it is very noisy, it is recommended to do the following whole car sound insulation.

Professional sound insulation and noise reduction construction content 1. Door sound insulation engineering: mainly solve wind noise and road noise. 2. Hood engineering:

It is mainly effective in isolating the noise and heat insulation in the engine compartment, and effectively protecting the paint surface. 3. Trunk engineering: mainly solve road noise and noise, and significantly improve the high-fidelity sound effect in the car.

4. Chassis and tail box sound insulation project: mainly solve the low-frequency incoming chassis, steel plate resonance noise, and friction sound of interior parts. 5. Fender engineering:

It mainly effectively reduces the noise generated by tires when driving.

1.Soundproofing. The car sound insulation process can effectively eliminate and block the engine noise source, vibration, resonance of the body door, friction sound with the road surface and air resistance when driving, etc., giving you a quiet driving space and greatly improving the comfort of driving.

2.Strengthen the body. The non-key parts of the body hood, doors, trunk compartment, roof, and fenders are relatively weak, and after the installation of automobile sound insulation materials, the body is stronger, and in the event of a collision, it is passive.

3.Optimize acoustics. The audio, especially the subwoofer mounted at the rear, causes the trunk to vibrate and the sound effect is reduced, which is because it is not done. Look

When driving, there are also a lot of car owners, they feel a lot of headaches about the noise made by their cars, they all think that their cars are noisy, the sound insulation effect is poor, they like to listen to ** while driving, can not enjoy the noisy**, let me tell you, it is best to do the noise of the whole vehicle, but it is still necessary to look at personal needs, if the noise is very large, it is recommended that the noise of the whole vehicle, noise, if the car is not big, do four-door sound insulation and sealing strips are also particularly good sound insulation effect, part of the analysis of different car noise, In terms of general types, the origin is annoying noise engine, chassis, reduced wind sounds, body resonance, etc., let's take a look at how to solve these problems together.

The first engine is soundproof, itself for a new car that has just started feeling that the engine is very loud, but it seems to be normal in the part of the engine that is checked, this is the main noise through the front fender and other vibration sensitive sounds in the cab, you also feel very excited and abnormal, for this case, there is no way to deal with the noise later, so everyone says that you need to do acoustic modifications to the engine cover, and the sound insulation material with quality assurance can suppress vibration and can also absorb a lot of noise.

The second door is soundproof, and we can often see the windows and body of the car in our lives, there will be some gaps, such as a certain gap between the high and the car, but the analysis of the vibration of the car is that there will be friction in this process, and friction collision can produce noise, so in this case, we can install insulation, which can not only play a role in sound insulation, but also minimize the damage to the car.

The third chassis is soundproof, the internal noise in addition to the engine itself, as well as the noise of the road surface at the bottom of the car and tire friction, through the chassis transmission to the chassis can also do sound insulation transformation, used to eliminate and cut off the noise of the outside of the car, chassis sound insulation transformation, from the surface of the chassis a layer of chassis armor, chassis armor is a layer of elastic sealing material, can be used for external sound insulation and noise reduction, is also the external protection chassis project that most vehicles will do, so in this case, The use of some sound insulation strips can effectively help us solve the problem of high noise in the car, and at the same time, it can also effectively make our car more one day, and the damage to the windows and body will be very small.