What is the sound insulation effect of the car?

Hello. pkx

Level 9. 2009-04-07Why do you need car soundproofing? Today, whether it is home audio or car audio, as long as you are looking for high-quality sound experience, then.

Reducing ambient noise is one of the most necessary tasks.

Have you ever had this kind of experience, when other riders ask you why you don't install a good set of audio equipment, you can only be:

The car is so noisy when it drives, and it is a waste to install such good equipment! Three years ago, we were ashamed to encounter a lot of such questions.

I actively started to study car sound insulation, and the result was echoed by the majority of car friends, only to know that there are so many people who are eager to do so.

Quiet and comfortable inside the trunk.

I believe that car owners who have changed cars have one experience, that is, when a new car is bought, it feels the best to drive, quiet and solid, and stable.

Shu again. Suitable, but after driving for a year or even 1 or 2, I feel that some parts of the car, such as the chassis and doors, are loose, or.

There are many abnormal sounds, which are mainly due to the poor assembly quality of the car factory, and the humid climate or the rear installation of some accessories or disassembly.

Some of them are not strictly reloaded. Let's ask which car owner doesn't want his car to be driven for a few more years, don't 2

After 3 years, the car looks like it's going to fall apart, and I want to change to a new one.

We've also seen a lot of friends install subwoofers, and as a result, the door trim panels vibrate, making it a lot of value.

The sound is not capable of working at its best. Car soundproofing can make up for the problems that a new or old car will encounter, it can be excepted.

In order to strengthen the structure, it can also strengthen the steel plate of the chassis, avoid premature metal fatigue, and make up for the gap caused by long-term vibration.

The abnormal sound caused by poor disassembly and assembly has the function of anti-rust, which improves the bass quality of the audio, so that the car can drive for a few more years.

Feel stress-free, more comfortable, more secure, the same.

It can also save 1 vehicle replacement. Let's say you want the acoustics.

If it's better than 1 point, you shouldn't hesitate. Imagine.

1 Xiali flower on a few hundred yuan to have the feeling of a high-end car, so.

The investment value is too high! What are the benefits of soundproofing my car? 1. For private cars: protect your physical and mental health, care for your family, improve the quality of the car, and enhance the comfort of riding.

2. For business vehicles: running on the highway, the quiet environment in the car enables you to achieve a good negotiation atmosphere.

For audio lovers: Eliminate bass afterglow and improve the overall effect.

Specifically, the sound insulation project of the Sanzheng car audio of the system is generally completed through three steps: shock absorption, noise reduction and sealing.

First of all, the four doors, trunk, floor, engine compartment and roof were dampened.

When implementing shock absorption treatment, there are primary and secondary: first of all, the door and trunk, because most of the noise is transmitted into the car through the suspension system, trunk, chassis, doors and other parts of the car; followed by the car floor and engine compartment; Finally, there is the roof.

secondly, the whole car is sound-absorbing and noise-reduced;

Finally, the interior of the car is sealed.

Right. When the car is sealed, do not over-seal, because the car body sealing project is the basic project to solve the noise transmission from the outside to the inside, the car body should be well sealed, so that the air pressure in the car is balanced, otherwise, excessive sealing can cause hypoxia in the car, bringing danger to your body. Because the noise in the car is not easy to concentrate on the control, therefore, there are higher requirements for the quality of construction products and construction technology, under normal circumstances, professional acoustic products are better sound insulation products, which include two kinds of materials, sound insulation pads and sound-absorbing cotton, sound-absorbing pads are pasted in the car body to produce vibration parts, and sound-absorbing cotton can absorb the noise generated by the vibration that the shock-absorbing rubber can not deal with.

Under normal circumstances, when implementing the car sound insulation project, it is necessary to paste a layer of sound insulation pad and a layer of sound absorbing cotton.

After the construction of the general sound insulation project, the noise can be reduced by 2-3 decibels, and good materials can reduce the noise in the car by 5-8 decibels, and in the best case, it can be reduced by 13 decibels.

In addition, only making a fire retaining wall cannot achieve the purpose of better sound insulation.

It's not bad, it's much better than before I didn't get it. The most important thing is to protect your car.

The follow-up modification has always had some damage to the car, so let's see for yourself!

The sound insulation of the whole car must be effective, but whether the effect of the sound insulation modification of the whole car is obvious is mainly affected by two factors, namely:

1. Modification technology of auto repair shops.

2. The advantages and disadvantages of automobile sound insulation materials.

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.

In the process of driving, the car will produce some noise more or less, for the general family car, there is no need to modify it aggressively, and for some noise that is too loud, it will not be tolerable. I can't stand it, but I can have the sealing strip on the door.

Common materials for car sound insulation:

1. Foam sound-absorbing material.

To put it simply, the physical properties of foam with low hardness and low rebound absorb the energy (heat) of sound waves and release them slowly. Of course, the heat of sound waves is very small.

2. Shock-absorbing composite materials.

Shock-absorbing composites are composite materials that can absorb and convert vibration energy into other forms of energy (such as heat energy) and dissipate them, thereby reducing mechanical vibration and reducing noise. In fact, the shock absorber plate we usually use is a shock-absorbing composite material!

3. Soundproof cotton (heat insulation cotton).

Sound insulation cotton is not only the role of sound absorption, more importantly, it has a relatively good heat insulation effect, after pasting in the hood of the car, it can avoid the high temperature generated by the engine directly to the hood, so that the paint on the hood can be protected, the speed of aging can be slowed down, and the rain can also avoid the rapid evaporation of rainwater on the hood when it rains, resulting in fog that affects the line of sight. Safety first, what should be done or what must be done!

It has obvious effects, you can use a decibel meter to do a test before you do it, and then do a test after doing it, there is still a big difference.

There is still a certain effect. But it is also limited to the local sound drop do not have too high expectations, wind noise, tire noise, engine noise, sound insulation good cars generally have superior manufacturing pliers tailored welding process, as well as some good sound insulation layout.

The car is definitely effective in soundproofing, to give a simple example, driving a van is compared with a million-dollar luxury car, sitting in the car, it is obvious that you can distinguish between soundproofing and not soundproofing.

The effect of soundproofing the whole car is good, the car noise is large, and the car noise is divided into two categories: one is the noise generated by friction during the driving of the vehicle, such as wind noise and road noise; The second is the noise generated by structural vibration. The noise perceived during driving needs to be transmitted through a certain medium – air, a solid that is physically connected to the noise source.

The details are as follows:

The whole car needs to be equipped with a sealing strip for the whole car to be soundproofed. In addition to high-end cars, the whole car sealing strip of general automobile manufacturers is a cost-saving product, of which recycled rubber is a large part, and a large proportion of the sealing strip is recycled rubber. Therefore, to insulate the whole car sound, it is necessary to plug the sealing strip with better quality on the inner wall of the automobile sealing strip.

The method of arranging the soundproof sealing strip for the whole car is as follows: the sealing strip is fixed around the door, the sealing strip is fixed on the skeleton around the door opening, and the sealing strip is installed on both sides around the door, around the door and around the door opening, so that the car is double-installed.

Engine soundproofing cotton.

For the sound insulation in the engine room, buy a piece of wave-type sound-absorbing cotton (the smell of fire prevention is more unpleasant than that of fire prevention), and then buy a can of spraying glue. Spray glue in the engine compartment when it is not hot, and then apply the sound-absorbing cotton to the hood.

Sound insulation strips are attached to the inside of the door and at the joints.

Door frame sound insulation, you can buy sound insulation cotton strips or sound insulation rubber strips, or sound insulation wool felt strips pasted on the seams of the door frame, that is, to complete the door frame sound insulation. In this way, the sound of wind shearing and some noisy noises coming from outside the car can be effectively suppressed.

A, B, C pillars are attached to sound-absorbing cotton or foaming agent.

A, B, C pillars sound insulation, reinforcement. The cavities on the A, B, and C pillars are filled with about 40% foaming agent with PU foaming agent (because it will foam and expand), which can effectively prevent the abnormal sound caused by metal vibration and increase the rigidity of the car body, and complete the sound insulation project of the A, B, and C pillars.

The chassis is soundproofed and requires professional operation.

Due to the complexity of chassis sound insulation, it is generally not recommended to operate personally, and this needs to be done in a professional car modification shop for sound insulation. The main thing is to remove the seat and upholstery, and then paste soundproof cotton or sound-absorbing cotton.

Tailbox soundproofing. Affix sound insulation materials to the tail box, and the wheel eyebrows on both sides of the tail box can not be missed, which can effectively reduce the tire noise road noise and the noise caused by the tail row, and at the same time will effectively reduce the low-frequency resonance noise caused by the bass part. Most of the tire noise and road noise when the car is driving at low speed are suppressed, the stability of the car is greatly increased, the chaotic noise and falling apart feeling when crossing the potholes and uneven roads are gone, and the shock absorption and cushioning performance of the vehicle is significantly improved.

Car sound insulation is divided into several major sections: shed roof. Four doors.

Trunk. Rotors. Canopy.

Chassis. If you want to do a good job of sound insulation, you must choose suitable sound insulation materials, such as sound insulation cotton, cotton absorption plates, shock absorbers, aluminum foils, etc. Sound insulation is carried out according to the different noise** of each vehicle.

If you want to do sound insulation, it must be the best sound insulation effect of the whole car.

This depends on which part you think your car's main noise **, wind noise is big to do four-door and chassis, if the tire noise is large, you can do the fenders, chassis and rear trunk sound insulation.

If you have strong hands-on ability, you can try to do it yourself:

1. Door sound insulation:

Four-door sound insulation usually adopts three layers of sound insulation, one layer is the inner cavity of the car sound insulation, the second layer is the outer layer of car sound insulation, and the third layer is generally the sound insulation cotton at the interior panel.

The effect of the damping plate is to strengthen the thickness of the sheet metal and reduce the resonance.

2. Chassis sound insulation:

The chassis is generally low-frequency noise, while the vibration-absorbing plate is used to stop vibration, and the sound-absorbing cotton is used to absorb medium and high frequency noise, which is the most for low-frequency noise.

The effective is still the low-frequency sound barrier.

Riders who pursue the ultimate sound insulation can choose to use a low-frequency sound barrier to do it.

3. Trunk sound insulation:

The trunk will often put things, and in the process of driving the body, the cushion of soundproof cotton will also be reduced when the trunk vibrates.

Small impact on the bottom sheet metal. Since the trunk lid is also a part that is prone to noise conduction, a soundproof cotton is added to it.

Absorbs 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. The engine will be due to the lead in the process of working.

The ignition of the engine undergoes mechanical movement.

And the mechanical noise is emitted, and there is the blasting sound of gas combustion during ignition, and fatigue in the metal.

Before should. It is time to protect your body and put a layer of sound insulation, which can not only strengthen the strength of the metal, but also delay the fatigue of the metal.

This kind of sound insulation generally needs to be done by professionals, because when installing sound insulation equipment materials, many auto parts and the like need to be disassembled, as long as professionals can ensure that the disassembly is complete and undamaged.

I firmly believe that many car lovers have a headache about the noise of their own vehicles, and are ready to make a soundproof modification to the car. Is it reasonable for a car to be soundproofed as a whole car? How much does it cost to complete the soundproofing of the car?

Indeed, the whole car sound insulation is the best effect in the car sound insulation, but it is necessary to do the whole car sound insulation or depending on the situation, otherwise all cars are made full car sound insulation, which is very costly. Because there are some cars, their own sound insulation effect is not low, or only a certain part of the sound insulation is not in place, at this time there is no need to do the whole car sound insulation, only for a certain part of the sound insulation will have a very large effect.

The whole car sound insulation is a systematic modification project, from the first we can see how many processes, which means that the whole car sound insulation is very car dry an internal plastic surgery, if there is a slight impropriety or not very technical professional, it is very easy to cause complications to the car. Therefore, car soundproof modification must find a reliable and professional modification shop to do.

According to the different sound insulation raw materials, the price of the whole car sound insulation will also have a certain difference, expensive to go to 78000, cost-effective 34000 is also available, but we propose to choose reliable raw materials, at this stage the market in the soundproof goods are varied, soundproof raw materials are very important, and sound insulation effect, environmental protection, and even physical and mental health are quite related.